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  • Bug fixes for general core bugs in 3.11.x will end 14 Nov 2022 (12 months plus 6 months extension).
  • Bug fixes for security issues in 3.11.x will end 13 Nov 2023 (18 months plus 12 months extension).
  • PHP version: minimum PHP 7.3.0 Note: minimum PHP version has increased since Moodle 3.10. PHP 7.4.x is supported too.
  • /grade/ -> lib.php (source)

    Differences Between: [Versions 310 and 311] [Versions 311 and 400] [Versions 37 and 311] [Versions 38 and 311] [Versions 39 and 311]

       1  <?php
       2  // This file is part of Moodle - http://moodle.org/
       3  //
       4  // Moodle is free software: you can redistribute it and/or modify
       5  // it under the terms of the GNU General Public License as published by
       6  // the Free Software Foundation, either version 3 of the License, or
       7  // (at your option) any later version.
       8  //
       9  // Moodle is distributed in the hope that it will be useful,
      10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
      11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12  // GNU General Public License for more details.
      13  //
      14  // You should have received a copy of the GNU General Public License
      15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
      16  
      17  /**
      18   * Functions used by gradebook plugins and reports.
      19   *
      20   * @package   core_grades
      21   * @copyright 2009 Petr Skoda and Nicolas Connault
      22   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
      23   */
      24  
      25  require_once($CFG->libdir . '/gradelib.php');
      26  require_once($CFG->dirroot . '/grade/export/lib.php');
      27  
      28  /**
      29   * This class iterates over all users that are graded in a course.
      30   * Returns detailed info about users and their grades.
      31   *
      32   * @author Petr Skoda <skodak@moodle.org>
      33   * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
      34   */
      35  class graded_users_iterator {
      36  
      37      /**
      38       * The couse whose users we are interested in
      39       */
      40      protected $course;
      41  
      42      /**
      43       * An array of grade items or null if only user data was requested
      44       */
      45      protected $grade_items;
      46  
      47      /**
      48       * The group ID we are interested in. 0 means all groups.
      49       */
      50      protected $groupid;
      51  
      52      /**
      53       * A recordset of graded users
      54       */
      55      protected $users_rs;
      56  
      57      /**
      58       * A recordset of user grades (grade_grade instances)
      59       */
      60      protected $grades_rs;
      61  
      62      /**
      63       * Array used when moving to next user while iterating through the grades recordset
      64       */
      65      protected $gradestack;
      66  
      67      /**
      68       * The first field of the users table by which the array of users will be sorted
      69       */
      70      protected $sortfield1;
      71  
      72      /**
      73       * Should sortfield1 be ASC or DESC
      74       */
      75      protected $sortorder1;
      76  
      77      /**
      78       * The second field of the users table by which the array of users will be sorted
      79       */
      80      protected $sortfield2;
      81  
      82      /**
      83       * Should sortfield2 be ASC or DESC
      84       */
      85      protected $sortorder2;
      86  
      87      /**
      88       * Should users whose enrolment has been suspended be ignored?
      89       */
      90      protected $onlyactive = false;
      91  
      92      /**
      93       * Enable user custom fields
      94       */
      95      protected $allowusercustomfields = false;
      96  
      97      /**
      98       * List of suspended users in course. This includes users whose enrolment status is suspended
      99       * or enrolment has expired or not started.
     100       */
     101      protected $suspendedusers = array();
     102  
     103      /**
     104       * Constructor
     105       *
     106       * @param object $course A course object
     107       * @param array  $grade_items array of grade items, if not specified only user info returned
     108       * @param int    $groupid iterate only group users if present
     109       * @param string $sortfield1 The first field of the users table by which the array of users will be sorted
     110       * @param string $sortorder1 The order in which the first sorting field will be sorted (ASC or DESC)
     111       * @param string $sortfield2 The second field of the users table by which the array of users will be sorted
     112       * @param string $sortorder2 The order in which the second sorting field will be sorted (ASC or DESC)
     113       */
     114      public function __construct($course, $grade_items=null, $groupid=0,
     115                                            $sortfield1='lastname', $sortorder1='ASC',
     116                                            $sortfield2='firstname', $sortorder2='ASC') {
     117          $this->course      = $course;
     118          $this->grade_items = $grade_items;
     119          $this->groupid     = $groupid;
     120          $this->sortfield1  = $sortfield1;
     121          $this->sortorder1  = $sortorder1;
     122          $this->sortfield2  = $sortfield2;
     123          $this->sortorder2  = $sortorder2;
     124  
     125          $this->gradestack  = array();
     126      }
     127  
     128      /**
     129       * Initialise the iterator
     130       *
     131       * @return boolean success
     132       */
     133      public function init() {
     134          global $CFG, $DB;
     135  
     136          $this->close();
     137  
     138          export_verify_grades($this->course->id);
     139          $course_item = grade_item::fetch_course_item($this->course->id);
     140          if ($course_item->needsupdate) {
     141              // Can not calculate all final grades - sorry.
     142              return false;
     143          }
     144  
     145          $coursecontext = context_course::instance($this->course->id);
     146  
     147          list($relatedctxsql, $relatedctxparams) = $DB->get_in_or_equal($coursecontext->get_parent_context_ids(true), SQL_PARAMS_NAMED, 'relatedctx');
     148          list($gradebookroles_sql, $params) = $DB->get_in_or_equal(explode(',', $CFG->gradebookroles), SQL_PARAMS_NAMED, 'grbr');
     149          list($enrolledsql, $enrolledparams) = get_enrolled_sql($coursecontext, '', 0, $this->onlyactive);
     150  
     151          $params = array_merge($params, $enrolledparams, $relatedctxparams);
     152  
     153          if ($this->groupid) {
     154              $groupsql = "INNER JOIN {groups_members} gm ON gm.userid = u.id";
     155              $groupwheresql = "AND gm.groupid = :groupid";
     156              // $params contents: gradebookroles
     157              $params['groupid'] = $this->groupid;
     158          } else {
     159              $groupsql = "";
     160              $groupwheresql = "";
     161          }
     162  
     163          if (empty($this->sortfield1)) {
     164              // We must do some sorting even if not specified.
     165              $ofields = ", u.id AS usrt";
     166              $order   = "usrt ASC";
     167  
     168          } else {
     169              $ofields = ", u.$this->sortfield1 AS usrt1";
     170              $order   = "usrt1 $this->sortorder1";
     171              if (!empty($this->sortfield2)) {
     172                  $ofields .= ", u.$this->sortfield2 AS usrt2";
     173                  $order   .= ", usrt2 $this->sortorder2";
     174              }
     175              if ($this->sortfield1 != 'id' and $this->sortfield2 != 'id') {
     176                  // User order MUST be the same in both queries,
     177                  // must include the only unique user->id if not already present.
     178                  $ofields .= ", u.id AS usrt";
     179                  $order   .= ", usrt ASC";
     180              }
     181          }
     182  
     183          $userfields = 'u.*';
     184          $customfieldssql = '';
     185          if ($this->allowusercustomfields && !empty($CFG->grade_export_customprofilefields)) {
     186              $customfieldscount = 0;
     187              $customfieldsarray = grade_helper::get_user_profile_fields($this->course->id, $this->allowusercustomfields);
     188              foreach ($customfieldsarray as $field) {
     189                  if (!empty($field->customid)) {
     190                      $customfieldssql .= "
     191                              LEFT JOIN (SELECT * FROM {user_info_data}
     192                                  WHERE fieldid = :cf$customfieldscount) cf$customfieldscount
     193                              ON u.id = cf$customfieldscount.userid";
     194                      $userfields .= ", cf$customfieldscount.data AS customfield_{$field->customid}";
     195                      $params['cf'.$customfieldscount] = $field->customid;
     196                      $customfieldscount++;
     197                  }
     198              }
     199          }
     200  
     201          $users_sql = "SELECT $userfields $ofields
     202                          FROM {user} u
     203                          JOIN ($enrolledsql) je ON je.id = u.id
     204                               $groupsql $customfieldssql
     205                          JOIN (
     206                                    SELECT DISTINCT ra.userid
     207                                      FROM {role_assignments} ra
     208                                     WHERE ra.roleid $gradebookroles_sql
     209                                       AND ra.contextid $relatedctxsql
     210                               ) rainner ON rainner.userid = u.id
     211                           WHERE u.deleted = 0
     212                               $groupwheresql
     213                      ORDER BY $order";
     214          $this->users_rs = $DB->get_recordset_sql($users_sql, $params);
     215  
     216          if (!$this->onlyactive) {
     217              $context = context_course::instance($this->course->id);
     218              $this->suspendedusers = get_suspended_userids($context);
     219          } else {
     220              $this->suspendedusers = array();
     221          }
     222  
     223          if (!empty($this->grade_items)) {
     224              $itemids = array_keys($this->grade_items);
     225              list($itemidsql, $grades_params) = $DB->get_in_or_equal($itemids, SQL_PARAMS_NAMED, 'items');
     226              $params = array_merge($params, $grades_params);
     227  
     228              $grades_sql = "SELECT g.* $ofields
     229                               FROM {grade_grades} g
     230                               JOIN {user} u ON g.userid = u.id
     231                               JOIN ($enrolledsql) je ON je.id = u.id
     232                                    $groupsql
     233                               JOIN (
     234                                        SELECT DISTINCT ra.userid
     235                                          FROM {role_assignments} ra
     236                                         WHERE ra.roleid $gradebookroles_sql
     237                                           AND ra.contextid $relatedctxsql
     238                                    ) rainner ON rainner.userid = u.id
     239                                WHERE u.deleted = 0
     240                                AND g.itemid $itemidsql
     241                                $groupwheresql
     242                           ORDER BY $order, g.itemid ASC";
     243              $this->grades_rs = $DB->get_recordset_sql($grades_sql, $params);
     244          } else {
     245              $this->grades_rs = false;
     246          }
     247  
     248          return true;
     249      }
     250  
     251      /**
     252       * Returns information about the next user
     253       * @return mixed array of user info, all grades and feedback or null when no more users found
     254       */
     255      public function next_user() {
     256          if (!$this->users_rs) {
     257              return false; // no users present
     258          }
     259  
     260          if (!$this->users_rs->valid()) {
     261              if ($current = $this->_pop()) {
     262                  // this is not good - user or grades updated between the two reads above :-(
     263              }
     264  
     265              return false; // no more users
     266          } else {
     267              $user = $this->users_rs->current();
     268              $this->users_rs->next();
     269          }
     270  
     271          // find grades of this user
     272          $grade_records = array();
     273          while (true) {
     274              if (!$current = $this->_pop()) {
     275                  break; // no more grades
     276              }
     277  
     278              if (empty($current->userid)) {
     279                  break;
     280              }
     281  
     282              if ($current->userid != $user->id) {
     283                  // grade of the next user, we have all for this user
     284                  $this->_push($current);
     285                  break;
     286              }
     287  
     288              $grade_records[$current->itemid] = $current;
     289          }
     290  
     291          $grades = array();
     292          $feedbacks = array();
     293  
     294          if (!empty($this->grade_items)) {
     295              foreach ($this->grade_items as $grade_item) {
     296                  if (!isset($feedbacks[$grade_item->id])) {
     297                      $feedbacks[$grade_item->id] = new stdClass();
     298                  }
     299                  if (array_key_exists($grade_item->id, $grade_records)) {
     300                      $feedbacks[$grade_item->id]->feedback       = $grade_records[$grade_item->id]->feedback;
     301                      $feedbacks[$grade_item->id]->feedbackformat = $grade_records[$grade_item->id]->feedbackformat;
     302                      unset($grade_records[$grade_item->id]->feedback);
     303                      unset($grade_records[$grade_item->id]->feedbackformat);
     304                      $grades[$grade_item->id] = new grade_grade($grade_records[$grade_item->id], false);
     305                  } else {
     306                      $feedbacks[$grade_item->id]->feedback       = '';
     307                      $feedbacks[$grade_item->id]->feedbackformat = FORMAT_MOODLE;
     308                      $grades[$grade_item->id] =
     309                          new grade_grade(array('userid'=>$user->id, 'itemid'=>$grade_item->id), false);
     310                  }
     311                  $grades[$grade_item->id]->grade_item = $grade_item;
     312              }
     313          }
     314  
     315          // Set user suspended status.
     316          $user->suspendedenrolment = isset($this->suspendedusers[$user->id]);
     317          $result = new stdClass();
     318          $result->user      = $user;
     319          $result->grades    = $grades;
     320          $result->feedbacks = $feedbacks;
     321          return $result;
     322      }
     323  
     324      /**
     325       * Close the iterator, do not forget to call this function
     326       */
     327      public function close() {
     328          if ($this->users_rs) {
     329              $this->users_rs->close();
     330              $this->users_rs = null;
     331          }
     332          if ($this->grades_rs) {
     333              $this->grades_rs->close();
     334              $this->grades_rs = null;
     335          }
     336          $this->gradestack = array();
     337      }
     338  
     339      /**
     340       * Should all enrolled users be exported or just those with an active enrolment?
     341       *
     342       * @param bool $onlyactive True to limit the export to users with an active enrolment
     343       */
     344      public function require_active_enrolment($onlyactive = true) {
     345          if (!empty($this->users_rs)) {
     346              debugging('Calling require_active_enrolment() has no effect unless you call init() again', DEBUG_DEVELOPER);
     347          }
     348          $this->onlyactive  = $onlyactive;
     349      }
     350  
     351      /**
     352       * Allow custom fields to be included
     353       *
     354       * @param bool $allow Whether to allow custom fields or not
     355       * @return void
     356       */
     357      public function allow_user_custom_fields($allow = true) {
     358          if ($allow) {
     359              $this->allowusercustomfields = true;
     360          } else {
     361              $this->allowusercustomfields = false;
     362          }
     363      }
     364  
     365      /**
     366       * Add a grade_grade instance to the grade stack
     367       *
     368       * @param grade_grade $grade Grade object
     369       *
     370       * @return void
     371       */
     372      private function _push($grade) {
     373          array_push($this->gradestack, $grade);
     374      }
     375  
     376  
     377      /**
     378       * Remove a grade_grade instance from the grade stack
     379       *
     380       * @return grade_grade current grade object
     381       */
     382      private function _pop() {
     383          global $DB;
     384          if (empty($this->gradestack)) {
     385              if (empty($this->grades_rs) || !$this->grades_rs->valid()) {
     386                  return null; // no grades present
     387              }
     388  
     389              $current = $this->grades_rs->current();
     390  
     391              $this->grades_rs->next();
     392  
     393              return $current;
     394          } else {
     395              return array_pop($this->gradestack);
     396          }
     397      }
     398  }
     399  
     400  /**
     401   * Print a selection popup form of the graded users in a course.
     402   *
     403   * @deprecated since 2.0
     404   *
     405   * @param int    $course id of the course
     406   * @param string $actionpage The page receiving the data from the popoup form
     407   * @param int    $userid   id of the currently selected user (or 'all' if they are all selected)
     408   * @param int    $groupid id of requested group, 0 means all
     409   * @param int    $includeall bool include all option
     410   * @param bool   $return If true, will return the HTML, otherwise, will print directly
     411   * @return null
     412   */
     413  function print_graded_users_selector($course, $actionpage, $userid=0, $groupid=0, $includeall=true, $return=false) {
     414      global $CFG, $USER, $OUTPUT;
     415      return $OUTPUT->render(grade_get_graded_users_select(substr($actionpage, 0, strpos($actionpage, '/')), $course, $userid, $groupid, $includeall));
     416  }
     417  
     418  function grade_get_graded_users_select($report, $course, $userid, $groupid, $includeall) {
     419      global $USER, $CFG;
     420  
     421      if (is_null($userid)) {
     422          $userid = $USER->id;
     423      }
     424      $coursecontext = context_course::instance($course->id);
     425      $defaultgradeshowactiveenrol = !empty($CFG->grade_report_showonlyactiveenrol);
     426      $showonlyactiveenrol = get_user_preferences('grade_report_showonlyactiveenrol', $defaultgradeshowactiveenrol);
     427      $showonlyactiveenrol = $showonlyactiveenrol || !has_capability('moodle/course:viewsuspendedusers', $coursecontext);
     428      $menu = array(); // Will be a list of userid => user name
     429      $menususpendedusers = array(); // Suspended users go to a separate optgroup.
     430      $gui = new graded_users_iterator($course, null, $groupid);
     431      $gui->require_active_enrolment($showonlyactiveenrol);
     432      $gui->init();
     433      $label = get_string('selectauser', 'grades');
     434      if ($includeall) {
     435          $menu[0] = get_string('allusers', 'grades');
     436          $label = get_string('selectalloroneuser', 'grades');
     437      }
     438      while ($userdata = $gui->next_user()) {
     439          $user = $userdata->user;
     440          $userfullname = fullname($user);
     441          if ($user->suspendedenrolment) {
     442              $menususpendedusers[$user->id] = $userfullname;
     443          } else {
     444              $menu[$user->id] = $userfullname;
     445          }
     446      }
     447      $gui->close();
     448  
     449      if ($includeall) {
     450          $menu[0] .= " (" . (count($menu) + count($menususpendedusers) - 1) . ")";
     451      }
     452  
     453      if (!empty($menususpendedusers)) {
     454          $menu[] = array(get_string('suspendedusers') => $menususpendedusers);
     455      }
     456      $gpr = new grade_plugin_return(array('type' => 'report', 'course' => $course, 'groupid' => $groupid));
     457      $select = new single_select(
     458          new moodle_url('/grade/report/'.$report.'/index.php', $gpr->get_options()),
     459          'userid', $menu, $userid
     460      );
     461      $select->label = $label;
     462      $select->formid = 'choosegradeuser';
     463      return $select;
     464  }
     465  
     466  /**
     467   * Hide warning about changed grades during upgrade to 2.8.
     468   *
     469   * @param int $courseid The current course id.
     470   */
     471  function hide_natural_aggregation_upgrade_notice($courseid) {
     472      unset_config('show_sumofgrades_upgrade_' . $courseid);
     473  }
     474  
     475  /**
     476   * Hide warning about changed grades during upgrade from 2.8.0-2.8.6 and 2.9.0.
     477   *
     478   * @param int $courseid The current course id.
     479   */
     480  function grade_hide_min_max_grade_upgrade_notice($courseid) {
     481      unset_config('show_min_max_grades_changed_' . $courseid);
     482  }
     483  
     484  /**
     485   * Use the grade min and max from the grade_grade.
     486   *
     487   * This is reserved for core use after an upgrade.
     488   *
     489   * @param int $courseid The current course id.
     490   */
     491  function grade_upgrade_use_min_max_from_grade_grade($courseid) {
     492      grade_set_setting($courseid, 'minmaxtouse', GRADE_MIN_MAX_FROM_GRADE_GRADE);
     493  
     494      grade_force_full_regrading($courseid);
     495      // Do this now, because it probably happened to late in the page load to be happen automatically.
     496      grade_regrade_final_grades($courseid);
     497  }
     498  
     499  /**
     500   * Use the grade min and max from the grade_item.
     501   *
     502   * This is reserved for core use after an upgrade.
     503   *
     504   * @param int $courseid The current course id.
     505   */
     506  function grade_upgrade_use_min_max_from_grade_item($courseid) {
     507      grade_set_setting($courseid, 'minmaxtouse', GRADE_MIN_MAX_FROM_GRADE_ITEM);
     508  
     509      grade_force_full_regrading($courseid);
     510      // Do this now, because it probably happened to late in the page load to be happen automatically.
     511      grade_regrade_final_grades($courseid);
     512  }
     513  
     514  /**
     515   * Hide warning about changed grades during upgrade to 2.8.
     516   *
     517   * @param int $courseid The current course id.
     518   */
     519  function hide_aggregatesubcats_upgrade_notice($courseid) {
     520      unset_config('show_aggregatesubcats_upgrade_' . $courseid);
     521  }
     522  
     523  /**
     524   * Hide warning about changed grades due to bug fixes
     525   *
     526   * @param int $courseid The current course id.
     527   */
     528  function hide_gradebook_calculations_freeze_notice($courseid) {
     529      unset_config('gradebook_calculations_freeze_' . $courseid);
     530  }
     531  
     532  /**
     533   * Print warning about changed grades during upgrade to 2.8.
     534   *
     535   * @param int $courseid The current course id.
     536   * @param context $context The course context.
     537   * @param string $thispage The relative path for the current page. E.g. /grade/report/user/index.php
     538   * @param boolean $return return as string
     539   *
     540   * @return nothing or string if $return true
     541   */
     542  function print_natural_aggregation_upgrade_notice($courseid, $context, $thispage, $return=false) {
     543      global $CFG, $OUTPUT;
     544      $html = '';
     545  
     546      // Do not do anything if they cannot manage the grades of this course.
     547      if (!has_capability('moodle/grade:manage', $context)) {
     548          return $html;
     549      }
     550  
     551      $hidesubcatswarning = optional_param('seenaggregatesubcatsupgradedgrades', false, PARAM_BOOL) && confirm_sesskey();
     552      $showsubcatswarning = get_config('core', 'show_aggregatesubcats_upgrade_' . $courseid);
     553      $hidenaturalwarning = optional_param('seensumofgradesupgradedgrades', false, PARAM_BOOL) && confirm_sesskey();
     554      $shownaturalwarning = get_config('core', 'show_sumofgrades_upgrade_' . $courseid);
     555  
     556      $hideminmaxwarning = optional_param('seenminmaxupgradedgrades', false, PARAM_BOOL) && confirm_sesskey();
     557      $showminmaxwarning = get_config('core', 'show_min_max_grades_changed_' . $courseid);
     558  
     559      $useminmaxfromgradeitem = optional_param('useminmaxfromgradeitem', false, PARAM_BOOL) && confirm_sesskey();
     560      $useminmaxfromgradegrade = optional_param('useminmaxfromgradegrade', false, PARAM_BOOL) && confirm_sesskey();
     561  
     562      $minmaxtouse = grade_get_setting($courseid, 'minmaxtouse', $CFG->grade_minmaxtouse);
     563  
     564      $gradebookcalculationsfreeze = get_config('core', 'gradebook_calculations_freeze_' . $courseid);
     565      $acceptgradebookchanges = optional_param('acceptgradebookchanges', false, PARAM_BOOL) && confirm_sesskey();
     566  
     567      // Hide the warning if the user told it to go away.
     568      if ($hidenaturalwarning) {
     569          hide_natural_aggregation_upgrade_notice($courseid);
     570      }
     571      // Hide the warning if the user told it to go away.
     572      if ($hidesubcatswarning) {
     573          hide_aggregatesubcats_upgrade_notice($courseid);
     574      }
     575  
     576      // Hide the min/max warning if the user told it to go away.
     577      if ($hideminmaxwarning) {
     578          grade_hide_min_max_grade_upgrade_notice($courseid);
     579          $showminmaxwarning = false;
     580      }
     581  
     582      if ($useminmaxfromgradegrade) {
     583          // Revert to the new behaviour, we now use the grade_grade for min/max.
     584          grade_upgrade_use_min_max_from_grade_grade($courseid);
     585          grade_hide_min_max_grade_upgrade_notice($courseid);
     586          $showminmaxwarning = false;
     587  
     588      } else if ($useminmaxfromgradeitem) {
     589          // Apply the new logic, we now use the grade_item for min/max.
     590          grade_upgrade_use_min_max_from_grade_item($courseid);
     591          grade_hide_min_max_grade_upgrade_notice($courseid);
     592          $showminmaxwarning = false;
     593      }
     594  
     595  
     596      if (!$hidenaturalwarning && $shownaturalwarning) {
     597          $message = get_string('sumofgradesupgradedgrades', 'grades');
     598          $hidemessage = get_string('upgradedgradeshidemessage', 'grades');
     599          $urlparams = array( 'id' => $courseid,
     600                              'seensumofgradesupgradedgrades' => true,
     601                              'sesskey' => sesskey());
     602          $goawayurl = new moodle_url($thispage, $urlparams);
     603          $goawaybutton = $OUTPUT->single_button($goawayurl, $hidemessage, 'get');
     604          $html .= $OUTPUT->notification($message, 'notifysuccess');
     605          $html .= $goawaybutton;
     606      }
     607  
     608      if (!$hidesubcatswarning && $showsubcatswarning) {
     609          $message = get_string('aggregatesubcatsupgradedgrades', 'grades');
     610          $hidemessage = get_string('upgradedgradeshidemessage', 'grades');
     611          $urlparams = array( 'id' => $courseid,
     612                              'seenaggregatesubcatsupgradedgrades' => true,
     613                              'sesskey' => sesskey());
     614          $goawayurl = new moodle_url($thispage, $urlparams);
     615          $goawaybutton = $OUTPUT->single_button($goawayurl, $hidemessage, 'get');
     616          $html .= $OUTPUT->notification($message, 'notifysuccess');
     617          $html .= $goawaybutton;
     618      }
     619  
     620      if ($showminmaxwarning) {
     621          $hidemessage = get_string('upgradedgradeshidemessage', 'grades');
     622          $urlparams = array( 'id' => $courseid,
     623                              'seenminmaxupgradedgrades' => true,
     624                              'sesskey' => sesskey());
     625  
     626          $goawayurl = new moodle_url($thispage, $urlparams);
     627          $hideminmaxbutton = $OUTPUT->single_button($goawayurl, $hidemessage, 'get');
     628          $moreinfo = html_writer::link(get_docs_url(get_string('minmaxtouse_link', 'grades')), get_string('moreinfo'),
     629              array('target' => '_blank'));
     630  
     631          if ($minmaxtouse == GRADE_MIN_MAX_FROM_GRADE_ITEM) {
     632              // Show the message that there were min/max issues that have been resolved.
     633              $message = get_string('minmaxupgradedgrades', 'grades') . ' ' . $moreinfo;
     634  
     635              $revertmessage = get_string('upgradedminmaxrevertmessage', 'grades');
     636              $urlparams = array('id' => $courseid,
     637                                 'useminmaxfromgradegrade' => true,
     638                                 'sesskey' => sesskey());
     639              $reverturl = new moodle_url($thispage, $urlparams);
     640              $revertbutton = $OUTPUT->single_button($reverturl, $revertmessage, 'get');
     641  
     642              $html .= $OUTPUT->notification($message);
     643              $html .= $revertbutton . $hideminmaxbutton;
     644  
     645          } else if ($minmaxtouse == GRADE_MIN_MAX_FROM_GRADE_GRADE) {
     646              // Show the warning that there are min/max issues that have not be resolved.
     647              $message = get_string('minmaxupgradewarning', 'grades') . ' ' . $moreinfo;
     648  
     649              $fixmessage = get_string('minmaxupgradefixbutton', 'grades');
     650              $urlparams = array('id' => $courseid,
     651                                 'useminmaxfromgradeitem' => true,
     652                                 'sesskey' => sesskey());
     653              $fixurl = new moodle_url($thispage, $urlparams);
     654              $fixbutton = $OUTPUT->single_button($fixurl, $fixmessage, 'get');
     655  
     656              $html .= $OUTPUT->notification($message);
     657              $html .= $fixbutton . $hideminmaxbutton;
     658          }
     659      }
     660  
     661      if ($gradebookcalculationsfreeze) {
     662          if ($acceptgradebookchanges) {
     663              // Accept potential changes in grades caused by extra credit bug MDL-49257.
     664              hide_gradebook_calculations_freeze_notice($courseid);
     665              $courseitem = grade_item::fetch_course_item($courseid);
     666              $courseitem->force_regrading();
     667              grade_regrade_final_grades($courseid);
     668  
     669              $html .= $OUTPUT->notification(get_string('gradebookcalculationsuptodate', 'grades'), 'notifysuccess');
     670          } else {
     671              // Show the warning that there may be extra credit weights problems.
     672              $a = new stdClass();
     673              $a->gradebookversion = $gradebookcalculationsfreeze;
     674              if (preg_match('/(\d{8,})/', $CFG->release, $matches)) {
     675                  $a->currentversion = $matches[1];
     676              } else {
     677                  $a->currentversion = $CFG->release;
     678              }
     679              $a->url = get_docs_url('Gradebook_calculation_changes');
     680              $message = get_string('gradebookcalculationswarning', 'grades', $a);
     681  
     682              $fixmessage = get_string('gradebookcalculationsfixbutton', 'grades');
     683              $urlparams = array('id' => $courseid,
     684                  'acceptgradebookchanges' => true,
     685                  'sesskey' => sesskey());
     686              $fixurl = new moodle_url($thispage, $urlparams);
     687              $fixbutton = $OUTPUT->single_button($fixurl, $fixmessage, 'get');
     688  
     689              $html .= $OUTPUT->notification($message);
     690              $html .= $fixbutton;
     691          }
     692      }
     693  
     694      if (!empty($html)) {
     695          $html = html_writer::tag('div', $html, array('class' => 'core_grades_notices'));
     696      }
     697  
     698      if ($return) {
     699          return $html;
     700      } else {
     701          echo $html;
     702      }
     703  }
     704  
     705  /**
     706   * Print grading plugin selection popup form.
     707   *
     708   * @param array   $plugin_info An array of plugins containing information for the selector
     709   * @param boolean $return return as string
     710   *
     711   * @return nothing or string if $return true
     712   */
     713  function print_grade_plugin_selector($plugin_info, $active_type, $active_plugin, $return=false) {
     714      global $CFG, $OUTPUT, $PAGE;
     715  
     716      $menu = array();
     717      $count = 0;
     718      $active = '';
     719  
     720      foreach ($plugin_info as $plugin_type => $plugins) {
     721          if ($plugin_type == 'strings') {
     722              continue;
     723          }
     724  
     725          $first_plugin = reset($plugins);
     726  
     727          $sectionname = $plugin_info['strings'][$plugin_type];
     728          $section = array();
     729  
     730          foreach ($plugins as $plugin) {
     731              $link = $plugin->link->out(false);
     732              $section[$link] = $plugin->string;
     733              $count++;
     734              if ($plugin_type === $active_type and $plugin->id === $active_plugin) {
     735                  $active = $link;
     736              }
     737          }
     738  
     739          if ($section) {
     740              $menu[] = array($sectionname=>$section);
     741          }
     742      }
     743  
     744      // finally print/return the popup form
     745      if ($count > 1) {
     746          $select = new url_select($menu, $active, null, 'choosepluginreport');
     747          $select->set_label(get_string('gradereport', 'grades'), array('class' => 'accesshide'));
     748          if ($return) {
     749              return $OUTPUT->render($select);
     750          } else {
     751              echo $OUTPUT->render($select);
     752          }
     753      } else {
     754          // only one option - no plugin selector needed
     755          return '';
     756      }
     757  }
     758  
     759  /**
     760   * Print grading plugin selection tab-based navigation.
     761   *
     762   * @param string  $active_type type of plugin on current page - import, export, report or edit
     763   * @param string  $active_plugin active plugin type - grader, user, cvs, ...
     764   * @param array   $plugin_info Array of plugins
     765   * @param boolean $return return as string
     766   *
     767   * @return nothing or string if $return true
     768   */
     769  function grade_print_tabs($active_type, $active_plugin, $plugin_info, $return=false) {
     770      global $CFG, $COURSE;
     771  
     772      if (!isset($currenttab)) { //TODO: this is weird
     773          $currenttab = '';
     774      }
     775  
     776      $tabs = array();
     777      $top_row  = array();
     778      $bottom_row = array();
     779      $inactive = array($active_plugin);
     780      $activated = array($active_type);
     781  
     782      $count = 0;
     783      $active = '';
     784  
     785      foreach ($plugin_info as $plugin_type => $plugins) {
     786          if ($plugin_type == 'strings') {
     787              continue;
     788          }
     789  
     790          // If $plugins is actually the definition of a child-less parent link:
     791          if (!empty($plugins->id)) {
     792              $string = $plugins->string;
     793              if (!empty($plugin_info[$active_type]->parent)) {
     794                  $string = $plugin_info[$active_type]->parent->string;
     795              }
     796  
     797              $top_row[] = new tabobject($plugin_type, $plugins->link, $string);
     798              continue;
     799          }
     800  
     801          $first_plugin = reset($plugins);
     802          $url = $first_plugin->link;
     803  
     804          if ($plugin_type == 'report') {
     805              $url = $CFG->wwwroot.'/grade/report/index.php?id='.$COURSE->id;
     806          }
     807  
     808          $top_row[] = new tabobject($plugin_type, $url, $plugin_info['strings'][$plugin_type]);
     809  
     810          if ($active_type == $plugin_type) {
     811              foreach ($plugins as $plugin) {
     812                  $bottom_row[] = new tabobject($plugin->id, $plugin->link, $plugin->string);
     813                  if ($plugin->id == $active_plugin) {
     814                      $inactive = array($plugin->id);
     815                  }
     816              }
     817          }
     818      }
     819  
     820      // Do not display rows that contain only one item, they are not helpful.
     821      if (count($top_row) > 1) {
     822          $tabs[] = $top_row;
     823      }
     824      if (count($bottom_row) > 1) {
     825          $tabs[] = $bottom_row;
     826      }
     827      if (empty($tabs)) {
     828          return;
     829      }
     830  
     831      $rv = html_writer::div(print_tabs($tabs, $active_plugin, $inactive, $activated, true), 'grade-navigation');
     832  
     833      if ($return) {
     834          return $rv;
     835      } else {
     836          echo $rv;
     837      }
     838  }
     839  
     840  /**
     841   * grade_get_plugin_info
     842   *
     843   * @param int    $courseid The course id
     844   * @param string $active_type type of plugin on current page - import, export, report or edit
     845   * @param string $active_plugin active plugin type - grader, user, cvs, ...
     846   *
     847   * @return array
     848   */
     849  function grade_get_plugin_info($courseid, $active_type, $active_plugin) {
     850      global $CFG, $SITE;
     851  
     852      $context = context_course::instance($courseid);
     853  
     854      $plugin_info = array();
     855      $count = 0;
     856      $active = '';
     857      $url_prefix = $CFG->wwwroot . '/grade/';
     858  
     859      // Language strings
     860      $plugin_info['strings'] = grade_helper::get_plugin_strings();
     861  
     862      if ($reports = grade_helper::get_plugins_reports($courseid)) {
     863          $plugin_info['report'] = $reports;
     864      }
     865  
     866      if ($settings = grade_helper::get_info_manage_settings($courseid)) {
     867          $plugin_info['settings'] = $settings;
     868      }
     869  
     870      if ($scale = grade_helper::get_info_scales($courseid)) {
     871          $plugin_info['scale'] = array('view'=>$scale);
     872      }
     873  
     874      if ($outcomes = grade_helper::get_info_outcomes($courseid)) {
     875          $plugin_info['outcome'] = $outcomes;
     876      }
     877  
     878      if ($letters = grade_helper::get_info_letters($courseid)) {
     879          $plugin_info['letter'] = $letters;
     880      }
     881  
     882      if ($imports = grade_helper::get_plugins_import($courseid)) {
     883          $plugin_info['import'] = $imports;
     884      }
     885  
     886      if ($exports = grade_helper::get_plugins_export($courseid)) {
     887          $plugin_info['export'] = $exports;
     888      }
     889  
     890      foreach ($plugin_info as $plugin_type => $plugins) {
     891          if (!empty($plugins->id) && $active_plugin == $plugins->id) {
     892              $plugin_info['strings']['active_plugin_str'] = $plugins->string;
     893              break;
     894          }
     895          foreach ($plugins as $plugin) {
     896              if (is_a($plugin, 'grade_plugin_info')) {
     897                  if ($active_plugin == $plugin->id) {
     898                      $plugin_info['strings']['active_plugin_str'] = $plugin->string;
     899                  }
     900              }
     901          }
     902      }
     903  
     904      return $plugin_info;
     905  }
     906  
     907  /**
     908   * A simple class containing info about grade plugins.
     909   * Can be subclassed for special rules
     910   *
     911   * @package core_grades
     912   * @copyright 2009 Nicolas Connault
     913   * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
     914   */
     915  class grade_plugin_info {
     916      /**
     917       * A unique id for this plugin
     918       *
     919       * @var mixed
     920       */
     921      public $id;
     922      /**
     923       * A URL to access this plugin
     924       *
     925       * @var mixed
     926       */
     927      public $link;
     928      /**
     929       * The name of this plugin
     930       *
     931       * @var mixed
     932       */
     933      public $string;
     934      /**
     935       * Another grade_plugin_info object, parent of the current one
     936       *
     937       * @var mixed
     938       */
     939      public $parent;
     940  
     941      /**
     942       * Constructor
     943       *
     944       * @param int $id A unique id for this plugin
     945       * @param string $link A URL to access this plugin
     946       * @param string $string The name of this plugin
     947       * @param object $parent Another grade_plugin_info object, parent of the current one
     948       *
     949       * @return void
     950       */
     951      public function __construct($id, $link, $string, $parent=null) {
     952          $this->id = $id;
     953          $this->link = $link;
     954          $this->string = $string;
     955          $this->parent = $parent;
     956      }
     957  }
     958  
     959  /**
     960   * Prints the page headers, breadcrumb trail, page heading, (optional) dropdown navigation menu and
     961   * (optional) navigation tabs for any gradebook page. All gradebook pages MUST use these functions
     962   * in favour of the usual print_header(), print_header_simple(), print_heading() etc.
     963   * !IMPORTANT! Use of tabs.php file in gradebook pages is forbidden unless tabs are switched off at
     964   * the site level for the gradebook ($CFG->grade_navmethod = GRADE_NAVMETHOD_DROPDOWN).
     965   *
     966   * @param int     $courseid Course id
     967   * @param string  $active_type The type of the current page (report, settings,
     968   *                             import, export, scales, outcomes, letters)
     969   * @param string  $active_plugin The plugin of the current page (grader, fullview etc...)
     970   * @param string  $heading The heading of the page. Tries to guess if none is given
     971   * @param boolean $return Whether to return (true) or echo (false) the HTML generated by this function
     972   * @param string  $bodytags Additional attributes that will be added to the <body> tag
     973   * @param string  $buttons Additional buttons to display on the page
     974   * @param boolean $shownavigation should the gradebook navigation drop down (or tabs) be shown?
     975   * @param string  $headerhelpidentifier The help string identifier if required.
     976   * @param string  $headerhelpcomponent The component for the help string.
     977   * @param stdClass $user The user object for use with the user context header.
     978   *
     979   * @return string HTML code or nothing if $return == false
     980   */
     981  function print_grade_page_head($courseid, $active_type, $active_plugin=null,
     982                                 $heading = false, $return=false,
     983                                 $buttons=false, $shownavigation=true, $headerhelpidentifier = null, $headerhelpcomponent = null,
     984                                 $user = null) {
     985      global $CFG, $OUTPUT, $PAGE;
     986  
     987      // Put a warning on all gradebook pages if the course has modules currently scheduled for background deletion.
     988      require_once($CFG->dirroot . '/course/lib.php');
     989      if (course_modules_pending_deletion($courseid, true)) {
     990          \core\notification::add(get_string('gradesmoduledeletionpendingwarning', 'grades'),
     991              \core\output\notification::NOTIFY_WARNING);
     992      }
     993  
     994      if ($active_type === 'preferences') {
     995          // In Moodle 2.8 report preferences were moved under 'settings'. Allow backward compatibility for 3rd party grade reports.
     996          $active_type = 'settings';
     997      }
     998  
     999      $plugin_info = grade_get_plugin_info($courseid, $active_type, $active_plugin);
    1000  
    1001      // Determine the string of the active plugin
    1002      $stractive_plugin = ($active_plugin) ? $plugin_info['strings']['active_plugin_str'] : $heading;
    1003      $stractive_type = $plugin_info['strings'][$active_type];
    1004  
    1005      if (empty($plugin_info[$active_type]->id) || !empty($plugin_info[$active_type]->parent)) {
    1006          $title = $PAGE->course->fullname.': ' . $stractive_type . ': ' . $stractive_plugin;
    1007      } else {
    1008          $title = $PAGE->course->fullname.': ' . $stractive_plugin;
    1009      }
    1010  
    1011      if ($active_type == 'report') {
    1012          $PAGE->set_pagelayout('report');
    1013      } else {
    1014          $PAGE->set_pagelayout('admin');
    1015      }
    1016      $PAGE->set_title(get_string('grades') . ': ' . $stractive_type);
    1017      $PAGE->set_heading($title);
    1018      if ($buttons instanceof single_button) {
    1019          $buttons = $OUTPUT->render($buttons);
    1020      }
    1021      $PAGE->set_button($buttons);
    1022      if ($courseid != SITEID) {
    1023          grade_extend_settings($plugin_info, $courseid);
    1024      }
    1025  
    1026      // Set the current report as active in the breadcrumbs.
    1027      if ($active_plugin !== null && $reportnav = $PAGE->settingsnav->find($active_plugin, navigation_node::TYPE_SETTING)) {
    1028          $reportnav->make_active();
    1029      }
    1030  
    1031      $returnval = $OUTPUT->header();
    1032  
    1033      if (!$return) {
    1034          echo $returnval;
    1035      }
    1036  
    1037      // Guess heading if not given explicitly
    1038      if (!$heading) {
    1039          $heading = $stractive_plugin;
    1040      }
    1041  
    1042      if ($shownavigation) {
    1043          $navselector = null;
    1044          if ($courseid != SITEID &&
    1045                  ($CFG->grade_navmethod == GRADE_NAVMETHOD_COMBO || $CFG->grade_navmethod == GRADE_NAVMETHOD_DROPDOWN)) {
    1046              // It's absolutely essential that this grade plugin selector is shown after the user header. Just ask Fred.
    1047              $navselector = print_grade_plugin_selector($plugin_info, $active_type, $active_plugin, true);
    1048              if ($return) {
    1049                  $returnval .= $navselector;
    1050              } else if (!isset($user)) {
    1051                  echo $navselector;
    1052              }
    1053          }
    1054  
    1055          $output = '';
    1056          // Add a help dialogue box if provided.
    1057          if (isset($headerhelpidentifier)) {
    1058              $output = $OUTPUT->heading_with_help($heading, $headerhelpidentifier, $headerhelpcomponent);
    1059          } else {
    1060              if (isset($user)) {
    1061                  $output = $OUTPUT->context_header(
    1062                          array(
    1063                              'heading' => html_writer::link(new moodle_url('/user/view.php', array('id' => $user->id,
    1064                                  'course' => $courseid)), fullname($user)),
    1065                              'user' => $user,
    1066                              'usercontext' => context_user::instance($user->id)
    1067                          ), 2
    1068                      ) . $navselector;
    1069              } else {
    1070                  $output = $OUTPUT->heading($heading);
    1071              }
    1072          }
    1073  
    1074          if ($return) {
    1075              $returnval .= $output;
    1076          } else {
    1077              echo $output;
    1078          }
    1079  
    1080          if ($courseid != SITEID &&
    1081                  ($CFG->grade_navmethod == GRADE_NAVMETHOD_COMBO || $CFG->grade_navmethod == GRADE_NAVMETHOD_TABS)) {
    1082              $returnval .= grade_print_tabs($active_type, $active_plugin, $plugin_info, $return);
    1083          }
    1084      }
    1085  
    1086      $returnval .= print_natural_aggregation_upgrade_notice($courseid,
    1087                                                             context_course::instance($courseid),
    1088                                                             $PAGE->url,
    1089                                                             $return);
    1090  
    1091      if ($return) {
    1092          return $returnval;
    1093      }
    1094  }
    1095  
    1096  /**
    1097   * Utility class used for return tracking when using edit and other forms in grade plugins
    1098   *
    1099   * @package core_grades
    1100   * @copyright 2009 Nicolas Connault
    1101   * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
    1102   */
    1103  class grade_plugin_return {
    1104      /**
    1105       * Type of grade plugin (e.g. 'edit', 'report')
    1106       *
    1107       * @var string
    1108       */
    1109      public $type;
    1110      /**
    1111       * Name of grade plugin (e.g. 'grader', 'overview')
    1112       *
    1113       * @var string
    1114       */
    1115      public $plugin;
    1116      /**
    1117       * Course id being viewed
    1118       *
    1119       * @var int
    1120       */
    1121      public $courseid;
    1122      /**
    1123       * Id of user whose information is being viewed/edited
    1124       *
    1125       * @var int
    1126       */
    1127      public $userid;
    1128      /**
    1129       * Id of group for which information is being viewed/edited
    1130       *
    1131       * @var int
    1132       */
    1133      public $groupid;
    1134      /**
    1135       * Current page # within output
    1136       *
    1137       * @var int
    1138       */
    1139      public $page;
    1140  
    1141      /**
    1142       * Constructor
    1143       *
    1144       * @param array $params - associative array with return parameters, if not supplied parameter are taken from _GET or _POST
    1145       */
    1146      public function __construct($params = []) {
    1147          $this->type     = optional_param('gpr_type', null, PARAM_SAFEDIR);
    1148          $this->plugin   = optional_param('gpr_plugin', null, PARAM_PLUGIN);
    1149          $this->courseid = optional_param('gpr_courseid', null, PARAM_INT);
    1150          $this->userid   = optional_param('gpr_userid', null, PARAM_INT);
    1151          $this->groupid  = optional_param('gpr_groupid', null, PARAM_INT);
    1152          $this->page     = optional_param('gpr_page', null, PARAM_INT);
    1153  
    1154          foreach ($params as $key => $value) {
    1155              if (property_exists($this, $key)) {
    1156                  $this->$key = $value;
    1157              }
    1158          }
    1159          // Allow course object rather than id to be used to specify course
    1160          // - avoid unnecessary use of get_course.
    1161          if (array_key_exists('course', $params)) {
    1162              $course = $params['course'];
    1163              $this->courseid = $course->id;
    1164          } else {
    1165              $course = null;
    1166          }
    1167          // If group has been explicitly set in constructor parameters,
    1168          // we should respect that.
    1169          if (!array_key_exists('groupid', $params)) {
    1170              // Otherwise, 'group' in request parameters is a request for a change.
    1171              // In that case, or if we have no group at all, we should get groupid from
    1172              // groups_get_course_group, which will do some housekeeping as well as
    1173              // give us the correct value.
    1174              $changegroup = optional_param('group', -1, PARAM_INT);
    1175              if ($changegroup !== -1 or (empty($this->groupid) and !empty($this->courseid))) {
    1176                  if ($course === null) {
    1177                      $course = get_course($this->courseid);
    1178                  }
    1179                  $this->groupid = groups_get_course_group($course, true);
    1180              }
    1181          }
    1182      }
    1183  
    1184      /**
    1185       * Old syntax of class constructor. Deprecated in PHP7.
    1186       *
    1187       * @deprecated since Moodle 3.1
    1188       */
    1189      public function grade_plugin_return($params = null) {
    1190          debugging('Use of class name as constructor is deprecated', DEBUG_DEVELOPER);
    1191          self::__construct($params);
    1192      }
    1193  
    1194      /**
    1195       * Returns return parameters as options array suitable for buttons.
    1196       * @return array options
    1197       */
    1198      public function get_options() {
    1199          if (empty($this->type)) {
    1200              return array();
    1201          }
    1202  
    1203          $params = array();
    1204  
    1205          if (!empty($this->plugin)) {
    1206              $params['plugin'] = $this->plugin;
    1207          }
    1208  
    1209          if (!empty($this->courseid)) {
    1210              $params['id'] = $this->courseid;
    1211          }
    1212  
    1213          if (!empty($this->userid)) {
    1214              $params['userid'] = $this->userid;
    1215          }
    1216  
    1217          if (!empty($this->groupid)) {
    1218              $params['group'] = $this->groupid;
    1219          }
    1220  
    1221          if (!empty($this->page)) {
    1222              $params['page'] = $this->page;
    1223          }
    1224  
    1225          return $params;
    1226      }
    1227  
    1228      /**
    1229       * Returns return url
    1230       *
    1231       * @param string $default default url when params not set
    1232       * @param array  $extras Extra URL parameters
    1233       *
    1234       * @return string url
    1235       */
    1236      public function get_return_url($default, $extras=null) {
    1237          global $CFG;
    1238  
    1239          if (empty($this->type) or empty($this->plugin)) {
    1240              return $default;
    1241          }
    1242  
    1243          $url = $CFG->wwwroot.'/grade/'.$this->type.'/'.$this->plugin.'/index.php';
    1244          $glue = '?';
    1245  
    1246          if (!empty($this->courseid)) {
    1247              $url .= $glue.'id='.$this->courseid;
    1248              $glue = '&amp;';
    1249          }
    1250  
    1251          if (!empty($this->userid)) {
    1252              $url .= $glue.'userid='.$this->userid;
    1253              $glue = '&amp;';
    1254          }
    1255  
    1256          if (!empty($this->groupid)) {
    1257              $url .= $glue.'group='.$this->groupid;
    1258              $glue = '&amp;';
    1259          }
    1260  
    1261          if (!empty($this->page)) {
    1262              $url .= $glue.'page='.$this->page;
    1263              $glue = '&amp;';
    1264          }
    1265  
    1266          if (!empty($extras)) {
    1267              foreach ($extras as $key=>$value) {
    1268                  $url .= $glue.$key.'='.$value;
    1269                  $glue = '&amp;';
    1270              }
    1271          }
    1272  
    1273          return $url;
    1274      }
    1275  
    1276      /**
    1277       * Returns string with hidden return tracking form elements.
    1278       * @return string
    1279       */
    1280      public function get_form_fields() {
    1281          if (empty($this->type)) {
    1282              return '';
    1283          }
    1284  
    1285          $result  = '<input type="hidden" name="gpr_type" value="'.$this->type.'" />';
    1286  
    1287          if (!empty($this->plugin)) {
    1288              $result .= '<input type="hidden" name="gpr_plugin" value="'.$this->plugin.'" />';
    1289          }
    1290  
    1291          if (!empty($this->courseid)) {
    1292              $result .= '<input type="hidden" name="gpr_courseid" value="'.$this->courseid.'" />';
    1293          }
    1294  
    1295          if (!empty($this->userid)) {
    1296              $result .= '<input type="hidden" name="gpr_userid" value="'.$this->userid.'" />';
    1297          }
    1298  
    1299          if (!empty($this->groupid)) {
    1300              $result .= '<input type="hidden" name="gpr_groupid" value="'.$this->groupid.'" />';
    1301          }
    1302  
    1303          if (!empty($this->page)) {
    1304              $result .= '<input type="hidden" name="gpr_page" value="'.$this->page.'" />';
    1305          }
    1306          return $result;
    1307      }
    1308  
    1309      /**
    1310       * Add hidden elements into mform
    1311       *
    1312       * @param object &$mform moodle form object
    1313       *
    1314       * @return void
    1315       */
    1316      public function add_mform_elements(&$mform) {
    1317          if (empty($this->type)) {
    1318              return;
    1319          }
    1320  
    1321          $mform->addElement('hidden', 'gpr_type', $this->type);
    1322          $mform->setType('gpr_type', PARAM_SAFEDIR);
    1323  
    1324          if (!empty($this->plugin)) {
    1325              $mform->addElement('hidden', 'gpr_plugin', $this->plugin);
    1326              $mform->setType('gpr_plugin', PARAM_PLUGIN);
    1327          }
    1328  
    1329          if (!empty($this->courseid)) {
    1330              $mform->addElement('hidden', 'gpr_courseid', $this->courseid);
    1331              $mform->setType('gpr_courseid', PARAM_INT);
    1332          }
    1333  
    1334          if (!empty($this->userid)) {
    1335              $mform->addElement('hidden', 'gpr_userid', $this->userid);
    1336              $mform->setType('gpr_userid', PARAM_INT);
    1337          }
    1338  
    1339          if (!empty($this->groupid)) {
    1340              $mform->addElement('hidden', 'gpr_groupid', $this->groupid);
    1341              $mform->setType('gpr_groupid', PARAM_INT);
    1342          }
    1343  
    1344          if (!empty($this->page)) {
    1345              $mform->addElement('hidden', 'gpr_page', $this->page);
    1346              $mform->setType('gpr_page', PARAM_INT);
    1347          }
    1348      }
    1349  
    1350      /**
    1351       * Add return tracking params into url
    1352       *
    1353       * @param moodle_url $url A URL
    1354       *
    1355       * @return string $url with return tracking params
    1356       */
    1357      public function add_url_params(moodle_url $url) {
    1358          if (empty($this->type)) {
    1359              return $url;
    1360          }
    1361  
    1362          $url->param('gpr_type', $this->type);
    1363  
    1364          if (!empty($this->plugin)) {
    1365              $url->param('gpr_plugin', $this->plugin);
    1366          }
    1367  
    1368          if (!empty($this->courseid)) {
    1369              $url->param('gpr_courseid' ,$this->courseid);
    1370          }
    1371  
    1372          if (!empty($this->userid)) {
    1373              $url->param('gpr_userid', $this->userid);
    1374          }
    1375  
    1376          if (!empty($this->groupid)) {
    1377              $url->param('gpr_groupid', $this->groupid);
    1378          }
    1379  
    1380          if (!empty($this->page)) {
    1381              $url->param('gpr_page', $this->page);
    1382          }
    1383  
    1384          return $url;
    1385      }
    1386  }
    1387  
    1388  /**
    1389   * Function central to gradebook for building and printing the navigation (breadcrumb trail).
    1390   *
    1391   * @param string $path The path of the calling script (using __FILE__?)
    1392   * @param string $pagename The language string to use as the last part of the navigation (non-link)
    1393   * @param mixed  $id Either a plain integer (assuming the key is 'id') or
    1394   *                   an array of keys and values (e.g courseid => $courseid, itemid...)
    1395   *
    1396   * @return string
    1397   */
    1398  function grade_build_nav($path, $pagename=null, $id=null) {
    1399      global $CFG, $COURSE, $PAGE;
    1400  
    1401      $strgrades = get_string('grades', 'grades');
    1402  
    1403      // Parse the path and build navlinks from its elements
    1404      $dirroot_length = strlen($CFG->dirroot) + 1; // Add 1 for the first slash
    1405      $path = substr($path, $dirroot_length);
    1406      $path = str_replace('\\', '/', $path);
    1407  
    1408      $path_elements = explode('/', $path);
    1409  
    1410      $path_elements_count = count($path_elements);
    1411  
    1412      // First link is always 'grade'
    1413      $PAGE->navbar->add($strgrades, new moodle_url('/grade/index.php', array('id'=>$COURSE->id)));
    1414  
    1415      $link = null;
    1416      $numberofelements = 3;
    1417  
    1418      // Prepare URL params string
    1419      $linkparams = array();
    1420      if (!is_null($id)) {
    1421          if (is_array($id)) {
    1422              foreach ($id as $idkey => $idvalue) {
    1423                  $linkparams[$idkey] = $idvalue;
    1424              }
    1425          } else {
    1426              $linkparams['id'] = $id;
    1427          }
    1428      }
    1429  
    1430      $navlink4 = null;
    1431  
    1432      // Remove file extensions from filenames
    1433      foreach ($path_elements as $key => $filename) {
    1434          $path_elements[$key] = str_replace('.php', '', $filename);
    1435      }
    1436  
    1437      // Second level links
    1438      switch ($path_elements[1]) {
    1439          case 'edit': // No link
    1440              if ($path_elements[3] != 'index.php') {
    1441                  $numberofelements = 4;
    1442              }
    1443              break;
    1444          case 'import': // No link
    1445              break;
    1446          case 'export': // No link
    1447              break;
    1448          case 'report':
    1449              // $id is required for this link. Do not print it if $id isn't given
    1450              if (!is_null($id)) {
    1451                  $link = new moodle_url('/grade/report/index.php', $linkparams);
    1452              }
    1453  
    1454              if ($path_elements[2] == 'grader') {
    1455                  $numberofelements = 4;
    1456              }
    1457              break;
    1458  
    1459          default:
    1460              // If this element isn't among the ones already listed above, it isn't supported, throw an error.
    1461              debugging("grade_build_nav() doesn't support ". $path_elements[1] .
    1462                      " as the second path element after 'grade'.");
    1463              return false;
    1464      }
    1465      $PAGE->navbar->add(get_string($path_elements[1], 'grades'), $link);
    1466  
    1467      // Third level links
    1468      if (empty($pagename)) {
    1469          $pagename = get_string($path_elements[2], 'grades');
    1470      }
    1471  
    1472      switch ($numberofelements) {
    1473          case 3:
    1474              $PAGE->navbar->add($pagename, $link);
    1475              break;
    1476          case 4:
    1477              if ($path_elements[2] == 'grader' AND $path_elements[3] != 'index.php') {
    1478                  $PAGE->navbar->add(get_string('pluginname', 'gradereport_grader'), new moodle_url('/grade/report/grader/index.php', $linkparams));
    1479              }
    1480              $PAGE->navbar->add($pagename);
    1481              break;
    1482      }
    1483  
    1484      return '';
    1485  }
    1486  
    1487  /**
    1488   * General structure representing grade items in course
    1489   *
    1490   * @package core_grades
    1491   * @copyright 2009 Nicolas Connault
    1492   * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
    1493   */
    1494  class grade_structure {
    1495      public $context;
    1496  
    1497      public $courseid;
    1498  
    1499      /**
    1500      * Reference to modinfo for current course (for performance, to save
    1501      * retrieving it from courseid every time). Not actually set except for
    1502      * the grade_tree type.
    1503      * @var course_modinfo
    1504      */
    1505      public $modinfo;
    1506  
    1507      /**
    1508       * 1D array of grade items only
    1509       */
    1510      public $items;
    1511  
    1512      /**
    1513       * Returns icon of element
    1514       *
    1515       * @param array &$element An array representing an element in the grade_tree
    1516       * @param bool  $spacerifnone return spacer if no icon found
    1517       *
    1518       * @return string icon or spacer
    1519       */
    1520      public function get_element_icon(&$element, $spacerifnone=false) {
    1521          global $CFG, $OUTPUT;
    1522          require_once $CFG->libdir.'/filelib.php';
    1523  
    1524          $outputstr = '';
    1525  
    1526          // Object holding pix_icon information before instantiation.
    1527          $icon = new stdClass();
    1528          $icon->attributes = array(
    1529              'class' => 'icon itemicon'
    1530          );
    1531          $icon->component = 'moodle';
    1532  
    1533          $none = true;
    1534          switch ($element['type']) {
    1535              case 'item':
    1536              case 'courseitem':
    1537              case 'categoryitem':
    1538                  $none = false;
    1539  
    1540                  $is_course   = $element['object']->is_course_item();
    1541                  $is_category = $element['object']->is_category_item();
    1542                  $is_scale    = $element['object']->gradetype == GRADE_TYPE_SCALE;
    1543                  $is_value    = $element['object']->gradetype == GRADE_TYPE_VALUE;
    1544                  $is_outcome  = !empty($element['object']->outcomeid);
    1545  
    1546                  if ($element['object']->is_calculated()) {
    1547                      $icon->pix = 'i/calc';
    1548                      $icon->title = s(get_string('calculatedgrade', 'grades'));
    1549  
    1550                  } else if (($is_course or $is_category) and ($is_scale or $is_value)) {
    1551                      if ($category = $element['object']->get_item_category()) {
    1552                          $aggrstrings = grade_helper::get_aggregation_strings();
    1553                          $stragg = $aggrstrings[$category->aggregation];
    1554  
    1555                          $icon->pix = 'i/calc';
    1556                          $icon->title = s($stragg);
    1557  
    1558                          switch ($category->aggregation) {
    1559                              case GRADE_AGGREGATE_MEAN:
    1560                              case GRADE_AGGREGATE_MEDIAN:
    1561                              case GRADE_AGGREGATE_WEIGHTED_MEAN:
    1562                              case GRADE_AGGREGATE_WEIGHTED_MEAN2:
    1563                              case GRADE_AGGREGATE_EXTRACREDIT_MEAN:
    1564                                  $icon->pix = 'i/agg_mean';
    1565                                  break;
    1566                              case GRADE_AGGREGATE_SUM:
    1567                                  $icon->pix = 'i/agg_sum';
    1568                                  break;
    1569                          }
    1570                      }
    1571  
    1572                  } else if ($element['object']->itemtype == 'mod') {
    1573                      // Prevent outcomes displaying the same icon as the activity they are attached to.
    1574                      if ($is_outcome) {
    1575                          $icon->pix = 'i/outcomes';
    1576                          $icon->title = s(get_string('outcome', 'grades'));
    1577                      } else {
    1578                          $modinfo = get_fast_modinfo($element['object']->courseid);
    1579                          $module = $element['object']->itemmodule;
    1580                          $instanceid = $element['object']->iteminstance;
    1581                          if (isset($modinfo->instances[$module][$instanceid])) {
    1582                              $icon->url = $modinfo->instances[$module][$instanceid]->get_icon_url();
    1583                          } else {
    1584                              $icon->pix = 'icon';
    1585                              $icon->component = $element['object']->itemmodule;
    1586                          }
    1587                          $icon->title = s(get_string('modulename', $element['object']->itemmodule));
    1588                      }
    1589                  } else if ($element['object']->itemtype == 'manual') {
    1590                      if ($element['object']->is_outcome_item()) {
    1591                          $icon->pix = 'i/outcomes';
    1592                          $icon->title = s(get_string('outcome', 'grades'));
    1593                      } else {
    1594                          $icon->pix = 'i/manual_item';
    1595                          $icon->title = s(get_string('manualitem', 'grades'));
    1596                      }
    1597                  }
    1598                  break;
    1599  
    1600              case 'category':
    1601                  $none = false;
    1602                  $icon->pix = 'i/folder';
    1603                  $icon->title = s(get_string('category', 'grades'));
    1604                  break;
    1605          }
    1606  
    1607          if ($none) {
    1608              if ($spacerifnone) {
    1609                  $outputstr = $OUTPUT->spacer() . ' ';
    1610              }
    1611          } else if (isset($icon->url)) {
    1612              $outputstr = html_writer::img($icon->url, $icon->title, $icon->attributes);
    1613          } else {
    1614              $outputstr = $OUTPUT->pix_icon($icon->pix, $icon->title, $icon->component, $icon->attributes);
    1615          }
    1616  
    1617          return $outputstr;
    1618      }
    1619  
    1620      /**
    1621       * Returns name of element optionally with icon and link
    1622       *
    1623       * @param array &$element An array representing an element in the grade_tree
    1624       * @param bool  $withlink Whether or not this header has a link
    1625       * @param bool  $icon Whether or not to display an icon with this header
    1626       * @param bool  $spacerifnone return spacer if no icon found
    1627       * @param bool  $withdescription Show description if defined by this item.
    1628       * @param bool  $fulltotal If the item is a category total, returns $categoryname."total"
    1629       *                         instead of "Category total" or "Course total"
    1630       *
    1631       * @return string header
    1632       */
    1633      public function get_element_header(&$element, $withlink = false, $icon = true, $spacerifnone = false,
    1634          $withdescription = false, $fulltotal = false) {
    1635          $header = '';
    1636  
    1637          if ($icon) {
    1638              $header .= $this->get_element_icon($element, $spacerifnone);
    1639          }
    1640  
    1641          $title = $element['object']->get_name($fulltotal);
    1642          $titleunescaped = $element['object']->get_name($fulltotal, false);
    1643          $header .= $title;
    1644  
    1645          if ($element['type'] != 'item' and $element['type'] != 'categoryitem' and
    1646              $element['type'] != 'courseitem') {
    1647              return $header;
    1648          }
    1649  
    1650          if ($withlink && $url = $this->get_activity_link($element)) {
    1651              $a = new stdClass();
    1652              $a->name = get_string('modulename', $element['object']->itemmodule);
    1653              $a->title = $titleunescaped;
    1654              $title = get_string('linktoactivity', 'grades', $a);
    1655  
    1656              $header = html_writer::link($url, $header, array('title' => $title, 'class' => 'gradeitemheader'));
    1657          } else {
    1658              $header = html_writer::span($header, 'gradeitemheader', array('title' => $titleunescaped, 'tabindex' => '0'));
    1659          }
    1660  
    1661          if ($withdescription) {
    1662              $desc = $element['object']->get_description();
    1663              if (!empty($desc)) {
    1664                  $header .= '<div class="gradeitemdescription">' . s($desc) . '</div><div class="gradeitemdescriptionfiller"></div>';
    1665              }
    1666          }
    1667  
    1668          return $header;
    1669      }
    1670  
    1671      private function get_activity_link($element) {
    1672          global $CFG;
    1673          /** @var array static cache of the grade.php file existence flags */
    1674          static $hasgradephp = array();
    1675  
    1676          $itemtype = $element['object']->itemtype;
    1677          $itemmodule = $element['object']->itemmodule;
    1678          $iteminstance = $element['object']->iteminstance;
    1679          $itemnumber = $element['object']->itemnumber;
    1680  
    1681          // Links only for module items that have valid instance, module and are
    1682          // called from grade_tree with valid modinfo
    1683          if ($itemtype != 'mod' || !$iteminstance || !$itemmodule || !$this->modinfo) {
    1684              return null;
    1685          }
    1686  
    1687          // Get $cm efficiently and with visibility information using modinfo
    1688          $instances = $this->modinfo->get_instances();
    1689          if (empty($instances[$itemmodule][$iteminstance])) {
    1690              return null;
    1691          }
    1692          $cm = $instances[$itemmodule][$iteminstance];
    1693  
    1694          // Do not add link if activity is not visible to the current user
    1695          if (!$cm->uservisible) {
    1696              return null;
    1697          }
    1698  
    1699          if (!array_key_exists($itemmodule, $hasgradephp)) {
    1700              if (file_exists($CFG->dirroot . '/mod/' . $itemmodule . '/grade.php')) {
    1701                  $hasgradephp[$itemmodule] = true;
    1702              } else {
    1703                  $hasgradephp[$itemmodule] = false;
    1704              }
    1705          }
    1706  
    1707          // If module has grade.php, link to that, otherwise view.php
    1708          if ($hasgradephp[$itemmodule]) {
    1709              $args = array('id' => $cm->id, 'itemnumber' => $itemnumber);
    1710              if (isset($element['userid'])) {
    1711                  $args['userid'] = $element['userid'];
    1712              }
    1713              return new moodle_url('/mod/' . $itemmodule . '/grade.php', $args);
    1714          } else {
    1715              return new moodle_url('/mod/' . $itemmodule . '/view.php', array('id' => $cm->id));
    1716          }
    1717      }
    1718  
    1719      /**
    1720       * Returns URL of a page that is supposed to contain detailed grade analysis
    1721       *
    1722       * At the moment, only activity modules are supported. The method generates link
    1723       * to the module's file grade.php with the parameters id (cmid), itemid, itemnumber,
    1724       * gradeid and userid. If the grade.php does not exist, null is returned.
    1725       *
    1726       * @return moodle_url|null URL or null if unable to construct it
    1727       */
    1728      public function get_grade_analysis_url(grade_grade $grade) {
    1729          global $CFG;
    1730          /** @var array static cache of the grade.php file existence flags */
    1731          static $hasgradephp = array();
    1732  
    1733          if (empty($grade->grade_item) or !($grade->grade_item instanceof grade_item)) {
    1734              throw new coding_exception('Passed grade without the associated grade item');
    1735          }
    1736          $item = $grade->grade_item;
    1737  
    1738          if (!$item->is_external_item()) {
    1739              // at the moment, only activity modules are supported
    1740              return null;
    1741          }
    1742          if ($item->itemtype !== 'mod') {
    1743              throw new coding_exception('Unknown external itemtype: '.$item->itemtype);
    1744          }
    1745          if (empty($item->iteminstance) or empty($item->itemmodule) or empty($this->modinfo)) {
    1746              return null;
    1747          }
    1748  
    1749          if (!array_key_exists($item->itemmodule, $hasgradephp)) {
    1750              if (file_exists($CFG->dirroot . '/mod/' . $item->itemmodule . '/grade.php')) {
    1751                  $hasgradephp[$item->itemmodule] = true;
    1752              } else {
    1753                  $hasgradephp[$item->itemmodule] = false;
    1754              }
    1755          }
    1756  
    1757          if (!$hasgradephp[$item->itemmodule]) {
    1758              return null;
    1759          }
    1760  
    1761          $instances = $this->modinfo->get_instances();
    1762          if (empty($instances[$item->itemmodule][$item->iteminstance])) {
    1763              return null;
    1764          }
    1765          $cm = $instances[$item->itemmodule][$item->iteminstance];
    1766          if (!$cm->uservisible) {
    1767              return null;
    1768          }
    1769  
    1770          $url = new moodle_url('/mod/'.$item->itemmodule.'/grade.php', array(
    1771              'id'         => $cm->id,
    1772              'itemid'     => $item->id,
    1773              'itemnumber' => $item->itemnumber,
    1774              'gradeid'    => $grade->id,
    1775              'userid'     => $grade->userid,
    1776          ));
    1777  
    1778          return $url;
    1779      }
    1780  
    1781      /**
    1782       * Returns an action icon leading to the grade analysis page
    1783       *
    1784       * @param grade_grade $grade
    1785       * @return string
    1786       */
    1787      public function get_grade_analysis_icon(grade_grade $grade) {
    1788          global $OUTPUT;
    1789  
    1790          $url = $this->get_grade_analysis_url($grade);
    1791          if (is_null($url)) {
    1792              return '';
    1793          }
    1794  
    1795          $title = get_string('gradeanalysis', 'core_grades');
    1796          return $OUTPUT->action_icon($url, new pix_icon('t/preview', ''), null,
    1797                  ['title' => $title, 'aria-label' => $title]);
    1798      }
    1799  
    1800      /**
    1801       * Returns the grade eid - the grade may not exist yet.
    1802       *
    1803       * @param grade_grade $grade_grade A grade_grade object
    1804       *
    1805       * @return string eid
    1806       */
    1807      public function get_grade_eid($grade_grade) {
    1808          if (empty($grade_grade->id)) {
    1809              return 'n'.$grade_grade->itemid.'u'.$grade_grade->userid;
    1810          } else {
    1811              return 'g'.$grade_grade->id;
    1812          }
    1813      }
    1814  
    1815      /**
    1816       * Returns the grade_item eid
    1817       * @param grade_item $grade_item A grade_item object
    1818       * @return string eid
    1819       */
    1820      public function get_item_eid($grade_item) {
    1821          return 'ig'.$grade_item->id;
    1822      }
    1823  
    1824      /**
    1825       * Given a grade_tree element, returns an array of parameters
    1826       * used to build an icon for that element.
    1827       *
    1828       * @param array $element An array representing an element in the grade_tree
    1829       *
    1830       * @return array
    1831       */
    1832      public function get_params_for_iconstr($element) {
    1833          $strparams = new stdClass();
    1834          $strparams->category = '';
    1835          $strparams->itemname = '';
    1836          $strparams->itemmodule = '';
    1837  
    1838          if (!method_exists($element['object'], 'get_name')) {
    1839              return $strparams;
    1840          }
    1841  
    1842          $strparams->itemname = html_to_text($element['object']->get_name());
    1843  
    1844          // If element name is categorytotal, get the name of the parent category
    1845          if ($strparams->itemname == get_string('categorytotal', 'grades')) {
    1846              $parent = $element['object']->get_parent_category();
    1847              $strparams->category = $parent->get_name() . ' ';
    1848          } else {
    1849              $strparams->category = '';
    1850          }
    1851  
    1852          $strparams->itemmodule = null;
    1853          if (isset($element['object']->itemmodule)) {
    1854              $strparams->itemmodule = $element['object']->itemmodule;
    1855          }
    1856          return $strparams;
    1857      }
    1858  
    1859      /**
    1860       * Return a reset icon for the given element.
    1861       *
    1862       * @param array  $element An array representing an element in the grade_tree
    1863       * @param object $gpr A grade_plugin_return object
    1864       * @param bool $returnactionmenulink return the instance of action_menu_link instead of string
    1865       * @return string|action_menu_link
    1866       */
    1867      public function get_reset_icon($element, $gpr, $returnactionmenulink = false) {
    1868          global $CFG, $OUTPUT;
    1869  
    1870          // Limit to category items set to use the natural weights aggregation method, and users
    1871          // with the capability to manage grades.
    1872          if ($element['type'] != 'category' || $element['object']->aggregation != GRADE_AGGREGATE_SUM ||
    1873                  !has_capability('moodle/grade:manage', $this->context)) {
    1874              return $returnactionmenulink ? null : '';
    1875          }
    1876  
    1877          $str = get_string('resetweights', 'grades', $this->get_params_for_iconstr($element));
    1878          $url = new moodle_url('/grade/edit/tree/action.php', array(
    1879              'id' => $this->courseid,
    1880              'action' => 'resetweights',
    1881              'eid' => $element['eid'],
    1882              'sesskey' => sesskey(),
    1883          ));
    1884  
    1885          if ($returnactionmenulink) {
    1886              return new action_menu_link_secondary($gpr->add_url_params($url), new pix_icon('t/reset', $str),
    1887                  get_string('resetweightsshort', 'grades'));
    1888          } else {
    1889              return $OUTPUT->action_icon($gpr->add_url_params($url), new pix_icon('t/reset', $str));
    1890          }
    1891      }
    1892  
    1893      /**
    1894       * Return edit icon for give element
    1895       *
    1896       * @param array  $element An array representing an element in the grade_tree
    1897       * @param object $gpr A grade_plugin_return object
    1898       * @param bool $returnactionmenulink return the instance of action_menu_link instead of string
    1899       * @return string|action_menu_link
    1900       */
    1901      public function get_edit_icon($element, $gpr, $returnactionmenulink = false) {
    1902          global $CFG, $OUTPUT;
    1903  
    1904          if (!has_capability('moodle/grade:manage', $this->context)) {
    1905              if ($element['type'] == 'grade' and has_capability('moodle/grade:edit', $this->context)) {
    1906                  // oki - let them override grade
    1907              } else {
    1908                  return $returnactionmenulink ? null : '';
    1909              }
    1910          }
    1911  
    1912          static $strfeedback   = null;
    1913          static $streditgrade = null;
    1914          if (is_null($streditgrade)) {
    1915              $streditgrade = get_string('editgrade', 'grades');
    1916              $strfeedback  = get_string('feedback');
    1917          }
    1918  
    1919          $strparams = $this->get_params_for_iconstr($element);
    1920  
    1921          $object = $element['object'];
    1922  
    1923          switch ($element['type']) {
    1924              case 'item':
    1925              case 'categoryitem':
    1926              case 'courseitem':
    1927                  $stredit = get_string('editverbose', 'grades', $strparams);
    1928                  if (empty($object->outcomeid) || empty($CFG->enableoutcomes)) {
    1929                      $url = new moodle_url('/grade/edit/tree/item.php',
    1930                              array('courseid' => $this->courseid, 'id' => $object->id));
    1931                  } else {
    1932                      $url = new moodle_url('/grade/edit/tree/outcomeitem.php',
    1933                              array('courseid' => $this->courseid, 'id' => $object->id));
    1934                  }
    1935                  break;
    1936  
    1937              case 'category':
    1938                  $stredit = get_string('editverbose', 'grades', $strparams);
    1939                  $url = new moodle_url('/grade/edit/tree/category.php',
    1940                          array('courseid' => $this->courseid, 'id' => $object->id));
    1941                  break;
    1942  
    1943              case 'grade':
    1944                  $stredit = $streditgrade;
    1945                  if (empty($object->id)) {
    1946                      $url = new moodle_url('/grade/edit/tree/grade.php',
    1947                              array('courseid' => $this->courseid, 'itemid' => $object->itemid, 'userid' => $object->userid));
    1948                  } else {
    1949                      $url = new moodle_url('/grade/edit/tree/grade.php',
    1950                              array('courseid' => $this->courseid, 'id' => $object->id));
    1951                  }
    1952                  if (!empty($object->feedback)) {
    1953                      $feedback = addslashes_js(trim(format_string($object->feedback, $object->feedbackformat)));
    1954                  }
    1955                  break;
    1956  
    1957              default:
    1958                  $url = null;
    1959          }
    1960  
    1961          if ($url) {
    1962              if ($returnactionmenulink) {
    1963                  return new action_menu_link_secondary($gpr->add_url_params($url),
    1964                      new pix_icon('t/edit', $stredit),
    1965                      get_string('editsettings'));
    1966              } else {
    1967                  return $OUTPUT->action_icon($gpr->add_url_params($url), new pix_icon('t/edit', $stredit));
    1968              }
    1969  
    1970          } else {
    1971              return $returnactionmenulink ? null : '';
    1972          }
    1973      }
    1974  
    1975      /**
    1976       * Return hiding icon for give element
    1977       *
    1978       * @param array  $element An array representing an element in the grade_tree
    1979       * @param object $gpr A grade_plugin_return object
    1980       * @param bool $returnactionmenulink return the instance of action_menu_link instead of string
    1981       * @return string|action_menu_link
    1982       */
    1983      public function get_hiding_icon($element, $gpr, $returnactionmenulink = false) {
    1984          global $CFG, $OUTPUT;
    1985  
    1986          if (!$element['object']->can_control_visibility()) {
    1987              return $returnactionmenulink ? null : '';
    1988          }
    1989  
    1990          if (!has_capability('moodle/grade:manage', $this->context) and
    1991              !has_capability('moodle/grade:hide', $this->context)) {
    1992              return $returnactionmenulink ? null : '';
    1993          }
    1994  
    1995          $strparams = $this->get_params_for_iconstr($element);
    1996          $strshow = get_string('showverbose', 'grades', $strparams);
    1997          $strhide = get_string('hideverbose', 'grades', $strparams);
    1998  
    1999          $url = new moodle_url('/grade/edit/tree/action.php', array('id' => $this->courseid, 'sesskey' => sesskey(), 'eid' => $element['eid']));
    2000          $url = $gpr->add_url_params($url);
    2001  
    2002          if ($element['object']->is_hidden()) {
    2003              $type = 'show';
    2004              $tooltip = $strshow;
    2005  
    2006              // Change the icon and add a tooltip showing the date
    2007              if ($element['type'] != 'category' and $element['object']->get_hidden() > 1) {
    2008                  $type = 'hiddenuntil';
    2009                  $tooltip = get_string('hiddenuntildate', 'grades',
    2010                          userdate($element['object']->get_hidden()));
    2011              }
    2012  
    2013              $url->param('action', 'show');
    2014  
    2015              if ($returnactionmenulink) {
    2016                  $hideicon = new action_menu_link_secondary($url, new pix_icon('t/'.$type, $tooltip), get_string('show'));
    2017              } else {
    2018                  $hideicon = $OUTPUT->action_icon($url, new pix_icon('t/'.$type, $tooltip, 'moodle', array('alt'=>$strshow, 'class'=>'smallicon')));
    2019              }
    2020  
    2021          } else {
    2022              $url->param('action', 'hide');
    2023              if ($returnactionmenulink) {
    2024                  $hideicon = new action_menu_link_secondary($url, new pix_icon('t/hide', $strhide), get_string('hide'));
    2025              } else {
    2026                  $hideicon = $OUTPUT->action_icon($url, new pix_icon('t/hide', $strhide));
    2027              }
    2028          }
    2029  
    2030          return $hideicon;
    2031      }
    2032  
    2033      /**
    2034       * Return locking icon for given element
    2035       *
    2036       * @param array  $element An array representing an element in the grade_tree
    2037       * @param object $gpr A grade_plugin_return object
    2038       *
    2039       * @return string
    2040       */
    2041      public function get_locking_icon($element, $gpr) {
    2042          global $CFG, $OUTPUT;
    2043  
    2044          $strparams = $this->get_params_for_iconstr($element);
    2045          $strunlock = get_string('unlockverbose', 'grades', $strparams);
    2046          $strlock = get_string('lockverbose', 'grades', $strparams);
    2047  
    2048          $url = new moodle_url('/grade/edit/tree/action.php', array('id' => $this->courseid, 'sesskey' => sesskey(), 'eid' => $element['eid']));
    2049          $url = $gpr->add_url_params($url);
    2050  
    2051          // Don't allow an unlocking action for a grade whose grade item is locked: just print a state icon
    2052          if ($element['type'] == 'grade' && $element['object']->grade_item->is_locked()) {
    2053              $strparamobj = new stdClass();
    2054              $strparamobj->itemname = $element['object']->grade_item->itemname;
    2055              $strnonunlockable = get_string('nonunlockableverbose', 'grades', $strparamobj);
    2056  
    2057              $action = html_writer::tag('span', $OUTPUT->pix_icon('t/locked', $strnonunlockable),
    2058                      array('class' => 'action-icon'));
    2059  
    2060          } else if ($element['object']->is_locked()) {
    2061              $type = 'unlock';
    2062              $tooltip = $strunlock;
    2063  
    2064              // Change the icon and add a tooltip showing the date
    2065              if ($element['type'] != 'category' and $element['object']->get_locktime() > 1) {
    2066                  $type = 'locktime';
    2067                  $tooltip = get_string('locktimedate', 'grades',
    2068                          userdate($element['object']->get_locktime()));
    2069              }
    2070  
    2071              if (!has_capability('moodle/grade:manage', $this->context) and !has_capability('moodle/grade:unlock', $this->context)) {
    2072                  $action = '';
    2073              } else {
    2074                  $url->param('action', 'unlock');
    2075                  $action = $OUTPUT->action_icon($url, new pix_icon('t/'.$type, $tooltip, 'moodle', array('alt'=>$strunlock, 'class'=>'smallicon')));
    2076              }
    2077  
    2078          } else {
    2079              if (!has_capability('moodle/grade:manage', $this->context) and !has_capability('moodle/grade:lock', $this->context)) {
    2080                  $action = '';
    2081              } else {
    2082                  $url->param('action', 'lock');
    2083                  $action = $OUTPUT->action_icon($url, new pix_icon('t/lock', $strlock));
    2084              }
    2085          }
    2086  
    2087          return $action;
    2088      }
    2089  
    2090      /**
    2091       * Return calculation icon for given element
    2092       *
    2093       * @param array  $element An array representing an element in the grade_tree
    2094       * @param object $gpr A grade_plugin_return object
    2095       * @param bool $returnactionmenulink return the instance of action_menu_link instead of string
    2096       * @return string|action_menu_link
    2097       */
    2098      public function get_calculation_icon($element, $gpr, $returnactionmenulink = false) {
    2099          global $CFG, $OUTPUT;
    2100          if (!has_capability('moodle/grade:manage', $this->context)) {
    2101              return $returnactionmenulink ? null : '';
    2102          }
    2103  
    2104          $type   = $element['type'];
    2105          $object = $element['object'];
    2106  
    2107          if ($type == 'item' or $type == 'courseitem' or $type == 'categoryitem') {
    2108              $strparams = $this->get_params_for_iconstr($element);
    2109              $streditcalculation = get_string('editcalculationverbose', 'grades', $strparams);
    2110  
    2111              $is_scale = $object->gradetype == GRADE_TYPE_SCALE;
    2112              $is_value = $object->gradetype == GRADE_TYPE_VALUE;
    2113  
    2114              // show calculation icon only when calculation possible
    2115              if (!$object->is_external_item() and ($is_scale or $is_value)) {
    2116                  if ($object->is_calculated()) {
    2117                      $icon = 't/calc';
    2118                  } else {
    2119                      $icon = 't/calc_off';
    2120                  }
    2121  
    2122                  $url = new moodle_url('/grade/edit/tree/calculation.php', array('courseid' => $this->courseid, 'id' => $object->id));
    2123                  $url = $gpr->add_url_params($url);
    2124                  if ($returnactionmenulink) {
    2125                      return new action_menu_link_secondary($url,
    2126                          new pix_icon($icon, $streditcalculation),
    2127                          get_string('editcalculation', 'grades'));
    2128                  } else {
    2129                      return $OUTPUT->action_icon($url, new pix_icon($icon, $streditcalculation));
    2130                  }
    2131              }
    2132          }
    2133  
    2134          return $returnactionmenulink ? null : '';
    2135      }
    2136  }
    2137  
    2138  /**
    2139   * Flat structure similar to grade tree.
    2140   *
    2141   * @uses grade_structure
    2142   * @package core_grades
    2143   * @copyright 2009 Nicolas Connault
    2144   * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
    2145   */
    2146  class grade_seq extends grade_structure {
    2147  
    2148      /**
    2149       * 1D array of elements
    2150       */
    2151      public $elements;
    2152  
    2153      /**
    2154       * Constructor, retrieves and stores array of all grade_category and grade_item
    2155       * objects for the given courseid. Full objects are instantiated. Ordering sequence is fixed if needed.
    2156       *
    2157       * @param int  $courseid The course id
    2158       * @param bool $category_grade_last category grade item is the last child
    2159       * @param bool $nooutcomes Whether or not outcomes should be included
    2160       */
    2161      public function __construct($courseid, $category_grade_last=false, $nooutcomes=false) {
    2162          global $USER, $CFG;
    2163  
    2164          $this->courseid   = $courseid;
    2165          $this->context    = context_course::instance($courseid);
    2166  
    2167          // get course grade tree
    2168          $top_element = grade_category::fetch_course_tree($courseid, true);
    2169  
    2170          $this->elements = grade_seq::flatten($top_element, $category_grade_last, $nooutcomes);
    2171  
    2172          foreach ($this->elements as $key=>$unused) {
    2173              $this->items[$this->elements[$key]['object']->id] =& $this->elements[$key]['object'];
    2174          }
    2175      }
    2176  
    2177      /**
    2178       * Old syntax of class constructor. Deprecated in PHP7.
    2179       *
    2180       * @deprecated since Moodle 3.1
    2181       */
    2182      public function grade_seq($courseid, $category_grade_last=false, $nooutcomes=false) {
    2183          debugging('Use of class name as constructor is deprecated', DEBUG_DEVELOPER);
    2184          self::__construct($courseid, $category_grade_last, $nooutcomes);
    2185      }
    2186  
    2187      /**
    2188       * Static recursive helper - makes the grade_item for category the last children
    2189       *
    2190       * @param array &$element The seed of the recursion
    2191       * @param bool $category_grade_last category grade item is the last child
    2192       * @param bool $nooutcomes Whether or not outcomes should be included
    2193       *
    2194       * @return array
    2195       */
    2196      public function flatten(&$element, $category_grade_last, $nooutcomes) {
    2197          if (empty($element['children'])) {
    2198              return array();
    2199          }
    2200          $children = array();
    2201  
    2202          foreach ($element['children'] as $sortorder=>$unused) {
    2203              if ($nooutcomes and $element['type'] != 'category' and
    2204                  $element['children'][$sortorder]['object']->is_outcome_item()) {
    2205                  continue;
    2206              }
    2207              $children[] = $element['children'][$sortorder];
    2208          }
    2209          unset($element['children']);
    2210  
    2211          if ($category_grade_last and count($children) > 1 and
    2212              (
    2213                  $children[0]['type'] === 'courseitem' or
    2214                  $children[0]['type'] === 'categoryitem'
    2215              )
    2216          ) {
    2217              $cat_item = array_shift($children);
    2218              array_push($children, $cat_item);
    2219          }
    2220  
    2221          $result = array();
    2222          foreach ($children as $child) {
    2223              if ($child['type'] == 'category') {
    2224                  $result = $result + grade_seq::flatten($child, $category_grade_last, $nooutcomes);
    2225              } else {
    2226                  $child['eid'] = 'i'.$child['object']->id;
    2227                  $result[$child['object']->id] = $child;
    2228              }
    2229          }
    2230  
    2231          return $result;
    2232      }
    2233  
    2234      /**
    2235       * Parses the array in search of a given eid and returns a element object with
    2236       * information about the element it has found.
    2237       *
    2238       * @param int $eid Gradetree Element ID
    2239       *
    2240       * @return object element
    2241       */
    2242      public function locate_element($eid) {
    2243          // it is a grade - construct a new object
    2244          if (strpos($eid, 'n') === 0) {
    2245              if (!preg_match('/n(\d+)u(\d+)/', $eid, $matches)) {
    2246                  return null;
    2247              }
    2248  
    2249              $itemid = $matches[1];
    2250              $userid = $matches[2];
    2251  
    2252              //extra security check - the grade item must be in this tree
    2253              if (!$item_el = $this->locate_element('ig'.$itemid)) {
    2254                  return null;
    2255              }
    2256  
    2257              // $gradea->id may be null - means does not exist yet
    2258              $grade = new grade_grade(array('itemid'=>$itemid, 'userid'=>$userid));
    2259  
    2260              $grade->grade_item =& $item_el['object']; // this may speedup grade_grade methods!
    2261              return array('eid'=>'n'.$itemid.'u'.$userid,'object'=>$grade, 'type'=>'grade');
    2262  
    2263          } else if (strpos($eid, 'g') === 0) {
    2264              $id = (int) substr($eid, 1);
    2265              if (!$grade = grade_grade::fetch(array('id'=>$id))) {
    2266                  return null;
    2267              }
    2268              //extra security check - the grade item must be in this tree
    2269              if (!$item_el = $this->locate_element('ig'.$grade->itemid)) {
    2270                  return null;
    2271              }
    2272              $grade->grade_item =& $item_el['object']; // this may speedup grade_grade methods!
    2273              return array('eid'=>'g'.$id,'object'=>$grade, 'type'=>'grade');
    2274          }
    2275  
    2276          // it is a category or item
    2277          foreach ($this->elements as $element) {
    2278              if ($element['eid'] == $eid) {
    2279                  return $element;
    2280              }
    2281          }
    2282  
    2283          return null;
    2284      }
    2285  }
    2286  
    2287  /**
    2288   * This class represents a complete tree of categories, grade_items and final grades,
    2289   * organises as an array primarily, but which can also be converted to other formats.
    2290   * It has simple method calls with complex implementations, allowing for easy insertion,
    2291   * deletion and moving of items and categories within the tree.
    2292   *
    2293   * @uses grade_structure
    2294   * @package core_grades
    2295   * @copyright 2009 Nicolas Connault
    2296   * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
    2297   */
    2298  class grade_tree extends grade_structure {
    2299  
    2300      /**
    2301       * The basic representation of the tree as a hierarchical, 3-tiered array.
    2302       * @var object $top_element
    2303       */
    2304      public $top_element;
    2305  
    2306      /**
    2307       * 2D array of grade items and categories
    2308       * @var array $levels
    2309       */
    2310      public $levels;
    2311  
    2312      /**
    2313       * Grade items
    2314       * @var array $items
    2315       */
    2316      public $items;
    2317  
    2318      /**
    2319       * Constructor, retrieves and stores a hierarchical array of all grade_category and grade_item
    2320       * objects for the given courseid. Full objects are instantiated. Ordering sequence is fixed if needed.
    2321       *
    2322       * @param int   $courseid The Course ID
    2323       * @param bool  $fillers include fillers and colspans, make the levels var "rectangular"
    2324       * @param bool  $category_grade_last category grade item is the last child
    2325       * @param array $collapsed array of collapsed categories
    2326       * @param bool  $nooutcomes Whether or not outcomes should be included
    2327       */
    2328      public function __construct($courseid, $fillers=true, $category_grade_last=false,
    2329                                 $collapsed=null, $nooutcomes=false) {
    2330          global $USER, $CFG, $COURSE, $DB;
    2331  
    2332          $this->courseid   = $courseid;
    2333          $this->levels     = array();
    2334          $this->context    = context_course::instance($courseid);
    2335  
    2336          if (!empty($COURSE->id) && $COURSE->id == $this->courseid) {
    2337              $course = $COURSE;
    2338          } else {
    2339              $course = $DB->get_record('course', array('id' => $this->courseid));
    2340          }
    2341          $this->modinfo = get_fast_modinfo($course);
    2342  
    2343          // get course grade tree
    2344          $this->top_element = grade_category::fetch_course_tree($courseid, true);
    2345  
    2346          // collapse the categories if requested
    2347          if (!empty($collapsed)) {
    2348              grade_tree::category_collapse($this->top_element, $collapsed);
    2349          }
    2350  
    2351          // no otucomes if requested
    2352          if (!empty($nooutcomes)) {
    2353              grade_tree::no_outcomes($this->top_element);
    2354          }
    2355  
    2356          // move category item to last position in category
    2357          if ($category_grade_last) {
    2358              grade_tree::category_grade_last($this->top_element);
    2359          }
    2360  
    2361          if ($fillers) {
    2362              // inject fake categories == fillers
    2363              grade_tree::inject_fillers($this->top_element, 0);
    2364              // add colspans to categories and fillers
    2365              grade_tree::inject_colspans($this->top_element);
    2366          }
    2367  
    2368          grade_tree::fill_levels($this->levels, $this->top_element, 0);
    2369  
    2370      }
    2371  
    2372      /**
    2373       * Old syntax of class constructor. Deprecated in PHP7.
    2374       *
    2375       * @deprecated since Moodle 3.1
    2376       */
    2377      public function grade_tree($courseid, $fillers=true, $category_grade_last=false,
    2378                                 $collapsed=null, $nooutcomes=false) {
    2379          debugging('Use of class name as constructor is deprecated', DEBUG_DEVELOPER);
    2380          self::__construct($courseid, $fillers, $category_grade_last, $collapsed, $nooutcomes);
    2381      }
    2382  
    2383      /**
    2384       * Static recursive helper - removes items from collapsed categories
    2385       *
    2386       * @param array &$element The seed of the recursion
    2387       * @param array $collapsed array of collapsed categories
    2388       *
    2389       * @return void
    2390       */
    2391      public function category_collapse(&$element, $collapsed) {
    2392          if ($element['type'] != 'category') {
    2393              return;
    2394          }
    2395          if (empty($element['children']) or count($element['children']) < 2) {
    2396              return;
    2397          }
    2398  
    2399          if (in_array($element['object']->id, $collapsed['aggregatesonly'])) {
    2400              $category_item = reset($element['children']); //keep only category item
    2401              $element['children'] = array(key($element['children'])=>$category_item);
    2402  
    2403          } else {
    2404              if (in_array($element['object']->id, $collapsed['gradesonly'])) { // Remove category item
    2405                  reset($element['children']);
    2406                  $first_key = key($element['children']);
    2407                  unset($element['children'][$first_key]);
    2408              }
    2409              foreach ($element['children'] as $sortorder=>$child) { // Recurse through the element's children
    2410                  grade_tree::category_collapse($element['children'][$sortorder], $collapsed);
    2411              }
    2412          }
    2413      }
    2414  
    2415      /**
    2416       * Static recursive helper - removes all outcomes
    2417       *
    2418       * @param array &$element The seed of the recursion
    2419       *
    2420       * @return void
    2421       */
    2422      public function no_outcomes(&$element) {
    2423          if ($element['type'] != 'category') {
    2424              return;
    2425          }
    2426          foreach ($element['children'] as $sortorder=>$child) {
    2427              if ($element['children'][$sortorder]['type'] == 'item'
    2428                and $element['children'][$sortorder]['object']->is_outcome_item()) {
    2429                  unset($element['children'][$sortorder]);
    2430  
    2431              } else if ($element['children'][$sortorder]['type'] == 'category') {
    2432                  grade_tree::no_outcomes($element['children'][$sortorder]);
    2433              }
    2434          }
    2435      }
    2436  
    2437      /**
    2438       * Static recursive helper - makes the grade_item for category the last children
    2439       *
    2440       * @param array &$element The seed of the recursion
    2441       *
    2442       * @return void
    2443       */
    2444      public function category_grade_last(&$element) {
    2445          if (empty($element['children'])) {
    2446              return;
    2447          }
    2448          if (count($element['children']) < 2) {
    2449              return;
    2450          }
    2451          $first_item = reset($element['children']);
    2452          if ($first_item['type'] == 'categoryitem' or $first_item['type'] == 'courseitem') {
    2453              // the category item might have been already removed
    2454              $order = key($element['children']);
    2455              unset($element['children'][$order]);
    2456              $element['children'][$order] =& $first_item;
    2457          }
    2458          foreach ($element['children'] as $sortorder => $child) {
    2459              grade_tree::category_grade_last($element['children'][$sortorder]);
    2460          }
    2461      }
    2462  
    2463      /**
    2464       * Static recursive helper - fills the levels array, useful when accessing tree elements of one level
    2465       *
    2466       * @param array &$levels The levels of the grade tree through which to recurse
    2467       * @param array &$element The seed of the recursion
    2468       * @param int   $depth How deep are we?
    2469       * @return void
    2470       */
    2471      public function fill_levels(&$levels, &$element, $depth) {
    2472          if (!array_key_exists($depth, $levels)) {
    2473              $levels[$depth] = array();
    2474          }
    2475  
    2476          // prepare unique identifier
    2477          if ($element['type'] == 'category') {
    2478              $element['eid'] = 'cg'.$element['object']->id;
    2479          } else if (in_array($element['type'], array('item', 'courseitem', 'categoryitem'))) {
    2480              $element['eid'] = 'ig'.$element['object']->id;
    2481              $this->items[$element['object']->id] =& $element['object'];
    2482          }
    2483  
    2484          $levels[$depth][] =& $element;
    2485          $depth++;
    2486          if (empty($element['children'])) {
    2487              return;
    2488          }
    2489          $prev = 0;
    2490          foreach ($element['children'] as $sortorder=>$child) {
    2491              grade_tree::fill_levels($levels, $element['children'][$sortorder], $depth);
    2492              $element['children'][$sortorder]['prev'] = $prev;
    2493              $element['children'][$sortorder]['next'] = 0;
    2494              if ($prev) {
    2495                  $element['children'][$prev]['next'] = $sortorder;
    2496              }
    2497              $prev = $sortorder;
    2498          }
    2499      }
    2500  
    2501      /**
    2502       * Determines whether the grade tree item can be displayed.
    2503       * This is particularly targeted for grade categories that have no total (None) when rendering the grade tree.
    2504       * It checks if the grade tree item is of type 'category', and makes sure that the category, or at least one of children,
    2505       * can be output.
    2506       *
    2507       * @param array $element The grade category element.
    2508       * @return bool True if the grade tree item can be displayed. False, otherwise.
    2509       */
    2510      public static function can_output_item($element) {
    2511          $canoutput = true;
    2512  
    2513          if ($element['type'] === 'category') {
    2514              $object = $element['object'];
    2515              $category = grade_category::fetch(array('id' => $object->id));
    2516              // Category has total, we can output this.
    2517              if ($category->get_grade_item()->gradetype != GRADE_TYPE_NONE) {
    2518                  return true;
    2519              }
    2520  
    2521              // Category has no total and has no children, no need to output this.
    2522              if (empty($element['children'])) {
    2523                  return false;
    2524              }
    2525  
    2526              $canoutput = false;
    2527              // Loop over children and make sure at least one child can be output.
    2528              foreach ($element['children'] as $child) {
    2529                  $canoutput = self::can_output_item($child);
    2530                  if ($canoutput) {
    2531                      break;
    2532                  }
    2533              }
    2534          }
    2535  
    2536          return $canoutput;
    2537      }
    2538  
    2539      /**
    2540       * Static recursive helper - makes full tree (all leafes are at the same level)
    2541       *
    2542       * @param array &$element The seed of the recursion
    2543       * @param int   $depth How deep are we?
    2544       *
    2545       * @return int
    2546       */
    2547      public function inject_fillers(&$element, $depth) {
    2548          $depth++;
    2549  
    2550          if (empty($element['children'])) {
    2551              return $depth;
    2552          }
    2553          $chdepths = array();
    2554          $chids = array_keys($element['children']);
    2555          $last_child  = end($chids);
    2556          $first_child = reset($chids);
    2557  
    2558          foreach ($chids as $chid) {
    2559              $chdepths[$chid] = grade_tree::inject_fillers($element['children'][$chid], $depth);
    2560          }
    2561          arsort($chdepths);
    2562  
    2563          $maxdepth = reset($chdepths);
    2564          foreach ($chdepths as $chid=>$chd) {
    2565              if ($chd == $maxdepth) {
    2566                  continue;
    2567              }
    2568              if (!self::can_output_item($element['children'][$chid])) {
    2569                  continue;
    2570              }
    2571              for ($i=0; $i < $maxdepth-$chd; $i++) {
    2572                  if ($chid == $first_child) {
    2573                      $type = 'fillerfirst';
    2574                  } else if ($chid == $last_child) {
    2575                      $type = 'fillerlast';
    2576                  } else {
    2577                      $type = 'filler';
    2578                  }
    2579                  $oldchild =& $element['children'][$chid];
    2580                  $element['children'][$chid] = array('object'=>'filler', 'type'=>$type,
    2581                                                      'eid'=>'', 'depth'=>$element['object']->depth,
    2582                                                      'children'=>array($oldchild));
    2583              }
    2584          }
    2585  
    2586          return $maxdepth;
    2587      }
    2588  
    2589      /**
    2590       * Static recursive helper - add colspan information into categories
    2591       *
    2592       * @param array &$element The seed of the recursion
    2593       *
    2594       * @return int
    2595       */
    2596      public function inject_colspans(&$element) {
    2597          if (empty($element['children'])) {
    2598              return 1;
    2599          }
    2600          $count = 0;
    2601          foreach ($element['children'] as $key=>$child) {
    2602              if (!self::can_output_item($child)) {
    2603                  continue;
    2604              }
    2605              $count += grade_tree::inject_colspans($element['children'][$key]);
    2606          }
    2607          $element['colspan'] = $count;
    2608          return $count;
    2609      }
    2610  
    2611      /**
    2612       * Parses the array in search of a given eid and returns a element object with
    2613       * information about the element it has found.
    2614       * @param int $eid Gradetree Element ID
    2615       * @return object element
    2616       */
    2617      public function locate_element($eid) {
    2618          // it is a grade - construct a new object
    2619          if (strpos($eid, 'n') === 0) {
    2620              if (!preg_match('/n(\d+)u(\d+)/', $eid, $matches)) {
    2621                  return null;
    2622              }
    2623  
    2624              $itemid = $matches[1];
    2625              $userid = $matches[2];
    2626  
    2627              //extra security check - the grade item must be in this tree
    2628              if (!$item_el = $this->locate_element('ig'.$itemid)) {
    2629                  return null;
    2630              }
    2631  
    2632              // $gradea->id may be null - means does not exist yet
    2633              $grade = new grade_grade(array('itemid'=>$itemid, 'userid'=>$userid));
    2634  
    2635              $grade->grade_item =& $item_el['object']; // this may speedup grade_grade methods!
    2636              return array('eid'=>'n'.$itemid.'u'.$userid,'object'=>$grade, 'type'=>'grade');
    2637  
    2638          } else if (strpos($eid, 'g') === 0) {
    2639              $id = (int) substr($eid, 1);
    2640              if (!$grade = grade_grade::fetch(array('id'=>$id))) {
    2641                  return null;
    2642              }
    2643              //extra security check - the grade item must be in this tree
    2644              if (!$item_el = $this->locate_element('ig'.$grade->itemid)) {
    2645                  return null;
    2646              }
    2647              $grade->grade_item =& $item_el['object']; // this may speedup grade_grade methods!
    2648              return array('eid'=>'g'.$id,'object'=>$grade, 'type'=>'grade');
    2649          }
    2650  
    2651          // it is a category or item
    2652          foreach ($this->levels as $row) {
    2653              foreach ($row as $element) {
    2654                  if ($element['type'] == 'filler') {
    2655                      continue;
    2656                  }
    2657                  if ($element['eid'] == $eid) {
    2658                      return $element;
    2659                  }
    2660              }
    2661          }
    2662  
    2663          return null;
    2664      }
    2665  
    2666      /**
    2667       * Returns a well-formed XML representation of the grade-tree using recursion.
    2668       *
    2669       * @param array  $root The current element in the recursion. If null, starts at the top of the tree.
    2670       * @param string $tabs The control character to use for tabs
    2671       *
    2672       * @return string $xml
    2673       */
    2674      public function exporttoxml($root=null, $tabs="\t") {
    2675          $xml = null;
    2676          $first = false;
    2677          if (is_null($root)) {
    2678              $root = $this->top_element;
    2679              $xml = '<?xml version="1.0" encoding="UTF-8" ?>' . "\n";
    2680              $xml .= "<gradetree>\n";
    2681              $first = true;
    2682          }
    2683  
    2684          $type = 'undefined';
    2685          if (strpos($root['object']->table, 'grade_categories') !== false) {
    2686              $type = 'category';
    2687          } else if (strpos($root['object']->table, 'grade_items') !== false) {
    2688              $type = 'item';
    2689          } else if (strpos($root['object']->table, 'grade_outcomes') !== false) {
    2690              $type = 'outcome';
    2691          }
    2692  
    2693          $xml .= "$tabs<element type=\"$type\">\n";
    2694          foreach ($root['object'] as $var => $value) {
    2695              if (!is_object($value) && !is_array($value) && !empty($value)) {
    2696                  $xml .= "$tabs\t<$var>$value</$var>\n";
    2697              }
    2698          }
    2699  
    2700          if (!empty($root['children'])) {
    2701              $xml .= "$tabs\t<children>\n";
    2702              foreach ($root['children'] as $sortorder => $child) {
    2703                  $xml .= $this->exportToXML($child, $tabs."\t\t");
    2704              }
    2705              $xml .= "$tabs\t</children>\n";
    2706          }
    2707  
    2708          $xml .= "$tabs</element>\n";
    2709  
    2710          if ($first) {
    2711              $xml .= "</gradetree>";
    2712          }
    2713  
    2714          return $xml;
    2715      }
    2716  
    2717      /**
    2718       * Returns a JSON representation of the grade-tree using recursion.
    2719       *
    2720       * @param array $root The current element in the recursion. If null, starts at the top of the tree.
    2721       * @param string $tabs Tab characters used to indent the string nicely for humans to enjoy
    2722       *
    2723       * @return string
    2724       */
    2725      public function exporttojson($root=null, $tabs="\t") {
    2726          $json = null;
    2727          $first = false;
    2728          if (is_null($root)) {
    2729              $root = $this->top_element;
    2730              $first = true;
    2731          }
    2732  
    2733          $name = '';
    2734  
    2735  
    2736          if (strpos($root['object']->table, 'grade_categories') !== false) {
    2737              $name = $root['object']->fullname;
    2738              if ($name == '?') {
    2739                  $name = $root['object']->get_name();
    2740              }
    2741          } else if (strpos($root['object']->table, 'grade_items') !== false) {
    2742              $name = $root['object']->itemname;
    2743          } else if (strpos($root['object']->table, 'grade_outcomes') !== false) {
    2744              $name = $root['object']->itemname;
    2745          }
    2746  
    2747          $json .= "$tabs {\n";
    2748          $json .= "$tabs\t \"type\": \"{$root['type']}\",\n";
    2749          $json .= "$tabs\t \"name\": \"$name\",\n";
    2750  
    2751          foreach ($root['object'] as $var => $value) {
    2752              if (!is_object($value) && !is_array($value) && !empty($value)) {
    2753                  $json .= "$tabs\t \"$var\": \"$value\",\n";
    2754              }
    2755          }
    2756  
    2757          $json = substr($json, 0, strrpos($json, ','));
    2758  
    2759          if (!empty($root['children'])) {
    2760              $json .= ",\n$tabs\t\"children\": [\n";
    2761              foreach ($root['children'] as $sortorder => $child) {
    2762                  $json .= $this->exportToJSON($child, $tabs."\t\t");
    2763              }
    2764              $json = substr($json, 0, strrpos($json, ','));
    2765              $json .= "\n$tabs\t]\n";
    2766          }
    2767  
    2768          if ($first) {
    2769              $json .= "\n}";
    2770          } else {
    2771              $json .= "\n$tabs},\n";
    2772          }
    2773  
    2774          return $json;
    2775      }
    2776  
    2777      /**
    2778       * Returns the array of levels
    2779       *
    2780       * @return array
    2781       */
    2782      public function get_levels() {
    2783          return $this->levels;
    2784      }
    2785  
    2786      /**
    2787       * Returns the array of grade items
    2788       *
    2789       * @return array
    2790       */
    2791      public function get_items() {
    2792          return $this->items;
    2793      }
    2794  
    2795      /**
    2796       * Returns a specific Grade Item
    2797       *
    2798       * @param int $itemid The ID of the grade_item object
    2799       *
    2800       * @return grade_item
    2801       */
    2802      public function get_item($itemid) {
    2803          if (array_key_exists($itemid, $this->items)) {
    2804              return $this->items[$itemid];
    2805          } else {
    2806              return false;
    2807          }
    2808      }
    2809  }
    2810  
    2811  /**
    2812   * Local shortcut function for creating an edit/delete button for a grade_* object.
    2813   * @param string $type 'edit' or 'delete'
    2814   * @param int $courseid The Course ID
    2815   * @param grade_* $object The grade_* object
    2816   * @return string html
    2817   */
    2818  function grade_button($type, $courseid, $object) {
    2819      global $CFG, $OUTPUT;
    2820      if (preg_match('/grade_(.*)/', get_class($object), $matches)) {
    2821          $objectidstring = $matches[1] . 'id';
    2822      } else {
    2823          throw new coding_exception('grade_button() only accepts grade_* objects as third parameter!');
    2824      }
    2825  
    2826      $strdelete = get_string('delete');
    2827      $stredit   = get_string('edit');
    2828  
    2829      if ($type == 'delete') {
    2830          $url = new moodle_url('index.php', array('id' => $courseid, $objectidstring => $object->id, 'action' => 'delete', 'sesskey' => sesskey()));
    2831      } else if ($type == 'edit') {
    2832          $url = new moodle_url('edit.php', array('courseid' => $courseid, 'id' => $object->id));
    2833      }
    2834  
    2835      return $OUTPUT->action_icon($url, new pix_icon('t/'.$type, ${'str'.$type}, '', array('class' => 'iconsmall')));
    2836  
    2837  }
    2838  
    2839  /**
    2840   * This method adds settings to the settings block for the grade system and its
    2841   * plugins
    2842   *
    2843   * @global moodle_page $PAGE
    2844   */
    2845  function grade_extend_settings($plugininfo, $courseid) {
    2846      global $PAGE;
    2847  
    2848      $gradenode = $PAGE->settingsnav->prepend(get_string('gradeadministration', 'grades'), null, navigation_node::TYPE_CONTAINER);
    2849  
    2850      $strings = array_shift($plugininfo);
    2851  
    2852      if ($reports = grade_helper::get_plugins_reports($courseid)) {
    2853          foreach ($reports as $report) {
    2854              $gradenode->add($report->string, $report->link, navigation_node::TYPE_SETTING, null, $report->id, new pix_icon('i/report', ''));
    2855          }
    2856      }
    2857  
    2858      if ($settings = grade_helper::get_info_manage_settings($courseid)) {
    2859          $settingsnode = $gradenode->add($strings['settings'], null, navigation_node::TYPE_CONTAINER);
    2860          foreach ($settings as $setting) {
    2861              $settingsnode->add($setting->string, $setting->link, navigation_node::TYPE_SETTING, null, $setting->id, new pix_icon('i/settings', ''));
    2862          }
    2863      }
    2864  
    2865      if ($imports = grade_helper::get_plugins_import($courseid)) {
    2866          $importnode = $gradenode->add($strings['import'], null, navigation_node::TYPE_CONTAINER);
    2867          foreach ($imports as $import) {
    2868              $importnode->add($import->string, $import->link, navigation_node::TYPE_SETTING, null, $import->id, new pix_icon('i/import', ''));
    2869          }
    2870      }
    2871  
    2872      if ($exports = grade_helper::get_plugins_export($courseid)) {
    2873          $exportnode = $gradenode->add($strings['export'], null, navigation_node::TYPE_CONTAINER);
    2874          foreach ($exports as $export) {
    2875              $exportnode->add($export->string, $export->link, navigation_node::TYPE_SETTING, null, $export->id, new pix_icon('i/export', ''));
    2876          }
    2877      }
    2878  
    2879      if ($letters = grade_helper::get_info_letters($courseid)) {
    2880          $letters = array_shift($letters);
    2881          $gradenode->add($strings['letter'], $letters->link, navigation_node::TYPE_SETTING, null, $letters->id, new pix_icon('i/settings', ''));
    2882      }
    2883  
    2884      if ($outcomes = grade_helper::get_info_outcomes($courseid)) {
    2885          $outcomes = array_shift($outcomes);
    2886          $gradenode->add($strings['outcome'], $outcomes->link, navigation_node::TYPE_SETTING, null, $outcomes->id, new pix_icon('i/outcomes', ''));
    2887      }
    2888  
    2889      if ($scales = grade_helper::get_info_scales($courseid)) {
    2890          $gradenode->add($strings['scale'], $scales->link, navigation_node::TYPE_SETTING, null, $scales->id, new pix_icon('i/scales', ''));
    2891      }
    2892  
    2893      if ($gradenode->contains_active_node()) {
    2894          // If the gradenode is active include the settings base node (gradeadministration) in
    2895          // the navbar, typcially this is ignored.
    2896          $PAGE->navbar->includesettingsbase = true;
    2897  
    2898          // If we can get the course admin node make sure it is closed by default
    2899          // as in this case the gradenode will be opened
    2900          if ($coursenode = $PAGE->settingsnav->get('courseadmin', navigation_node::TYPE_COURSE)){
    2901              $coursenode->make_inactive();
    2902              $coursenode->forceopen = false;
    2903          }
    2904      }
    2905  }
    2906  
    2907  /**
    2908   * Grade helper class
    2909   *
    2910   * This class provides several helpful functions that work irrespective of any
    2911   * current state.
    2912   *
    2913   * @copyright 2010 Sam Hemelryk
    2914   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
    2915   */
    2916  abstract class grade_helper {
    2917      /**
    2918       * Cached manage settings info {@see get_info_settings}
    2919       * @var grade_plugin_info|false
    2920       */
    2921      protected static $managesetting = null;
    2922      /**
    2923       * Cached grade report plugins {@see get_plugins_reports}
    2924       * @var array|false
    2925       */
    2926      protected static $gradereports = null;
    2927      /**
    2928       * Cached grade report plugins preferences {@see get_info_scales}
    2929       * @var array|false
    2930       */
    2931      protected static $gradereportpreferences = null;
    2932      /**
    2933       * Cached scale info {@see get_info_scales}
    2934       * @var grade_plugin_info|false
    2935       */
    2936      protected static $scaleinfo = null;
    2937      /**
    2938       * Cached outcome info {@see get_info_outcomes}
    2939       * @var grade_plugin_info|false
    2940       */
    2941      protected static $outcomeinfo = null;
    2942      /**
    2943       * Cached leftter info {@see get_info_letters}
    2944       * @var grade_plugin_info|false
    2945       */
    2946      protected static $letterinfo = null;
    2947      /**
    2948       * Cached grade import plugins {@see get_plugins_import}
    2949       * @var array|false
    2950       */
    2951      protected static $importplugins = null;
    2952      /**
    2953       * Cached grade export plugins {@see get_plugins_export}
    2954       * @var array|false
    2955       */
    2956      protected static $exportplugins = null;
    2957      /**
    2958       * Cached grade plugin strings
    2959       * @var array
    2960       */
    2961      protected static $pluginstrings = null;
    2962      /**
    2963       * Cached grade aggregation strings
    2964       * @var array
    2965       */
    2966      protected static $aggregationstrings = null;
    2967  
    2968      /**
    2969       * Gets strings commonly used by the describe plugins
    2970       *
    2971       * report => get_string('view'),
    2972       * scale => get_string('scales'),
    2973       * outcome => get_string('outcomes', 'grades'),
    2974       * letter => get_string('letters', 'grades'),
    2975       * export => get_string('export', 'grades'),
    2976       * import => get_string('import'),
    2977       * settings => get_string('settings')
    2978       *
    2979       * @return array
    2980       */
    2981      public static function get_plugin_strings() {
    2982          if (self::$pluginstrings === null) {
    2983              self::$pluginstrings = array(
    2984                  'report' => get_string('view'),
    2985                  'scale' => get_string('scales'),
    2986                  'outcome' => get_string('outcomes', 'grades'),
    2987                  'letter' => get_string('letters', 'grades'),
    2988                  'export' => get_string('export', 'grades'),
    2989                  'import' => get_string('import'),
    2990                  'settings' => get_string('edittree', 'grades')
    2991              );
    2992          }
    2993          return self::$pluginstrings;
    2994      }
    2995  
    2996      /**
    2997       * Gets strings describing the available aggregation methods.
    2998       *
    2999       * @return array
    3000       */
    3001      public static function get_aggregation_strings() {
    3002          if (self::$aggregationstrings === null) {
    3003              self::$aggregationstrings = array(
    3004                  GRADE_AGGREGATE_MEAN             => get_string('aggregatemean', 'grades'),
    3005                  GRADE_AGGREGATE_WEIGHTED_MEAN    => get_string('aggregateweightedmean', 'grades'),
    3006                  GRADE_AGGREGATE_WEIGHTED_MEAN2   => get_string('aggregateweightedmean2', 'grades'),
    3007                  GRADE_AGGREGATE_EXTRACREDIT_MEAN => get_string('aggregateextracreditmean', 'grades'),
    3008                  GRADE_AGGREGATE_MEDIAN           => get_string('aggregatemedian', 'grades'),
    3009                  GRADE_AGGREGATE_MIN              => get_string('aggregatemin', 'grades'),
    3010                  GRADE_AGGREGATE_MAX              => get_string('aggregatemax', 'grades'),
    3011                  GRADE_AGGREGATE_MODE             => get_string('aggregatemode', 'grades'),
    3012                  GRADE_AGGREGATE_SUM              => get_string('aggregatesum', 'grades')
    3013              );
    3014          }
    3015          return self::$aggregationstrings;
    3016      }
    3017  
    3018      /**
    3019       * Get grade_plugin_info object for managing settings if the user can
    3020       *
    3021       * @param int $courseid
    3022       * @return grade_plugin_info[]
    3023       */
    3024      public static function get_info_manage_settings($courseid) {
    3025          if (self::$managesetting !== null) {
    3026              return self::$managesetting;
    3027          }
    3028          $context = context_course::instance($courseid);
    3029          self::$managesetting = array();
    3030          if ($courseid != SITEID && has_capability('moodle/grade:manage', $context)) {
    3031              self::$managesetting['gradebooksetup'] = new grade_plugin_info('setup',
    3032                  new moodle_url('/grade/edit/tree/index.php', array('id' => $courseid)),
    3033                  get_string('gradebooksetup', 'grades'));
    3034              self::$managesetting['coursesettings'] = new grade_plugin_info('coursesettings',
    3035                  new moodle_url('/grade/edit/settings/index.php', array('id'=>$courseid)),
    3036                  get_string('coursegradesettings', 'grades'));
    3037          }
    3038          if (self::$gradereportpreferences === null) {
    3039              self::get_plugins_reports($courseid);
    3040          }
    3041          if (self::$gradereportpreferences) {
    3042              self::$managesetting = array_merge(self::$managesetting, self::$gradereportpreferences);
    3043          }
    3044          return self::$managesetting;
    3045      }
    3046      /**
    3047       * Returns an array of plugin reports as grade_plugin_info objects
    3048       *
    3049       * @param int $courseid
    3050       * @return array
    3051       */
    3052      public static function get_plugins_reports($courseid) {
    3053          global $SITE;
    3054  
    3055          if (self::$gradereports !== null) {
    3056              return self::$gradereports;
    3057          }
    3058          $context = context_course::instance($courseid);
    3059          $gradereports = array();
    3060          $gradepreferences = array();
    3061          foreach (core_component::get_plugin_list('gradereport') as $plugin => $plugindir) {
    3062              //some reports make no sense if we're not within a course
    3063              if ($courseid==$SITE->id && ($plugin=='grader' || $plugin=='user')) {
    3064                  continue;
    3065              }
    3066  
    3067              // Remove ones we can't see
    3068              if (!has_capability('gradereport/'.$plugin.':view', $context)) {
    3069                  continue;
    3070              }
    3071  
    3072              // Singleview doesn't doesn't accomodate for all cap combos yet, so this is hardcoded..
    3073              if ($plugin === 'singleview' && !has_all_capabilities(array('moodle/grade:viewall',
    3074                      'moodle/grade:edit'), $context)) {
    3075                  continue;
    3076              }
    3077  
    3078              $pluginstr = get_string('pluginname', 'gradereport_'.$plugin);
    3079              $url = new moodle_url('/grade/report/'.$plugin.'/index.php', array('id'=>$courseid));
    3080              $gradereports[$plugin] = new grade_plugin_info($plugin, $url, $pluginstr);
    3081  
    3082              // Add link to preferences tab if such a page exists
    3083              if (file_exists($plugindir.'/preferences.php')) {
    3084                  $url = new moodle_url('/grade/report/'.$plugin.'/preferences.php', array('id'=>$courseid));
    3085                  $gradepreferences[$plugin] = new grade_plugin_info($plugin, $url,
    3086                      get_string('preferences', 'grades') . ': ' . $pluginstr);
    3087              }
    3088          }
    3089          if (count($gradereports) == 0) {
    3090              $gradereports = false;
    3091              $gradepreferences = false;
    3092          } else if (count($gradepreferences) == 0) {
    3093              $gradepreferences = false;
    3094              asort($gradereports);
    3095          } else {
    3096              asort($gradereports);
    3097              asort($gradepreferences);
    3098          }
    3099          self::$gradereports = $gradereports;
    3100          self::$gradereportpreferences = $gradepreferences;
    3101          return self::$gradereports;
    3102      }
    3103  
    3104      /**
    3105       * Get information on scales
    3106       * @param int $courseid
    3107       * @return grade_plugin_info
    3108       */
    3109      public static function get_info_scales($courseid) {
    3110          if (self::$scaleinfo !== null) {
    3111              return self::$scaleinfo;
    3112          }
    3113          if (has_capability('moodle/course:managescales', context_course::instance($courseid))) {
    3114              $url = new moodle_url('/grade/edit/scale/index.php', array('id'=>$courseid));
    3115              self::$scaleinfo = new grade_plugin_info('scale', $url, get_string('view'));
    3116          } else {
    3117              self::$scaleinfo = false;
    3118          }
    3119          return self::$scaleinfo;
    3120      }
    3121      /**
    3122       * Get information on outcomes
    3123       * @param int $courseid
    3124       * @return grade_plugin_info
    3125       */
    3126      public static function get_info_outcomes($courseid) {
    3127          global $CFG, $SITE;
    3128  
    3129          if (self::$outcomeinfo !== null) {
    3130              return self::$outcomeinfo;
    3131          }
    3132          $context = context_course::instance($courseid);
    3133          $canmanage = has_capability('moodle/grade:manage', $context);
    3134          $canupdate = has_capability('moodle/course:update', $context);
    3135          if (!empty($CFG->enableoutcomes) && ($canmanage || $canupdate)) {
    3136              $outcomes = array();
    3137              if ($canupdate) {
    3138                  if ($courseid!=$SITE->id) {
    3139                      $url = new moodle_url('/grade/edit/outcome/course.php', array('id'=>$courseid));
    3140                      $outcomes['course'] = new grade_plugin_info('course', $url, get_string('outcomescourse', 'grades'));
    3141                  }
    3142                  $url = new moodle_url('/grade/edit/outcome/index.php', array('id'=>$courseid));
    3143                  $outcomes['edit'] = new grade_plugin_info('edit', $url, get_string('editoutcomes', 'grades'));
    3144                  $url = new moodle_url('/grade/edit/outcome/import.php', array('courseid'=>$courseid));
    3145                  $outcomes['import'] = new grade_plugin_info('import', $url, get_string('importoutcomes', 'grades'));
    3146              } else {
    3147                  if ($courseid!=$SITE->id) {
    3148                      $url = new moodle_url('/grade/edit/outcome/course.php', array('id'=>$courseid));
    3149                      $outcomes['edit'] = new grade_plugin_info('edit', $url, get_string('outcomescourse', 'grades'));
    3150                  }
    3151              }
    3152              self::$outcomeinfo = $outcomes;
    3153          } else {
    3154              self::$outcomeinfo = false;
    3155          }
    3156          return self::$outcomeinfo;
    3157      }
    3158      /**
    3159       * Get information on letters
    3160       * @param int $courseid
    3161       * @return array
    3162       */
    3163      public static function get_info_letters($courseid) {
    3164          global $SITE;
    3165          if (self::$letterinfo !== null) {
    3166              return self::$letterinfo;
    3167          }
    3168          $context = context_course::instance($courseid);
    3169          $canmanage = has_capability('moodle/grade:manage', $context);
    3170          $canmanageletters = has_capability('moodle/grade:manageletters', $context);
    3171          if ($canmanage || $canmanageletters) {
    3172              // Redirect to system context when report is accessed from admin settings MDL-31633
    3173              if ($context->instanceid == $SITE->id) {
    3174                  $param = array('edit' => 1);
    3175              } else {
    3176                  $param = array('edit' => 1,'id' => $context->id);
    3177              }
    3178              self::$letterinfo = array(
    3179                  'view' => new grade_plugin_info('view', new moodle_url('/grade/edit/letter/index.php', array('id'=>$context->id)), get_string('view')),
    3180                  'edit' => new grade_plugin_info('edit', new moodle_url('/grade/edit/letter/index.php', $param), get_string('edit'))
    3181              );
    3182          } else {
    3183              self::$letterinfo = false;
    3184          }
    3185          return self::$letterinfo;
    3186      }
    3187      /**
    3188       * Get information import plugins
    3189       * @param int $courseid
    3190       * @return array
    3191       */
    3192      public static function get_plugins_import($courseid) {
    3193          global $CFG;
    3194  
    3195          if (self::$importplugins !== null) {
    3196              return self::$importplugins;
    3197          }
    3198          $importplugins = array();
    3199          $context = context_course::instance($courseid);
    3200  
    3201          if (has_capability('moodle/grade:import', $context)) {
    3202              foreach (core_component::get_plugin_list('gradeimport') as $plugin => $plugindir) {
    3203                  if (!has_capability('gradeimport/'.$plugin.':view', $context)) {
    3204                      continue;
    3205                  }
    3206                  $pluginstr = get_string('pluginname', 'gradeimport_'.$plugin);
    3207                  $url = new moodle_url('/grade/import/'.$plugin.'/index.php', array('id'=>$courseid));
    3208                  $importplugins[$plugin] = new grade_plugin_info($plugin, $url, $pluginstr);
    3209              }
    3210  
    3211              // Show key manager if grade publishing is enabled and the user has xml publishing capability.
    3212              // XML is the only grade import plugin that has publishing feature.
    3213              if ($CFG->gradepublishing && has_capability('gradeimport/xml:publish', $context)) {
    3214                  $url = new moodle_url('/grade/import/keymanager.php', array('id'=>$courseid));
    3215                  $importplugins['keymanager'] = new grade_plugin_info('keymanager', $url, get_string('keymanager', 'grades'));
    3216              }
    3217          }
    3218  
    3219          if (count($importplugins) > 0) {
    3220              asort($importplugins);
    3221              self::$importplugins = $importplugins;
    3222          } else {
    3223              self::$importplugins = false;
    3224          }
    3225          return self::$importplugins;
    3226      }
    3227      /**
    3228       * Get information export plugins
    3229       * @param int $courseid
    3230       * @return array
    3231       */
    3232      public static function get_plugins_export($courseid) {
    3233          global $CFG;
    3234  
    3235          if (self::$exportplugins !== null) {
    3236              return self::$exportplugins;
    3237          }
    3238          $context = context_course::instance($courseid);
    3239          $exportplugins = array();
    3240          $canpublishgrades = 0;
    3241          if (has_capability('moodle/grade:export', $context)) {
    3242              foreach (core_component::get_plugin_list('gradeexport') as $plugin => $plugindir) {
    3243                  if (!has_capability('gradeexport/'.$plugin.':view', $context)) {
    3244                      continue;
    3245                  }
    3246                  // All the grade export plugins has grade publishing capabilities.
    3247                  if (has_capability('gradeexport/'.$plugin.':publish', $context)) {
    3248                      $canpublishgrades++;
    3249                  }
    3250  
    3251                  $pluginstr = get_string('pluginname', 'gradeexport_'.$plugin);
    3252                  $url = new moodle_url('/grade/export/'.$plugin.'/index.php', array('id'=>$courseid));
    3253                  $exportplugins[$plugin] = new grade_plugin_info($plugin, $url, $pluginstr);
    3254              }
    3255  
    3256              // Show key manager if grade publishing is enabled and the user has at least one grade publishing capability.
    3257              if ($CFG->gradepublishing && $canpublishgrades != 0) {
    3258                  $url = new moodle_url('/grade/export/keymanager.php', array('id'=>$courseid));
    3259                  $exportplugins['keymanager'] = new grade_plugin_info('keymanager', $url, get_string('keymanager', 'grades'));
    3260              }
    3261          }
    3262          if (count($exportplugins) > 0) {
    3263              asort($exportplugins);
    3264              self::$exportplugins = $exportplugins;
    3265          } else {
    3266              self::$exportplugins = false;
    3267          }
    3268          return self::$exportplugins;
    3269      }
    3270  
    3271      /**
    3272       * Returns the value of a field from a user record
    3273       *
    3274       * @param stdClass $user object
    3275       * @param stdClass $field object
    3276       * @return string value of the field
    3277       */
    3278      public static function get_user_field_value($user, $field) {
    3279          if (!empty($field->customid)) {
    3280              $fieldname = 'customfield_' . $field->customid;
    3281              if (!empty($user->{$fieldname}) || is_numeric($user->{$fieldname})) {
    3282                  $fieldvalue = $user->{$fieldname};
    3283              } else {
    3284                  $fieldvalue = $field->default;
    3285              }
    3286          } else {
    3287              $fieldvalue = $user->{$field->shortname};
    3288          }
    3289          return $fieldvalue;
    3290      }
    3291  
    3292      /**
    3293       * Returns an array of user profile fields to be included in export
    3294       *
    3295       * @param int $courseid
    3296       * @param bool $includecustomfields
    3297       * @return array An array of stdClass instances with customid, shortname, datatype, default and fullname fields
    3298       */
    3299      public static function get_user_profile_fields($courseid, $includecustomfields = false) {
    3300          global $CFG, $DB;
    3301  
    3302          // Gets the fields that have to be hidden
    3303          $hiddenfields = array_map('trim', explode(',', $CFG->hiddenuserfields));
    3304          $context = context_course::instance($courseid);
    3305          $canseehiddenfields = has_capability('moodle/course:viewhiddenuserfields', $context);
    3306          if ($canseehiddenfields) {
    3307              $hiddenfields = array();
    3308          }
    3309  
    3310          $fields = array();
    3311          require_once($CFG->dirroot.'/user/lib.php');                // Loads user_get_default_fields()
    3312          require_once($CFG->dirroot.'/user/profile/lib.php');        // Loads constants, such as PROFILE_VISIBLE_ALL
    3313          $userdefaultfields = user_get_default_fields();
    3314  
    3315          // Sets the list of profile fields
    3316          $userprofilefields = array_map('trim', explode(',', $CFG->grade_export_userprofilefields));
    3317          if (!empty($userprofilefields)) {
    3318              foreach ($userprofilefields as $field) {
    3319                  $field = trim($field);
    3320                  if (in_array($field, $hiddenfields) || !in_array($field, $userdefaultfields)) {
    3321                      continue;
    3322                  }
    3323                  $obj = new stdClass();
    3324                  $obj->customid  = 0;
    3325                  $obj->shortname = $field;
    3326                  $obj->fullname  = get_string($field);
    3327                  $fields[] = $obj;
    3328              }
    3329          }
    3330  
    3331          // Sets the list of custom profile fields
    3332          $customprofilefields = array_map('trim', explode(',', $CFG->grade_export_customprofilefields));
    3333          if ($includecustomfields && !empty($customprofilefields)) {
    3334              $customfields = profile_get_user_fields_with_data(0);
    3335  
    3336              foreach ($customfields as $fieldobj) {
    3337                  $field = (object)$fieldobj->get_field_config_for_external();
    3338                  // Make sure we can display this custom field
    3339                  if (!in_array($field->shortname, $customprofilefields)) {
    3340                      continue;
    3341                  } else if (in_array($field->shortname, $hiddenfields)) {
    3342                      continue;
    3343                  } else if ($field->visible != PROFILE_VISIBLE_ALL && !$canseehiddenfields) {
    3344                      continue;
    3345                  }
    3346  
    3347                  $obj = new stdClass();
    3348                  $obj->customid  = $field->id;
    3349                  $obj->shortname = $field->shortname;
    3350                  $obj->fullname  = format_string($field->name);
    3351                  $obj->datatype  = $field->datatype;
    3352                  $obj->default   = $field->defaultdata;
    3353                  $fields[] = $obj;
    3354              }
    3355          }
    3356  
    3357          return $fields;
    3358      }
    3359  
    3360      /**
    3361       * This helper method gets a snapshot of all the weights for a course.
    3362       * It is used as a quick method to see if any wieghts have been automatically adjusted.
    3363       * @param int $courseid
    3364       * @return array of itemid -> aggregationcoef2
    3365       */
    3366      public static function fetch_all_natural_weights_for_course($courseid) {
    3367          global $DB;
    3368          $result = array();
    3369  
    3370          $records = $DB->get_records('grade_items', array('courseid'=>$courseid), 'id', 'id, aggregationcoef2');
    3371          foreach ($records as $record) {
    3372              $result[$record->id] = $record->aggregationcoef2;
    3373          }
    3374          return $result;
    3375      }
    3376  }
    3377