<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Web services relating to fetching of a marking guide for the grading panel.
 *
 * @package    gradingform_guide
 * @copyright  2019 Andrew Nicols <andrew@nicols.co.uk>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

declare(strict_types = 1);

namespace gradingform_guide\grades\grader\gradingpanel\external;

global $CFG;

use coding_exception;
use context;
use core_user;
use core_grades\component_gradeitem as gradeitem;
use core_grades\component_gradeitems;
use external_api;
use external_format_value;
use external_function_parameters;
use external_multiple_structure;
use external_single_structure;
use external_value;
use external_warnings;
use moodle_exception;
use stdClass;
require_once($CFG->dirroot.'/grade/grading/form/guide/lib.php');

/**
 * Web services relating to fetching of a marking guide for the grading panel.
 *
 * @package    gradingform_guide
 * @copyright  2019 Andrew Nicols <andrew@nicols.co.uk>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class fetch extends external_api {

    /**
     * Describes the parameters for fetching the grading panel for a simple grade.
     *
     * @return external_function_parameters
     * @since Moodle 3.8
     */
    public static function execute_parameters(): external_function_parameters {
        return new external_function_parameters ([
            'component' => new external_value(
                PARAM_ALPHANUMEXT,
                'The name of the component',
                VALUE_REQUIRED
            ),
            'contextid' => new external_value(
                PARAM_INT,
                'The ID of the context being graded',
                VALUE_REQUIRED
            ),
            'itemname' => new external_value(
                PARAM_ALPHANUM,
                'The grade item itemname being graded',
                VALUE_REQUIRED
            ),
            'gradeduserid' => new external_value(
                PARAM_INT,
                'The ID of the user show',
                VALUE_REQUIRED
            ),
        ]);
    }

    /**
     * Fetch the data required to build a grading panel for a simple grade.
     *
     * @param string $component
     * @param int $contextid
     * @param string $itemname
     * @param int $gradeduserid
     * @return array
     * @throws \dml_exception
     * @throws \invalid_parameter_exception
     * @throws \restricted_context_exception
     * @throws coding_exception
     * @throws moodle_exception
     * @since Moodle 3.8
     */
    public static function execute(string $component, int $contextid, string $itemname, int $gradeduserid): array {
        global $CFG, $USER;
        require_once("{$CFG->libdir}/gradelib.php");
        [
            'component' => $component,
            'contextid' => $contextid,
            'itemname' => $itemname,
            'gradeduserid' => $gradeduserid,
        ] = self::validate_parameters(self::execute_parameters(), [
            'component' => $component,
            'contextid' => $contextid,
            'itemname' => $itemname,
            'gradeduserid' => $gradeduserid,
        ]);

        // Validate the context.
        $context = context::instance_by_id($contextid);
        self::validate_context($context);

        // Validate that the supplied itemname is a gradable item.
        if (!component_gradeitems::is_valid_itemname($component, $itemname)) {
            throw new coding_exception("The '{$itemname}' item is not valid for the '{$component}' component");
        }

        // Fetch the gradeitem instance.
        $gradeitem = gradeitem::instance($component, $context, $itemname);

        if (MARKING_GUIDE !== $gradeitem->get_advanced_grading_method()) {
            throw new moodle_exception(
                "The {$itemname} item in {$component}/{$contextid} is not configured for advanced grading with a marking guide"
            );
        }

        // Fetch the actual data.
        $gradeduser = core_user::get_user($gradeduserid, '*', MUST_EXIST);

        // One can access its own grades. Others just if they're graders.
        if ($gradeduserid != $USER->id) {
            $gradeitem->require_user_can_grade($gradeduser, $USER);
        }

        return self::get_fetch_data($gradeitem, $gradeduser);
    }

    /**
     * Get the data to be fetched.
     *
     * @param gradeitem $gradeitem
     * @param stdClass $gradeduser
     * @return array
     */
    public static function get_fetch_data(gradeitem $gradeitem, stdClass $gradeduser): array {
        global $USER;

        $hasgrade = $gradeitem->user_has_grade($gradeduser);

<         $grade = $gradeitem->get_grade_for_user($gradeduser, $USER);



>         $grade = $gradeitem->get_formatted_grade_for_user($gradeduser, $USER);


        $instance = $gradeitem->get_advanced_grading_instance($USER, $grade);
        if (!$instance) {
            throw new moodle_exception('error:gradingunavailable', 'grading');
        }
        $controller = $instance->get_controller();
        $definition = $controller->get_definition();
        $fillings = $instance->get_guide_filling();
        $context = $controller->get_context();
        $definitionid = (int) $definition->id;

        // Set up some items we need to return on other interfaces.
        $gradegrade = \grade_grade::fetch(['itemid' => $gradeitem->get_grade_item()->id, 'userid' => $gradeduser->id]);
        $gradername = $gradegrade ? fullname(\core_user::get_user($gradegrade->usermodified)) : null;
        $maxgrade = max(array_keys($controller->get_grade_range()));

        $criterion = [];
        if ($definition->guide_criteria) {
            $criterion = array_map(function($criterion) use ($definitionid, $fillings, $context) {
                $result = [
                    'id' => $criterion['id'],
                    'name' => $criterion['shortname'],
                    'maxscore' => $criterion['maxscore'],
                    'description' => self::get_formatted_text(
                        $context,
                        $definitionid,
                        'description',
                        $criterion['description'],
                        (int) $criterion['descriptionformat']
                    ),
                    'descriptionmarkers' => self::get_formatted_text(
                        $context,
                        $definitionid,
                        'descriptionmarkers',
                        $criterion['descriptionmarkers'],
                        (int) $criterion['descriptionmarkersformat']
                    ),
                    'score' => null,
                    'remark' => null,
                ];

                if (array_key_exists($criterion['id'], $fillings['criteria'])) {
                    $filling = $fillings['criteria'][$criterion['id']];

                    $result['score'] = $filling['score'];
                    $result['remark'] = self::get_formatted_text(
                        $context,
                        $definitionid,
                        'remark',
                        $filling['remark'],
                        (int) $filling['remarkformat']
                    );
                }

                return $result;
            }, $definition->guide_criteria);
        }

        $comments = [];
        if ($definition->guide_comments) {
            $comments = array_map(function($comment) use ($definitionid, $context) {
                return [
                    'id' => $comment['id'],
                    'sortorder' => $comment['sortorder'],
                    'description' => self::get_formatted_text(
                        $context,
                        $definitionid,
                        'description',
                        $comment['description'],
                        (int) $comment['descriptionformat']
                    ),
                ];
            }, $definition->guide_comments);
        }

        return [
            'templatename' => 'gradingform_guide/grades/grader/gradingpanel',
            'hasgrade' => $hasgrade,
            'grade' => [
                'instanceid' => $instance->get_id(),
                'criterion' => $criterion,
                'hascomments' => !empty($comments),
                'comments' => $comments,

<                 'usergrade' => $grade->grade,



>                 'usergrade' => $grade->usergrade,


                'maxgrade' => $maxgrade,
                'gradedby' => $gradername,
                'timecreated' => $grade->timecreated,
                'timemodified' => $grade->timemodified,
            ],
            'warnings' => [],
        ];
    }

    /**
     * Describes the data returned from the external function.
     *
     * @return external_single_structure
     * @since Moodle 3.8
     */
    public static function execute_returns(): external_single_structure {
        return new external_single_structure([
            'templatename' => new external_value(PARAM_SAFEPATH, 'The template to use when rendering this data'),
            'hasgrade' => new external_value(PARAM_BOOL, 'Does the user have a grade?'),
            'grade' => new external_single_structure([
                'instanceid' => new external_value(PARAM_INT, 'The id of the current grading instance'),
                'criterion' => new external_multiple_structure(
                    new external_single_structure([
                        'id' => new external_value(PARAM_INT, 'The id of the criterion'),
                        'name' => new external_value(PARAM_RAW, 'The name of the criterion'),
                        'maxscore' => new external_value(PARAM_FLOAT, 'The maximum score for this criterion'),
                        'description' => new external_value(PARAM_RAW, 'The description of the criterion'),
                        'descriptionmarkers' => new external_value(PARAM_RAW, 'The description of the criterion for markers'),
                        'score' => new external_value(PARAM_FLOAT, 'The current score for user being assessed', VALUE_OPTIONAL),
                        'remark' => new external_value(PARAM_RAW, 'Any remarks for this criterion for the user being assessed', VALUE_OPTIONAL),
                    ]),
                    'The criterion by which this item will be graded'
                ),
                'hascomments' => new external_value(PARAM_BOOL, 'Whether there are any frequently-used comments'),
                'comments' => new external_multiple_structure(
                    new external_single_structure([
                        'id' => new external_value(PARAM_INT, 'Comment id'),
                        'sortorder' => new external_value(PARAM_INT, 'The sortorder of this comment'),
                        'description' => new external_value(PARAM_RAW, 'The comment value'),
                    ]),
                    'Frequently used comments'
                ),
                'usergrade' => new external_value(PARAM_RAW, 'Current user grade'),
                'maxgrade' => new external_value(PARAM_RAW, 'Max possible grade'),
                'gradedby' => new external_value(PARAM_RAW, 'The assumed grader of this grading instance'),
                'timecreated' => new external_value(PARAM_INT, 'The time that the grade was created'),
                'timemodified' => new external_value(PARAM_INT, 'The time that the grade was last updated'),
            ]),
            'warnings' => new external_warnings(),
        ]);
    }

    /**
     * Get a formatted version of the remark/description/etc.
     *
     * @param context $context
     * @param int $definitionid
     * @param string $filearea The file area of the field
     * @param string $text The text to be formatted
     * @param int $format The input format of the string
     * @return string
     */
    protected static function get_formatted_text(context $context, int $definitionid, string $filearea, string $text, int $format): string {
        $formatoptions = [
            'noclean' => false,
            'trusted' => false,
            'filter' => true,
        ];

        [$newtext, ] = external_format_text($text, $format, $context, 'grading', $filearea, $definitionid, $formatoptions);

        return $newtext;
    }
}