<?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/>.


< /**
<  * Event documentation
<  *
<  * @package    tool_monitor
<  * @copyright  2014 onwards Ankit Agarwal <ankit.agrr@gmail.com>
<  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
<  */



namespace tool_monitor;


< defined('MOODLE_INTERNAL') || die();



> use core_component;
> use ReflectionClass;



/**
 * Class for returning event information.
 *
 * @since      Moodle 2.8
 * @package    tool_monitor
 * @copyright  2014 onwards Ankit Agarwal <ankit.agrr@gmail.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class eventlist {

<     /**
<      * Return all of the core event files.
<      *
<      * @return array Core events.
<      */
<     protected static function get_core_eventlist() {
<         global $CFG;
< 
<         // Disable developer debugging as deprecated events will fire warnings.
<         // Setup backup variables to restore the following settings back to what they were when we are finished.
<         $debuglevel          = $CFG->debug;
<         $debugdisplay        = $CFG->debugdisplay;
<         $debugdeveloper      = $CFG->debugdeveloper;
<         $CFG->debug          = 0;
<         $CFG->debugdisplay   = false;
<         $CFG->debugdeveloper = false;
< 
<         $eventinformation = array();
<         $directory = $CFG->libdir . '/classes/event';
<         $files = self::get_file_list($directory);
< 
<         // Remove exceptional events that will cause problems being displayed.
<         if (isset($files['unknown_logged'])) {
<             unset($files['unknown_logged']);
<         }
<         foreach ($files as $file => $location) {
<             $classname = '\\core\\event\\' . $file;
<             // Check to see if this is actually a valid event.
<             if (method_exists($classname, 'get_static_info')) {
<                 $ref = new \ReflectionClass($classname);
<                 // Ignore abstracts.
<                 if (!$ref->isAbstract() && $file != 'manager') {
<                     $eventinformation[$classname] = $classname::get_name_with_info();
<                 }
<             }
<         }
<         // Now enable developer debugging as event information has been retrieved.
<         $CFG->debug          = $debuglevel;
<         $CFG->debugdisplay   = $debugdisplay;
<         $CFG->debugdeveloper = $debugdeveloper;
<         return $eventinformation;
<     }



    /**

<      * This function returns an array of all events for the plugins of the system.



>      * Get a list of events present in the system.


     *
     * @param bool $withoutcomponent Return an eventlist without associated components.
     *

<      * @return array A list of events from all plug-ins.



>      * @return array list of events present in the system.


     */

<     protected static function get_non_core_eventlist($withoutcomponent = false) {



>     public static function get_all_eventlist($withoutcomponent = false) {


        global $CFG;

> 


        // Disable developer debugging as deprecated events will fire warnings.
        // Setup backup variables to restore the following settings back to what they were when we are finished.
        $debuglevel          = $CFG->debug;
        $debugdisplay        = $CFG->debugdisplay;
        $debugdeveloper      = $CFG->debugdeveloper;
        $CFG->debug          = 0;
        $CFG->debugdisplay   = false;
        $CFG->debugdeveloper = false;


<         $noncorepluginlist = array();
<         $plugintypes = \core_component::get_plugin_types();
<         foreach ($plugintypes as $plugintype => $notused) {
<             $pluginlist = \core_component::get_plugin_list($plugintype);
<             foreach ($pluginlist as $plugin => $directory) {
<                 $plugindirectory = $directory . '/classes/event';
<                 foreach (self::get_file_list($plugindirectory) as $eventname => $notused) {
<                     $fullpluginname = $plugintype . '_' . $plugin;
<                     $plugineventname = '\\' . $fullpluginname . '\\event\\' . $eventname;
<                     // Check that this is actually an event.
<                     if (method_exists($plugineventname, 'get_static_info')  && $fullpluginname !== 'tool_monitor') { // No selfie here.
<                         $ref = new \ReflectionClass($plugineventname);
<                         if (!$ref->isAbstract() && $fullpluginname !== 'logstore_legacy') {



>         // List of exceptional events that will cause problems if displayed.
>         $eventsignore = [
>             \core\event\unknown_logged::class,
>             \logstore_legacy\event\legacy_logged::class,
>         ];
> 
>         $return = [];
> 
>         $events = core_component::get_component_classes_in_namespace(null, 'event');
>         foreach (array_keys($events) as $event) {
>             // We need to filter all classes that extend event base, or the base class itself.
>             if (is_a($event, \core\event\base::class, true) && !in_array($event, $eventsignore)) {
> 
>                 $reflectionclass = new ReflectionClass($event);
>                 if ($reflectionclass->isAbstract()) {
>                     continue;
>                 }
> 
>                 // We can't choose this component's own events.
>                 [$component] = explode('\\', $event);
>                 if ($component === 'tool_monitor') {
>                     continue;
>                 }
> 


                            if ($withoutcomponent) {

<                                 $noncorepluginlist[$plugineventname] = $plugineventname::get_name_with_info();



>                     $return["\\{$event}"] = $event::get_name_with_info();


                            } else {

<                                 $noncorepluginlist[$fullpluginname][$plugineventname] = $plugineventname::get_name_with_info();
<                             }
<                         }
<                     }



>                     $return[$component]["\\{$event}"] = $event::get_name_with_info();


                }
            }
        }

        // Now enable developer debugging as event information has been retrieved.
        $CFG->debug          = $debuglevel;
        $CFG->debugdisplay   = $debugdisplay;
        $CFG->debugdeveloper = $debugdeveloper;


<         return $noncorepluginlist;
<     }
< 
<     /**
<      * Returns a list of files with a full directory path in a specified directory.
<      *
<      * @param string $directory location of files.
<      * @return array full location of files from the specified directory.
<      */
<     protected static function get_file_list($directory) {
<         global $CFG;
<         $directoryroot = $CFG->dirroot;
<         $finalfiles = array();
<         if (is_dir($directory)) {
<             if ($handle = opendir($directory)) {
<                 $files = scandir($directory);
<                 foreach ($files as $file) {
<                     if ($file != '.' && $file != '..') {
<                         // Ignore the file if it is external to the system.
<                         if (strrpos($directory, $directoryroot) !== false) {
<                             $location = substr($directory, strlen($directoryroot));
<                             $name = substr($file, 0, -4);
<                             $finalfiles[$name] = $location  . '/' . $file;
<                         }
<                     }
<                 }
<             }
<         }
<         return $finalfiles;
<     }
< 
<     /**
<      * Get a list of events present in the system.
<      *
<      * @param bool $withoutcomponent Return an eventlist without associated components.
<      *
<      * @return array list of events present in the system.
<      */
<     public static function get_all_eventlist($withoutcomponent = false) {


        if ($withoutcomponent) {

<             $return = array_merge(self::get_core_eventlist(), self::get_non_core_eventlist($withoutcomponent));


            array_multisort($return, SORT_NATURAL);

<         } else {
<             $return = array_merge(array('core' => self::get_core_eventlist()),
<                     self::get_non_core_eventlist($withoutcomponent = false));


        }

> 


        return $return;
    }

    /**
     * Return list of plugins that have events.
     *
     * @param array $eventlist a list of events present in the system {@link eventlist::get_all_eventlist}.
     *
     * @return array list of plugins with human readable name.
     */
    public static function get_plugin_list($eventlist = array()) {
        if (empty($eventlist)) {
            $eventlist = self::get_all_eventlist();
        }
        $plugins = array_keys($eventlist);
        $return = array();
        foreach ($plugins as $plugin) {
            if ($plugin === 'core') {
                $return[$plugin] = get_string('core', 'tool_monitor');
            } else if (get_string_manager()->string_exists('pluginname', $plugin)) {
                $return[$plugin] = get_string('pluginname', $plugin);
            } else {
                $return[$plugin] = $plugin;
            }
        }

        return $return;
    }

    /**
     * validate if the given event belongs to the given plugin.
     *
     * @param string $plugin Frankenstyle name of the plugin.
     * @param string $eventname Full qualified event name.
     * @param array $eventlist List of events generated by {@link eventlist::get_all_eventlist}
     *
     * @return bool Returns true if the selected event belongs to the selected plugin, false otherwise.
     */
    public static function validate_event_plugin($plugin, $eventname, $eventlist = array()) {
        if (empty($eventlist)) {
            $eventlist = self::get_all_eventlist();
        }
        if (isset($eventlist[$plugin][$eventname])) {
            return true;
        }

        return false;
    }
}