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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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/**
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 * Contains the base class for fetching the important dates in an activity module for a given module instance and a user.
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 *
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 * @package   core
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 * @copyright Shamim Rezaie <shamim@moodle.com>
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 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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declare(strict_types=1);
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namespace core;
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use cm_info;
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/**
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 * Class for fetching the  important dates of an activity module for a given module instance and a user.
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 *
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 * @copyright Shamim Rezaie <shamim@moodle.com>
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 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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abstract class activity_dates {
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    /**
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     * @var cm_info The course module information object.
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     */
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    protected $cm;
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    /**
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     * @var int The user id.
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     */
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    protected $userid;
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    /**
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     * activity_dates constructor.
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     *
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     * @param cm_info $cm course module
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     * @param int $userid user id
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     */
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    public function __construct(cm_info $cm, int $userid) {
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        $this->cm = $cm;
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        $this->userid = $userid;
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    }
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    /**
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     * Returns a list of important dates in the given module for the user.
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     *
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     * @param cm_info $cm The course module information.
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     * @param int $userid The user ID.
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     * @return array|array[]
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     */
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    public static function get_dates_for_module(cm_info $cm, int $userid): array {
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        $cmdatesclassname = static::get_dates_classname($cm->modname);
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        if (!$cmdatesclassname) {
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            return [];
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        }
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        /** @var activity_dates $dates */
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        $dates = new $cmdatesclassname($cm, $userid);
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        return $dates->get_dates();
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    }
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    /**
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     * Fetches the module's dates class implementation if it's available.
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     *
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     * @param string $modname The activity module name. Usually from cm_info::modname.
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     * @return string|null
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     */
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    private static function get_dates_classname(string $modname): ?string {
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        $cmdatesclass = "mod_{$modname}\\dates";
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        if (class_exists($cmdatesclass) && is_subclass_of($cmdatesclass, self::class)) {
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            return $cmdatesclass;
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        }
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        return null;
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    }
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    /**
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     * Returns a list of important dates for this module.
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     *
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     * @return array[] Each element of the array is an array with keys:
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     *                 label - The label for the date
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     *                 timestamp - The date
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     */
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    abstract protected function get_dates(): array;
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}