<?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/>.

/**
 * MoePlayer 播放器 media 插件
 *
 * 把页面中的视频链接/嵌入媒体交给 MoePlayer 渲染。
 * 播放器资源(js/css/语言包/解码库)随插件打包,无需额外部署。
 *
 * @package    media_moeplayer
 * @copyright  MoePlayer 项目(fork 自 ckplayer, www.ckplayer.com)
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

/**
 * MoePlayer media 插件类
 */
class media_moeplayer_plugin extends core_media_player {

    /** @var array 支持的扩展名 */
    private static $extensions = ['mp4', 'm4v', 'mov', 'webm', 'ogv', 'm3u8', 'flv', 'ts'];

    /**
     * 支持的扩展名列表(core_media_manager 据此匹配视频链接)
     *
     * @return array
     */
    public function get_supported_extensions() {
        return self::$extensions;
    }

    /**
     * 优先级,高于内置 html5video/videojs,使 MoePlayer 优先接管
     *
     * @return int
     */
    public function get_rank() {
        return 100;
    }

    /**
     * 生成嵌入代码
     *
     * @param array $urls 媒体 URL 列表(moodle_url)
     * @param string $name 名称
     * @param int $width 宽度
     * @param int $height 高度
     * @param array $options 选项
     * @return string HTML
     */
    public function embed($urls, $name, $width, $height, $options) {
        global $PAGE;

        // 页面只需加载一次播放器资源(多视频共存时去重)
        static $loaded = false;
        if (!$loaded) {
            $base = new moodle_url('/media/player/moeplayer/moeplayer');
            $skin = get_config('media_moeplayer', 'skin');
            if (!in_array($skin, ['moeplayer.css', 'moeplayer.red.css', 'moeplayer.ixigua.css'])) {
                $skin = 'moeplayer.css';
            }
            $PAGE->requires->css($base . '/css/' . $skin);
            $PAGE->requires->js($base . '/js/moeplayer.min.js', true);
            $loaded = true;
        }

        $videourl = addslashes($urls[0]->out(false));
        $id = html_writer::random_id('moeplayer_');

        // 尺寸:优先使用管理器传入值,其次插件默认设置
        $width  = $width  ?: get_config('media_moeplayer', 'width')  ?: '100%';
        $height = $height ?: get_config('media_moeplayer', 'height') ?: '480';

        $container = html_writer::tag('div', '', [
            'id'    => $id,
            'class' => 'media-moeplayer',
            'style' => 'width:' . (is_numeric($width) ? $width . 'px' : $width) . ';'
                     . 'height:' . (is_numeric($height) ? $height . 'px' : $height) . ';max-width:100%;',
        ]);

        // 等播放器 js 就绪后初始化(handlebars/JS 过滤等场景下加载顺序不确定)
        $script = html_writer::script("
            (function() {
                var init = function() {
                    if (typeof MoePlayer === 'undefined') {
                        return setTimeout(init, 50);
                    }
                    new MoePlayer({
                        container: '#{$id}',
                        video: '{$videourl}'
                    });
                };
                init();
            })();
        ");

        return $container . $script;
    }
}