<?php
namespace app\mobile\model;

use think\Model;

class CourseCatalog extends Model
{
	// 表名
    protected $name = 'mobile_course_catalog';
    // 开启自动写入时间戳字段
    protected $autoWriteTimestamp = 'int';
    // 定义时间戳字段名
    protected $createTime = 'createtime';
    protected $updateTime = 'updatetime';

    // 获取视频解析封面和地址
    public function getVideoAttr($value,$data){
        if(empty($value)){
            return [];
        }
        // 获取网络视频信息
        if(preg_match("/^http(s)?:\\/\\/.+/",$value)){
            return [
                'cover' => request()->domain().'/assets/img/bg-middle.jpg',
                'video' => $value
            ];
        }
        // 获取七牛云视频信息
        $video = cdnurl($value,true);
        $video_info = json_decode(file_get_contents($video.'?avinfo'),true);
        return [
            'cover' => $this->getCoverImagesQiniu($video,$video_info),
            'video' => $video
        ];
    }

    // 获取七牛云视频的封面图
    public function getCoverImagesQiniu($video_url,$video_info){
        if(empty($video_info['streams'][0]['width'])) {
            $width = $video_info['streams'][1]['width'];
            $height = $video_info['streams'][1]['height'];
        } else {
            $width = $video_info['streams'][0]['width'];
            $height = $video_info['streams'][0]['height'];
        }
        return $video_url.'?vframe/jpg/offset/1/w/'.$width.'/h/'.$height;
    }
}