<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Casts\Attribute;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

/**
 * @property int $id
 * @property int $order
 * @property string $link
 * @property string $video_link
 * @property integer $video_size
 * @property string $title
 * @property string $duration
 * @property integer $course_id
 * @property bool $sync_offline
 * @property string $video_path
 * @property string $directory_path
 * @property Course $course
 */
class Chapter extends Model
{
    use HasFactory;

    protected $fillable = [
        'order',
        'link',
        'video_link',
        'video_size',
        'title',
        'duration',
        'course_id',
        'sync_offline',
    ];

    protected $appends = ['video_path', 'directory_path'];

    public function course(): BelongsTo
    {
        return $this->belongsTo(Course::class);
    }

    protected function videoPath(): Attribute
    {
        return Attribute::make(
            get: fn() => $this->directory_path . '/' . $this->order . '.mp4'
        );
    }

    protected function directoryPath(): Attribute
    {
        return Attribute::make(
            get: fn() => public_path($this->course_id)
        );
    }

    protected function isVideoFile(): Attribute
    {
        return Attribute::make(
            get: fn() => is_file($this->video_path)
        );
    }

    public function videoSizeHuman(): Attribute
    {
        return Attribute::make(
            get: function () {
                $base = log($this->video_size) / log(1024);
                $suffix = ["", "k", "M", "G", "T"][floor($base)];
                return round(pow(1024, $base - floor($base)), 2) . $suffix;
            },
        );
    }

}