<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Casts\Attribute;
use Carbon\Traits\Date;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;

/**
 * @property int $course_id
 * @property string $name
 * @property string $thumbnail
 * @property string $link
 * @property string $status
 * @property integer $numberofchapters
 * @property integer $timeswatched
 * @property Date $published_at
 * @property Chapter[] $chapters
 */
class Course extends Model
{
    use HasFactory;

    protected $fillable = [
        'name',
        'thumbnail',
        'link',
        'status',
        'numberofchapters',
        'timeswatched',
        'published_at',
    ];

    protected $dates = [
        'published_at'
    ];

    public function chapters(): HasMany
    {
        return $this->hasMany(Chapter::class);
    }

    public function totalSize(): Attribute
    {
        return Attribute::make(
            get: fn() => $this->chapters->sum('video_size'),
        );
    }

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