<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Textbook extends Model
{
    protected $table = 'textbooks';

    protected $fillable = [
        'id',
        'series_id',
        'stage',
        'schooling_system',
        'grade',
        'semester',
        'naming_scheme',
        'track',
        'module_type',
        'volume_no',
        'legacy_code',
        'curriculum_standard_year',
        'curriculum_revision_year',
        'approval_authority',
        'approval_year',
        'edition_label',
        'official_title',
        'display_title',
        'aliases',
        'isbn',
        'cover_path',
        'status',
        'sort_order',
        'meta',
        'series',
        'created_at',
        'updated_at',
    ];

    protected $casts = [
        'aliases' => 'array',
        'meta' => 'array',
        'grade' => 'integer',
        'semester' => 'integer',
        'volume_no' => 'integer',
        'curriculum_standard_year' => 'integer',
        'curriculum_revision_year' => 'integer',
        'approval_year' => 'integer',
        'sort_order' => 'integer',
    ];

    public function __construct(array $attributes = [])
    {
        parent::__construct($attributes);

        // 从 API 数据初始化时设置属性
        foreach ($attributes as $key => $value) {
            $this->setAttribute($key, $value);
        }
    }

    public function series()
    {
        return $this->belongsTo(TextbookSeries::class);
    }

    public function catalogs()
    {
        return $this->hasMany(TextbookCatalog::class);
    }

    /**
     * 获取系列信息（兼容 API 返回的嵌套对象）
     */
    public function getSeriesAttribute($value)
    {
        if (is_array($value)) {
            return (object) $value;
        }
        return $value;
    }
}