<?php

namespace App\Models;

use Encore\Admin\Traits\AdminBuilder;
use Encore\Admin\Traits\ModelTree;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class Category extends Model
{
    use AdminBuilder, ModelTree;

    public const TYPES = [
        'article' => '文章列表',
        'show'    => '文章详情',
        'advert'  => '广告',
        'picture' => '图册',
    ];

    public const TYPE_SHOW    = 'show';
    public const TYPE_ARTICLE = 'article';
    public const TYPE_ADVERT  = 'advert';
    public const TYPE_PICTURE = 'picture';

    /**
     * 关联的数据
     * @return [type] [description]
     */
    public function relations()
    {
        switch ($this->type) {
            case self::TYPE_SHOW:
                return $this->hasOne(Article::class,'id','article_id');
                break;
            case self::TYPE_ARTICLE:
                return $this->hasMany(Article::class);
                break;
            case self::TYPE_ADVERT:
                return $this->hasMany(Advert::class);
                break;
            default:
                return null;
        }
    }

    public function parent(): BelongsTo
    {
        return $this->belongsTo(__CLASS__)->withDefault(['name' => '顶级分类']);
    }

    public function children(): HasMany
    {
        return $this->hasMany(__CLASS__, 'parent_id');
    }

}