<?php

namespace Peidikeji\Goods\Models;

use Dcat\Admin\Traits\ModelTree;
use Illuminate\Database\Eloquent\Model;

class GoodsCategory extends Model
{
    use ModelTree;

    protected $table = 'goods_category';

    protected $fillable = ['name', 'image', 'description', 'parent_id', 'level', 'sort', 'path', 'is_enable'];

    protected $titleColumn = 'name';
    protected $orderColumn = 'sort';

    public $timestamps = false;

    protected static function boot()
    {
        parent::boot();
        // 监听 Category 的创建事件，用于初始化 path 和 level 字段值
        static::creating(function ($category) {
            // 如果创建的是一个根类目
            if (!$category->parent_id) {
                // 将层级设为 1
                $category->level = 1;
                // 将 path 设为 -
                $category->path  = '-';
            } else {
                // 将层级设为父类目的层级 + 1
                $category->level = $category->parent->level + 1;
                // 将 path 值设为父类目的 path 追加父类目 ID 以及最后跟上一个 - 分隔符
                $category->path  = $category->parent->path.$category->parent_id.'-';
            }
        });

        static::deleting(function ($category) {
            // 所有下级分类
            $ids = GoodsCategory::where('path', 'like', '%-'.$category->id.'-%')->pluck('id');
            // 检查下级分类是否包含商品
            if (Goods::whereIn('category_id', array_merge($ids, [$category->id]))->exists()) {
                // todo 阻止删除该分类
            }
            // 删除所有下级分类
            GoodsCategory::where('path', 'like', '%-'.$category->id.'-%')->delete();
        });
    }

    public static function selectOptions(\Closure $closure = null, $rootText = null)
    {
        $options = (new static())->withQuery($closure)->buildSelectOptions();

        $list = collect($options);

        if ($rootText !== false) {
            $rootText = $rootText ?: admin_trans_label('root');
            $list->prepend($rootText, 0);
        }

        return $list->all();
    }

    public function parent()
    {
        return $this->belongsTo(self::class, 'parent_id');
    }

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

    public function goods()
    {
        return $this->hasMany(Goods::class, 'category_id');
    }

    public function scopeOrder($q)
    {
        return $q->orderBy('sort');
    }
}