<?php

namespace App\Models;

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

class Zone extends Model
{
    use ModelTree;
    public const TYPE_PROVINCE = 'province';
    public const TYPE_CITY = 'city';
    public const TYPE_AREA = 'area';

    /**
     * @var array
     */
    protected $fillable = [
        'name',
        'parent_id',
        'type',
    ];

    /**
     * 仅查询区级地区
     */
    public function scopeAreas($query)
    {
        return $query->where('type', static::TYPE_AREA);
    }

    /**
     * 此地区的上级地区
     */
    public function parent()
    {
        return $this->belongsTo(static::class, 'parent_id');
    }

    /**
     * 确认此地区是否是省
     *
     * @return bool
     */
    public function isProvince(): bool
    {
        return $this->type === static::TYPE_PROVINCE;
    }

    /**
     * 确认此地区是否是市
     *
     * @return bool
     */
    public function isCity(): bool
    {
        return $this->type === static::TYPE_CITY;
    }

    /**
     * 确认此地区是否是区
     *
     * @return bool
     */
    public function isArea(): bool
    {
        return $this->type === static::TYPE_AREA;
    }

    /**
     * 获取当前地区的完整名称
     *
     * @return string
     */
    public function getFullNameAttribute()
    {
        if ($this->parent_id === null) {
            return $this->name;
        }

        return $this->parent->full_name . ' ' . $this->name;
    }
}