<?php

namespace App\Models\System;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;

class City extends Model
{
    protected $table = 'system_cities';

    protected $fillable = [
        'parent_id',
        'name',
        'code',
        'pinyin',
        'pinyin_short',
        'level',
        'sort',
        'status',
    ];

    protected $casts = [
        'parent_id' => 'integer',
        'level' => 'integer',
        'sort' => 'integer',
        'status' => 'boolean',
    ];

    public function children(): HasMany
    {
        return $this->hasMany(City::class, 'parent_id')->orderBy('sort');
    }

    public function activeChildren(): HasMany
    {
        return $this->hasMany(City::class, 'parent_id')
            ->where('status', true)
            ->orderBy('sort');
    }

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