<?php
namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;

class Goods extends Model
{
    use SoftDeletes;

    protected $table = 'goods';

    protected $fillable = [
        'name',
        'code',
        'barcode',
        'category',
        'unit',
        'weight',
        'retail_price',
        'cost_price',
        'stock_warning',
        'type',
        'custom_id',
        'packaging_cost',
        'shipping_packaging_cost',
        'volume',
        'length',
        'width',
        'height',
        'brand_id',
        'batch_management',
    ];

    protected $casts = [
        'weight' => 'decimal:2',
        'retail_price' => 'decimal:2',
        'cost_price' => 'decimal:2',
        'packaging_cost' => 'decimal:2',
        'shipping_packaging_cost' => 'decimal:2',
        'volume' => 'decimal:2',
        'length' => 'decimal:2',
        'width' => 'decimal:2',
        'height' => 'decimal:2',
        'batch_management' => 'boolean',
    ];

    /**
     * 关联品牌
     */
    public function brand()
    {
        return $this->belongsTo(Brand::class);
    }

    /**
     * 关联供应商（多对多）
     */
    public function suppliers()
    {
        return $this->belongsToMany(Supplier::class, 'goods_supplier');
    }

    /**
     * 如果是组合商品，关联子商品
     */
    public function comboItems()
    {
        return $this->hasMany(ComboItem::class, 'combo_goods_id');
    }

    /**
     * 作为子商品时，被哪些组合商品包含
     */
    public function parentCombos()
    {
        return $this->belongsToMany(Goods::class, 'combo_items', 'goods_id', 'combo_goods_id')
                    ->withPivot('quantity');
    }
}