<?php

namespace App\Models;

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

/**
 * 采购金额分摊模型（实际采购金额按订货比例分摊到门店/单品，尾差修正保证金额守恒）
 */
class PurchaseAllocationModel extends Model
{
    protected $table = 'purchase_allocation';
    protected $primaryKey = 'id';

    protected $fillable = [
        'purchase_item_id',
        'order_item_id',
        'store_id',
        'product_id',
        'quantity',
        'weight',
        'amount',
    ];

    protected $casts = [
        'purchase_item_id' => 'integer',
        'order_item_id' => 'integer',
        'store_id' => 'integer',
        'product_id' => 'integer',
        'quantity' => 'decimal:2',
        'weight' => 'decimal:3',
        'amount' => 'decimal:2',
    ];

    /**
     * 来源采购明细
     */
    public function purchaseItem(): BelongsTo
    {
        return $this->belongsTo(PurchaseOrderItemModel::class, 'purchase_item_id', 'id');
    }

    /**
     * 溯源订货明细
     */
    public function orderItem(): BelongsTo
    {
        return $this->belongsTo(StoreOrderItemModel::class, 'order_item_id', 'id');
    }

    /**
     * 分摊门店
     */
    public function store(): BelongsTo
    {
        return $this->belongsTo(StoreModel::class, 'store_id', 'id');
    }

    /**
     * 分摊商品
     */
    public function product(): BelongsTo
    {
        return $this->belongsTo(ProductModel::class, 'product_id', 'id');
    }
}