<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

/**
 * 采购单明细模型（按商品+供应商聚合，快照品名/规格；实际金额录入后用于分摊）
 */
class PurchaseOrderItemModel extends Model
{
    use HasFactory;

    /** 未发送供应商 */
    public const NOT_SENT = 0;
    /** 已发送供应商 */
    public const SENT = 1;

    protected $table = 'purchase_order_item';
    protected $primaryKey = 'id';

    protected $fillable = [
        'purchase_id',
        'product_id',
        'supplier_id',
        'product_name',
        'product_spec',
        'price',
        'quantity',
        'weight',
        'amount',
        'sort',
        'is_sent',
        'sent_at',
        'supplier_confirmed_at',
        'remark',
    ];

    protected $casts = [
        'purchase_id' => 'integer',
        'product_id' => 'integer',
        'supplier_id' => 'integer',
        'price' => 'decimal:2',
        'quantity' => 'decimal:2',
        'weight' => 'decimal:3',
        'amount' => 'decimal:2',
        'sort' => 'integer',
        'is_sent' => 'integer',
        'sent_at' => 'datetime',
        'supplier_confirmed_at' => 'datetime',
    ];

    /**
     * 所属采购单
     */
    public function purchase(): BelongsTo
    {
        return $this->belongsTo(PurchaseOrderModel::class, 'purchase_id', 'id');
    }

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

    /**
     * 供货供应商
     */
    public function supplier(): BelongsTo
    {
        return $this->belongsTo(SupplierModel::class, 'supplier_id', 'id');
    }

    /**
     * 金额分摊记录（按订货比例摊到门店/单品）
     */
    public function allocations(): HasMany
    {
        return $this->hasMany(PurchaseAllocationModel::class, 'purchase_item_id', 'id');
    }
}