<?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;
use Modules\SystemUser\Models\SysUserModel;

/**
 * 采购单模型（按门店订单汇总生成，按商品+供应商聚合）
 */
class PurchaseOrderModel extends Model
{
    use HasFactory;

    /** 状态：待发送 */
    public const STATUS_PENDING = 0;
    /** 状态：部分发送 */
    public const STATUS_PART_SENT = 1;
    /** 状态：全部发送 */
    public const STATUS_ALL_SENT = 2;
    /** 状态：已完成 */
    public const STATUS_COMPLETED = 3;

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

    protected $fillable = [
        'purchase_no',
        'purchase_date',
        'status',
        'total_quantity',
        'total_weight',
        'estimate_amount',
        'actual_amount',
        'operator_id',
        'remark',
    ];

    protected $casts = [
        'purchase_date' => 'date:Y-m-d',
        'status' => 'integer',
        'total_quantity' => 'decimal:2',
        'total_weight' => 'decimal:3',
        'estimate_amount' => 'decimal:2',
        'actual_amount' => 'decimal:2',
        'operator_id' => 'integer',
    ];

    /**
     * 制单人（后台系统用户）
     */
    public function operator(): BelongsTo
    {
        return $this->belongsTo(SysUserModel::class, 'operator_id', 'id');
    }

    /**
     * 采购明细
     */
    public function items(): HasMany
    {
        return $this->hasMany(PurchaseOrderItemModel::class, 'purchase_id', 'id')->orderBy('sort');
    }
}