<?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;

/**
 * 门店账单模型（采购单完成后按门店生成；商品金额由订单汇总快照，生成后不可修改）
 */
class BillModel extends Model
{
    use HasFactory;

    /** 支付状态：未支付 */
    public const int STATUS_UNPAID = 0;
    /** 支付状态：已支付 */
    public const int STATUS_PAID = 1;

    /** 支付状态中文名 */
    public const array STATUS_NAMES = [
        self::STATUS_UNPAID => '未支付',
        self::STATUS_PAID => '已支付',
    ];

    /** 支付进度（小程序端）：待支付（可发起合并付款） */
    public const int PAY_STATE_UNPAID = 0;
    /** 支付进度：审核中（已提交合并付款凭证，待后台审核；审核拒绝后释放回待支付） */
    public const int PAY_STATE_REVIEWING = 1;
    /** 支付进度：已支付 */
    public const int PAY_STATE_PAID = 2;

    /** 支付进度中文名 */
    public const array PAY_STATE_NAMES = [
        self::PAY_STATE_UNPAID => '待支付',
        self::PAY_STATE_REVIEWING => '审核中',
        self::PAY_STATE_PAID => '已支付',
    ];

    /**
     * 支付进度推导：已支付 > 审核中（payment_id 锁定中）> 待支付
     * （支付审核拒绝后 payment_id 释放为 0，回到待支付；线下收款直接置已支付）
     */
    public function payState(): int
    {
        if ($this->status === self::STATUS_PAID) {
            return self::PAY_STATE_PAID;
        }
        return $this->payment_id > 0 ? self::PAY_STATE_REVIEWING : self::PAY_STATE_UNPAID;
    }

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

    protected $fillable = [
        'bill_no',
        'purchase_id',
        'store_id',
        'bill_date',
        'product_amount',
        'delivery_fee',
        'box_num',
        'tray_num',
        'box_price',
        'tray_price',
        'added_amount',
        'total_amount',
        'status',
        'payment_id',
        'paid_at',
        'pay_remark',
        'paid_operator_id',
        'operator_id',
        'remark',
        'after_sale',
    ];

    protected $casts = [
        'purchase_id' => 'integer',
        'store_id' => 'integer',
        'bill_date' => 'date:Y-m-d',
        'product_amount' => 'decimal:2',
        'delivery_fee' => 'decimal:2',
        'box_num' => 'integer',
        'tray_num' => 'integer',
        'box_price' => 'decimal:2',
        'tray_price' => 'decimal:2',
        'added_amount' => 'decimal:2',
        'total_amount' => 'decimal:2',
        'status' => 'integer',
        'payment_id' => 'integer',
        'paid_at' => 'datetime:Y-m-d H:i:s',
        'paid_operator_id' => 'integer',
        'operator_id' => 'integer',
        'created_at' => 'datetime:Y-m-d H:i:s',
    ];

    /**
     * 所属门店（含软删除门店，保证历史账单可见）
     */
    public function store(): BelongsTo
    {
        return $this->belongsTo(StoreModel::class, 'store_id', 'id')->withTrashed();
    }

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

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

    /**
     * 收款操作人（后台系统用户，线下收款登记）
     */
    public function paidOperator(): BelongsTo
    {
        return $this->belongsTo(SysUserModel::class, 'paid_operator_id', 'id');
    }

    /**
     * 关联支付记录（小程序合并付款）
     */
    public function payment(): BelongsTo
    {
        return $this->belongsTo(PaymentModel::class, 'payment_id', 'id');
    }

    /**
     * 本账单关联的门店订单
     */
    public function orders(): HasMany
    {
        return $this->hasMany(StoreOrderModel::class, 'bill_id', 'id');
    }

    /**
     * 本账单关联的门店订单明细
     */
    public function items(): HasMany
    {
        return $this->hasMany(StoreOrderItemModel::class, 'bill_id', 'id');
    }
}