<?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;

class AfterSale extends Model
{
    use HasFactory;

    protected $table = 'after_sales';

    protected $fillable = [
        'short_id',
        'order_id',
        'order_short_id',
        'type',
        'status',
        'reason',
        'description',
        'refund_amount',
        'return_express_company',
        'return_express_no',
        'reject_reason',
        'processed_by',
        'processed_at',
        'created_by',
        'completed_at',
    ];

    protected $casts = [
        'refund_amount' => 'decimal:2',
        'processed_at' => 'datetime',
        'completed_at' => 'datetime',
    ];

    // 售后类型
    const TYPE_REFUND_ONLY = 'refund_only';   // 仅退款
    const TYPE_RETURN = 'return';             // 退货
    const TYPE_EXCHANGE = 'exchange';         // 换货

    // 售后状态
    const STATUS_PENDING = 'pending';         // 待处理
    const STATUS_PROCESSING = 'processing';   // 处理中
    const STATUS_COMPLETED = 'completed';      // 已完成
    const STATUS_REJECTED = 'rejected';       // 已拒绝

    // 获取类型文本
    public static function getTypeText(string $type): string
    {
        return match($type) {
            self::TYPE_REFUND_ONLY => '仅退款',
            self::TYPE_RETURN => '退货',
            self::TYPE_EXCHANGE => '换货',
            default => $type,
        };
    }

    // 获取状态文本
    public static function getStatusText(string $status): string
    {
        return match($status) {
            self::STATUS_PENDING => '待处理',
            self::STATUS_PROCESSING => '处理中',
            self::STATUS_COMPLETED => '已完成',
            self::STATUS_REJECTED => '已拒绝',
            default => $status,
        };
    }

    // 生成售后单号
    public static function generateShortId(): string
    {
        return 'AS' . date('Ymd') . str_pad(random_int(1, 9999), 4, '0', STR_PAD_LEFT);
    }

    // 关联订单
    public function order(): BelongsTo
    {
        return $this->belongsTo(Order::class, 'order_id');
    }

    // 关联处理人
    public function processor(): BelongsTo
    {
        return $this->belongsTo(User::class, 'processed_by');
    }

    // 关联申请人
    public function creator(): BelongsTo
    {
        return $this->belongsTo(User::class, 'created_by');
    }

    // 关联明细
    public function items(): HasMany
    {
        return $this->hasMany(AfterSaleItem::class, 'after_sale_id');
    }
}