<?php

/**
 * 文件功能：用户购买记录模型
 * 对应 user_purchases 表，追踪每次商品购买的状态与有效期
 */

namespace App\Models;

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

class UserPurchase extends Model
{
    protected $table = 'user_purchases';

    protected $fillable = [
        'user_id', 'shop_item_id', 'status', 'price_paid',
        'expires_at', 'used_at',
    ];

    protected $casts = [
        'expires_at' => 'datetime',
        'used_at' => 'datetime',
    ];

    /**
     * 购买记录所属用户
     */
    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }

    /**
     * 购买记录对应的商品（shopItem 别名，兼容婚姻系统调用）
     */
    public function item(): BelongsTo
    {
        return $this->belongsTo(ShopItem::class, 'shop_item_id');
    }

    /**
     * 购买记录对应的商品
     */
    public function shopItem(): BelongsTo
    {
        return $this->belongsTo(ShopItem::class, 'shop_item_id');
    }

    /**
     * 判断周卡是否仍在有效期内
     */
    public function isAlive(): bool
    {
        if ($this->status !== 'active') {
            return false;
        }
        if ($this->expires_at && $this->expires_at->isPast()) {
            return false;
        }

        return true;
    }
}