<?php

namespace app\common\model\lottery;

use think\Model;
use traits\model\SoftDelete;

/**
 * 抽奖奖品模型
 */
class LotteryPrize extends Model
{
    use SoftDelete;

    // 表名
    protected $name = 'shop_lottery_prize';
    
    // 开启自动写入时间戳字段
    protected $autoWriteTimestamp = 'int';
    // 定义时间戳字段名
    protected $createTime = 'createtime';
    protected $updateTime = 'updatetime';
    protected $deleteTime = 'deletetime';

    // 追加属性
    protected $append = [
        'type_text',
        'deliver_type_text',
        'exchange_codes_list',
        'used_codes_list'
    ];

    // 奖品类型常量
    const TYPE_NO_PRIZE = 1;        // 未中奖
    const TYPE_PHYSICAL = 2;        // 实物奖品
    const TYPE_COUPON = 3;          // 优惠券
    const TYPE_RED_PACKET = 4;      // 红包
    const TYPE_EXCHANGE_CODE = 5;   // 兑换码
    const TYPE_GOODS = 6;           // 商城奖品

    // 发放方式常量
    const DELIVER_AUTO = 1;         // 自动发放
    const DELIVER_MANUAL = 2;       // 手动发放

    /**
     * 关联活动
     */
    public function activity()
    {
        return $this->belongsTo('LotteryActivity', 'activity_id');
    }

    /**
     * 关联商品
     */
    public function goods()
    {
        return $this->belongsTo('app\common\model\Goods', 'goods_id');
    }

    /**
     * 关联商品SKU
     */
    public function goodsSku()
    {
        return $this->belongsTo('app\common\model\Sku', 'goods_sku_id');
    }

    /**
     * 关联优惠券
     */
    public function coupon()
    {
        return $this->belongsTo('app\common\model\Coupon', 'coupon_id');
    }

    /**
     * 获取奖品类型文本
     */
    public function getTypeTextAttr($value, $data)
    {
        $types = [
            self::TYPE_NO_PRIZE => '未中奖',
            self::TYPE_PHYSICAL => '实物奖品',
            self::TYPE_COUPON => '优惠券',
            self::TYPE_RED_PACKET => '红包',
            self::TYPE_EXCHANGE_CODE => '兑换码',
            self::TYPE_GOODS => '商城奖品'
        ];
        return isset($types[$data['type']]) ? $types[$data['type']] : '未知';
    }

    /**
     * 获取发放方式文本
     */
    public function getDeliverTypeTextAttr($value, $data)
    {
        $types = [
            self::DELIVER_AUTO => '自动发放',
            self::DELIVER_MANUAL => '手动发放'
        ];
        return isset($types[$data['deliver_type']]) ? $types[$data['deliver_type']] : '未知';
    }

    /**
     * 获取兑换码列表
     */
    public function getExchangeCodesListAttr($value, $data)
    {
        return !empty($data['exchange_codes']) ? json_decode($data['exchange_codes'], true) : [];
    }

    /**
     * 设置兑换码列表
     */
    public function setExchangeCodesAttr($value)
    {
        return is_array($value) ? json_encode($value) : $value;
    }

    /**
     * 获取已使用兑换码列表
     */
    public function getUsedCodesListAttr($value, $data)
    {
        return !empty($data['used_codes']) ? json_decode($data['used_codes'], true) : [];
    }

    /**
     * 设置已使用兑换码列表
     */
    public function setUsedCodesAttr($value)
    {
        return is_array($value) ? json_encode($value) : $value;
    }

    /**
     * 检查奖品库存是否充足
     */
    public function hasStock($quantity = 1)
    {
        return $this->remain_stock >= $quantity;
    }

    /**
     * 减少库存
     */
    public function decreaseStock($quantity = 1)
    {
        if (!$this->hasStock($quantity)) {
            return false;
        }
        
        $this->remain_stock -= $quantity;
        $this->win_count += $quantity;
        return $this->save();
    }

    /**
     * 获取可用的兑换码
     */
    public function getAvailableExchangeCode()
    {
        if ($this->type != self::TYPE_EXCHANGE_CODE) {
            return null;
        }
        
        $allCodes = $this->exchange_codes_list;
        $usedCodes = $this->used_codes_list;
        
        $availableCodes = array_diff($allCodes, $usedCodes);
        
        if (empty($availableCodes)) {
            return null;
        }
        
        return array_shift($availableCodes);
    }

    /**
     * 标记兑换码为已使用
     */
    public function markExchangeCodeUsed($code)
    {
        $usedCodes = $this->used_codes_list;
        if (!in_array($code, $usedCodes)) {
            $usedCodes[] = $code;
            $this->used_codes = json_encode($usedCodes);
            return $this->save();
        }
        return true;
    }

    /**
     * 获取有效奖品（库存大于0且状态正常）
     */
    public static function getValidPrizes($activityId)
    {
        return static::where('activity_id', $activityId)
                     ->where('status', 1)
                     ->where('remain_stock', '>', 0)
                     ->order('sort_order', 'asc')
                     ->select();
    }

    /**
     * 检查是否已解锁（按人数解锁功能）
     */
    public function isUnlocked($currentPeopleCount)
    {
        if (empty($this->unlock_people_num)) {
            return true;
        }
        
        return $currentPeopleCount >= $this->unlock_people_num;
    }
}