<?php

namespace app\common\model\lottery;

use think\Model;

/**
 * 用户抽奖机会模型
 */
class LotteryUserChance extends Model
{
    // 表名
    protected $name = 'shop_lottery_user_chance';
    
    // 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 = false;

    // 追加属性
    protected $append = [
        'get_detail_data'
    ];

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

    /**
     * 关联用户
     */
    public function user()
    {
        return $this->belongsTo('app\common\model\User', 'user_id');
    }

    /**
     * 获取获得详情数据
     */
    public function getGetDetailDataAttr($value, $data)
    {
        return !empty($data['get_detail']) ? json_decode($data['get_detail'], true) : [];
    }

    /**
     * 设置获得详情
     */
    public function setGetDetailAttr($value)
    {
        return is_array($value) ? json_encode($value) : $value;
    }

    /**
     * 获取用户抽奖机会
     */
    public static function getUserChance($activityId, $userId)
    {
        return static::where('activity_id', $activityId)
                     ->where('user_id', $userId)
                     ->find();
    }

    /**
     * 增加抽奖机会
     */
    public static function addChance($activityId, $userId, $times = 1, $detail = [])
    {
        $chance = static::getUserChance($activityId, $userId);
        
        if (!$chance) {
            // 创建新记录
            $data = [
                'activity_id' => $activityId,
                'user_id' => $userId,
                'total_chances' => $times,
                'used_chances' => 0,
                'remain_chances' => $times,
                'last_get_time' => time(),
                'get_detail' => json_encode([$detail])
            ];
            return static::create($data);
        } else {
            // 更新现有记录
            $chance->total_chances += $times;
            $chance->remain_chances += $times;
            $chance->last_get_time = time();
            
            // 更新获得详情
            $getDetail = $chance->get_detail_data;
            $getDetail[] = $detail;
            $chance->get_detail = json_encode($getDetail);
            
            return $chance->save() ? $chance : false;
        }
    }

    /**
     * 使用抽奖机会
     */
    public function useChance($times = 1)
    {
        if ($this->remain_chances < $times) {
            return false;
        }
        
        $this->used_chances += $times;
        $this->remain_chances -= $times;
        $this->last_use_time = time();
        
        return $this->save();
    }

    /**
     * 检查是否有剩余机会
     */
    public function hasChance($times = 1)
    {
        return $this->remain_chances >= $times;
    }

    /**
     * 重置抽奖机会（用于测试或特殊情况）
     */
    public function resetChance()
    {
        $this->used_chances = 0;
        $this->remain_chances = $this->total_chances;
        return $this->save();
    }

    /**
     * 获取活动总参与人数
     */
    public static function getActivityParticipants($activityId)
    {
        return static::where('activity_id', $activityId)->count();
    }

    /**
     * 获取用户在多个活动中的机会统计
     */
    public static function getUserChancesStats($userId, $activityIds = [])
    {
        $query = static::where('user_id', $userId);
        
        if (!empty($activityIds)) {
            $query->where('activity_id', 'in', $activityIds);
        }
        
        return $query->field([
                'activity_id',
                'total_chances',
                'used_chances', 
                'remain_chances'
            ])
            ->select();
    }

    /**
     * 批量创建用户机会（用于活动启动时）
     */
    public static function batchCreateChances($activityId, $userIds, $times = 1)
    {
        $data = [];
        $now = time();
        
        foreach ($userIds as $userId) {
            $data[] = [
                'activity_id' => $activityId,
                'user_id' => $userId,
                'total_chances' => $times,
                'used_chances' => 0,
                'remain_chances' => $times,
                'last_get_time' => $now,
                'createtime' => $now,
                'updatetime' => $now
            ];
        }
        
        return static::insertAll($data);
    }
}