<?php

namespace app\common\Service\lottery;

use app\common\model\lottery\LotteryActivity;
use app\common\model\lottery\LotteryCondition;
use app\common\model\lottery\LotteryUserChance;
use app\common\model\lottery\LotteryDrawRecord;
use app\common\model\User;
use app\common\model\Order;
use app\common\Enum\LotteryEnum;
use think\Exception;
use think\Db;

/**
 * 抽奖机会服务类
 * 处理用户获得抽奖机会的逻辑
 * 
 * 主要功能：
 * - 订单/充值后自动分发抽奖机会
 * - 条件验证和机会计算
 * - 用户机会管理
 * - 批量操作和统计
 */
class LotteryChanceService
{
    // ============ 常量定义 ============
    
    /** @var int 默认批量处理数量 */
    const DEFAULT_BATCH_SIZE = 100;
    
    /** @var int 最大批量处理数量 */
    const MAX_BATCH_SIZE = 1000;
    
    /** @var string 触发类型：订单 */
    const TRIGGER_TYPE_ORDER = 'order';
    
    /** @var string 触发类型：充值 */
    const TRIGGER_TYPE_RECHARGE = 'recharge';
    
    /** @var string 触发类型：累计消费 */
    const TRIGGER_TYPE_ACCUMULATE = 'accumulate';
    
    /** @var string 触发类型：手动 */
    const TRIGGER_TYPE_MANUAL = 'manual';

    // ============ 主要业务方法 ============

    /**
     * 订单完成后检查并分发抽奖机会
     * 
     * @param array $orderInfo 订单信息 ['id', 'total_amount', 'goods' => [['goods_id']]]
     * @param int $userId 用户ID
     * @return array 获得的抽奖机会信息
     * @throws Exception
     */
    public static function checkAndGrantChanceForOrder($orderInfo, $userId)
    {
        if (empty($orderInfo) || empty($userId)) {
            throw new Exception('订单信息或用户ID不能为空');
        }

        $grantedChances = [];
        
        try {
        // 获取所有正在进行的抽奖活动
            $activities = LotteryService::getRunningActivities();
        
        foreach ($activities as $activity) {
            try {
                $chances = static::processActivityForOrder($activity, $orderInfo, $userId);
                if ($chances > 0) {
                    $grantedChances[] = [
                        'activity_id' => $activity->id,
                        'activity_name' => $activity->name,
                            'chances' => $chances,
                            'granted_time' => time()
                    ];
                }
            } catch (Exception $e) {
                // 记录错误但不影响其他活动的处理
                    trace("抽奖机会分发失败 - 活动ID: {$activity->id}, 用户ID: {$userId}, 错误: " . $e->getMessage(), 'error');
                }
            }
        } catch (Exception $e) {
            trace("订单抽奖机会分发失败 - 用户ID: {$userId}, 错误: " . $e->getMessage(), 'error');
            throw $e;
        }
        
        return $grantedChances;
    }

    /**
     * 充值完成后检查并分发抽奖机会
     * 
     * @param array $rechargeInfo 充值信息 ['amount', 'type' => 'recharge']
     * @param int $userId 用户ID
     * @return array 获得的抽奖机会信息
     * @throws Exception
     */
    public static function checkAndGrantChanceForRecharge($rechargeInfo, $userId)
    {
        if (empty($rechargeInfo) || empty($userId)) {
            throw new Exception('充值信息或用户ID不能为空');
        }

        $grantedChances = [];
        
        try {
        // 获取所有正在进行的抽奖活动
            $activities = LotteryService::getRunningActivities();
        
        foreach ($activities as $activity) {
            try {
                $chances = static::processActivityForRecharge($activity, $rechargeInfo, $userId);
                if ($chances > 0) {
                    $grantedChances[] = [
                        'activity_id' => $activity->id,
                        'activity_name' => $activity->name,
                            'chances' => $chances,
                            'granted_time' => time()
                    ];
                }
            } catch (Exception $e) {
                // 记录错误但不影响其他活动的处理
                    trace("充值抽奖机会分发失败 - 活动ID: {$activity->id}, 用户ID: {$userId}, 错误: " . $e->getMessage(), 'error');
                }
            }
        } catch (Exception $e) {
            trace("充值抽奖机会分发失败 - 用户ID: {$userId}, 错误: " . $e->getMessage(), 'error');
            throw $e;
        }
        
        return $grantedChances;
    }

    /**
     * 手动给用户增加抽奖机会（管理员操作）
     * 
     * @param int $activityId 活动ID
     * @param int $userId 用户ID
     * @param int $chances 机会次数
     * @param string $reason 原因
     * @param int $adminId 管理员ID
     * @return bool
     * @throws Exception
     */
    public static function manualGrantChance($activityId, $userId, $chances, $reason = '', $adminId = 0)
    {
        if ($chances <= 0) {
            throw new Exception('抽奖机会数量必须大于0');
        }

        $activity = LotteryActivity::find($activityId);
        if (!$activity) {
            throw new Exception('活动不存在');
        }

        $user = User::find($userId);
        if (!$user) {
            throw new Exception('用户不存在');
        }

        $detail = [
            'trigger_type' => static::TRIGGER_TYPE_MANUAL,
            'reason' => $reason,
            'admin_id' => $adminId,
            'granted_time' => time()
        ];

        return static::grantChanceToUser($activityId, $userId, $chances, $detail);
    }

    /**
     * 批量初始化用户抽奖机会（活动开始时）
     * 
     * @param int $activityId 活动ID
     * @param array $userIds 用户ID数组
     * @param int $initChances 初始机会数
     * @param int $batchSize 批量处理大小
     * @return array 处理结果
     * @throws Exception
     */
    public static function batchInitChances($activityId, $userIds, $initChances = 1, $batchSize = null)
    {
        if (empty($userIds)) {
            throw new Exception('用户ID列表不能为空');
        }

        $activity = LotteryActivity::find($activityId);
        if (!$activity) {
            throw new Exception('活动不存在');
        }

        $batchSize = $batchSize ?: static::DEFAULT_BATCH_SIZE;
        $batchSize = min($batchSize, static::MAX_BATCH_SIZE);

        $result = [
            'total_users' => count($userIds),
            'success_count' => 0,
            'failed_count' => 0,
            'errors' => []
        ];

        // 分批处理
        $batches = array_chunk($userIds, $batchSize);
        
        foreach ($batches as $batch) {
            try {
                $success = static::batchCreateChances($activityId, $batch, $initChances);
                if ($success) {
                    $result['success_count'] += count($batch);
                } else {
                    $result['failed_count'] += count($batch);
                    $result['errors'][] = "批次处理失败: " . implode(',', $batch);
                }
            } catch (Exception $e) {
                $result['failed_count'] += count($batch);
                $result['errors'][] = "批次处理异常: " . $e->getMessage();
            }
        }

        return $result;
    }

    // ============ 私有处理方法 ============

    /**
     * 处理订单相关的活动
     * 
     * @param LotteryActivity $activity 活动对象
     * @param array $orderInfo 订单信息
     * @param int $userId 用户ID
     * @return int 获得的抽奖机会数量
     */
    private static function processActivityForOrder($activity, $orderInfo, $userId)
    {
        // 检查用户是否符合活动参与资格
        if (!static::checkUserQualification($activity, $userId)) {
            return 0;
        }

        // 获取活动的参与条件
        $conditions = static::getValidConditions($activity->id);
        $totalChances = 0;

        foreach ($conditions as $condition) {
            // 跳过充值条件
            if ($condition->type == LotteryEnum::CONDITION_TYPE_RECHARGE_AMOUNT) {
                continue;
            }

            $chances = static::processConditionForOrder($condition, $orderInfo, $userId);
            $totalChances += $chances;
        }

        // 如果获得了抽奖机会，记录到数据库
        if ($totalChances > 0) {
            static::grantChanceToUser($activity->id, $userId, $totalChances, [
                'trigger_type' => static::TRIGGER_TYPE_ORDER,
                'order_id' => $orderInfo['id'] ?? 0,
                'order_amount' => $orderInfo['total_amount'] ?? 0,
                'granted_time' => time()
            ]);
        }

        return $totalChances;
    }

    /**
     * 处理充值相关的活动
     * 
     * @param LotteryActivity $activity 活动对象
     * @param array $rechargeInfo 充值信息
     * @param int $userId 用户ID
     * @return int 获得的抽奖机会数量
     */
    private static function processActivityForRecharge($activity, $rechargeInfo, $userId)
    {
        // 检查用户是否符合活动参与资格
        if (!static::checkUserQualification($activity, $userId)) {
            return 0;
        }

        // 获取活动的参与条件
        $conditions = static::getValidConditions($activity->id);
        $totalChances = 0;

        foreach ($conditions as $condition) {
            // 只处理充值条件
            if ($condition->type != LotteryEnum::CONDITION_TYPE_RECHARGE_AMOUNT) {
                continue;
            }

            $chances = static::processConditionForRecharge($condition, $rechargeInfo, $userId);
            $totalChances += $chances;
        }

        // 如果获得了抽奖机会，记录到数据库
        if ($totalChances > 0) {
            static::grantChanceToUser($activity->id, $userId, $totalChances, [
                'trigger_type' => static::TRIGGER_TYPE_RECHARGE,
                'recharge_amount' => $rechargeInfo['amount'] ?? 0,
                'granted_time' => time()
            ]);
        }

        return $totalChances;
    }

    /**
     * 处理订单条件
     * 
     * @param LotteryCondition $condition 条件对象
     * @param array $orderInfo 订单信息
     * @param int $userId 用户ID
     * @return int 获得的抽奖机会数量
     */
    private static function processConditionForOrder($condition, $orderInfo, $userId)
    {
        $chances = 0;

        switch ($condition->type) {
            case LotteryEnum::CONDITION_TYPE_BUY_GOODS:
                if (static::validateGoodsCondition($condition, $orderInfo)) {
                    $chances = static::getRewardTimes($condition);
                }
                break;

            case LotteryEnum::CONDITION_TYPE_ORDER_AMOUNT:
                if (static::validateOrderAmountCondition($condition, $orderInfo)) {
                    $chances = static::getRewardTimes($condition);
                    
                    // 如果可重复获得，根据金额倍数计算次数
                    if (static::canRepeat($condition)) {
                        $multiple = floor($orderInfo['total_amount'] / $condition->condition_value);
                        $chances *= $multiple;
                    }
                }
                break;

            case LotteryEnum::CONDITION_TYPE_TOTAL_AMOUNT:
                if (static::validateAccumulateCondition($condition, $userId, $condition->activity_id)) {
                    // 检查是否已经因为累计消费获得过机会
                    if (!static::hasGrantedForAccumulate($condition->activity_id, $userId)) {
                        $chances = static::getRewardTimes($condition);
                    }
                }
                break;
        }

        return $chances;
    }

    /**
     * 处理充值条件
     * 
     * @param LotteryCondition $condition 条件对象
     * @param array $rechargeInfo 充值信息
     * @param int $userId 用户ID
     * @return int 获得的抽奖机会数量
     */
    private static function processConditionForRecharge($condition, $rechargeInfo, $userId)
    {
        $chances = 0;
        
        if (static::validateRechargeCondition($condition, ['type' => 'recharge', 'amount' => $rechargeInfo['amount']])) {
            $chances = static::getRewardTimes($condition);
            
            // 如果可重复获得，根据金额倍数计算次数
            if (static::canRepeat($condition)) {
                $multiple = floor($rechargeInfo['amount'] / $condition->condition_value);
                $chances *= $multiple;
            }
        }

        return $chances;
    }

    // ============ 用户资格检查方法 ============

    /**
     * 检查用户资格
     * 
     * @param LotteryActivity $activity 活动对象
     * @param int $userId 用户ID
     * @return bool
     */
    private static function checkUserQualification($activity, $userId)
    {
        // 检查用户群体限制
        switch ($activity->user_limit_type) {
            case LotteryEnum::USER_LIMIT_ALL:
                return true;
            case LotteryEnum::USER_LIMIT_LEVEL:
                return static::checkUserLevel($userId, $activity->user_limit_value);
            case LotteryEnum::USER_LIMIT_TAG:
                return static::checkUserTag($userId, $activity->user_limit_value);
            default:
                return false;
        }
    }

    /**
     * 检查用户等级
     * 
     * @param int $userId 用户ID
     * @param mixed $limitValue 限制值
     * @return bool
     */
    private static function checkUserLevel($userId, $limitValue)
    {
        if (empty($limitValue)) {
            return true;
        }
        
        $user = User::find($userId);
        if (!$user) {
            return false;
        }
        
        $limitLevels = is_array($limitValue) ? $limitValue : [$limitValue];
        return in_array($user->level, $limitLevels);
    }

    /**
     * 检查用户标签
     * 
     * @param int $userId 用户ID
     * @param mixed $limitValue 限制值
     * @return bool
     */
    private static function checkUserTag($userId, $limitValue)
    {
        if (empty($limitValue)) {
            return true;
        }
        
        // TODO: 根据实际的用户标签系统实现
        // 这里需要根据具体的用户标签表结构来实现
        // 暂时返回true，避免影响现有功能
        
        return true;
    }

    /**
     * 检查是否已因累计消费获得过机会
     * 
     * @param int $activityId 活动ID
     * @param int $userId 用户ID
     * @return bool
     */
    private static function hasGrantedForAccumulate($activityId, $userId)
    {
        $userChance = static::getUserChance($activityId, $userId);
        if (!$userChance) {
            return false;
        }
        
        $getDetail = $userChance->get_detail_data;
        foreach ($getDetail as $detail) {
            if (($detail['trigger_type'] ?? '') === static::TRIGGER_TYPE_ACCUMULATE) {
                return true;
            }
        }
        
        return false;
    }

    // ============ 条件验证方法 ============

    /**
     * 验证订单是否满足条件
     * 
     * @param LotteryCondition $condition 条件对象
     * @param array $orderInfo 订单信息
     * @return bool
     */
    public static function validateOrder(LotteryCondition $condition, $orderInfo)
    {
        switch ($condition->type) {
            case LotteryEnum::CONDITION_TYPE_BUY_GOODS:
                return static::validateGoodsCondition($condition, $orderInfo);
            case LotteryEnum::CONDITION_TYPE_ORDER_AMOUNT:
                return static::validateOrderAmountCondition($condition, $orderInfo);
            case LotteryEnum::CONDITION_TYPE_RECHARGE_AMOUNT:
                return static::validateRechargeCondition($condition, $orderInfo);
            default:
                return false;
        }
    }

    /**
     * 验证商品条件
     * 
     * @param LotteryCondition $condition 条件对象
     * @param array $orderInfo 订单信息
     * @return bool
     */
    public static function validateGoodsCondition(LotteryCondition $condition, $orderInfo)
    {
        if (empty($orderInfo['goods']) || empty($condition->goods_ids_list)) {
            return false;
        }

        $orderGoodsIds = array_column($orderInfo['goods'], 'goods_id');
        $conditionGoodsIds = $condition->goods_ids_list;
        $intersection = array_intersect($orderGoodsIds, $conditionGoodsIds);

        if ($condition->goods_rule == LotteryEnum::GOODS_RULE_INCLUDE) {
            // 指定商品参与：订单中必须包含指定商品
            return !empty($intersection);
        } else {
            // 指定商品不可参与：订单中不能包含指定商品
            return empty($intersection);
        }
    }

    /**
     * 验证订单金额条件
     * 
     * @param LotteryCondition $condition 条件对象
     * @param array $orderInfo 订单信息
     * @return bool
     */
    public static function validateOrderAmountCondition(LotteryCondition $condition, $orderInfo)
    {
        $orderAmount = $orderInfo['total_amount'] ?? 0;
        return $orderAmount >= $condition->condition_value;
    }

    /**
     * 验证充值条件
     * 
     * @param LotteryCondition $condition 条件对象
     * @param array $orderInfo 订单信息
     * @return bool
     */
    public static function validateRechargeCondition(LotteryCondition $condition, $orderInfo)
    {
        if (($orderInfo['type'] ?? '') !== 'recharge') {
            return false;
        }
        
        $rechargeAmount = $orderInfo['amount'] ?? 0;
        return $rechargeAmount >= $condition->condition_value;
    }

    /**
     * 验证累计消费条件
     * 
     * @param LotteryCondition $condition 条件对象
     * @param int $userId 用户ID
     * @param int $activityId 活动ID
     * @return bool
     */
    public static function validateAccumulateCondition(LotteryCondition $condition, $userId, $activityId)
    {
        $activity = LotteryActivity::find($activityId);
        if (!$activity) {
            return false;
        }

        // 计算活动期间用户累计消费
        $totalAmount = Order::where('user_id', $userId)
                           ->where('status', 'paid')
                           ->where('createtime', '>=', $activity->start_time)
                           ->where('createtime', '<=', $activity->end_time)
                           ->sum('total_amount');

        return $totalAmount >= $condition->condition_value;
    }

    // ============ 条件管理方法 ============

    /**
     * 获取活动的有效条件
     * 
     * @param int $activityId 活动ID
     * @return array
     */
    public static function getValidConditions($activityId)
    {
        return LotteryCondition::where('activity_id', $activityId)
                              ->where('status', 1)
                              ->order('id', 'asc')
                              ->select();
        }

    /**
     * 检查条件是否可重复获得奖励
     * 
     * @param LotteryCondition $condition 条件对象
     * @return bool
     */
    public static function canRepeat(LotteryCondition $condition)
    {
        return $condition->is_repeatable == 1;
    }

    /**
     * 获取奖励次数
     * 
     * @param LotteryCondition $condition 条件对象
     * @return int
     */
    public static function getRewardTimes(LotteryCondition $condition)
    {
        return $condition->reward_times ?: 1;
    }

    /**
     * 批量验证订单条件
     * 
     * @param int $activityId 活动ID
     * @param array $orderInfo 订单信息
     * @param int $userId 用户ID
     * @return array 满足的条件列表
     */
    public static function batchValidateConditions($activityId, $orderInfo, $userId)
    {
        $conditions = static::getValidConditions($activityId);
        $validConditions = [];

        foreach ($conditions as $condition) {
            if (static::validateOrder($condition, $orderInfo)) {
                $validConditions[] = [
                    'condition_id' => $condition->id,
                    'condition_name' => $condition->name,
                    'condition_type' => $condition->type,
                    'condition_type_text' => $condition->type_text,
                    'reward_times' => static::getRewardTimes($condition),
                    'can_repeat' => static::canRepeat($condition)
        ];
            }
        }

        return $validConditions;
    }

    /**
     * 获取条件统计信息
     * 
     * @param int $activityId 活动ID
     * @return array
     */
    public static function getConditionStatistics($activityId)
    {
        $conditions = static::getValidConditions($activityId);
        $statistics = [
            'total_conditions' => count($conditions),
            'goods_conditions' => 0,
            'amount_conditions' => 0,
            'recharge_conditions' => 0,
            'accumulate_conditions' => 0
        ];

        foreach ($conditions as $condition) {
            switch ($condition->type) {
                case LotteryEnum::CONDITION_TYPE_BUY_GOODS:
                    $statistics['goods_conditions']++;
                    break;
                case LotteryEnum::CONDITION_TYPE_ORDER_AMOUNT:
                    $statistics['amount_conditions']++;
                    break;
                case LotteryEnum::CONDITION_TYPE_RECHARGE_AMOUNT:
                    $statistics['recharge_conditions']++;
                    break;
                case LotteryEnum::CONDITION_TYPE_TOTAL_AMOUNT:
                    $statistics['accumulate_conditions']++;
                    break;
            }
        }

        return $statistics;
    }

    // ============ 用户机会管理方法 ============

    /**
     * 获取用户抽奖机会
     * 
     * @param int $activityId 活动ID
     * @param int $userId 用户ID
     * @return LotteryUserChance|null
     */
    public static function getUserChance($activityId, $userId)
    {
        return LotteryUserChance::where('activity_id', $activityId)
                                ->where('user_id', $userId)
                                ->find();
    }

    /**
     * 获取用户在指定活动中的抽奖机会详情
     * 
     * @param int $activityId 活动ID
     * @param int $userId 用户ID
     * @return array
     */
    public static function getUserChanceDetail($activityId, $userId)
    {
        $userChance = static::getUserChance($activityId, $userId);
        
        if (!$userChance) {
            return [
                'total_chances' => 0,
                'used_chances' => 0,
                'remain_chances' => 0,
                'get_detail' => []
            ];
        }

        return [
            'total_chances' => $userChance->total_chances,
            'used_chances' => $userChance->used_chances,
            'remain_chances' => $userChance->remain_chances,
            'last_get_time' => $userChance->last_get_time,
            'last_use_time' => $userChance->last_use_time,
            'get_detail' => $userChance->get_detail_data
        ];
    }

    /**
     * 给用户分发抽奖机会
     * 
     * @param int $activityId 活动ID
     * @param int $userId 用户ID
     * @param int $chances 机会次数
     * @param array $detail 获得详情
     * @return LotteryUserChance|bool
     */
    private static function grantChanceToUser($activityId, $userId, $chances, $detail)
    {
        return static::addChance($activityId, $userId, $chances, $detail);
    }

    /**
     * 增加抽奖机会
     * 
     * @param int $activityId 活动ID
     * @param int $userId 用户ID
     * @param int $times 机会次数
     * @param array $detail 获得详情
     * @return LotteryUserChance|bool
     */
    public static function addChance($activityId, $userId, $times = 1, $detail = [])
    {
        if ($times <= 0) {
            return false;
        }

        $chance = static::getUserChance($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 LotteryUserChance::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
     * 
     * @param LotteryUserChance $userChance 用户机会对象
     * @param int $times 使用次数
     * @return bool
     */
    public static function useChance(LotteryUserChance $userChance, $times = 1)
    {
        if ($userChance->remain_chances < $times) {
            return false;
        }
        
        $userChance->used_chances += $times;
        $userChance->remain_chances -= $times;
        $userChance->last_use_time = time();
        
        return $userChance->save();
    }

    /**
     * 检查是否有剩余机会
     * 
     * @param LotteryUserChance $userChance 用户机会对象
     * @param int $times 需要的机会次数
     * @return bool
     */
    public static function hasChance(LotteryUserChance $userChance, $times = 1)
    {
        return $userChance->remain_chances >= $times;
    }

    /**
     * 重置抽奖机会（用于测试或特殊情况）
     * 
     * @param LotteryUserChance $userChance 用户机会对象
     * @return bool
     */
    public static function resetChance(LotteryUserChance $userChance)
    {
        $userChance->used_chances = 0;
        $userChance->remain_chances = $userChance->total_chances;
        return $userChance->save();
    }

    // ============ 统计和查询方法 ============

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

    /**
     * 获取用户在多个活动中的机会统计
     * 
     * @param int $userId 用户ID
     * @param array $activityIds 活动ID数组
     * @return array
     */
    public static function getUserChancesStats($userId, $activityIds = [])
    {
        $query = LotteryUserChance::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();
    }

    /**
     * 获取用户在所有活动中的机会概览
     * 
     * @param int $userId 用户ID
     * @return array
     */
    public static function getUserAllChancesOverview($userId)
    {
        $chances = LotteryUserChance::where('user_id', $userId)
                                   ->with(['activity'])
                                   ->select();

        $overview = [
            'total_activities' => count($chances),
            'total_chances' => 0,
            'total_used' => 0,
            'total_remain' => 0,
            'activities' => []
        ];

        foreach ($chances as $chance) {
            $overview['total_chances'] += $chance->total_chances;
            $overview['total_used'] += $chance->used_chances;
            $overview['total_remain'] += $chance->remain_chances;

            $overview['activities'][] = [
                'activity_id' => $chance->activity_id,
                'activity_name' => $chance->activity->name ?? '',
                'total_chances' => $chance->total_chances,
                'used_chances' => $chance->used_chances,
                'remain_chances' => $chance->remain_chances,
                'last_get_time' => $chance->last_get_time,
                'last_use_time' => $chance->last_use_time
            ];
        }

        return $overview;
    }

    /**
     * 检查用户是否可以参与活动
     * 
     * @param int $activityId 活动ID
     * @param int $userId 用户ID
     * @return bool
     */
    public static function canUserParticipate($activityId, $userId)
    {
        $userChance = static::getUserChance($activityId, $userId);
        return $userChance && static::hasChance($userChance, 1);
    }

    /**
     * 获取活动参与用户列表
     * 
     * @param int $activityId 活动ID
     * @param int $page 页码
     * @param int $limit 每页数量
     * @return array
     */
    public static function getActivityParticipantsList($activityId, $page = 1, $limit = 20)
    {
        return LotteryUserChance::where('activity_id', $activityId)
                                ->with(['user'])
                                ->order('createtime', 'desc')
                                ->page($page, $limit)
                                ->select();
    }

    /**
     * 获取活动参与统计
     * 
     * @param int $activityId 活动ID
     * @return array
     */
    public static function getActivityParticipationStats($activityId)
    {
        $stats = LotteryUserChance::where('activity_id', $activityId)
                                  ->field([
                                      'COUNT(*) as total_participants',
                                      'SUM(total_chances) as total_chances_granted',
                                      'SUM(used_chances) as total_chances_used',
                                      'SUM(remain_chances) as total_chances_remain'
                                  ])
                                  ->find();

        return [
            'total_participants' => $stats['total_participants'] ?? 0,
            'total_chances_granted' => $stats['total_chances_granted'] ?? 0,
            'total_chances_used' => $stats['total_chances_used'] ?? 0,
            'total_chances_remain' => $stats['total_chances_remain'] ?? 0,
            'usage_rate' => $stats['total_chances_granted'] > 0 ? 
                           round(($stats['total_chances_used'] / $stats['total_chances_granted']) * 100, 2) : 0
        ];
    }

    // ============ 批量操作方法 ============

    /**
     * 批量创建用户机会（用于活动启动时）
     * 
     * @param int $activityId 活动ID
     * @param array $userIds 用户ID数组
     * @param int $times 机会次数
     * @return bool
     */
    public static function batchCreateChances($activityId, $userIds, $times = 1)
    {
        if (empty($userIds)) {
            return false;
        }

        $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 LotteryUserChance::insertAll($data);
    }

    /**
     * 批量检查用户资格
     * 
     * @param int $activityId 活动ID
     * @param array $userIds 用户ID数组
     * @return array 符合条件的用户ID数组
     */
    public static function batchCheckUserQualification($activityId, $userIds)
    {
        $activity = LotteryActivity::find($activityId);
        if (!$activity) {
            return [];
        }

        $qualifiedUsers = [];
        
        foreach ($userIds as $userId) {
            if (static::checkUserQualification($activity, $userId)) {
                $qualifiedUsers[] = $userId;
            }
        }

        return $qualifiedUsers;
    }

    /**
     * 批量验证条件
     * 
     * @param int $activityId 活动ID
     * @param array $orderInfo 订单信息
     * @param array $userIds 用户ID数组
     * @return array 每个用户满足的条件
     */
    public static function batchValidateConditionsForUsers($activityId, $orderInfo, $userIds)
    {
        $results = [];
        
        foreach ($userIds as $userId) {
            $results[$userId] = static::batchValidateConditions($activityId, $orderInfo, $userId);
        }
        
        return $results;
    }
}