<?php

namespace app\common\Service;

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 think\Exception;

/**
 * 抽奖机会服务类
 * 处理用户获得抽奖机会的逻辑
 */
class LotteryChanceService
{
    /**
     * 订单完成后检查并分发抽奖机会
     * @param array $orderInfo 订单信息
     * @param int $userId 用户ID
     * @return array 获得的抽奖机会信息
     */
    public static function checkAndGrantChanceForOrder($orderInfo, $userId)
    {
        $grantedChances = [];
        
        // 获取所有正在进行的抽奖活动
        $activities = LotteryActivity::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
                    ];
                }
            } 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: ' . $e->getMessage(), 'error');
            }
        }
        
        return $grantedChances;
    }

    /**
     * 充值完成后检查并分发抽奖机会
     * @param array $rechargeInfo 充值信息
     * @param int $userId 用户ID
     * @return array 获得的抽奖机会信息
     */
    public static function checkAndGrantChanceForRecharge($rechargeInfo, $userId)
    {
        $grantedChances = [];
        
        // 获取所有正在进行的抽奖活动
        $activities = LotteryActivity::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
                    ];
                }
            } 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: ' . $e->getMessage(), 'error');
            }
        }
        
        return $grantedChances;
    }

    /**
     * 处理订单相关的活动
     */
    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
        $conditions = LotteryCondition::getValidConditions($activity->id);
        $totalChances = 0;

        foreach ($conditions as $condition) {
            // 跳过充值条件
            if ($condition->type == LotteryCondition::TYPE_RECHARGE) {
                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' => '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
     */
    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
        $conditions = LotteryCondition::getValidConditions($activity->id);
        $totalChances = 0;

        foreach ($conditions as $condition) {
            // 只处理充值条件
            if ($condition->type != LotteryCondition::TYPE_RECHARGE) {
                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' => 'recharge',
                'recharge_amount' => $rechargeInfo['amount'] ?? 0,
                'granted_time' => time()
            ]);
        }

        return $totalChances;
    }

    /**
     * 处理订单条件
     */
    private static function processConditionForOrder($condition, $orderInfo, $userId)
    {
        $chances = 0;

        switch ($condition->type) {
            case LotteryCondition::TYPE_GOODS:
                if ($condition->validateOrder($orderInfo)) {
                    $chances = $condition->getRewardTimes();
                }
                break;

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

            case LotteryCondition::TYPE_ACCUMULATE:
                if ($condition->validateAccumulateCondition($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 = $condition->getRewardTimes();
                    }
                }
                break;
        }

        return $chances;
    }

    /**
     * 处理充值条件
     */
    private static function processConditionForRecharge($condition, $rechargeInfo, $userId)
    {
        $chances = 0;
        
        if ($condition->validateOrder(['type' => 'recharge', 'amount' => $rechargeInfo['amount']])) {
            $chances = $condition->getRewardTimes();
            
            // 如果可重复获得，根据金额倍数计算次数
            if ($condition->canRepeat()) {
                $multiple = floor($rechargeInfo['amount'] / $condition->condition_value);
                $chances *= $multiple;
            }
        }

        return $chances;
    }

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

    /**
     * 检查用户等级
     */
    private static function checkUserLevel($userId, $limitValue)
    {
        if (empty($limitValue)) {
            return true;
        }
        
        $user = \app\common\model\User::find($userId);
        return $user && in_array($user->level, (array)$limitValue);
    }

    /**
     * 检查用户标签
     */
    private static function checkUserTag($userId, $limitValue)
    {
        if (empty($limitValue)) {
            return true;
        }
        
        // 这里需要根据实际的用户标签系统实现
        // 暂时返回true
        return true;
    }

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

    /**
     * 给用户分发抽奖机会
     */
    private static function grantChanceToUser($activityId, $userId, $chances, $detail)
    {
        return LotteryUserChance::addChance($activityId, $userId, $chances, $detail);
    }

    /**
     * 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 $adminId 管理员ID
     * @return bool
     */
    public static function manualGrantChance($activityId, $userId, $chances, $reason, $adminId)
    {
        $activity = LotteryActivity::find($activityId);
        if (!$activity) {
            throw new Exception('活动不存在');
        }

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

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

    /**
     * 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)
    {
        $userChance = LotteryUserChance::getUserChance($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
        ];
    }

    /**
     * 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 $initChances 初始机会数
     * @return bool
     */
    public static function batchInitChances($activityId, $userIds, $initChances = 1)
    {
        $activity = LotteryActivity::find($activityId);
        if (!$activity) {
            throw new Exception('活动不存在');
        }

        return LotteryUserChance::batchCreateChances($activityId, $userIds, $initChances);
    }
}