<?php

namespace App\Module\Task\Services;

use App\Module\Task\Enums\TASK_STATUS;
use App\Module\Task\Events\TaskCompletedEvent;
use App\Module\Task\Logics\TaskLogic;
use App\Module\Task\Repositorys\TaskRepository;
use App\Module\Task\Repositorys\TaskUserTaskRepository;
use Carbon\Carbon;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;

/**
 * 任务服务类
 *
 * 提供任务相关的核心服务，包括任务查询、接取、完成、奖励领取等功能。
 * 该类是任务模块对外提供服务的主要入口。
 */
class TaskService
{
    /**
     * 任务数据仓库
     *
     * @var TaskRepository
     */
    protected $taskRepository;

    /**
     * 用户任务数据仓库
     *
     * @var TaskUserTaskRepository
     */
    protected $userTaskRepository;

    /**
     * 任务逻辑类
     *
     * @var TaskLogic
     */
    protected $taskLogic;

    /**
     * 构造函数
     *
     * @param TaskRepository $taskRepository
     * @param TaskUserTaskRepository $userTaskRepository
     * @param TaskLogic $taskLogic
     */
    public function __construct(
        TaskRepository $taskRepository,
        TaskUserTaskRepository $userTaskRepository,
        TaskLogic $taskLogic
    ) {
        $this->taskRepository = $taskRepository;
        $this->userTaskRepository = $userTaskRepository;
        $this->taskLogic = $taskLogic;
    }

    /**
     * 获取用户可用的任务列表
     *
     * @param int $userId 用户ID
     * @param string|null $type 任务类型（可选）
     * @param int|null $categoryId 任务分类ID（可选）
     * @param bool $includeCompleted 是否包含已完成的任务
     * @return array 任务列表
     */
    public function getAvailableTasks(int $userId, ?string $type = null, ?int $categoryId = null, bool $includeCompleted = false): array
    {
        // 获取用户信息（可以调用用户模块的服务）
        // $userInfo = UserService::getUserInfo($userId);

        // 获取用户等级
        $userLevel = 1; // 默认等级，实际应从用户信息中获取

        // 获取符合条件的任务
        $tasks = $this->taskRepository->getAvailableTasks($type, $categoryId, $userLevel);

        // 获取用户任务状态
        $userTasks = $this->userTaskRepository->getUserTasks($userId);

        // 将用户任务状态合并到任务数据中
        $result = [];
        foreach ($tasks as $task) {
            $userTask = $userTasks->where('task_id', $task->id)->first();

            // 如果任务已完成且不包含已完成任务，则跳过
            if ($userTask && $userTask->status >= TASK_STATUS::COMPLETED->value && !$includeCompleted) {
                continue;
            }

            // 合并任务数据和用户任务状态
            $taskData = $task;
            $taskData['user_status'] = $userTask ? $userTask['status'] : TASK_STATUS::NOT_ACCEPTED->value;
            $taskData['progress'] = $userTask ? $userTask['progress'] : 0;
            $taskData['completed_at'] = $userTask && $userTask['completed_at'] ? $userTask['completed_at'] : null;
            $taskData['rewarded_at'] = $userTask && $userTask['rewarded_at'] ? $userTask['rewarded_at'] : null;

            // 获取任务奖励
            $taskData['rewards'] = $this->taskLogic->getTaskRewardInfo($task['id'])['rewards'];

            $result[] = $taskData;
        }

        return $result;
    }

    /**
     * 接取任务
     *
     * @param int $userId 用户ID
     * @param int $taskId 任务ID
     * @return \UCore\Dto\Res 接取结果
     */
    public function acceptTask(int $userId, int $taskId): \UCore\Dto\Res
    {
        try {
            // 开始事务
            DB::beginTransaction();

            // 获取任务信息
            $task = $this->taskRepository->find($taskId);
            if (!$task || !$task->is_active) {
                throw new \Exception('任务不存在或未激活');
            }

            // 检查任务是否已过期
            if ($task->end_time && Carbon::now()->greaterThan($task->end_time)) {
                throw new \Exception('任务已过期');
            }

            // 检查用户是否已接取该任务
            $userTask = $this->userTaskRepository->getUserTask($userId, $taskId);
            if ($userTask) {
                throw new \Exception('已接取该任务');
            }

            // 检查任务前置条件
            // $this->checkTaskPrerequisites($userId, $task);

            // 检查任务接取消耗
            // $this->checkAndConsumeTaskCosts($userId, $task);

            // 创建用户任务记录
            $userTask = $this->userTaskRepository->createUserTask([
                'user_id' => $userId,
                'task_id' => $taskId,
                'status' => TASK_STATUS::IN_PROGRESS->value,
                'progress' => 0,
                'accepted_at' => Carbon::now(),
            ]);

            // 提交事务
            DB::commit();

            return \UCore\Dto\Res::success('任务接取成功', [
                'user_task' => $userTask,
            ]);
        } catch (\Exception $e) {
            // 回滚事务
            DB::rollBack();

            Log::error('任务接取失败', [
                'user_id' => $userId,
                'task_id' => $taskId,
                'error' => $e->getMessage(),
            ]);

            return \UCore\Dto\Res::error($e->getMessage());
        }
    }

    /**
     * 完成任务
     *
     * @param int $userId 用户ID
     * @param int $taskId 任务ID
     * @return array 完成结果
     */
    public function completeTask(int $userId, int $taskId): array
    {
        try {
            // 开始事务
            DB::beginTransaction();

            // 获取用户任务
            $userTask = $this->userTaskRepository->getUserTask($userId, $taskId);
            if (!$userTask) {
                throw new \Exception('未接取该任务');
            }

            // 检查任务状态
            if ($userTask->status !== TASK_STATUS::IN_PROGRESS->value) {
                throw new \Exception('任务状态不正确');
            }

            // 检查任务进度
            if ($userTask->progress < 100) {
                throw new \Exception('任务进度未达到100%');
            }

            // 更新任务状态
            $userTask->status = TASK_STATUS::COMPLETED->value;
            $userTask->completed_at = Carbon::now();
            $userTask->save();

            // 获取任务信息
            $task = $this->taskRepository->find($taskId);

            // 触发任务完成事件
            event(new TaskCompletedEvent(
                $userId,
                $taskId,
                $task->name,
                $userTask->completed_at,
                true,
                []
            ));

            // 提交事务
            DB::commit();

            return [
                'success' => true,
                'message' => '任务完成成功',
                'user_task' => $userTask,
            ];
        } catch (\Exception $e) {
            // 回滚事务
            DB::rollBack();

            Log::error('任务完成失败', [
                'user_id' => $userId,
                'task_id' => $taskId,
                'error' => $e->getMessage(),
            ]);

            return [
                'success' => false,
                'message' => $e->getMessage(),
            ];
        }
    }

    /**
     * 领取任务奖励
     *
     * @param int $userId 用户ID
     * @param int $taskId 任务ID
     * @return \UCore\Dto\Res 领取结果
     */
    public function claimTaskReward(int $userId, int $taskId): \UCore\Dto\Res
    {
        return $this->taskLogic->claimTaskReward($userId, $taskId);
    }

    /**
     * 获取任务奖励信息
     *
     * @param int $taskId 任务ID
     * @return \UCore\Dto\Res 奖励信息
     */
    public function getTaskRewardInfo(int $taskId): \UCore\Dto\Res
    {
        return $this->taskLogic->getTaskRewardInfo($taskId);
    }

    /**
     * 迁移任务奖励到奖励组
     *
     * @param int $taskId 任务ID
     * @return array 迁移结果
     */
    public function migrateTaskReward(int $taskId): array
    {
        return $this->taskLogic->migrateTaskReward($taskId);
    }

    /**
     * 获取任务详情
     *
     * @param int $userId 用户ID
     * @param int $taskId 任务ID
     * @return array 任务详情
     */
    public function getTaskDetail(int $userId, int $taskId): array
    {
        // 获取任务信息
        $task = $this->taskRepository->find($taskId);
        if (!$task) {
            return [
                'success' => false,
                'message' => '任务不存在',
            ];
        }

        // 获取用户任务状态
        $userTask = $this->userTaskRepository->getUserTask($userId, $taskId);

        // 获取任务奖励
        $rewards = $this->taskLogic->getTaskRewardInfo($taskId)['rewards'];

        // 构建任务详情
        $taskDetail = $task->toArray();
        $taskDetail['user_status'] = $userTask ? $userTask->status : TASK_STATUS::NOT_ACCEPTED->value;
        $taskDetail['progress'] = $userTask ? $userTask->progress : 0;
        $taskDetail['completed_at'] = $userTask && $userTask->completed_at ? $userTask->completed_at : null;
        $taskDetail['rewarded_at'] = $userTask && $userTask->rewarded_at ? $userTask->rewarded_at : null;
        $taskDetail['rewards'] = $rewards;

        return [
            'success' => true,
            'task' => $taskDetail,
        ];
    }

    /**
     * 放弃任务
     *
     * @param int $userId 用户ID
     * @param int $taskId 任务ID
     * @return array 放弃结果
     */
    public function abandonTask(int $userId, int $taskId): array
    {
        try {
            // 获取用户任务
            $userTask = $this->userTaskRepository->getUserTask($userId, $taskId);
            if (!$userTask) {
                throw new \Exception('未接取该任务');
            }

            // 检查任务状态
            if ($userTask->status !== TASK_STATUS::IN_PROGRESS->value) {
                throw new \Exception('只能放弃进行中的任务');
            }

            // 删除用户任务记录
            $userTask->delete();

            return [
                'success' => true,
                'message' => '任务放弃成功',
            ];
        } catch (\Exception $e) {
            Log::error('任务放弃失败', [
                'user_id' => $userId,
                'task_id' => $taskId,
                'error' => $e->getMessage(),
            ]);

            return [
                'success' => false,
                'message' => $e->getMessage(),
            ];
        }
    }

    /**
     * 更新任务进度
     *
     * @param int $userId 用户ID
     * @param int $taskId 任务ID
     * @param int $progress 进度值（0-100）
     * @return array 更新结果
     */
    public function updateTaskProgress(int $userId, int $taskId, int $progress): array
    {
        try {
            // 获取用户任务
            $userTask = $this->userTaskRepository->getUserTask($userId, $taskId);
            if (!$userTask) {
                throw new \Exception('未接取该任务');
            }

            // 检查任务状态
            if ($userTask->status !== TASK_STATUS::IN_PROGRESS->value) {
                throw new \Exception('只能更新进行中的任务进度');
            }

            // 验证进度值
            if ($progress < 0 || $progress > 100) {
                throw new \Exception('进度值必须在0-100之间');
            }

            // 更新任务进度
            $userTask->progress = $progress;
            $userTask->save();

            // 如果进度达到100%，自动完成任务
            if ($progress === 100) {
                return $this->completeTask($userId, $taskId);
            }

            return [
                'success' => true,
                'message' => '任务进度更新成功',
                'progress' => $progress,
            ];
        } catch (\Exception $e) {
            Log::error('任务进度更新失败', [
                'user_id' => $userId,
                'task_id' => $taskId,
                'progress' => $progress,
                'error' => $e->getMessage(),
            ]);

            return [
                'success' => false,
                'message' => $e->getMessage(),
            ];
        }
    }

    /**
     * 批量领取任务奖励
     *
     * @param int $userId 用户ID
     * @param array $taskIds 任务ID列表
     * @return array 领取结果
     */
    public function batchClaimTaskRewards(int $userId, array $taskIds): array
    {
        $results = [];
        $successCount = 0;
        $failCount = 0;

        foreach ($taskIds as $taskId) {
            $result = $this->claimTaskReward($userId, $taskId);
            $results[$taskId] = $result;

            if ($result['success']) {
                $successCount++;
            } else {
                $failCount++;
            }
        }

        return [
            'success' => $failCount === 0,
            'message' => "成功领取{$successCount}个任务奖励，失败{$failCount}个",
            'results' => $results,
        ];
    }
}