package main

import (
	"context"
	"os"
	"os/signal"
	"strconv"
	"syscall"
	"time"

	"github.com/hibiken/asynq"
	"github.com/redis/go-redis/v9"
	"go.uber.org/zap"

	"github.com/break/junhong_cmp_fiber/internal/bootstrap"
	"github.com/break/junhong_cmp_fiber/internal/gateway"
	"github.com/break/junhong_cmp_fiber/internal/polling"
	pollingSvc "github.com/break/junhong_cmp_fiber/internal/service/polling"
	pkgBootstrap "github.com/break/junhong_cmp_fiber/pkg/bootstrap"
	"github.com/break/junhong_cmp_fiber/pkg/config"
	"github.com/break/junhong_cmp_fiber/pkg/database"
	"github.com/break/junhong_cmp_fiber/pkg/logger"
	"github.com/break/junhong_cmp_fiber/pkg/queue"
	"github.com/break/junhong_cmp_fiber/pkg/storage"
)

func main() {
	cfg, err := config.Load()
	if err != nil {
		panic("加载配置失败: " + err.Error())
	}

	if _, err := pkgBootstrap.EnsureDirectories(cfg, nil); err != nil {
		panic("初始化目录失败: " + err.Error())
	}

	if err := logger.InitLoggers(
		cfg.Logging.Level,
		cfg.Logging.Development,
		logger.LogRotationConfig{
			Filename:   cfg.Logging.AppLog.Filename,
			MaxSize:    cfg.Logging.AppLog.MaxSize,
			MaxBackups: cfg.Logging.AppLog.MaxBackups,
			MaxAge:     cfg.Logging.AppLog.MaxAge,
			Compress:   cfg.Logging.AppLog.Compress,
		},
		logger.LogRotationConfig{
			Filename:   cfg.Logging.AccessLog.Filename,
			MaxSize:    cfg.Logging.AccessLog.MaxSize,
			MaxBackups: cfg.Logging.AccessLog.MaxBackups,
			MaxAge:     cfg.Logging.AccessLog.MaxAge,
			Compress:   cfg.Logging.AccessLog.Compress,
		},
	); err != nil {
		panic("初始化日志失败: " + err.Error())
	}
	defer func() {
		_ = logger.Sync() // 忽略 sync 错误
	}()

	appLogger := logger.GetAppLogger()
	appLogger.Info("Worker 服务启动中...")

	// 连接 Redis
	redisAddr := cfg.Redis.Address + ":" + strconv.Itoa(cfg.Redis.Port)
	redisClient := redis.NewClient(&redis.Options{
		Addr:         redisAddr,
		Password:     cfg.Redis.Password,
		DB:           cfg.Redis.DB,
		PoolSize:     cfg.Redis.PoolSize,
		MinIdleConns: cfg.Redis.MinIdleConns,
		DialTimeout:  cfg.Redis.DialTimeout,
		ReadTimeout:  cfg.Redis.ReadTimeout,
		WriteTimeout: cfg.Redis.WriteTimeout,
	})
	defer func() {
		if err := redisClient.Close(); err != nil {
			appLogger.Error("关闭 Redis 客户端失败", zap.Error(err))
		}
	}()

	// 测试 Redis 连接
	ctx := context.Background()
	if err := redisClient.Ping(ctx).Err(); err != nil {
		appLogger.Fatal("连接 Redis 失败", zap.Error(err))
	}
	appLogger.Info("Redis 已连接", zap.String("address", redisAddr))

	// 初始化 PostgreSQL 连接
	db, err := database.InitPostgreSQL(&cfg.Database, appLogger)
	if err != nil {
		appLogger.Fatal("初始化 PostgreSQL 失败", zap.Error(err))
	}
	defer func() {
		sqlDB, _ := db.DB()
		if sqlDB != nil {
			if err := sqlDB.Close(); err != nil {
				appLogger.Error("关闭 PostgreSQL 连接失败", zap.Error(err))
			}
		}
	}()

	// 初始化对象存储服务（可选）
	storageSvc := initStorage(cfg, appLogger)

	// 初始化 Gateway 客户端（可选，用于轮询任务）
	gatewayClient := initGateway(cfg, appLogger)

	// 创建 Asynq 客户端（用于调度器提交任务）
	asynqClient := asynq.NewClient(asynq.RedisClientOpt{
		Addr:     redisAddr,
		Password: cfg.Redis.Password,
		DB:       cfg.Redis.DB,
	})
	defer func() {
		if err := asynqClient.Close(); err != nil {
			appLogger.Error("关闭 Asynq 客户端失败", zap.Error(err))
		}
	}()

	// 创建 Worker 依赖
	workerDeps := &bootstrap.WorkerDependencies{
		DB:             db,
		Redis:          redisClient,
		Logger:         appLogger,
		AsynqClient:    asynqClient,
		StorageService: storageSvc,
		GatewayClient:  gatewayClient,
	}

	// Bootstrap Worker 组件
	workerResult, err := bootstrap.BootstrapWorker(workerDeps)
	if err != nil {
		appLogger.Fatal("Worker Bootstrap 失败", zap.Error(err))
	}

	// 创建 Asynq Worker 服务器
	workerServer := queue.NewServer(redisClient, &cfg.Queue, appLogger)

	// 初始化轮询调度器（在创建 Handler 之前，因为 Handler 需要使用调度器作为回调）
	scheduler := polling.NewScheduler(db, redisClient, asynqClient, appLogger)

	// 注入流量重置服务到调度器
	dataResetHandler := polling.NewDataResetHandler(workerResult.Services.ResetService, appLogger)
	scheduler.SetResetService(dataResetHandler)

	if err := scheduler.Start(ctx); err != nil {
		appLogger.Error("启动轮询调度器失败", zap.Error(err))
	} else {
		appLogger.Info("轮询调度器已启动")
	}

	// 创建任务处理器管理器并注册所有处理器
	taskHandler := queue.NewHandler(db, redisClient, storageSvc, gatewayClient, scheduler, workerResult, asynqClient, appLogger)
	taskHandler.RegisterHandlers()

	appLogger.Info("Worker 服务器配置完成",
		zap.Int("concurrency", cfg.Queue.Concurrency),
		zap.Any("queues", cfg.Queue.Queues))

	// 初始化告警服务并启动告警检查器
	alertChecker := startAlertChecker(ctx, workerResult.Services.AlertService, appLogger)

	// 初始化数据清理服务并启动定时清理任务
	cleanupChecker := startCleanupScheduler(ctx, workerResult.Services.CleanupService, appLogger)

	// 优雅关闭
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, os.Interrupt, syscall.SIGTERM)

	// 启动 Worker 服务器（阻塞运行）
	go func() {
		if err := workerServer.Run(taskHandler.GetMux()); err != nil {
			appLogger.Fatal("Worker 服务器运行失败", zap.Error(err))
		}
	}()

	appLogger.Info("Worker 服务器已启动")

	// 等待关闭信号
	<-quit
	appLogger.Info("正在关闭 Worker 服务器...")

	// 停止告警检查器
	close(alertChecker)

	// 停止数据清理定时任务
	close(cleanupChecker)

	// 停止轮询调度器
	scheduler.Stop()

	// 优雅关闭 Worker 服务器（等待正在执行的任务完成）
	workerServer.Shutdown()

	appLogger.Info("Worker 服务器已停止")
}

func initStorage(cfg *config.Config, appLogger *zap.Logger) *storage.Service {
	if cfg.Storage.Provider == "" || cfg.Storage.S3.Endpoint == "" {
		appLogger.Info("对象存储未配置，跳过初始化")
		return nil
	}

	provider, err := storage.NewS3Provider(&cfg.Storage)
	if err != nil {
		appLogger.Warn("初始化对象存储失败，功能将不可用", zap.Error(err))
		return nil
	}

	appLogger.Info("对象存储已初始化",
		zap.String("provider", cfg.Storage.Provider),
		zap.String("bucket", cfg.Storage.S3.Bucket),
	)

	return storage.NewService(provider, &cfg.Storage)
}

// initGateway 初始化 Gateway 客户端
func initGateway(cfg *config.Config, appLogger *zap.Logger) *gateway.Client {
	if cfg.Gateway.BaseURL == "" {
		appLogger.Info("Gateway 未配置，跳过初始化（轮询任务将无法查询真实数据）")
		return nil
	}

	client := gateway.NewClient(
		cfg.Gateway.BaseURL,
		cfg.Gateway.AppID,
		cfg.Gateway.AppSecret,
	).WithTimeout(time.Duration(cfg.Gateway.Timeout) * time.Second)

	appLogger.Info("Gateway 客户端初始化成功",
		zap.String("base_url", cfg.Gateway.BaseURL),
		zap.String("app_id", cfg.Gateway.AppID))

	return client
}

func startAlertChecker(ctx context.Context, alertService *pollingSvc.AlertService, appLogger *zap.Logger) chan struct{} {
	stopChan := make(chan struct{})

	go func() {
		ticker := time.NewTicker(1 * time.Minute)
		defer ticker.Stop()

		appLogger.Info("告警检查器已启动，检查间隔: 1分钟")

		for {
			select {
			case <-ticker.C:
				if err := alertService.CheckAlerts(ctx); err != nil {
					appLogger.Error("告警检查失败", zap.Error(err))
				}
			case <-stopChan:
				appLogger.Info("告警检查器已停止")
				return
			case <-ctx.Done():
				appLogger.Info("告警检查器因 context 取消而停止")
				return
			}
		}
	}()

	return stopChan
}

func startCleanupScheduler(ctx context.Context, cleanupService *pollingSvc.CleanupService, appLogger *zap.Logger) chan struct{} {
	stopChan := make(chan struct{})

	go func() {
		calcNextRun := func() time.Duration {
			now := time.Now()
			next := time.Date(now.Year(), now.Month(), now.Day(), 2, 0, 0, 0, now.Location())
			if now.After(next) {
				next = next.Add(24 * time.Hour)
			}
			return time.Until(next)
		}

		timer := time.NewTimer(calcNextRun())
		defer timer.Stop()

		appLogger.Info("数据清理定时任务已启动，每天凌晨2点执行")

		for {
			select {
			case <-timer.C:
				appLogger.Info("开始执行定时数据清理")
				if err := cleanupService.RunScheduledCleanup(ctx); err != nil {
					appLogger.Error("定时数据清理失败", zap.Error(err))
				}
				timer.Reset(calcNextRun())
			case <-stopChan:
				appLogger.Info("数据清理定时任务已停止")
				return
			case <-ctx.Done():
				appLogger.Info("数据清理定时任务因 context 取消而停止")
				return
			}
		}
	}()

	return stopChan
}