package main

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

	"github.com/bytedance/sonic"
	"github.com/gofiber/fiber/v2"
	"github.com/gofiber/fiber/v2/middleware/compress"
	"github.com/gofiber/fiber/v2/middleware/requestid"
	"github.com/google/uuid"
	"github.com/redis/go-redis/v9"
	"go.uber.org/zap"
	"gorm.io/gorm"

	"github.com/break/junhong_cmp_fiber/internal/handler"
	internalMiddleware "github.com/break/junhong_cmp_fiber/internal/middleware"
	"github.com/break/junhong_cmp_fiber/internal/routes"
	accountSvc "github.com/break/junhong_cmp_fiber/internal/service/account"
	permissionSvc "github.com/break/junhong_cmp_fiber/internal/service/permission"
	roleSvc "github.com/break/junhong_cmp_fiber/internal/service/role"
	"github.com/break/junhong_cmp_fiber/internal/store/postgres"
	"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"
)

func main() {
	// 1. 初始化配置
	cfg := initConfig()

	// 2. 初始化日志
	appLogger := initLogger(cfg)
	defer func() {
		_ = logger.Sync()
	}()

	// 3. 初始化数据库
	db := initDatabase(cfg, appLogger)
	defer closeDatabase(db, appLogger)

	// 4. 初始化 Redis
	redisClient := initRedis(cfg, appLogger)
	defer closeRedis(redisClient, appLogger)

	// 5. 初始化队列客户端
	queueClient := initQueue(redisClient, appLogger)
	defer closeQueue(queueClient, appLogger)

	// 6. 初始化 Services
	services := initServices(db, redisClient, appLogger)

	// 7. 启动配置监听器
	watchCtx, cancelWatch := context.WithCancel(context.Background())
	defer cancelWatch()
	go config.Watch(watchCtx, appLogger)

	// 8. 创建 Fiber 应用
	app := createFiberApp(cfg, appLogger)

	// 9. 注册中间件
	initMiddleware(app, cfg, appLogger)

	// 10. 注册路由
	initRoutes(app, cfg, services, queueClient, db, redisClient, appLogger)

	// 11. 启动服务器
	startServer(app, cfg, appLogger, cancelWatch)
}

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

// initLogger 初始化日志
func initLogger(cfg *config.Config) *zap.Logger {
	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())
	}

	appLogger := logger.GetAppLogger()
	appLogger.Info("应用程序启动中...", zap.String("address", cfg.Server.Address))
	return appLogger
}

// initDatabase 初始化数据库连接
func initDatabase(cfg *config.Config, appLogger *zap.Logger) *gorm.DB {
	db, err := database.InitPostgreSQL(&cfg.Database, appLogger)
	if err != nil {
		appLogger.Fatal("初始化 PostgreSQL 失败", zap.Error(err))
	}
	return db
}

// closeDatabase 关闭数据库连接
func closeDatabase(db *gorm.DB, appLogger *zap.Logger) {
	sqlDB, _ := db.DB()
	if sqlDB != nil {
		if err := sqlDB.Close(); err != nil {
			appLogger.Error("关闭 PostgreSQL 连接失败", zap.Error(err))
		}
	}
}

// initRedis 初始化 Redis 连接
func initRedis(cfg *config.Config, appLogger *zap.Logger) *redis.Client {
	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,
	})

	// 测试连接
	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))

	return redisClient
}

// closeRedis 关闭 Redis 连接
func closeRedis(redisClient *redis.Client, appLogger *zap.Logger) {
	if err := redisClient.Close(); err != nil {
		appLogger.Error("关闭 Redis 客户端失败", zap.Error(err))
	}
}

// initQueue 初始化队列客户端
func initQueue(redisClient *redis.Client, appLogger *zap.Logger) *queue.Client {
	return queue.NewClient(redisClient, appLogger)
}

// closeQueue 关闭队列客户端
func closeQueue(queueClient *queue.Client, appLogger *zap.Logger) {
	if err := queueClient.Close(); err != nil {
		appLogger.Error("关闭 Asynq 客户端失败", zap.Error(err))
	}
}

// initServices 初始化所有 Services
func initServices(db *gorm.DB, redisClient *redis.Client, appLogger *zap.Logger) *routes.Services {
	// 初始化 RBAC Store 层
	accountStore := postgres.NewAccountStore(db, redisClient)
	roleStore := postgres.NewRoleStore(db)
	permissionStore := postgres.NewPermissionStore(db)
	accountRoleStore := postgres.NewAccountRoleStore(db)
	rolePermissionStore := postgres.NewRolePermissionStore(db)

	// 初始化 RBAC Service 层
	accountService := accountSvc.New(accountStore, roleStore, accountRoleStore)
	roleService := roleSvc.New(roleStore, permissionStore, rolePermissionStore)
	permissionService := permissionSvc.New(permissionStore)

	// 初始化 Handler 层
	accountHandler := handler.NewAccountHandler(accountService)
	roleHandler := handler.NewRoleHandler(roleService)
	permissionHandler := handler.NewPermissionHandler(permissionService)

	return &routes.Services{
		AccountHandler:    accountHandler,
		RoleHandler:       roleHandler,
		PermissionHandler: permissionHandler,
	}
}

// createFiberApp 创建 Fiber 应用
func createFiberApp(cfg *config.Config, appLogger *zap.Logger) *fiber.App {
	return fiber.New(fiber.Config{
		AppName:       "君鸿卡管系统 v1.0.0",
		StrictRouting: true,
		CaseSensitive: true,
		JSONEncoder:   sonic.Marshal,
		JSONDecoder:   sonic.Unmarshal,
		Prefork:       cfg.Server.Prefork,
		ReadTimeout:   cfg.Server.ReadTimeout,
		WriteTimeout:  cfg.Server.WriteTimeout,
		ErrorHandler:  internalMiddleware.ErrorHandler(appLogger),
	})
}

// initMiddleware 注册中间件
func initMiddleware(app *fiber.App, cfg *config.Config, appLogger *zap.Logger) {
	// 1. Recover - 必须第一个，捕获所有 panic
	app.Use(internalMiddleware.Recover(appLogger))

	// 2. RequestID - 为每个请求生成唯一 ID
	app.Use(requestid.New(requestid.Config{
		Generator: func() string {
			return uuid.NewString()
		},
	}))

	// 3. Logger - 记录所有请求
	app.Use(logger.Middleware())

	// 4. Compress - 响应压缩
	app.Use(compress.New(compress.Config{
		Level: compress.LevelDefault,
	}))
}

// initRoutes 注册路由
func initRoutes(app *fiber.App, cfg *config.Config, services *routes.Services, queueClient *queue.Client, db *gorm.DB, redisClient *redis.Client, appLogger *zap.Logger) {
	// 注册模块化路由
	routes.RegisterRoutes(app, services)

	// API v1 路由组（用于受保护的端点）
	v1 := app.Group("/api/v1")

	// 可选：启用认证中间件
	if cfg.Middleware.EnableAuth {
		// TODO: 配置 TokenValidator
		appLogger.Info("认证中间件已启用")
	}

	// 可选：启用限流器
	if cfg.Middleware.EnableRateLimiter {
		initRateLimiter(v1, cfg, appLogger)
	}
}

// initRateLimiter 初始化限流器
func initRateLimiter(router fiber.Router, cfg *config.Config, appLogger *zap.Logger) {
	var rateLimitStorage fiber.Storage

	if cfg.Middleware.RateLimiter.Storage == "redis" {
		rateLimitStorage = internalMiddleware.NewRedisStorage(
			cfg.Redis.Address,
			cfg.Redis.Password,
			cfg.Redis.DB,
			cfg.Redis.Port,
		)
		appLogger.Info("限流器使用 Redis 存储", zap.String("redis_address", cfg.Redis.Address))
	} else {
		rateLimitStorage = nil
		appLogger.Info("限流器使用内存存储")
	}

	router.Use(internalMiddleware.RateLimiter(
		cfg.Middleware.RateLimiter.Max,
		cfg.Middleware.RateLimiter.Expiration,
		rateLimitStorage,
	))
}

// startServer 启动服务器
func startServer(app *fiber.App, cfg *config.Config, appLogger *zap.Logger, cancelWatch context.CancelFunc) {
	// 优雅关闭
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, os.Interrupt, syscall.SIGTERM)

	go func() {
		if err := app.Listen(cfg.Server.Address); err != nil {
			appLogger.Fatal("服务器启动失败", zap.Error(err))
		}
	}()

	appLogger.Info("服务器已启动", zap.String("address", cfg.Server.Address))

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

	// 取消配置监听器
	cancelWatch()

	// 关闭 HTTP 服务器
	if err := app.ShutdownWithTimeout(cfg.Server.ShutdownTimeout); err != nil {
		appLogger.Error("强制关闭服务器", zap.Error(err))
	}

	appLogger.Info("服务器已停止")
}