package main

import (
	"flag"
	"fmt"
	"os"
	"os/signal"
	"strconv"
	"syscall"

	_ "dubbo.apache.org/dubbo-go/v3/imports"
	"dubbo.apache.org/dubbo-go/v3/protocol"
	"dubbo.apache.org/dubbo-go/v3/server"

	"github.com/topfans/backend/pkg/database"
	"github.com/topfans/backend/pkg/health"
	"github.com/topfans/backend/pkg/logger"
	"github.com/topfans/backend/pkg/models"
	pb "github.com/topfans/backend/pkg/proto/user"
	"github.com/topfans/backend/services/userService/provider"
	"github.com/topfans/backend/services/userService/repository"
	"github.com/topfans/backend/services/userService/service"
)

var (
	port       = flag.Int("port", getEnvInt("PORT", 20000), "Dubbo service port")
	dbHost     = flag.String("db-host", getEnv("DB_HOST", "localhost"), "Database host")
	dbPort     = flag.Int("db-port", getEnvInt("DB_PORT", 5432), "Database port")
	dbUser     = flag.String("db-user", getEnv("DB_USER", "postgres"), "Database user")
	dbPassword = flag.String("db-password", getEnv("DB_PASSWORD", ""), "Database password")
	dbName     = flag.String("db-name", getEnv("DB_NAME", "top-fans"), "Database name")
	healthHandler *health.Handler
)

func getEnv(key, fallback string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return fallback
}

func getEnvInt(key string, fallback int) int {
	if v := os.Getenv(key); v != "" {
		if n, err := strconv.Atoi(v); err == nil {
			return n
		}
	}
	return fallback
}

func main() {
	flag.Parse()

	// 初始化日志（必须在最前面）
	env := os.Getenv("ENV")
	if env == "" {
		env = "development"
	}

	if err := logger.Init(logger.Config{
		ServiceName: "user-service",
		Environment: env,
		LogLevel:    os.Getenv("LOG_LEVEL"),
	}); err != nil {
		panic(fmt.Sprintf("Failed to initialize logger: %v", err))
	}
	defer logger.Sync()

	logger.Sugar.Info("Starting User Service...")

	// 初始化数据库
	if err := initDatabase(); err != nil {
		logger.Sugar.Fatalf("Failed to initialize database: %v", err)
	}

	// 自动迁移数据库表
	if err := autoMigrate(); err != nil {
		logger.Sugar.Fatalf("Failed to migrate database: %v", err)
	}

	// 初始化 Dubbo-go 服务器
	if err := initDubboService(); err != nil {
		logger.Sugar.Fatalf("Failed to initialize Dubbo service: %v", err)
	}

	// 等待信号（优雅关闭）
	logger.Sugar.Info("Dubbo-go service started successfully. Press Ctrl+C to exit.")
	gracefulShutdown()
}

// initDatabase 初始化数据库连接
func initDatabase() error {
	config := database.Config{
		Host:     *dbHost,
		Port:     *dbPort,
		User:     *dbUser,
		Password: *dbPassword,
		DBName:   *dbName,
		SSLMode:  "disable",
		TimeZone: "Asia/Shanghai",
	}

	return database.Init(config)
}

// autoMigrate 自动迁移数据库表
func autoMigrate() error {
	db := database.GetDB()
	if db == nil {
		return fmt.Errorf("database is not initialized")
	}

	// 按顺序迁移（考虑外键依赖）
	tables := []interface{}{
		&models.Star{},
		&models.User{},
		&models.FanProfile{},
	}

	for _, table := range tables {
		if err := db.AutoMigrate(table); err != nil {
			return fmt.Errorf("failed to migrate table: %w", err)
		}
	}

	logger.Sugar.Info("Database migration completed successfully")
	return nil
}

// gracefulShutdown 优雅关闭
func gracefulShutdown() {
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit

	logger.Sugar.Info("Shutting down server...")

	// 关闭健康检查服务器
	if healthHandler != nil {
		healthHandler.Stop()
	}

	// 关闭数据库连接
	if err := database.Close(); err != nil {
		logger.Sugar.Errorf("Error closing database: %v", err)
	}

	logger.Sugar.Info("Server exited")
}

// initDubboService 初始化Dubbo-go服务
func initDubboService() error {
	// 启动健康检查 HTTP 服务器
	healthPort := *port + 1000 // e.g., 20000 -> 21000
	healthHandler = health.NewHandler("user-service", healthPort)
	healthHandler.Start()

	db := database.GetDB()
	if db == nil {
		return fmt.Errorf("database is not initialized")
	}

	// 创建Repository实例
	userRepo := repository.NewUserRepository()
	fanProfileRepo := repository.NewFanProfileRepository()
	starRepo := repository.NewStarRepository()

	// 创建Service实例
	authService := service.NewAuthService(userRepo, fanProfileRepo, starRepo, db)
	userService := service.NewUserService(userRepo, fanProfileRepo, db)
	identityService := service.NewIdentityService(fanProfileRepo, starRepo, userRepo, db)

	// 创建Provider实例
	authProvider := provider.NewAuthProvider(authService)
	userProvider := provider.NewUserProvider(userService, identityService)

	// 创建统一Provider实例（作为集成层，委托给其他Provider）
	unifiedProvider := provider.NewUnifiedProvider(authProvider, userProvider)

	// 使用编程式注册方式（参考 dubbo-go-samples/helloworld）
	// 创建 Dubbo Server
	srv, err := server.NewServer(
		server.WithServerProtocol(
			protocol.WithPort(20000),
			protocol.WithTriple(),
		),
	)
	if err != nil {
		return fmt.Errorf("failed to create Dubbo server: %w", err)
	}

	// 使用 Triple 协议生成的 RegisterHandler 函数注册服务
	if err := pb.RegisterUserSocialServiceHandler(srv, unifiedProvider); err != nil {
		return fmt.Errorf("failed to register UserSocialService handler: %w", err)
	}

	logger.Sugar.Info("Dubbo-go unified provider registered successfully",
		"service", "topfans.user.UserSocialService",
		"port", 20000,
	)

	// 在后台启动 Dubbo 服务器
	go func() {
		if err := srv.Serve(); err != nil {
			logger.Sugar.Fatalf("Failed to serve Dubbo: %v", err)
		}
	}()

	return nil
}