package main

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

	"dubbo.apache.org/dubbo-go/v3/client"
	_ "dubbo.apache.org/dubbo-go/v3/imports"
	"dubbo.apache.org/dubbo-go/v3/protocol"
	"dubbo.apache.org/dubbo-go/v3/server"
	"github.com/joho/godotenv"

	"github.com/topfans/backend/pkg/database"
	"github.com/topfans/backend/pkg/logger"
	"github.com/topfans/backend/pkg/models"
	pbAsset "github.com/topfans/backend/pkg/proto/asset"
	pbRanking "github.com/topfans/backend/pkg/proto/ranking"
	pbUser "github.com/topfans/backend/pkg/proto/user"
	assetClient "github.com/topfans/backend/services/assetService/client"
	"github.com/topfans/backend/services/assetService/config"
	"github.com/topfans/backend/services/assetService/provider"
	"github.com/topfans/backend/services/assetService/repository"
	"github.com/topfans/backend/services/assetService/service"
)

var (
	port           = flag.Int("port", getEnvInt("PORT", 20003), "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")
	userServiceURL = flag.String("user-service-url", getEnv("USER_SERVICE_URL", "tri://localhost:20000"), "User service URL")
)

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() {
	// 加载 .env 文件中的环境变量
	godotenv.Load()

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

	logger.Logger.Info("Starting Asset Service...")

	// 初始化数据库
	dbConfig := database.Config{
		Host:     *dbHost,
		Port:     *dbPort,
		User:     *dbUser,
		Password: *dbPassword,
		DBName:   *dbName,
		SSLMode:  "disable",
		TimeZone: "Asia/Shanghai",
	}

	if err := database.Init(dbConfig); err != nil {
		logger.Logger.Fatal(fmt.Sprintf("Failed to initialize database: %v", err))
	}
	logger.Logger.Info("Database initialized successfully")

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

	// 创建 Repository 层实例
	assetRepo := repository.NewAssetRepository(database.GetDB())
	mintOrderRepo := repository.NewMintOrderRepository(database.GetDB())
	assetLikeRepo := repository.NewAssetLikeRepository(database.GetDB())
	rankingRepo := repository.NewRankingRepository(database.GetDB())
	logger.Logger.Info("Repository layer initialized")

	// 创建 Dubbo 客户端
	cli, err := client.NewClient(
		client.WithClientURL(*userServiceURL),
	)
	if err != nil {
		logger.Logger.Fatal(fmt.Sprintf("Failed to create Dubbo client: %v", err))
	}

	// 获取 User Service RPC 客户端
	userServiceClient, err := pbUser.NewUserSocialService(cli)
	if err != nil {
		logger.Logger.Fatal(fmt.Sprintf("Failed to create User Service RPC client: %v", err))
	}
	userClient := assetClient.NewUserServiceClient(userServiceClient)
	logger.Logger.Info("User Service RPC client initialized")

	// 创建 Service 层实例
	assetService := service.NewAssetService(assetRepo, mintOrderRepo, assetLikeRepo, userClient, database.GetDB())
	mintService := service.NewMintService(assetRepo, mintOrderRepo, userClient, database.GetDB(), config.GlobalAssetConfig)
	assetLikeService := service.NewAssetLikeService(assetRepo, assetLikeRepo, database.GetDB())
	rankingService := service.NewRankingService(rankingRepo, userClient)
	logger.Logger.Info("Service layer initialized")

	// 创建 Provider 层实例
	assetProvider := provider.NewAssetProvider(assetService, mintService, assetLikeService)
	rankingProvider := provider.NewRankingProvider(rankingService)
	logger.Logger.Info("Provider layer initialized")

	// 创建 Dubbo 服务器
	srv, err := server.NewServer(
		server.WithServerProtocol(
			protocol.WithPort(*port),
			protocol.WithTriple(),
		),
	)
	if err != nil {
		logger.Logger.Fatal(fmt.Sprintf("Failed to create Dubbo server: %v", err))
	}

	// 使用 Triple 协议生成的 RegisterHandler 函数注册服务
	if err := pbAsset.RegisterAssetServiceHandler(srv, assetProvider); err != nil {
		logger.Logger.Fatal(fmt.Sprintf("Failed to register Asset Service: %v", err))
	}

	// 注册 Ranking Service
	if err := pbRanking.RegisterRankingServiceHandler(srv, rankingProvider); err != nil {
		logger.Logger.Fatal(fmt.Sprintf("Failed to register Ranking Service: %v", err))
	}

	// 启动服务
	if err := srv.Serve(); err != nil {
		logger.Logger.Fatal(fmt.Sprintf("Failed to start Asset Service: %v", err))
	}

	logger.Logger.Info(fmt.Sprintf("Asset Service started successfully on port %d", *port))

	// 等待退出信号
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit

	logger.Logger.Info("Shutting down Asset Service...")
}

// 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")
	}

	// 按顺序迁移资产相关表
	tables := []interface{}{
		&models.Asset{},
		&models.MintOrder{},
		&models.AssetLike{},
	}

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

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