package main

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

	_ "dubbo.apache.org/dubbo-go/v3/imports"
	_ "dubbo.apache.org/dubbo-go/v3/protocol/triple"
	"dubbo.apache.org/dubbo-go/v3/protocol"
	"dubbo.apache.org/dubbo-go/v3/server"
	"github.com/joho/godotenv"
	"github.com/redis/go-redis/v9"

	"github.com/topfans/backend/pkg/database"
	"github.com/topfans/backend/pkg/health"
	"github.com/topfans/backend/pkg/logger"
	"github.com/topfans/backend/services/aiChatService/model"
	"github.com/topfans/backend/services/aiChatService/provider"
	"github.com/topfans/backend/services/aiChatService/repository"
	"github.com/topfans/backend/services/aiChatService/service"
	pbAIChat "github.com/topfans/backend/pkg/proto/ai_chat"
	"go.uber.org/zap"
)

var (
	port            = flag.Int("port", getEnvInt("PORT", 20008), "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")
	redisHost       = flag.String("redis-host", getEnv("REDIS_HOST", "127.0.0.1"), "Redis host")
	redisPort       = flag.Int("redis-port", getEnvInt("REDIS_PORT", 6379), "Redis port")
	redisPassword   = flag.String("redis-password", getEnv("REDIS_PASSWORD", ""), "Redis password")
	redisDB         = flag.Int("redis-db", getEnvInt("REDIS_DB", 0), "Redis db")
	contextTTL      = flag.Int("context-ttl", getEnvInt("CONTEXT_TTL", 86400), "Context TTL in seconds")
	triggerTurns    = flag.Int("trigger-turns", getEnvInt("TRIGGER_TURNS", 5), "Turns to trigger memory extraction")
	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() {
	godotenv.Load()
	flag.Parse()

	env := os.Getenv("ENV")
	if env == "" {
		env = "development"
	}

	if err := logger.Init(logger.Config{
		ServiceName: "ai-chat-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 AI Chat 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")

	// 初始化 Redis
	redisClient := redis.NewClient(&redis.Options{
		Addr:     fmt.Sprintf("%s:%d", *redisHost, *redisPort),
		Password: *redisPassword,
		DB:       *redisDB,
	})

	// 测试 Redis 连接
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	if err := redisClient.Ping(ctx).Err(); err != nil {
		logger.Logger.Fatal(fmt.Sprintf("Failed to connect to Redis: %v", err))
	}
	cancel()
	logger.Logger.Info("Redis connected successfully")

	// 启动健康检查 HTTP 服务器
	healthPort := *port + 1000
	healthHandler = health.NewHandler("ai-chat-service", healthPort)
	healthHandler.Start()

	// 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
	personaRepo := repository.NewPostgreSQLPersonaRepository(database.GetDB())
	configRepo := repository.NewPostgreSQLConfigRepository(database.GetDB())
	shortTermMemoryRepo := repository.NewRedisMemoryRepository(redisClient, *contextTTL)
	longTermMemoryRepo := repository.NewPostgreSQLMemoryRepository(database.GetDB())
	logger.Logger.Info("Repository layer initialized")

	// 从数据库加载 LLM 配置
	loadCtx := context.Background()
	llmConfigs, err := configRepo.GetByCategory(loadCtx, "llm")
	if err != nil {
		logger.Logger.Warn("Failed to load LLM configs from database, using env defaults", zap.Error(err))
	}

	// 获取 MiniMax 配置
	miniMaxAPIKey := getEnv("MINIMAX_API_KEY", "")
	miniMaxAPIURL := getEnv("MINIMAX_API_URL", "https://api.minimaxi.com/v1")
	miniMaxModel := getEnv("MINIMAX_MODEL", "M2-her")
	if val, ok := llmConfigs["minimax.api_key"]; ok && val != "" {
		miniMaxAPIKey = val
	}
	if val, ok := llmConfigs["minimax.api_url"]; ok && val != "" {
		miniMaxAPIURL = val
	}
	if val, ok := llmConfigs["minimax.model"]; ok && val != "" {
		miniMaxModel = val
	}

	// 获取 Qwen 配置
	qwenAPIKey := getEnv("QWEN_API_KEY", "")
	qwenAPIURL := getEnv("QWEN_API_URL", "https://dashscope.aliyuncs.com/compatible-mode/v1")
	qwenModel := getEnv("QWEN_MODEL", "qwen-plus")
	if val, ok := llmConfigs["qwen.api_key"]; ok && val != "" {
		qwenAPIKey = val
	}
	if val, ok := llmConfigs["qwen.api_url"]; ok && val != "" {
		qwenAPIURL = val
	}
	if val, ok := llmConfigs["qwen.model"]; ok && val != "" {
		qwenModel = val
	}

	logger.Logger.Info("LLM configs loaded",
		zap.String("minimax_url", miniMaxAPIURL),
		zap.String("minimax_model", miniMaxModel),
		zap.Bool("has_minimax_key", miniMaxAPIKey != ""),
		zap.String("qwen_url", qwenAPIURL),
		zap.String("qwen_model", qwenModel),
		zap.Bool("has_qwen_key", qwenAPIKey != ""),
	)

	// 创建 Service 层实例
	llmService := service.NewLLMService(
		miniMaxAPIURL,
		miniMaxAPIKey,
		miniMaxModel,
		qwenAPIURL,
		qwenAPIKey,
		qwenModel,
	)
	personaService := service.NewPersonaService(personaRepo)
	memoryService := service.NewMemoryService(shortTermMemoryRepo, longTermMemoryRepo)
	auditService := service.NewAuditService()
	chatService := service.NewChatService(
		llmService,
		personaService,
		memoryService,
		auditService,
		*contextTTL,
		*triggerTurns,
	)
	logger.Logger.Info("Service layer initialized")

	// 创建 Provider 层实例
	aiChatProvider := provider.NewAIChatProvider(
		chatService,
		personaService,
		memoryService,
		auditService,
	)
	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))
	}

	// 注册 AI Chat Service
	if err := pbAIChat.RegisterAIChatServiceHandler(srv, aiChatProvider); err != nil {
		logger.Logger.Fatal(fmt.Sprintf("Failed to register AI Chat Service: %v", err))
	}

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

	logger.Logger.Info(fmt.Sprintf("AI Chat 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 AI Chat Service...")

	if healthHandler != nil {
		healthHandler.Stop()
	}

	redisClient.Close()
}

// 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")
	}

	tables := []interface{}{
		&model.Persona{},
		&model.UserMemory{},
		&model.Config{},
	}

	for _, table := range tables {
		if err := db.AutoMigrate(table); err != nil {
			// 如果约束删除失败（表已存在该约束），忽略并继续
			logger.Logger.Warn(fmt.Sprintf("Migration warning for %T: %v", table, err))
		}
	}

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