package main

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

	"dubbo.apache.org/dubbo-go/v3/client"
	_ "dubbo.apache.org/dubbo-go/v3/imports"
	"github.com/gin-gonic/gin"
	"github.com/topfans/backend/gateway/config"
	"github.com/topfans/backend/gateway/router"
	"github.com/topfans/backend/pkg/logger"
	"go.uber.org/zap"

	docs "github.com/topfans/backend/gateway/docs"
)

// @title TopFans API
// @version 1.0
// @description TopFans 后端 API 文档 - 微服务架构 Gateway 层
// @host localhost:8080
// @basePath /api/v1
// @securityDefinitions.apikey BearerAuth
// @in header
// @name Authorization
// @schemes http
func main() {
	// 1. 初始化日志
	if err := logger.Init(logger.Config{
		ServiceName: "gateway",
		Environment: "development",
		LogLevel:    "info",
		LogPath:     "logs",
	}); err != nil {
		fmt.Printf("Failed to initialize logger: %v\n", err)
		os.Exit(1)
	}
	defer logger.Logger.Sync()

	logger.Logger.Info("Starting Top-Fans Gateway...")

	// 2. 加载配置
	cfg := config.Load()
	if err := cfg.Validate(); err != nil {
		logger.Logger.Fatal("Invalid configuration", zap.Error(err))
	}

	// 覆盖 Swagger 的 BasePath，避免出现 /api/v1/api/v1 前綴重複
	// Swagger 內的 paths 已經包含 /api/v1/...，這裡設為空即可
	docs.SwaggerInfo.BasePath = ""

	logger.Logger.Info("Configuration loaded",
		zap.String("port", cfg.Server.Port),
		zap.String("mode", cfg.Server.Mode),
		zap.String("user_service_url", cfg.Dubbo.UserServiceURL),
		zap.String("social_service_url", cfg.Dubbo.SocialServiceURL),
		zap.String("asset_service_url", cfg.Dubbo.AssetServiceURL),
		zap.String("gallery_service_url", cfg.Dubbo.GalleryServiceURL),
		zap.String("activity_service_url", cfg.Dubbo.ActivityServiceURL),
	)

	// 3. 设置 Gin 模式
	gin.SetMode(cfg.Server.Mode)

	// 4. 初始化 Dubbo Clients
	logger.Logger.Info("Connecting to Dubbo services...")

	// 4.1 UserService Client
	userClient, err := client.NewClient(
		client.WithClientURL(cfg.Dubbo.UserServiceURL),
	)
	if err != nil {
		logger.Logger.Fatal("Failed to create User Service Dubbo client", zap.Error(err))
	}
	logger.Logger.Info("User Service Dubbo client connected successfully")

	// 4.2 SocialService Client
	socialClient, err := client.NewClient(
		client.WithClientURL(cfg.Dubbo.SocialServiceURL),
	)
	if err != nil {
		logger.Logger.Fatal("Failed to create Social Service Dubbo client", zap.Error(err))
	}
	logger.Logger.Info("Social Service Dubbo client connected successfully")

	// 4.3 AssetService Client
	assetClient, err := client.NewClient(
		client.WithClientURL(cfg.Dubbo.AssetServiceURL),
	)
	if err != nil {
		logger.Logger.Fatal("Failed to create Asset Service Dubbo client", zap.Error(err))
	}
	logger.Logger.Info("Asset Service Dubbo client connected successfully")

	// 4.4 GalleryService Client
	galleryClient, err := client.NewClient(
		client.WithClientURL(cfg.Dubbo.GalleryServiceURL),
	)
	if err != nil {
		logger.Logger.Fatal("Failed to create Gallery Service Dubbo client", zap.Error(err))
	}
	logger.Logger.Info("Gallery Service Dubbo client connected successfully")

	// 4.5 ActivityService Client
	activityClient, err := client.NewClient(
		client.WithClientURL(cfg.Dubbo.ActivityServiceURL),
	)
	if err != nil {
		logger.Logger.Fatal("Failed to create Activity Service Dubbo client", zap.Error(err))
	}
	logger.Logger.Info("Activity Service Dubbo client connected successfully")

	// 5. 设置路由
	logger.Logger.Info("Setting up routes...")
	r, err := router.SetupRouter(userClient, socialClient, assetClient, galleryClient, activityClient)
	if err != nil {
		logger.Logger.Fatal("Failed to setup router", zap.Error(err))
	}
	logger.Logger.Info("Routes configured successfully")

	// 6. 启动服务器
	addr := ":" + cfg.Server.Port
	logger.Logger.Info("Starting HTTP server", zap.String("address", addr))

	// 优雅关闭
	go func() {
		if err := r.Run(addr); err != nil {
			logger.Logger.Fatal("Failed to start server", zap.Error(err))
		}
	}()

	logger.Logger.Info("Gateway server started successfully",
		zap.String("address", fmt.Sprintf("http://localhost%s", addr)),
	)

	// 7. 等待中断信号
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit

	logger.Logger.Info("Shutting down gateway server...")
	logger.Logger.Info("Gateway server stopped")
}