package router

import (
	"context"
	"embed"
	"fmt"
	"io/fs"
	"log"
	"net/http"
	"opencatd-open/internal/api"
	"opencatd-open/internal/channel"
	"opencatd-open/internal/dao"
	"opencatd-open/internal/passkey"
	"opencatd-open/internal/proxy"
	"opencatd-open/internal/usage"
	"opencatd-open/middleware"
	"opencatd-open/pkg/config"
	"os"
	"os/signal"
	"sync"
	"syscall"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/redis/go-redis/v9"
	"gorm.io/gorm"
)

func SetRouter(cfg *config.Config, db *gorm.DB, web *embed.FS) {
	ctx, cancel := context.WithCancel(context.Background())
	var wg sync.WaitGroup

	if cfg == nil || db == nil {
		panic("cfg or db is nil")
	}

	sqlDB, err := db.DB()
	if err != nil {
		log.Fatalf("Failed to get underlying *sql.DB: %v", err)
	}

	// Initialize DAOs
	userDAO := dao.NewUserDAO(db)
	apiKeyDAO := dao.NewApiKeyDAO(db)
	usageDAO := dao.NewUsageDAO(db)
	dailyDAO := dao.NewDailyUsageDAO(db)
	channelDAO := dao.NewChannelDAO(db)
	modelDAO := dao.NewModelDAO(db)

	// Initialize channel service
	channelSvc := channel.NewService(channelDAO, modelDAO)

	// Initialize health checker and start periodic checks
	healthChecker := channel.NewHealthChecker(channelDAO, channelSvc)
	go healthChecker.StartPeriodicCheck(ctx)

	// Initialize usage recorder and start background worker
	usageRecorder := usage.NewRecorder(usageDAO, dailyDAO)
	usageRecorder.Start(ctx)
	defer usageRecorder.Stop()

	// Initialize gateway
	gateway := proxy.NewGateway(ctx, cfg, db, &wg, userDAO, apiKeyDAO, usageDAO, dailyDAO)
	gateway.SetChannelService(channelSvc)
	gateway.SetUsageRecorder(usageRecorder)

	// Initialize passkey service
	var rdb *redis.Client
	if cfg.RedisHost != "" {
		rdb = redis.NewClient(&redis.Options{
			Addr:     fmt.Sprintf("%s:%d", cfg.RedisHost, cfg.RedisPort),
			Password: cfg.RedisPassword,
			DB:       cfg.RedisDB,
		})
	}
	passkeySvc, err := passkey.New(db, passkey.Config{
		RPID:    cfg.RPID,
		Origins: cfg.RPOrigins,
		Name:    cfg.AppName,
		Redis:   rdb,
	})
	if err != nil {
		log.Fatalf("Failed to initialize passkey service: %v", err)
	}

	// Initialize API handler
	apiHandler := api.NewHandler(db, passkeySvc)

	r := gin.Default()
	r.Use(middleware.CORS())

	// Public auth routes
	public := r.Group("/api/auth")
	{
		public.POST("/register", apiHandler.Register)
		public.POST("/login", apiHandler.Login)
		public.POST("/passkey/begin", apiHandler.PasskeyLoginBegin)
		public.POST("/passkey/finish", apiHandler.PasskeyLoginComplete)
	}

	// API routes (authenticated)
	apiGroup := r.Group("/api", middleware.Auth(db))
	{
		// User profile
		apiGroup.GET("/me", apiHandler.Me)
		apiGroup.GET("/profile", apiHandler.Me)
		apiGroup.POST("/profile/update", apiHandler.UpdateProfile)
		apiGroup.POST("/profile/update/password", apiHandler.UpdatePassword)

		// Passkey management
		apiGroup.POST("/webauthn/register/begin", apiHandler.PasskeyRegisterBegin)
		apiGroup.POST("/webauthn/register/complete", apiHandler.PasskeyRegisterComplete)
		apiGroup.GET("/webauthn/passkeys", apiHandler.PasskeyList)
		apiGroup.DELETE("/webauthn/passkeys/:id", apiHandler.PasskeyDelete)

		// User management (admin)
		apiGroup.GET("/users", apiHandler.ListUsers)
		apiGroup.GET("/users/:id", apiHandler.GetUser)
		apiGroup.POST("/users", apiHandler.CreateUser)
		apiGroup.PUT("/users/:id", apiHandler.UpdateUser)
		apiGroup.DELETE("/users/:id", apiHandler.DeleteUser)
		apiGroup.POST("/users/batch/:option", apiHandler.BatchUsers)

		// API Key management
		apiGroup.GET("/keys", apiHandler.ListApiKeys)
		apiGroup.GET("/keys/:id", apiHandler.GetApiKey)
		apiGroup.POST("/keys", apiHandler.CreateApiKey)
		apiGroup.PUT("/keys/:id", apiHandler.UpdateApiKey)
		apiGroup.DELETE("/keys/:id", apiHandler.DeleteApiKey)
		apiGroup.POST("/keys/batch/:option", apiHandler.BatchApiKeys)

		// Channel management (legacy endpoints)
		apiGroup.GET("/channels", apiHandler.ListChannels)
		apiGroup.POST("/channels", apiHandler.CreateChannel)
		apiGroup.PUT("/channels/:id", apiHandler.UpdateChannel)
		apiGroup.DELETE("/channels/:id", apiHandler.DeleteChannel)
		apiGroup.GET("/channels/:id/models", apiHandler.GetChannelModels)
		apiGroup.POST("/channels/:id/models", apiHandler.BindChannelModels)

		// Model management (legacy endpoints)
		apiGroup.GET("/models", apiHandler.ListModels)
		apiGroup.POST("/models", apiHandler.CreateModel)
		apiGroup.PUT("/models/:id", apiHandler.UpdateModel)
		apiGroup.DELETE("/models/:id", apiHandler.DeleteModel)

		// 用户自身用量统计
		apiGroup.GET("/usage/stats", apiHandler.MyUsageStats)
		apiGroup.GET("/usage/monthly", apiHandler.MyUsageMonthly)
		apiGroup.GET("/usage/logs", apiHandler.MyUsageLogs)
	}

	// Admin API (requires admin role)
	adminGroup := r.Group("/api/admin", middleware.Auth(db), middleware.AdminOnly())
	{
		// Admin channel management (enhanced)
		adminGroup.GET("/channels", apiHandler.AdminChannels)
		adminGroup.POST("/channels", apiHandler.AdminCreateChannel)
		adminGroup.PUT("/channels/:id", apiHandler.AdminUpdateChannel)
		adminGroup.DELETE("/channels/:id", apiHandler.AdminDeleteChannel)
		adminGroup.POST("/channels/:id/test", apiHandler.AdminTestChannel)
		adminGroup.GET("/channels/:id/models/remote", apiHandler.AdminChannelRemoteModels)
		adminGroup.GET("/channels/:id/models", apiHandler.AdminChannelModels)
		adminGroup.POST("/channels/:id/models", apiHandler.AdminChannelAddModel)
		adminGroup.PATCH("/channels/:id/models/:bid", apiHandler.AdminChannelUpdateModel)
		adminGroup.DELETE("/channels/:id/models/:bid", apiHandler.AdminChannelDeleteModel)

		// Admin model management (enhanced)
		adminGroup.GET("/models", apiHandler.AdminModels)
		adminGroup.DELETE("/models/unused", apiHandler.AdminDeleteUnusedModels)
		adminGroup.POST("/models", apiHandler.AdminCreateModel)
		adminGroup.PUT("/models/:id", apiHandler.AdminUpdateModel)
		adminGroup.DELETE("/models/:id", apiHandler.AdminDeleteModel)
		adminGroup.POST("/models/:id/bindings", apiHandler.AdminCreateModelBinding)
		adminGroup.DELETE("/models/:id/bindings/:bid", apiHandler.AdminDeleteModelBinding)

		// Admin system config
		adminGroup.GET("/config", apiHandler.AdminGetConfig)
		adminGroup.PUT("/config", apiHandler.AdminUpdateConfig)
		adminGroup.GET("/config/registration", apiHandler.AdminGetRegistration)
		adminGroup.PUT("/config/registration", apiHandler.AdminUpdateRegistration)
		adminGroup.GET("/config/password-login", apiHandler.AdminGetPasswordLogin)
		adminGroup.PUT("/config/password-login", apiHandler.AdminUpdatePasswordLogin)

		// Admin usage
		adminGroup.GET("/usage/logs", apiHandler.AdminUsageLogs)
		adminGroup.GET("/usage/summary", apiHandler.AdminUsageSummary)
	}

	// LLM proxy routes
	v1 := r.Group("/v1")
	v1.Use(middleware.AuthLLM(db))
	{
		v1.POST("/chat/completions", gateway.HandleChat)
		v1.POST("/messages", gateway.HandleMessages)
		v1.POST("/responses", gateway.HandleResponses)
		v1.GET("/models", gateway.HandleModels)
	}

	// SPA fallback
	idxFS, err := fs.Sub(web, "dist")
	if err != nil {
		panic(err)
	}

	assetsFS, err := fs.Sub(web, "dist/assets")
	if err != nil {
		panic(err)
	}
	r.StaticFS("/assets", http.FS(assetsFS))

	r.NoRoute(func(c *gin.Context) {
		if c.Writer.Status() == http.StatusNotFound {
			c.FileFromFS("/", http.FS(idxFS))
		}
	})

	srv := &http.Server{
		Addr:    fmt.Sprintf(":%d", cfg.Port),
		Handler: r,
	}

	go func() {
		fmt.Println("Starting server at port:", cfg.Port)
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("listen: %s\n", err)
		}
	}()

	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit
	fmt.Println("\nShutdown Server ...")
	shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer shutdownCancel()

	if err := srv.Shutdown(shutdownCtx); err != nil {
		log.Fatalln("Server Shutdown:", err)
	}

	cancel()
	sqlDB.Close()

	waitChan := make(chan struct{})
	go func() {
		wg.Wait()
		close(waitChan)
	}()

	select {
	case <-waitChan:
		fmt.Println("All goroutines have finished")
	case <-shutdownCtx.Done():
		fmt.Println("⚠️ Shutdown timeout")
	}

	fmt.Println("Server exited")
}