package main

import (
	"bookmann/internal/config"
	"bookmann/internal/database"
	"bookmann/internal/handlers"
	"bookmann/internal/middleware"
	ratelimit "bookmann/internal/middleware"
	"bookmann/internal/sync"
	"bookmann/templates"
	"bytes"
	"context"
	"log"
	"net/http"
	"strings"
	"time"

	"github.com/go-playground/validator/v10"
	"github.com/golang-jwt/jwt/v5"
	"github.com/google/uuid"
	"github.com/jackc/pgx/v5/pgtype"
	"github.com/jackc/pgx/v5/pgxpool"
	"github.com/labstack/echo-jwt/v4"
	"github.com/labstack/echo/v4"
	echomiddleware "github.com/labstack/echo/v4/middleware"
)

// CustomValidator wraps the go-playground validator
type CustomValidator struct {
	validator *validator.Validate
}

func (cv *CustomValidator) Validate(i interface{}) error {
	return cv.validator.Struct(i)
}

func main() {
	cfg := config.LoadConfig()

	dbPool, err := pgxpool.New(context.Background(), cfg.DatabaseURL())
	if err != nil {
		log.Fatal("Failed to connect to database:", err)
	}
	defer dbPool.Close()

	queries := database.New(dbPool)

	// Create login attempt tracker: 5 failed attempts = 15 minute lockout
	loginAttemptTracker := ratelimit.NewLoginAttemptTracker(5, 15*time.Minute, 5*time.Minute)

	authHandler := handlers.NewAuthHandler(queries, cfg.JWTSecret, loginAttemptTracker)
	libraryHandler := handlers.NewLibraryHandler(queries)
	deviceHandler := handlers.NewDeviceHandler(queries, cfg.JWTSecret, cfg)
	deviceAuthMiddleware := middleware.NewDeviceAuthMiddleware(queries)

	// Create WebSocket connection manager
	connManager := sync.NewConnectionManager()
	connManager.StartCleanupTask()

	// Create sync queue processor
	queueProcessor := sync.NewSyncQueueProcessor(queries)
	go queueProcessor.Start(context.Background())

	koreaderHandler := handlers.NewKOReaderHandler(queries, connManager, queueProcessor)
	wsHandler := handlers.NewWSHandler(queries, connManager, cfg.JWTSecret, deviceAuthMiddleware)
	conflictHandler := handlers.NewConflictHandler(queries, connManager)
	queueHandler := handlers.NewQueueHandler(queries, queueProcessor)

	e := echo.New()

	// Set up validator
	v := validator.New()

	// Register custom password complexity validator
	if err := ratelimit.RegisterPasswordValidation(v); err != nil {
		log.Fatal("Failed to register password validator:", err)
	}

	e.Validator = &CustomValidator{validator: v}

	// Middleware
	e.Use(echomiddleware.Logger())
	e.Use(echomiddleware.Recover())
	e.Use(echomiddleware.CORS())
	e.Use(ratelimit.RequestTracingMiddleware(cfg))

	// Rate limiter for auth endpoints
	rateLimiterConfig := ratelimit.RateLimiterConfig{
		Enabled:           cfg.RateLimitEnabled,
		RequestsPerMinute: cfg.RequestsPerMinute,
		CleanupInterval:   5 * time.Minute,
	}
	rateLimiter := ratelimit.NewRateLimiter(rateLimiterConfig)
	rateLimitMiddleware := ratelimit.RateLimiterMiddleware(rateLimiter)

	// Auth routes (no auth required, but rate limited)
	e.POST("/api/auth/register", rateLimitMiddleware(authHandler.Register))
	e.POST("/api/auth/login", rateLimitMiddleware(authHandler.Login))

	// JWT middleware for protected routes
	jwtMiddleware := echojwt.WithConfig(echojwt.Config{
		SigningKey: []byte(cfg.JWTSecret),
		ContextKey: "user",
		SuccessHandler: func(c echo.Context) {
			token := c.Get("user").(*jwt.Token)
			claims := token.Claims.(jwt.MapClaims)
			c.Set("user_id", claims["user_id"])
			c.Set("user_role", claims["user_role"])
			c.Set("user_email", claims["user_email"])
			c.Set("user_username", claims["user_username"])
			// Parse UUID from string claims
			userIDStr, _ := claims["user_id"].(string)
			userUUID, err := uuid.Parse(userIDStr)
			if err != nil {
				c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user ID in token"})
				return
			}

			c.Set("user", database.Users{
				ID:       pgtype.UUID{Bytes: [16]byte(userUUID), Valid: true},
				Email:    claims["user_email"].(string),
				Username: claims["user_username"].(string),
				Role:     claims["user_role"].(string),
			})
		},
	})

	// Protected routes
	protected := e.Group("/api", jwtMiddleware)

	// Setup ebook handler routes first (so we can use it for library scan)
	h := handlers.SetupRoutes(protected, queries, connManager)

	// Public library types endpoint (no authentication required)
	e.GET("/api/libraries/types", libraryHandler.GetLibraryTypes)

	// Refresh token endpoint (no authentication required - uses refresh token from body)
	e.POST("/api/auth/refresh", authHandler.RefreshAccessToken)

	// Logout endpoint (optional authentication - can revoke tokens if provided)
	e.POST("/api/auth/logout", authHandler.Logout)

	// Protected routes
	protected = e.Group("/api", jwtMiddleware)

	// Setup ebook handler routes first (so we can use it for library scan)
	h = handlers.SetupRoutes(protected, queries, connManager)

	protected.GET("/auth/profile", authHandler.GetProfile)
	protected.PUT("/auth/profile", authHandler.UpdateProfile)

	// Admin-only routes for user and folder management
	admin := protected.Group("/auth", handlers.AdminMiddleware)
	admin.GET("/users", authHandler.ListUsers)
	admin.PUT("/users/:id/max-devices", authHandler.UpdateUserMaxDevices)

	// Library management routes
	library := protected.Group("/libraries")

	// Admin-only library routes
	adminLibrary := library.Group("", handlers.AdminMiddleware)
	adminLibrary.POST("", libraryHandler.CreateLibrary)
	adminLibrary.GET("", libraryHandler.ListLibraries)
	adminLibrary.GET("/:id", libraryHandler.GetLibrary)
	adminLibrary.PUT("/:id", libraryHandler.UpdateLibrary)
	adminLibrary.DELETE("/:id", libraryHandler.DeleteLibrary)
	adminLibrary.POST("/:id/folders", libraryHandler.AddLibraryFolder)
	adminLibrary.GET("/:id/folders", libraryHandler.GetLibraryFolders)
	adminLibrary.DELETE("/:id/folders", libraryHandler.DeleteLibraryFolder)
	adminLibrary.GET("/:id/stats", libraryHandler.GetLibraryStats)
	adminLibrary.POST("/:id/scan", func(c echo.Context) error {
		libraryID := c.Param("id")
		scanReq := map[string]interface{}{
			"library_id": libraryID,
		}
		c.Set("scan_request", scanReq)
		return h.ScanEbooks(c)
	})
	adminLibrary.GET("/:id/media-items", func(c echo.Context) error {
		libraryID := c.Param("id")
		c.QueryParams().Set("library_id", libraryID)
		return h.ListMediaItems(c)
	})

	// User library visibility control
	protected.POST("/libraries/visibility", libraryHandler.SetLibraryVisibility)
	protected.GET("/libraries/visible", libraryHandler.GetUserVisibleLibraries)

	protected.DELETE("/auth/account", authHandler.DeleteAccount)
	protected.PUT("/library/scan-settings", authHandler.UpdateScanSettings)
	protected.GET("/library/scan-settings", authHandler.GetScanSettings)

	// Auth update routes
	authGroup := e.Group("/api/auth", jwtMiddleware)
	authGroup.PUT("/email", authHandler.UpdateEmail)
	authGroup.PUT("/username", authHandler.UpdateUsername)
	authGroup.PUT("/password", authHandler.UpdatePassword)
	authGroup.PUT("/theme", authHandler.UpdateTheme)
	// force rebuild

	// Device management routes (public - for registration)
	e.POST("/api/devices/register", deviceHandler.InitiateRegistration)
	e.POST("/api/devices/register/status", deviceHandler.CheckRegistrationStatus)

	// KOReader sync routes (device authentication required)
	koreaderSync := e.Group("/api/sync/koreader")
	koreaderSync.POST("/progress", deviceAuthMiddleware.Authenticate(koreaderHandler.SyncProgress))
	koreaderSync.GET("/metadata/:uuid", deviceAuthMiddleware.Authenticate(koreaderHandler.GetMetadata))
	koreaderSync.GET("/library", deviceAuthMiddleware.Authenticate(koreaderHandler.GetLibrary))
	koreaderSync.POST("/bookmarks", deviceAuthMiddleware.Authenticate(koreaderHandler.SyncBookmarks))

	// Kobo sync routes (device authentication required)
	koboHandler := handlers.NewKoboHandler(queries, connManager)
	koboSync := e.Group("/api/sync/kobo")
	koboSync.POST("/markup", deviceAuthMiddleware.Authenticate(koboHandler.Markup))
	koboSync.POST("/bookmark", deviceAuthMiddleware.Authenticate(koboHandler.Bookmark))
	koboSync.POST("/v1/analytics/gettests", deviceAuthMiddleware.Authenticate(koboHandler.AnalyticsGettests))
	koboSync.GET("/v1/initialization", deviceAuthMiddleware.Authenticate(koboHandler.Initialization))
	koboSync.POST("/sync-from-server", deviceAuthMiddleware.Authenticate(koboHandler.SyncFromServer))

	// Media item routes (download and shelf management)
	mediaHandler := handlers.NewMediaHandler(queries)
	e.GET("/api/books/:uuid/download", mediaHandler.DownloadBook)
	protected.POST("/devices/:id/shelves", mediaHandler.AddToShelf)
	protected.GET("/devices/:id/shelves", mediaHandler.GetShelf)
	protected.DELETE("/devices/:id/shelves", mediaHandler.RemoveFromShelf)
	protected.DELETE("/devices/:id/shelves/clear", mediaHandler.ClearShelf)

	// Device management routes (protected - require user auth)
	devices := protected.Group("/devices")
	devices.GET("", deviceHandler.ListDevices)
	devices.GET("/:id", deviceHandler.GetDevice)
	devices.PUT("/:id", deviceHandler.UpdateDevice)
	devices.DELETE("/:id", deviceHandler.DeleteDevice)
	devices.GET("/pending", deviceHandler.ListPendingRegistrations)
	devices.GET("/approve/:registration_id", deviceHandler.ApproveDevice)
	devices.POST("/reject/:registration_id", deviceHandler.RejectDevice)

	// Conflict resolution routes (protected - require user auth)
	conflicts := protected.Group("/conflicts")
	conflicts.GET("", conflictHandler.ListConflicts)
	conflicts.GET("/:id", conflictHandler.GetConflict)
	conflicts.POST("/:id/resolve", conflictHandler.ResolveConflict)
	conflicts.DELETE("/:id", conflictHandler.DeleteConflict)
	conflicts.POST("/dismiss-all", conflictHandler.DismissAllResolved)

	// Sync queue management routes (protected - require user auth)
	queue := protected.Group("/queue")
	queue.GET("/devices/:device_id/stats", queueHandler.GetDeviceQueueStats)
	queue.GET("/devices/:device_id/items", queueHandler.ListDeviceQueueItems)
	queue.POST("/items/:item_id/retry", queueHandler.RetryQueueItem)
	queue.DELETE("/items/:item_id", queueHandler.DeleteQueueItem)
	queue.DELETE("/devices/:device_id/clear", queueHandler.ClearDeviceQueue)

	// Admin-only queue routes
	adminQueue := queue.Group("", handlers.AdminMiddleware)
	adminQueue.GET("/items", queueHandler.ListAllQueueItems)

	// WebSocket endpoint for real-time sync
	e.GET("/ws/sync", wsHandler.HandleWebSocket)

	// Static files
	e.Static("/static", "web/static")

	// Start scheduler for auto-scanning
	go h.StartScheduler()
	defer h.StopScheduler()

	// Start watch mode for all libraries (background)
	go func() {
		time.Sleep(2 * time.Second) // Wait a bit for server to be ready
		if err := h.StartWatchModeForAllLibraries(context.Background()); err != nil {
			log.Printf("Warning: failed to start watch mode for libraries: %v", err)
		}
	}()

	// Bookshelf route (protected) - new default for logged-in users
	protected.GET("/bookshelf", func(c echo.Context) error {
		userID := c.Get("user_id").(string)
		userEmail := c.Get("user_email").(string)
		userUsername := c.Get("user_username").(string)
		userRole := c.Get("user_role").(string)

		user := templates.User{
			ID:       userID,
			Email:    userEmail,
			Username: userUsername,
			Role:     userRole,
		}

		var buf bytes.Buffer
		err := templates.BookShelf(user).Render(c.Request().Context(), &buf)
		if err != nil {
			return err
		}
		return c.HTML(http.StatusOK, buf.String())
	})

	// Direct /bookshelf route (protected)
	e.GET("/bookshelf", func(c echo.Context) error {
		tokenString := c.Request().Header.Get("Authorization")
		if tokenString != "" && strings.HasPrefix(tokenString, "Bearer ") {
			tokenString = tokenString[7:]
		} else {
			// Check for token in cookie
			cookie, err := c.Cookie("token")
			if err != nil {
				return c.Redirect(http.StatusFound, "/login")
			}
			tokenString = cookie.Value
		}

		token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
			return []byte(cfg.JWTSecret), nil
		})

		if err != nil || !token.Valid {
			return c.Redirect(http.StatusFound, "/login")
		}

		claims := token.Claims.(jwt.MapClaims)
		user := templates.User{
			ID:       claims["user_id"].(string),
			Email:    claims["user_email"].(string),
			Username: claims["user_username"].(string),
			Role:     claims["user_role"].(string),
		}

		var buf bytes.Buffer
		err = templates.BookShelf(user).Render(c.Request().Context(), &buf)
		if err != nil {
			return err
		}
		return c.HTML(http.StatusOK, buf.String())
	})

	// Dashboard route (protected) - keep for backward compatibility
	protected.GET("/dashboard", func(c echo.Context) error {
		userID := c.Get("user_id").(string)
		userEmail := c.Get("user_email").(string)
		userUsername := c.Get("user_username").(string)
		userRole := c.Get("user_role").(string)

		user := templates.User{
			ID:       userID,
			Email:    userEmail,
			Username: userUsername,
			Role:     userRole,
		}

		var buf bytes.Buffer
		err := templates.Dashboard(user).Render(c.Request().Context(), &buf)
		if err != nil {
			return err
		}
		return c.HTML(http.StatusOK, buf.String())
	})

	dummyUser := templates.User{ID: "", Username: "Admin", Email: "admin@example.com"}

	// Routes
	e.GET("/", func(c echo.Context) error {
		loggedIn := false
		var buf bytes.Buffer
		err := templates.Index(loggedIn).Render(c.Request().Context(), &buf)
		if err != nil {
			return err
		}
		return c.HTML(http.StatusOK, buf.String())
	})

	e.GET("/login", func(c echo.Context) error {
		var buf bytes.Buffer
		err := templates.Login().Render(c.Request().Context(), &buf)
		if err != nil {
			return err
		}
		return c.HTML(http.StatusOK, buf.String())
	})

	e.GET("/register", func(c echo.Context) error {
		var buf bytes.Buffer
		err := templates.Register().Render(c.Request().Context(), &buf)
		if err != nil {
			return err
		}
		return c.HTML(http.StatusOK, buf.String())
	})

	e.GET("/admin", func(c echo.Context) error {
		var buf bytes.Buffer
		err := templates.Admin(dummyUser).Render(c.Request().Context(), &buf)
		if err != nil {
			return err
		}
		return c.HTML(http.StatusOK, buf.String())
	})

	e.GET("/admin/", func(c echo.Context) error {
		var buf bytes.Buffer
		err := templates.Admin(dummyUser).Render(c.Request().Context(), &buf)
		if err != nil {
			return err
		}
		return c.HTML(http.StatusOK, buf.String())
	})

	e.GET("/admin/profile", func(c echo.Context) error {
		var buf bytes.Buffer
		err := templates.AdminProfile(dummyUser).Render(c.Request().Context(), &buf)
		if err != nil {
			return err
		}
		return c.HTML(http.StatusOK, buf.String())
	})

	e.GET("/admin/library", func(c echo.Context) error {
		var buf bytes.Buffer
		err := templates.AdminLibrary(dummyUser).Render(c.Request().Context(), &buf)
		if err != nil {
			return err
		}
		return c.HTML(http.StatusOK, buf.String())
	})

	// Start server
	log.Printf("Starting server on port %s", cfg.ServerPort)
	e.Logger.Fatal(e.Start(":" + cfg.ServerPort))
}