package main

import (
	"bookmann/internal/config"
	"bookmann/internal/database"
	"bookmann/internal/handlers"
	"bookmann/internal/middleware"
	ratelimit "bookmann/internal/middleware"
	"bookmann/internal/services"
	"bookmann/internal/sync"
	"bookmann/templates"
	"bytes"
	"context"
	"log"
	"net/http"
	"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 getTemplateUserWithTheme(c echo.Context, queries *database.Queries) (templates.User, 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)

	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return templates.User{}, err
	}

	userDB, err := queries.GetUser(c.Request().Context(), pgtype.UUID{Bytes: userUUID, Valid: true})
	if err != nil {
		return templates.User{}, err
	}

	userTheme := "tokyo-night"
	if userDB.Theme.Valid {
		userTheme = userDB.Theme.String
	}

	return templates.User{
		ID:       userID,
		Email:    userEmail,
		Username: userUsername,
		Role:     userRole,
		Theme:    userTheme,
	}, nil
}

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)
	analyticsHandler := handlers.NewAnalyticsHandler(queries)
	queueHandler := handlers.NewQueueHandler(queries, queueProcessor)

	// Create conversion service for EPUB→KEPUB conversion
	conversionService := services.NewConversionService(queries, "/var/bookmann/cache/kepub")
	opdsHandler := handlers.NewOPDSHandler(queries, conversionService)

	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)

	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))

	// Book matching and unlinked book resolution routes
	sync := protected.Group("/sync")
	sync.POST("/bulk-link-books", h.BulkLinkBooks)
	sync.POST("/auto-link-books", h.AutoLinkBooks)
	sync.GET("/unlinked-books/:id/suggestions", h.GetUnlinkedBookSuggestions)

	// 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)

	// Bulk book operations (protected - require user auth)
	books := protected.Group("/books")
	books.POST("/bulk-delete", mediaHandler.HandleBulkDelete)
	books.POST("/bulk-update", mediaHandler.HandleBulkUpdate)

	// 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)
	conflicts.POST("/bulk-resolve", conflictHandler.BulkResolveConflicts)
	conflicts.POST("/bulk-dismiss", conflictHandler.BulkDismissConflicts)

	// Analytics routes (protected - require user auth)
	analytics := protected.Group("/analytics")
	analytics.GET("/reading-stats", analyticsHandler.GetReadingStats)
	analytics.GET("/device-usage", analyticsHandler.GetDeviceUsage)
	analytics.GET("/popular-books", analyticsHandler.GetPopularBooks)

	// 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)

	// OPDS routes (public - device authentication optional)
	opds := e.Group("/opds/devices")
	opds.GET("/:deviceId/catalog", opdsHandler.GetDeviceCatalog)
	opds.GET("/:deviceId/search", opdsHandler.SearchDeviceCatalog)
	opds.GET("/:deviceId/nav", opdsHandler.GetDeviceNavigation)
	opds.GET("/:deviceId/download/:bookId", opdsHandler.DownloadBook)
	opds.GET("/:deviceId/cover/:bookId", opdsHandler.GetCoverImage)
	opds.GET("/:deviceId/formats/:bookId", opdsHandler.ListFormats)

	// 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())
	})

	// Analytics route (protected) - SSR version
	protected.GET("/analytics", func(c echo.Context) error {
		user, err := getTemplateUserWithTheme(c, queries)
		if err != nil {
			return c.HTML(http.StatusInternalServerError, "Error loading user")
		}

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

	// Queue Management route (protected) - SSR version
	// Progress visualization route (protected) - SSR version
	protected.GET("/progress", func(c echo.Context) error {
		user, err := getTemplateUserWithTheme(c, queries)
		if err != nil {
			return c.HTML(http.StatusInternalServerError, "Error loading user")
		}

		progressData, err := h.GetAllProgressData(c)
		if err != nil {
			return c.HTML(http.StatusInternalServerError, "Error loading progress")
		}

		progressItems := make([]templates.ProgressItemData, len(progressData))
		for i, p := range progressData {
			deviceIcon := ""
			deviceType := ""
			switch p.LastSyncDevice {
			case "koreader":
				deviceIcon = "📖"
				deviceType = "KOReader"
			case "kobo":
				deviceIcon = "📚"
				deviceType = "Kobo"
			case "web":
				deviceIcon = "🌐"
				deviceType = "Web"
			case "mobile":
				deviceIcon = "📱"
				deviceType = "Mobile"
			}

			progressItems[i] = templates.ProgressItemData{
				MediaItemID:        uuid.UUID(p.MediaItemID).String(),
				Title:              p.Title,
				Author:             p.Author,
				CoverImagePath:     p.CoverImagePath,
				CurrentPage:        p.CurrentPage,
				TotalPages:         p.TotalPages,
				ProgressPercentage: p.Percentage,
				LastUpdated:        p.LastReadAt.Format("2006-01-02T15:04:05Z07:00"),
				DeviceName:         p.LastSyncDevice,
				DeviceType:         deviceType,
				DeviceIcon:         deviceIcon,
				EpubCFI:            p.Epubcfi,
			}
		}

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

	// Queue Management route (protected) - SSR version
	protected.GET("/queue", 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,
		}

		// Fetch queue items for SSR (uses existing handler method)
		queueItems, err := queueHandler.GetQueueData(c)
		if err != nil {
			return c.HTML(http.StatusInternalServerError, "Error loading queue")
		}

		// Calculate stats from items
		stats := handlers.QueueStatsResponse{
			PendingCount:    0,
			ProcessingCount: 0,
			FailedCount:     0,
			CompletedCount:  0,
			TotalCount:      int64(len(queueItems)),
		}
		for _, item := range queueItems {
			switch item.Status {
			case "pending":
				stats.PendingCount++
			case "processing":
				stats.ProcessingCount++
			case "failed":
				stats.FailedCount++
			case "completed":
				stats.CompletedCount++
			}
		}

		// Render template WITH data (SSR)
		var buf bytes.Buffer
		err = templates.Queue(user, queueItems, stats).Render(c.Request().Context(), &buf)
		if err != nil {
			return err
		}
		return c.HTML(http.StatusOK, buf.String())
	})

	// Collections management route (protected) - SSR version
	collectionHandler := handlers.NewCollectionHandler(queries, connManager)
	collections := protected.Group("/collections")
	collections.POST("/bulk-add-books", collectionHandler.HandleBulkAddBooks)
	collections.GET("", func(c echo.Context) error {
		user, err := getTemplateUserWithTheme(c, queries)
		if err != nil {
			return c.HTML(http.StatusInternalServerError, "Error loading user")
		}

		// Fetch collections for SSR
		collectionData, err := collectionHandler.GetCollectionsData(c)
		if err != nil {
			return c.HTML(http.StatusInternalServerError, "Error loading collections")
		}

		// Convert to template format
		collectionsList := make([]templates.CollectionData, len(collectionData))
		for i, col := range collectionData {
			description := ""
			if col.Description.Valid {
				description = col.Description.String
			}
			color := ""
			if col.Color.Valid {
				color = col.Color.String
			}
			icon := ""
			if col.Icon.Valid {
				icon = col.Icon.String
			}

			collectionsList[i] = templates.CollectionData{
				ID:          uuid.UUID(col.ID.Bytes).String(),
				Name:        col.Name,
				Description: description,
				Color:       color,
				Icon:        icon,
			}
		}

		// Render template WITH data (SSR)
		var buf bytes.Buffer
		err = templates.Collection(user, collectionsList).Render(c.Request().Context(), &buf)
		if err != nil {
			return err
		}
		return c.HTML(http.StatusOK, buf.String())
	})

	collections.GET("/:id", func(c echo.Context) error {
		user, err := getTemplateUserWithTheme(c, queries)
		if err != nil {
			return c.HTML(http.StatusInternalServerError, "Error loading user")
		}

		collectionID, err := uuid.Parse(c.Param("id"))
		if err != nil {
			return c.HTML(http.StatusBadRequest, "Invalid collection ID")
		}

		// Fetch collection for SSR
		collectionDB, err := collectionHandler.GetCollectionData(c, collectionID)
		if err != nil {
			return c.HTML(http.StatusNotFound, "Collection not found")
		}

		// Fetch books for SSR
		booksData, err := collectionHandler.GetCollectionBooksData(c, collectionID)
		if err != nil {
			return c.HTML(http.StatusInternalServerError, "Error loading books")
		}

		// Convert to template format
		description := ""
		if collectionDB.Description.Valid {
			description = collectionDB.Description.String
		}
		color := ""
		if collectionDB.Color.Valid {
			color = collectionDB.Color.String
		}
		icon := ""
		if collectionDB.Icon.Valid {
			icon = collectionDB.Icon.String
		}

		collectionDetail := templates.CollectionDetailData{
			ID:          uuid.UUID(collectionDB.ID.Bytes).String(),
			Name:        collectionDB.Name,
			Description: description,
			Color:       color,
			Icon:        icon,
		}

		books := make([]templates.BookData, len(booksData))
		for i, book := range booksData {
			author := ""
			if book.Author.Valid {
				author = book.Author.String
			}
			coverPath := ""
			if book.CoverImagePath.Valid {
				coverPath = book.CoverImagePath.String
			}
			books[i] = templates.BookData{
				MediaItemID:    uuid.UUID(book.MediaItemID.Bytes).String(),
				Title:          book.Title,
				Author:         author,
				CoverImagePath: coverPath,
			}
		}

		// Render template WITH data (SSR)
		var buf bytes.Buffer
		err = templates.CollectionDetail(user, collectionDetail, books).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))
}