package main

import (
	"bookhoard/internal/config"
	"bookhoard/internal/database"
	"bookhoard/internal/handlers"
	"bookhoard/internal/middleware"
	ratelimit "bookhoard/internal/middleware"
	"bookhoard/internal/router"
	"bookhoard/internal/services"
	"bookhoard/internal/sync"
	"bookhoard/templates"
	"context"
	"log"
	"time"

	"github.com/go-playground/validator/v10"
	"github.com/google/uuid"
	"github.com/jackc/pgx/v5/pgtype"
	"github.com/jackc/pgx/v5/pgxpool"
	"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/bookhoard/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) // Now in router/auth.go

	// ========================================================================
	// ROUTER REGISTRATION - Migrate routes to internal/router/ package
	// ========================================================================
	routerConfig := &router.Config{
		Echo:                 e,
		Queries:              queries,
		Cfg:                  cfg,
		DBPool:               dbPool,
		AuthHandler:          authHandler,
		LibraryHandler:       libraryHandler,
		DeviceHandler:        deviceHandler,
		KOReaderHandler:      koreaderHandler,
		WSHandler:            wsHandler,
		ConflictHandler:      conflictHandler,
		AnalyticsHandler:     analyticsHandler,
		QueueHandler:         queueHandler,
		CollectionHandler:    nil, // TODO: Initialize collection handler
		OPDSHandler:          opdsHandler,
		ConnManager:          connManager,
		QueueProcessor:       queueProcessor,
		DeviceAuthMiddleware: deviceAuthMiddleware,
		LoginTracker:         loginAttemptTracker,
	}
	router.RegisterRoutes(routerConfig)

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

	// ========================================================================
	// FRONTEND ROUTES, HEALTH CHECK, DOCS (all now in router package)
	// ========================================================================

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