package router

import (
	"bookhoard/internal/config"
	"bookhoard/internal/database"
	"bookhoard/internal/handlers"
	"bookhoard/internal/middleware"
	ratelimit "bookhoard/internal/middleware"
	"bookhoard/internal/sync"
	"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/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)
}

// Config holds all dependencies needed for route registration
type Config struct {
	Echo                 *echo.Echo
	Queries              *database.Queries
	Cfg                  *config.Config
	DBPool               interface{} // pgxpool.Pool interface
	AuthHandler          *handlers.AuthHandler
	LibraryHandler       *handlers.LibraryHandler
	DeviceHandler        *handlers.DeviceHandler
	MediaHandler         *handlers.MediaHandler
	SearchHandler        *handlers.SearchHandler
	MatchingHandler      *handlers.MatchingHandler
	KOReaderHandler      *handlers.KOReaderHandler
	WSHandler            *handlers.WSHandler
	ConflictHandler      *handlers.ConflictHandler
	AnalyticsHandler     *handlers.AnalyticsHandler
	QueueHandler         *handlers.QueueHandler
	CollectionHandler    *handlers.CollectionHandler
	OPDSHandler          *handlers.OPDSHandler
	ConnManager          *sync.ConnectionManager
	QueueProcessor       *sync.SyncQueueProcessor
	DeviceAuthMiddleware *middleware.DeviceAuthMiddleware
	LoginTracker         *ratelimit.LoginAttemptTracker
}

// createJWTMiddleware creates a JWT middleware with proper user context setup
func createJWTMiddleware(cfg *Config) echo.MiddlewareFunc {
	return echojwt.WithConfig(echojwt.Config{
		SigningKey: []byte(cfg.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),
			})
		},
	})
}

// RegisterRoutes registers all application routes
func RegisterRoutes(cfg *Config) *handlers.Handler {
	e := cfg.Echo

	// Set up validator
	v := validator.New()
	if err := ratelimit.RegisterPasswordValidation(v); err != nil {
		log.Fatal("Failed to register password validator:", err)
	}
	e.Validator = &CustomValidator{validator: v}

	// Global middleware
	e.Use(echomiddleware.Logger())
	e.Use(echomiddleware.Recover())
	e.Use(echomiddleware.CORS())
	e.Use(ratelimit.RequestTracingMiddleware(cfg.Cfg))

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

	// Register core application routes (collections, devices, media, etc.) - ONCE
	jwtMiddleware := createJWTMiddleware(cfg)
	protected := e.Group("/api", jwtMiddleware)

	// Register route groups
	registerAuthRoutes(cfg, rateLimitMiddleware)
	registerLibraryRoutes(cfg)
	registerDeviceRoutes(cfg)
	registerSyncRoutes(cfg)
	registerCollectionsRoutes(cfg)
	registerMediaRoutes(cfg)
	registerSearchRoutes(cfg)
	registerMatchingRoutes(cfg)
	registerConflictRoutes(cfg)
	registerAnalyticsRoutes(cfg)
	registerQueueRoutes(cfg)
	registerOPDSRoutes(cfg)
	registerWebSocketRoutes(cfg)
	registerFrontendRoutes(cfg)
	registerDocumentationRoutes(cfg)

	// Create scanner handler for scanner routes and progress routes
	scannerHandler := handlers.SetupRoutes(protected, cfg.Queries, cfg.ConnManager)

	// Register progress routes with actual handler
	registerProgressRoutes(cfg, scannerHandler)

	// Register scanner routes (admin only)
	admin := protected.Group("", handlers.AdminMiddleware)
	registerScannerRoutes(admin, scannerHandler)

	return scannerHandler
}