package api

import (
	"context"
	"net/http"
	"os"

	"github.com/gin-gonic/gin"
	"github.com/redis/go-redis/v9"
	"go.uber.org/zap"

	trackcore "veza-backend-api/internal/core/track"
	"veza-backend-api/internal/config"
	"veza-backend-api/internal/handlers"
	"veza-backend-api/internal/middleware"
	"veza-backend-api/internal/models"
	"veza-backend-api/internal/repositories"
	"veza-backend-api/internal/services"
)

// setupValidateRoutes configures the validation endpoint (A01: rate limited)
func (r *APIRouter) setupValidateRoutes(router *gin.RouterGroup) {
	validateHandler := handlers.NewValidateHandler(r.logger)
	validateGroup := router.Group("/")
	if r.config != nil && r.config.EndpointLimiter != nil {
		validateGroup.Use(r.config.EndpointLimiter.ValidateRateLimit())
	}
	validateGroup.POST("validate", validateHandler.Validate)
}

// setupInternalRoutes configure les routes internal (legacy and modern)
func (r *APIRouter) setupInternalRoutes(router *gin.Engine) {
	uploadDir := r.config.UploadDir
	if uploadDir == "" {
		uploadDir = "uploads/tracks"
	}
	chunksDir := uploadDir + "/chunks"

	trackService := trackcore.NewTrackServiceWithDB(r.db, r.logger, uploadDir)
	if r.config.CacheService != nil {
		trackService.SetCacheService(r.config.CacheService)
	}
	trackUploadService := services.NewTrackUploadService(r.db.GormDB, r.logger)
	var redisClient *redis.Client
	if r.config != nil {
		redisClient = r.config.RedisClient
	}
	chunkService := services.NewTrackChunkService(chunksDir, redisClient, r.logger)
	likeService := services.NewTrackLikeService(r.db.GormDB, r.logger)
	streamService := services.NewStreamServiceWithAPIKey(r.config.StreamServerURL, r.config.StreamServerInternalAPIKey, r.logger)

	trackHandler := trackcore.NewTrackHandler(
		trackService,
		trackUploadService,
		chunkService,
		likeService,
		streamService,
	)

	streamEventsHandler := handlers.NewStreamEventsHandler(r.logger)
	liveStreamRepo := repositories.NewLiveStreamRepository(r.db.GormDB)
	liveStreamService := services.NewLiveStreamService(liveStreamRepo)
	streamEventsHandler.SetLiveStreamService(liveStreamService)

	expectedKey := ""
	if r.config != nil {
		expectedKey = r.config.StreamServerInternalAPIKey
	}
	streamCallbackAuth := middleware.StreamCallbackAuth(expectedKey, r.logger)

	internalDeprecated := router.Group("/internal")
	internalDeprecated.Use(middleware.DeprecationWarning(r.logger))
	internalDeprecated.Use(streamCallbackAuth)
	{
		internalDeprecated.POST("/tracks/:id/stream-ready", trackHandler.HandleStreamCallback)
		internalDeprecated.POST("/stream-events", streamEventsHandler.HandleStreamEvent)
	}

	v1Internal := router.Group("/api/v1/internal")
	v1Internal.Use(streamCallbackAuth)
	{
		v1Internal.POST("/tracks/:id/stream-ready", trackHandler.HandleStreamCallback)
		v1Internal.POST("/stream-events", streamEventsHandler.HandleStreamEvent)
	}
}

// setupCorePublicRoutes configure les routes publiques core (health, metrics, upload info)
func (r *APIRouter) setupCorePublicRoutes(router *gin.Engine) {
	var healthCheckHandler gin.HandlerFunc
	var livenessHandler gin.HandlerFunc
	var readinessHandler gin.HandlerFunc

	if r.db != nil && r.db.GormDB != nil {
		var redisClient interface{}
		if r.config != nil {
			redisClient = r.config.RedisClient
		}
		var rabbitMQEventBus interface{}
		if r.config != nil {
			rabbitMQEventBus = r.config.RabbitMQEventBus
		}
		var env string
		if r.config != nil {
			env = r.config.Env
		}
		var s3Service interface{}
		var jobWorker interface{}
		var emailSender interface{}
		if r.config != nil {
			s3Service = r.config.S3StorageService
			jobWorker = r.config.JobWorker
			emailSender = r.config.EmailSender
		}
		healthHandler := handlers.NewHealthHandlerWithServices(
			r.db.GormDB,
			r.logger,
			redisClient,
			rabbitMQEventBus,
			env,
			s3Service,
			jobWorker,
			emailSender,
		)
		healthCheckHandler = healthHandler.Check
		livenessHandler = healthHandler.Liveness
		readinessHandler = healthHandler.Readiness
	} else {
		healthCheckHandler = handlers.SimpleHealthCheck
		livenessHandler = handlers.SimpleHealthCheck
		readinessHandler = handlers.SimpleHealthCheck
	}

	deprecationMW := middleware.DeprecationWarning(r.logger)
	healthMonitoringMW := middleware.HealthCheckMonitoring(r.logger, r.monitoringService)

	router.GET("/health", deprecationMW, healthMonitoringMW, healthCheckHandler)
	router.GET("/healthz", deprecationMW, healthMonitoringMW, livenessHandler)
	router.GET("/readyz", deprecationMW, healthMonitoringMW, readinessHandler)
	router.GET("/metrics", deprecationMW, handlers.PrometheusMetrics())
	if r.config != nil && r.config.ErrorMetrics != nil {
		router.GET("/metrics/aggregated", deprecationMW, handlers.AggregatedMetrics(r.config.ErrorMetrics))
	}
	router.GET("/system/metrics", deprecationMW, handlers.SystemMetrics)

	v1Public := router.Group("/api/v1")
	{
		v1Public.GET("/health", healthCheckHandler)
		v1Public.GET("/healthz", livenessHandler)
		v1Public.GET("/readyz", readinessHandler)

		if r.db != nil && r.db.GormDB != nil {
			var redisClient interface{}
			if r.config != nil {
				redisClient = r.config.RedisClient
			}
			chatServerURL := ""
			streamServerURL := ""
			if r.config != nil {
				chatServerURL = r.config.ChatServerURL
				streamServerURL = r.config.StreamServerURL
			}
			getEnv := func(key, defaultValue string) string {
				if value := os.Getenv(key); value != "" {
					return value
				}
				return defaultValue
			}
			version := getEnv("APP_VERSION", "v1.0.0")
			gitCommit := getEnv("GIT_COMMIT", "unknown")
			buildTime := getEnv("BUILD_TIME", "")
			environment := ""
			if r.config != nil {
				environment = r.config.Env
			}
			statusHandler := handlers.NewStatusHandler(
				r.db.GormDB,
				r.logger,
				redisClient,
				chatServerURL,
				streamServerURL,
				version,
				gitCommit,
				buildTime,
				environment,
			)
			v1Public.GET("/status", statusHandler.GetStatus)
		}

		v1Public.GET("/metrics", handlers.PrometheusMetrics())
		if r.config != nil && r.config.ErrorMetrics != nil {
			v1Public.GET("/metrics/aggregated", handlers.AggregatedMetrics(r.config.ErrorMetrics))
		}
		v1Public.GET("/system/metrics", handlers.SystemMetrics)

		if r.db != nil && r.db.GormDB != nil && r.config != nil {
			uploadConfig := getUploadConfigWithEnv()
			uploadValidator, err := services.NewUploadValidator(uploadConfig, r.logger)
			if err != nil {
				r.logger.Warn("Upload validator created with ClamAV unavailable - uploads will be rejected", zap.Error(err))
				uploadConfig.ClamAVEnabled = false
				uploadValidator, _ = services.NewUploadValidator(uploadConfig, r.logger)
			}
			auditService := services.NewAuditService(r.db, r.logger)
			trackUploadService := services.NewTrackUploadService(r.db.GormDB, r.logger)
			uploadHandler := handlers.NewUploadHandler(uploadValidator, auditService, trackUploadService, r.logger, r.config.MaxConcurrentUploads)
			v1Public.GET("/upload/limits", uploadHandler.GetUploadLimits())
			v1Public.GET("/upload/validate-type", uploadHandler.ValidateFileType())
		}

		if r.config != nil {
			frontendLogHandler, err := handlers.NewFrontendLogHandler(r.config, r.logger)
			if err != nil {
				r.logger.Warn("Failed to create frontend log handler, frontend logs will not be stored", zap.Error(err))
			} else {
				logsRateLimit := middleware.FrontendLogRateLimit(r.config.RedisClient)
				v1Public.POST("/logs/frontend", logsRateLimit, frontendLogHandler.ReceiveLog)
				r.logger.Info("Frontend logging endpoint enabled", zap.String("endpoint", "/api/v1/logs/frontend"))
			}
		}
	}
}

// setupCoreProtectedRoutes configure les routes protégées core (sessions, uploads, audit, admin, conversations)
func (r *APIRouter) setupCoreProtectedRoutes(v1 *gin.RouterGroup) {
	if r.db == nil || r.db.GormDB == nil || r.config == nil {
		return
	}

	csrfMiddleware := middleware.NewCSRFMiddleware(r.config.RedisClient, r.logger)
	csrfMiddleware.SetEnvironment(r.config.Env)
	csrfHandler := handlers.NewCSRFHandler(csrfMiddleware, r.logger)
	if r.config.AuthMiddleware != nil {
		v1.GET("/csrf-token", r.config.AuthMiddleware.OptionalAuth(), csrfHandler.GetCSRFToken())
	} else {
		v1.GET("/csrf-token", csrfHandler.GetCSRFToken())
	}

	protected := v1.Group("/")
	if r.config.AuthMiddleware != nil {
		protected.Use(r.config.AuthMiddleware.RequireAuth())
	}

	sessionService := services.NewSessionService(r.db, r.logger)

	if r.config.RedisClient != nil {
		protected.Use(csrfMiddleware.Middleware())
		r.logger.Info("CSRF protection enabled for core protected routes",
			zap.String("environment", r.config.Env),
		)
	} else {
		r.logger.Warn("Redis not available - CSRF protection disabled (non-production environment)",
			zap.String("environment", r.config.Env),
		)
	}

	uploadConfig := getUploadConfigWithEnv()
	uploadValidator, err := services.NewUploadValidator(uploadConfig, r.logger)
	if err != nil {
		r.logger.Warn("Upload validator created with ClamAV unavailable - uploads will be rejected", zap.Error(err))
		uploadConfig.ClamAVEnabled = false
		uploadValidator, _ = services.NewUploadValidator(uploadConfig, r.logger)
	}
	auditService := services.NewAuditService(r.db, r.logger)
	trackUploadService := services.NewTrackUploadService(r.db.GormDB, r.logger)

	sessionHandler := handlers.NewSessionHandler(sessionService, auditService, r.logger)
	uploadHandler := handlers.NewUploadHandler(uploadValidator, auditService, trackUploadService, r.logger, r.config.MaxConcurrentUploads)
	auditHandler := handlers.NewAuditHandler(auditService, r.logger)

	sessions := protected.Group("/sessions")
	{
		sessions.POST("/logout", sessionHandler.Logout())
		sessions.POST("/logout-all", sessionHandler.LogoutAll())
		sessions.POST("/logout-others", sessionHandler.LogoutOthers())
		sessions.GET("", sessionHandler.GetSessions())
		sessions.GET("/", sessionHandler.GetSessions())
		sessions.DELETE("/:session_id", sessionHandler.RevokeSession())
		sessions.GET("/stats", sessionHandler.GetSessionStats())
		sessions.POST("/refresh", sessionHandler.RefreshSession())
	}

	uploads := protected.Group("/uploads")
	{
		if r.config.RedisClient != nil {
			uploads.Use(middleware.UploadRateLimit(r.config.RedisClient))
		}
		uploads.POST("/", uploadHandler.UploadFile())
		uploads.POST("/batch", uploadHandler.BatchUpload())
		uploads.GET("/:id/status", uploadHandler.GetUploadStatus())
		uploads.GET("/:id/progress", uploadHandler.UploadProgress())
		uploads.DELETE("/:id", uploadHandler.DeleteUpload())
		uploads.GET("/stats", uploadHandler.GetUploadStats())
	}

	audit := protected.Group("/audit")
	{
		audit.GET("/logs", auditHandler.SearchLogs())
		audit.GET("/stats", auditHandler.GetStats())
		audit.GET("/activity", auditHandler.GetUserActivity())
		audit.GET("/suspicious", auditHandler.DetectSuspiciousActivity())
		audit.GET("/ip/:ip", auditHandler.GetIPActivity())
		audit.GET("/logs/:id", auditHandler.GetAuditLog())
		audit.POST("/cleanup", auditHandler.CleanupOldLogs())
	}

	uploadDir := r.config.UploadDir
	if uploadDir == "" {
		uploadDir = "uploads/tracks"
	}
	trackServiceForDashboard := trackcore.NewTrackServiceWithDB(r.db, r.logger, uploadDir)
	if r.config.CacheService != nil {
		trackServiceForDashboard.SetCacheService(r.config.CacheService)
	}

	trackListFunc := func(ctx context.Context, params handlers.TrackListParamsForDashboard) ([]*models.Track, int64, error) {
		return trackServiceForDashboard.ListTracks(ctx, trackcore.TrackListParams{
			Page:      params.Page,
			Limit:     params.Limit,
			UserID:    params.UserID,
			Genre:     params.Genre,
			Format:    params.Format,
			SortBy:    params.SortBy,
			SortOrder: params.SortOrder,
		})
	}

	dashboardHandler := handlers.NewDashboardHandler(auditService, trackListFunc, r.logger)
	protected.GET("/dashboard", dashboardHandler.GetDashboard())

	roomRepo := repositories.NewRoomRepository(r.db.GormDB)
	messageRepo := repositories.NewChatMessageRepository(r.db.GormDB)
	roomService := services.NewRoomService(roomRepo, messageRepo, r.logger)
	roomHandler := handlers.NewRoomHandler(roomService, r.logger)

	conversations := protected.Group("/conversations")
	{
		conversations.GET("", roomHandler.GetUserRooms)
		conversations.POST("", roomHandler.CreateRoom)
		conversations.GET("/:id", roomHandler.GetRoom)
		conversations.PUT("/:id", roomHandler.UpdateRoom)
		conversations.DELETE("/:id", roomHandler.DeleteRoom)
		conversations.POST("/:id/members", roomHandler.AddMember)
		conversations.POST("/:id/participants", roomHandler.AddParticipant)
		conversations.DELETE("/:id/participants/:userId", roomHandler.RemoveParticipant)
		conversations.GET("/:id/history", roomHandler.GetRoomHistory)
	}

	r.notificationService = services.NewNotificationService(r.db, r.logger)
	vapidPublic := os.Getenv("VAPID_PUBLIC_KEY")
	vapidPrivate := os.Getenv("VAPID_PRIVATE_KEY")
	r.pushService = services.NewPushService(r.db.GormDB, r.logger, vapidPublic, vapidPrivate)
	r.notificationService.SetPushService(r.pushService)
	handlers.NewNotificationHandlers(r.notificationService, r.pushService)
	notifications := protected.Group("/notifications")
	{
		notifications.GET("", handlers.NotificationHandlersInstance.GetNotifications)
		notifications.GET("/unread-count", handlers.NotificationHandlersInstance.GetUnreadCount)
		notifications.GET("/preferences", handlers.NotificationHandlersInstance.GetPreferences)
		notifications.PUT("/preferences", handlers.NotificationHandlersInstance.UpdatePreferences)
		notifications.POST("/push/subscribe", handlers.NotificationHandlersInstance.SubscribePush)
		notifications.POST("/:id/read", handlers.NotificationHandlersInstance.MarkAsRead)
		notifications.POST("/read-all", handlers.NotificationHandlersInstance.MarkAllAsRead)
		notifications.DELETE("/:id", handlers.NotificationHandlersInstance.DeleteNotification)
		notifications.DELETE("", handlers.NotificationHandlersInstance.DeleteAllNotifications)
	}

	admin := v1.Group("/admin")
	{
		if r.config.AuthMiddleware != nil {
			admin.Use(r.config.AuthMiddleware.RequireAuth())
			admin.Use(r.config.AuthMiddleware.RequireAdmin())
		}

		admin.GET("/audit/logs", auditHandler.SearchLogs())
		admin.GET("/audit/stats", auditHandler.GetStats())
		admin.GET("/audit/suspicious", auditHandler.DetectSuspiciousActivity())

		// P1.5: pprof endpoints disabled in production to avoid leaking sensitive runtime info
		if r.config != nil && r.config.Env != config.EnvProduction && r.config.Env != "prod" {
			admin.Any("/debug/pprof/*path", gin.WrapH(http.DefaultServeMux))
			r.logger.Info("pprof endpoints enabled at /api/v1/admin/debug/pprof/")
		}

		if r.authService != nil {
			admin.POST("/auth/unlock-account", handlers.UnlockAccount(r.authService, r.logger))
		}
	}
}