package server

import (
	"fmt"
	"log"

	"attune-heart-therapy/internal/config"
	"attune-heart-therapy/internal/database"
	"attune-heart-therapy/internal/handlers"
	"attune-heart-therapy/internal/middleware"
	"attune-heart-therapy/internal/services"

	"github.com/gin-gonic/gin"
)

// MiddlewareContainer holds all middleware functions
type MiddlewareContainer struct {
	jwtService services.JWTService
}

// Auth returns the authentication middleware
func (m *MiddlewareContainer) Auth() gin.HandlerFunc {
	return middleware.AuthMiddleware(m.jwtService)
}

// RequireAdmin returns the admin authentication middleware
func (m *MiddlewareContainer) RequireAdmin() gin.HandlerFunc {
	return middleware.RequireAdmin(m.jwtService)
}

// StrictRateLimit returns the strict rate limiting middleware
func (m *MiddlewareContainer) StrictRateLimit() gin.HandlerFunc {
	return middleware.StrictRateLimitMiddleware()
}

type Server struct {
	config         *config.Config
	db             *database.DB
	router         *gin.Engine
	middleware     *MiddlewareContainer
	authHandler    *handlers.AuthHandler
	paymentHandler *handlers.PaymentHandler
	bookingHandler *handlers.BookingHandler
	adminHandler   *handlers.AdminHandler
}

func New(cfg *config.Config) *Server {
	// Set Gin mode based on environment
	gin.SetMode(gin.ReleaseMode)

	router := gin.New()

	// Configure middleware stack
	setupMiddlewareStack(router)

	return &Server{
		config: cfg,
		router: router,
	}
}

// setupMiddlewareStack configures the Gin middleware stack
func setupMiddlewareStack(router *gin.Engine) {
	// Security middleware - should be first
	router.Use(middleware.SecurityMiddleware())

	// CORS middleware for frontend integration
	router.Use(middleware.CORSMiddleware())

	// Request logging middleware
	router.Use(middleware.StructuredLoggingMiddleware())

	// Recovery middleware to handle panics
	router.Use(gin.Recovery())

	// Rate limiting middleware for API protection
	router.Use(middleware.RateLimitMiddleware())
}

// Initialize sets up the database connection and runs migrations
func (s *Server) Initialize() error {
	// Initialize database connection
	db, err := database.New(s.config)
	if err != nil {
		return fmt.Errorf("failed to initialize database: %w", err)
	}
	s.db = db

	// Run database migrations
	if err := s.db.Migrate(); err != nil {
		return fmt.Errorf("failed to run database migrations: %w", err)
	}

	// Seed database with initial data
	if err := s.db.Seed(); err != nil {
		return fmt.Errorf("failed to seed database: %w", err)
	}

	// Initialize services and handlers
	s.initializeServices()

	log.Println("Server initialization completed successfully")
	return nil
}

func (s *Server) Start() error {
	// Initialize database and run migrations
	if err := s.Initialize(); err != nil {
		return err
	}

	// Setup routes
	s.setupRoutes()

	// Start server
	addr := fmt.Sprintf("%s:%s", s.config.Server.Host, s.config.Server.Port)
	log.Printf("Starting server on %s", addr)

	return s.router.Run(addr)
}

// Shutdown gracefully shuts down the server
func (s *Server) Shutdown() error {
	if s.db != nil {
		log.Println("Closing database connection...")
		return s.db.Close()
	}
	return nil
}

func (s *Server) setupRoutes() {
	// Health check endpoint - no middleware needed
	s.router.GET("/health", s.healthCheck)

	// API v1 routes group with base middleware
	v1 := s.router.Group("/api")
	{
		// Public routes group - no authentication required
		public := v1.Group("/")
		{
			// Auth routes - public endpoints for registration and login
			auth := public.Group("/auth")
			{
				// Apply strict rate limiting to auth endpoints
				auth.Use(s.middleware.StrictRateLimit())
				auth.POST("/register", s.authHandler.Register)
				auth.POST("/login", s.authHandler.Login)
			}

			// Schedule routes - public endpoint for getting available slots
			public.GET("/schedules", s.bookingHandler.GetAvailableSlots)

			// Payment webhook - public endpoint for Stripe webhooks (no auth needed)
			public.POST("/payments/webhook", s.paymentHandler.HandleWebhook)
		}

		// Authenticated routes group - require JWT authentication
		authenticated := v1.Group("/")
		authenticated.Use(s.middleware.Auth())
		{
			// Auth profile routes - require authentication
			authProfile := authenticated.Group("/auth")
			{
				authProfile.GET("/profile", s.authHandler.GetProfile)
				authProfile.PUT("/profile", s.authHandler.UpdateProfile)
				authProfile.POST("/logout", s.authHandler.Logout)
			}

			// Booking routes - require authentication
			bookings := authenticated.Group("/bookings")
			{
				bookings.GET("/", s.bookingHandler.GetUserBookings)
				bookings.POST("/", s.bookingHandler.CreateBooking)
				bookings.PUT("/:id/cancel", s.bookingHandler.CancelBooking)
				bookings.PUT("/:id/reschedule", s.bookingHandler.RescheduleBooking)
			}

			// Payment routes - require authentication (except webhook)
			payments := authenticated.Group("/payments")
			{
				payments.POST("/intent", s.paymentHandler.CreatePaymentIntent)
				payments.POST("/confirm", s.paymentHandler.ConfirmPayment)
			}
		}

		// Admin routes - require admin authentication
		admin := v1.Group("/admin")
		admin.Use(s.middleware.RequireAdmin())
		{
			admin.GET("/dashboard", s.adminHandler.GetDashboard)
			admin.POST("/schedules", s.adminHandler.CreateSchedule)
			admin.PUT("/schedules/:id", s.adminHandler.UpdateSchedule)
			admin.GET("/users", s.adminHandler.GetUsers)
			admin.GET("/bookings", s.adminHandler.GetBookings)
			admin.GET("/reports/financial", s.adminHandler.GetFinancialReports)
		}
	}
}

// initializeServices sets up all services and handlers
func (s *Server) initializeServices() {
	// Initialize repositories
	repos := s.db.GetRepositories()

	// Initialize Jitsi service
	jitsiService := services.NewJitsiService(&s.config.Jitsi)

	// Initialize notification service
	notificationService := services.NewNotificationService(repos.Notification, s.config)

	// Initialize JWT service (needed for user service and middleware)
	jwtService := services.NewJWTService(s.config.JWT.Secret, s.config.JWT.Expiration)

	// Initialize middleware container with JWT service
	s.middleware = &MiddlewareContainer{
		jwtService: jwtService,
	}

	// Initialize user service with notification integration
	userService := services.NewUserService(repos.User, jwtService, notificationService)

	// Initialize payment service with notification integration
	paymentService := services.NewPaymentService(s.config, repos.Booking, repos.User, notificationService)

	// Initialize booking service with notification integration
	bookingService := services.NewBookingService(
		repos.Booking,
		repos.Schedule,
		repos.User,
		jitsiService,
		paymentService,
		notificationService,
	)

	// Initialize admin service
	adminService := services.NewAdminService(repos.User, repos.Booking, repos.Schedule)

	// Initialize handlers
	s.authHandler = handlers.NewAuthHandler(userService)
	s.paymentHandler = handlers.NewPaymentHandler(paymentService)
	s.bookingHandler = handlers.NewBookingHandler(bookingService)
	s.adminHandler = handlers.NewAdminHandler(adminService)
}

// healthCheck handles the health check endpoint
func (s *Server) healthCheck(c *gin.Context) {
	response := gin.H{
		"status":  "ok",
		"message": "Video Conference Booking System API",
	}

	// Check database connectivity
	if s.db != nil {
		if err := s.db.Health(); err != nil {
			response["status"] = "error"
			response["database"] = "disconnected"
			response["error"] = err.Error()
			c.JSON(500, response)
			return
		}
		response["database"] = "connected"
	} else {
		response["database"] = "not initialized"
	}

	c.JSON(200, response)
}