package server

import (
	"omega-server/local/api"
	"omega-server/local/middleware/security"
	"omega-server/local/utl/logging"
	"os"
	"time"

	"github.com/gofiber/fiber/v2"
	"github.com/gofiber/fiber/v2/middleware/cors"
	"github.com/gofiber/fiber/v2/middleware/helmet"
	"github.com/gofiber/fiber/v2/middleware/recover"
	"github.com/gofiber/swagger"
	"go.uber.org/dig"
)

func Start(di *dig.Container) *fiber.App {
	app := fiber.New(fiber.Config{
		AppName:           "Omega Project Management",
		ServerHeader:      "omega-server",
		EnablePrintRoutes: true,
		ReadTimeout:       30 * time.Second,
		WriteTimeout:      30 * time.Second,
		IdleTimeout:       120 * time.Second,
		BodyLimit:         10 * 1024 * 1024, // 10MB
		Prefork:           false,
		CaseSensitive:     false,
		StrictRouting:     false,
		DisableKeepalive:  false,
		ErrorHandler: func(c *fiber.Ctx, err error) error {
			// Custom error handler
			code := fiber.StatusInternalServerError
			if e, ok := err.(*fiber.Error); ok {
				code = e.Code
			}

			// Log error
			logging.Error("HTTP Error: %v, Path: %s, Method: %s, IP: %s",
				err, c.Path(), c.Method(), c.IP())

			// Return JSON error response
			return c.Status(code).JSON(fiber.Map{
				"error": err.Error(),
				"code":  code,
			})
		},
	})

	// Initialize security middleware
	securityMW := security.NewSecurityMiddleware()

	// Add recovery middleware first
	app.Use(recover.New(recover.Config{
		EnableStackTrace: true,
	}))

	// Add security middleware stack
	app.Use(securityMW.SecurityHeaders())
	app.Use(securityMW.LogSecurityEvents())
	app.Use(securityMW.TimeoutMiddleware(30 * time.Second))
	app.Use(securityMW.RequestSizeLimit(10 * 1024 * 1024)) // 10MB
	app.Use(securityMW.ValidateUserAgent())
	app.Use(securityMW.ValidateContentType("application/json", "application/x-www-form-urlencoded", "multipart/form-data"))
	app.Use(securityMW.InputSanitization())
	app.Use(securityMW.RateLimit(100, 1*time.Minute)) // 100 requests per minute global

	// Add Helmet middleware for security headers
	app.Use(helmet.New(helmet.Config{
		XSSProtection:         "1; mode=block",
		ContentTypeNosniff:    "nosniff",
		XFrameOptions:         "DENY",
		HSTSMaxAge:            31536000,
		HSTSPreloadEnabled:    true,
		ContentSecurityPolicy: "default-src 'self'",
		ReferrerPolicy:        "strict-origin-when-cross-origin",
	}))

	// Configure CORS
	allowedOrigin := os.Getenv("CORS_ALLOWED_ORIGIN")
	if allowedOrigin == "" {
		allowedOrigin = "http://localhost:5173"
	}

	app.Use(cors.New(cors.Config{
		AllowOrigins:     allowedOrigin,
		AllowHeaders:     "Origin, Content-Type, Accept, Authorization, X-Requested-With",
		AllowMethods:     "GET, POST, PUT, DELETE, OPTIONS, PATCH",
		AllowCredentials: true,
		MaxAge:           86400, // 24 hours
	}))

	// Add request logging middleware
	app.Use(func(c *fiber.Ctx) error {
		start := time.Now()

		// Process request
		err := c.Next()

		// Log request
		duration := time.Since(start)
		logging.InfoResponse(
			c.Method(),
			c.Path(),
			c.Response().StatusCode(),
			duration.String(),
		)

		return err
	})

	// Swagger documentation
	app.Get("/swagger/*", swagger.HandlerDefault)

	// Health check endpoint
	app.Get("/health", func(c *fiber.Ctx) error {
		return c.JSON(fiber.Map{
			"status":    "healthy",
			"timestamp": time.Now().UTC().Format(time.RFC3339),
			"version":   "1.0.0",
		})
	})

	// Ping endpoint
	app.Get("/ping", func(c *fiber.Ctx) error {
		return c.SendString("pong")
	})

	// Initialize API routes
	api.Init(di, app)

	// 404 handler
	app.Use(func(c *fiber.Ctx) error {
		return c.Status(fiber.StatusNotFound).JSON(fiber.Map{
			"error": "Route not found",
			"path":  c.Path(),
		})
	})

	// Get port from environment
	port := os.Getenv("PORT")
	if port == "" {
		port = "3000" // Default port
	}

	logging.Info("Starting server on port %s", port)
	logging.Info("Swagger documentation available at: http://localhost:%s/swagger/", port)
	logging.Info("Health check available at: http://localhost:%s/health", port)

	// Start server
	if err := app.Listen(":" + port); err != nil {
		logging.Error("Failed to start server: %v", err)
		os.Exit(1)
	}

	return app
}