package main

import (
	"basic-sensor-receiver/app"
	"basic-sensor-receiver/middleware"
	"basic-sensor-receiver/routes"
	"context"
	"fmt"
	"log"
	"net/http"
	"os/signal"
	"syscall"

	"github.com/gin-gonic/gin"
	"github.com/joho/godotenv"
	_ "github.com/mattn/go-sqlite3"
)

func main() {
	err := godotenv.Load()
	if err != nil {
		log.Println("Error loading .env file: ", err)
	}

	server := app.InitializeServer()

	gin.SetMode(server.Config.Mode)

	router := gin.Default()

	// Front-end resources
	router.StaticFile("/", "client/index.html")
	router.Static("/assets", "client/assets")

	// Only allow CORS in development mode
	if server.Config.Mode == "debug" {
		router.Use(middleware.CorsMiddleware())
	}

	if server.Config.AuthEnabled {
		// User login route
		router.POST("/api/login", routes.Login(server))
	}

	// Routes that are only accessible after logging in
	loginProtected := router.Group("/", middleware.LoginAuthMiddleware(server))
	loginProtected.GET("/api/sensors", routes.GetSensors(server))
	loginProtected.POST("/api/sensors", routes.PostSensors(server))
	loginProtected.GET("/api/sensors/:sensor", routes.GetSensor(server))
	loginProtected.PUT("/api/sensors/:sensor", routes.PutSensor(server))
	loginProtected.DELETE("/api/sensors/:sensor", routes.DeleteSensor(server))
	loginProtected.GET("/api/sensors/:sensor/values/latest", routes.GetSensorLatestValue(server))
	loginProtected.GET("/api/sensors/:sensor/values", routes.GetSensorValues(server))
	//loginProtected.GET("/api/sensors/:sensor/config", routes.GetSensorConfig(server))
	//loginProtected.PUT("/api/sensors/:sensor/config/:key", routes.PutSensorConfig(server))
	loginProtected.GET("/api/dashboards", routes.GetDashboards(server))
	loginProtected.POST("/api/dashboards", routes.PostDashboard(server))
	loginProtected.GET("/api/dashboards/:id", routes.GetDashboardById(server))
	loginProtected.PUT("/api/dashboards/:id", routes.PutDashboard(server))
	loginProtected.DELETE("/api/dashboards/:id", routes.DeleteDashboard(server))
	loginProtected.GET("/api/alerts", routes.GetAlerts(server))
	loginProtected.POST("/api/alerts", routes.PostAlerts(server))
	loginProtected.GET("/api/alerts/:alertId", routes.GetAlert(server))
	loginProtected.PUT("/api/alerts/:alertId", routes.PutAlert(server))
	loginProtected.DELETE("/api/alerts/:alertId", routes.DeleteAlert(server))
	loginProtected.GET("/api/contact-points", routes.GetContactPoints(server))
	loginProtected.POST("/api/contact-points", routes.PostContactPoints(server))
	loginProtected.GET("/api/contact-points/:contactPointId", routes.GetContactPoint(server))
	loginProtected.PUT("/api/contact-points/:contactPointId", routes.PutContactPoint(server))
	loginProtected.DELETE("/api/contact-points/:contactPointId", routes.DeleteContactPoint(server))
	loginProtected.POST("/api/contact-points/test", routes.TestContactPoint(server))
	loginProtected.GET("/api/mqtt/brokers", routes.GetMQTTBrokers(server))
	loginProtected.POST("/api/mqtt/brokers", routes.PostMQTTBroker(server))
	loginProtected.GET("/api/mqtt/brokers/:brokerId", routes.GetMQTTBroker(server))
	loginProtected.PUT("/api/mqtt/brokers/:brokerId", routes.PutMQTTBroker(server))
	loginProtected.DELETE("/api/mqtt/brokers/:brokerId", routes.DeleteMQTTBroker(server))
	loginProtected.POST("/api/mqtt/brokers/:brokerId/publish", routes.PostMQTTBrokerPublish(server))

	if server.Config.AuthEnabled {
		loginProtected.POST("/api/logout", routes.Logout(server))
	}

	// Routes accessible using auth key
	keyProtected := router.Group("/", middleware.KeyAuthMiddleware(server))
	keyProtected.POST("/api/sensors/:sensor/values", routes.PostSensorValues(server))

	// Starts session cleanup goroutine
	server.StartCleaner()

	// Starts alerts handling goroutine
	server.StartAlerts()

	// Graceful shutdown using SIGTERM or SIGINT
	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer stop()

	// Prepare http server
	address := fmt.Sprintf("%s:%d", server.Config.Ip, server.Config.Port)
	srv := &http.Server{
		Addr:    address,
		Handler: router,
	}

	// Run the server in a goroutine so that it doesn't block and we can stop it later
	go func() {
		log.Println("Running server on", address)

		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("Listen: %s\n", err)
		}
	}()

	// Wait for shutdown signal
	<-ctx.Done()

	// Shutdown the server
	log.Println("Shutting down server...")

	if err := srv.Shutdown(context.TODO()); err != nil {
		log.Fatalf("Server shutdown failed: %v", err)
	}

	if err := server.DB.Close(); err != nil {
		log.Fatalf("Database close failed: %v", err)
	}

	log.Println("Server stopped")
}