package main

import (
	"context"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"git.dws.rip/DWS/dyn/internal/config"
	"git.dws.rip/DWS/dyn/internal/database"
	"git.dws.rip/DWS/dyn/internal/dns"
	"git.dws.rip/DWS/dyn/internal/handlers"
	"git.dws.rip/DWS/dyn/internal/middleware"
	"github.com/gin-gonic/gin"
)

func main() {
	cfg := config.Load()

	if errs := cfg.Validate(); len(errs) > 0 {
		for _, err := range errs {
			log.Printf("Configuration error: %s", err)
		}
		os.Exit(1)
	}

	db, err := database.New(cfg.DatabasePath)
	if err != nil {
		log.Fatalf("Failed to initialize database: %v", err)
	}
	defer db.Close()

	dnsClient := dns.NewClient(
		cfg.TechnitiumURL,
		cfg.TechnitiumToken,
		cfg.TechnitiumUsername,
		cfg.TechnitiumPassword,
	)

	rateLimiter := middleware.NewRateLimiter(cfg.RateLimitPerIP, cfg.RateLimitPerToken)

	gin.SetMode(gin.ReleaseMode)
	router := gin.New()
	router.Use(gin.Recovery())

	if len(cfg.TrustedProxies) > 0 {
		router.SetTrustedProxies(cfg.TrustedProxies)
	}

	router.Static("/static", "./web/static")
	router.LoadHTMLGlob("web/templates/*")

	webHandler := handlers.NewWebHandler(db, cfg)
	dynHandler := handlers.NewDynDNSHandler(db, dnsClient, cfg)

	router.GET("/", webHandler.Index)

	api := router.Group("/api")
	api.Use(rateLimiter.RateLimitByIP())
	{
		api.GET("/check", webHandler.CheckSubdomain)
		api.POST("/claim", webHandler.ClaimSpace)

		nic := api.Group("/nic")
		nic.Use(rateLimiter.RateLimitByToken())
		nic.GET("/update", dynHandler.Update)
	}

	port := cfg.ServerPort
	if port == "" {
		port = "8080"
	}

	srv := &http.Server{
		Addr:    ":" + port,
		Handler: router,
	}

	go func() {
		log.Printf("Server starting on port %s", port)
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("Failed to start server: %v", err)
		}
	}()

	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit

	log.Println("Shutting down server...")

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	if err := srv.Shutdown(ctx); err != nil {
		log.Printf("Server forced to shutdown: %v", err)
	}

	log.Println("Server exited")
}