package main

import (
	"context"
	"gralias/config"
	"gralias/crons"
	"gralias/handlers"
	"gralias/repos"
	"log/slog"
	"net/http"
	"os"
	"os/signal"
	"path/filepath"
	"strings"
	"syscall"
	"time"
)

var cfg *config.Config

func init() {
	cfg = config.LoadConfigOrDefault("")
}

// GzipFileServer serves pre-compressed .gz files if available
func GzipFileServer(root http.FileSystem) http.Handler {
	fs := http.FileServer(root)
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// Check if client accepts gzip
		if strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
			// Check for .gz version of the file
			gzPath := r.URL.Path + ".gz"
			if file, err := root.Open(gzPath); err == nil {
				file.Close()
				// Set headers for gzip
				w.Header().Set("Content-Encoding", "gzip")
				w.Header().Set("Content-Type", getContentType(r.URL.Path))
				r.URL.Path = gzPath
			}
		}
		fs.ServeHTTP(w, r)
	})
}

// Helper to set correct Content-Type
func getContentType(path string) string {
	switch filepath.Ext(path) {
	case ".css":
		return "text/css"
	case ".js":
		return "application/javascript"
	default:
		return "" // http.FileServer will detect it
	}
}

func ListenToRequests(port string) *http.Server {
	mux := http.NewServeMux()
	server := &http.Server{
		Handler: handlers.LogRequests(handlers.GetSession(mux)),
		Addr:    ":" + port,
		// ReadTimeout:  time.Second * 5, // does this timeout conflict with sse connection?
		WriteTimeout: 0, // sse streaming
	}
	// fs := http.FileServer(http.Dir("assets/"))
	fs := http.Dir("assets/")
	mux.Handle("GET /assets/", http.StripPrefix("/assets/", GzipFileServer(fs)))
	//
	mux.HandleFunc("GET /ping", handlers.HandlePing)
	mux.HandleFunc("GET /", handlers.HandleHome)
	mux.HandleFunc("POST /login", handlers.HandleFrontLogin)
	mux.HandleFunc("POST /join-team", handlers.HandleJoinTeam)
	mux.HandleFunc("GET /end-turn", handlers.HandleEndTurn)
	mux.HandleFunc("POST /room-create", handlers.HandleCreateRoom)
	mux.HandleFunc("GET /start-game", handlers.HandleStartGame)
	mux.HandleFunc("GET /room-join", handlers.HandleJoinRoom)
	mux.HandleFunc("POST /give-clue", handlers.HandleGiveClue)
	mux.HandleFunc("GET /room/exit", handlers.HandleExit)
	//elements
	mux.HandleFunc("GET /actionhistory", handlers.HandleActionHistory)
	mux.HandleFunc("GET /room/createform", handlers.HandleShowCreateForm)
	mux.HandleFunc("GET /room/hideform", handlers.HandleHideCreateForm)
	mux.HandleFunc("GET /word/show-color", handlers.HandleShowColor)
	mux.HandleFunc("POST /check/name", handlers.HandleNameCheck)
	mux.HandleFunc("GET /add-bot", handlers.HandleAddBot)
	mux.HandleFunc("GET /remove-bot", handlers.HandleRemoveBot)
	mux.HandleFunc("GET /mark-card", handlers.HandleMarkCard)
	// special
	mux.HandleFunc("GET /renotify-bot", handlers.HandleRenotifyBot)
	// sse
	mux.Handle("GET /sub/sse", handlers.Notifier)
	slog.Info("Listening", "addr", port)
	return server
}

func main() {
	// Setup graceful shutdown
	stop := make(chan os.Signal, 1)
	signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
	// repo := repos.NewRepoProvider(cfg.DBPath)
	repo := repos.RP
	defer repo.Close()
	cm := crons.NewCronManager(repo, slog.Default())
	cm.Start()
	server := ListenToRequests(cfg.ServerConfig.Port)
	go func() {
		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			panic(err)
		}
	}()
	<-stop
	slog.Info("Shutting down server...")
	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
	defer cancel()
	if err := server.Shutdown(ctx); err != nil {
		slog.Error("server shutdown failed", "error", err)
	}
}