package main

import (
	"fmt"
	"html/template"
	"log"
	"net/http"
	"os"
	"path/filepath"
	"time"

	"github.com/alexedwards/scs/v2"
	"github.com/joho/godotenv"
)

var sessionManager *scs.SessionManager

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

	// handle authentication
	sessionManager = scs.New()
	sessionManager.Lifetime = 24 * time.Hour

	// handle frontend views
	webDir := "./web/dist"
	fs := http.FileServer(http.Dir(webDir))

	http.Handle("/", sessionManager.LoadAndSave(
		http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
			if request.URL.Path != "/" {
				path := filepath.Join(webDir, filepath.Clean(request.URL.Path))
				_, err := os.Stat(path)
				if err == nil {
					fs.ServeHTTP(writer, request)
					return
				}
			}
			handler(writer, request)
		}),
	))

	port := os.Getenv("HTTP_PORT")
	if port == "" {
		port = "8080"
	}
	addr := ":" + port
	fmt.Printf("Server listening on http://localhost%s\n", addr)
	if err := http.ListenAndServe(addr, nil); err != nil {
		log.Fatalf("server error: %v", err)
	}
}

func handler(writer http.ResponseWriter, request *http.Request) {
	templ := template.Must(template.ParseFiles("./web/dist/index.html"))

	templ.Execute(writer, nil)
}