package main

import (
	"flag"
	"log"
	"net/http"
	"os"
	"path"
	"path/filepath"
	"strings"

	"google.golang.org/appengine"
)

func main() {
	exePath, err := filepath.Abs(filepath.Dir(os.Args[0]))
	if err != nil {
		panic(err)
	}
	exePath = "."

	directory := flag.String("d", path.Join(exePath, "public"), "the directory of static file to host")
	flag.Parse()

	http.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Scheme == "http" || strings.HasPrefix(r.Host, "http:") {
			r.URL.Scheme = "https"
			http.Redirect(w, r, r.URL.String(), http.StatusTemporaryRedirect)
			return
		}
		http.FileServer(http.Dir(*directory)).ServeHTTP(w, r)
	}))

	log.Printf("Serving %s\n", *directory)

	appengine.Main()
}