package main

import (
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
	"strconv"
	"time"

	"git.rootprojects.org/root/go-again/data/jsondb"
)

func main() {
	portEnv := os.Getenv("PORT")

	portInt := flag.Int("port", 0, "port on which to serve http")
	addr := flag.String("addr", "", "address on which to serve http")
	flag.Parse()

	if "" != portEnv {
		if 0 != *portInt {
			log.Fatal("You may set PORT or --port, but not both.")
			return
		}
		n, err := strconv.Atoi(portEnv)
		if nil != err {
			log.Fatalf("Could not parse PORT=%q.", n)
			return
		}
		*portInt = n
	}
	if *portInt < 1024 || *portInt > 65535 {
		log.Fatalf("port should be between 1024 and 65535, not %d.", *portInt)
		return
	}
	portEnv = strconv.Itoa(*portInt)

	server := &http.Server{
		Addr:           fmt.Sprintf("%s:%s", *addr, portEnv),
		Handler:        http.HandlerFunc(handleFunc),
		ReadTimeout:    10 * time.Second,
		WriteTimeout:   10 * time.Second,
		MaxHeaderBytes: 1 << 20,
	}

	fmt.Println("Listening on", server.Addr)
	log.Fatal(server.ListenAndServe())
}

func handleFunc(w http.ResponseWriter, r *http.Request) {
	jsondb.List()
	w.Write([]byte("Hello, World!"))
}