package main

import (
	_ "embed"
	"fmt"
	"log"
	"os"
	"os/signal"
	"syscall"
	"net/http"
	"time"

	"github.com/gorilla/mux"
)

const (
	Addr = "127.0.0.1:8000"
	ReadTimeout = 15 * time.Second
	WriteTimeout = 15 * time.Second
)

//go:embed VERSION.txt
var versionTxt string

func main() {
	run()
}

func run() {
	log.Println("finserv finance server was started.")
	defer log.Println("finserv finance server was stopped.")

	r := mux.NewRouter()

	r.HandleFunc("/", hello)
	r.HandleFunc("/version", version)

	srv := &http.Server{
		Handler:      r,
		Addr:         Addr,
		WriteTimeout: WriteTimeout,
		ReadTimeout:  ReadTimeout,
	}

	go srv.ListenAndServe()
	log.Printf("Serving at http://%s\n", Addr)

	await(syscall.SIGTERM, syscall.SIGINT)
}

func hello(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintln(w, "Hello world!")
}

func version(w http.ResponseWriter, r *http.Request) {
	fmt.Fprint(w, versionTxt)
}

func await(signals ...syscall.Signal) {
	listener := make(chan os.Signal, 1)
	for _, s := range signals {
		signal.Notify(listener, s)
	}
	sig := <-listener
	log.Printf("Received OS signal '%v'\n", sig)
}