package main

import (
	"flag"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"os/exec"

	"github.com/gorilla/mux"
	"github.com/unixvoid/glogger"
)

var (
	loglevel        string
	recordlocation  string
	reclistlocation string
	port            = 8080
)

func main() {
	// init runtime args
	flag.StringVar(&loglevel, "loglevel", "debug", loglevel)
	flag.StringVar(&recordlocation, "recordlocation", "record", recordlocation)
	flag.StringVar(&reclistlocation, "reclistlocation", "reclist", reclistlocation)
	flag.Parse()

	// init config file and logger
	initLogger(loglevel)

	// make sure record file exists
	if _, err := os.Stat(recordlocation); os.IsNotExist(err) {
		glogger.Info.Printf("record file not found in %s\n", recordlocation)
		fmt.Printf("%s\n", err)
		os.Exit(1)
	}
	// make sure reclist bin exists
	if _, err := os.Stat(reclistlocation); os.IsNotExist(err) {
		glogger.Info.Printf("reclist binary not found in %s\n", reclistlocation)
		fmt.Printf("%s\n", err)
		os.Exit(1)
	}

	// router
	router := mux.NewRouter()
	router.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		gethighscore(w, r)
	}).Methods("GET")

	glogger.Info.Println("nethack-score-api running http on", port)
	log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", port), router))
}

func initLogger(loglevel string) {
	// init logger
	if loglevel == "debug" {
		glogger.LogInit(os.Stdout, os.Stdout, os.Stdout, os.Stderr)
	} else if loglevel == "cluster" {
		glogger.LogInit(os.Stdout, os.Stdout, ioutil.Discard, os.Stderr)
	} else if loglevel == "info" {
		glogger.LogInit(os.Stdout, ioutil.Discard, ioutil.Discard, os.Stderr)
	} else {
		glogger.LogInit(ioutil.Discard, ioutil.Discard, ioutil.Discard, os.Stderr)
	}
}

func gethighscore(w http.ResponseWriter, r *http.Request) {
	// run script
	output, err := exec.Command(reclistlocation,
		"-f",
		recordlocation).CombinedOutput()
	if err != nil {
		fmt.Printf("%s\n", err)
	}

	fmt.Fprintf(w, "%s\n", output)
}