package main

import (
	"flag"
	"log"
	"os"
	"os/signal"
	"path"
	"strconv"
	"syscall"

	"gopkg.in/fsnotify.v1"
)

var (
	TeamsDir        string
	skipInitialSync bool
)

func main() {
	flag.StringVar(&TeamsDir, "teams", "./TEAMS", "Base directory where save teams JSON files")
	var debugINotify = flag.Bool("debuginotify", false, "Show skipped inotofy events")
	flag.BoolVar(&skipInitialSync, "skipinitialsync", skipInitialSync, "Skip the initial synchronization")
	flag.Parse()

	api := AirbusAPI{
		BaseURL: "https://portal.european-cybercup.lan/api/v1",
	}

	if v, exists := os.LookupEnv("AIRBUS_BASEURL"); exists {
		api.BaseURL = v
	}
	if v, exists := os.LookupEnv("AIRBUS_TOKEN"); exists {
		api.Token = v
	}
	if v, exists := os.LookupEnv("AIRBUS_SESSIONID"); exists {
		var err error
		api.SessionID, err = strconv.ParseUint(v, 10, 64)
		if err != nil {
			log.Fatal("AIRBUS_SESSIONID is invalid: ", err.Error())
		}
	}

	log.SetPrefix("[challenge-sync-airbus] ")

	TeamsDir = path.Clean(TeamsDir)

	log.Println("Registering directory events...")
	watcher, err := fsnotify.NewWatcher()
	if err != nil {
		log.Fatal(err)
	}
	defer watcher.Close()

	if err := watcher.Add(TeamsDir); err != nil {
		log.Fatal(err)
	}

	if !skipInitialSync {
		if _, err := os.Stat(path.Join(TeamsDir, "teams.json")); err == nil {
			treatAll(path.Join(TeamsDir, "teams.json"))
		}
	}

	// Register SIGUSR1, SIGUSR2
	interrupt := make(chan os.Signal, 1)
	signal.Notify(interrupt, syscall.SIGHUP)

	watchedNotify := fsnotify.Create

	for {
		select {
		case <-interrupt:
			log.Println("SIGHUP received, resyncing all teams' score...")
			treatAll(path.Join(TeamsDir, "teams.json"))
			log.Println("SIGHUP treated.")
		case ev := <-watcher.Events:
			if path.Base(ev.Name) == "teams.json" {
				if ev.Op&watchedNotify == watchedNotify {
					if *debugINotify {
						log.Println("Treating event:", ev, "for", ev.Name)
					}
					go treatDiff(ev.Name)
				} else if ev.Op&fsnotify.Write == fsnotify.Write {
					log.Println("FSNOTIFY WRITE SEEN. Prefer looking at them, as it appears files are not atomically moved.")
					watchedNotify = fsnotify.Write
					go treatDiff(ev.Name)
				} else if *debugINotify {
					log.Println("Skipped teams.json event:", ev)
				}
			} else if *debugINotify {
				log.Println("Skipped NON teams.json event:", ev, "for", ev.Name)
			}
		case err := <-watcher.Errors:
			log.Println("error:", err)
		}
	}
}