package main

import (
	"flag"
	"log"
	"runtime/debug"
	"time"

	"github.com/facebookarchive/flagenv"
	_ "github.com/joho/godotenv/autoload"
	"github.com/matrix-org/gomatrix"
)

var (
	username   = flag.String("matrix-username", "xatci", "Matrix bot username")
	password   = flag.String("matrix-password", "hunter2", "Matrix bot password")
	homeserver = flag.String("matrix-homeserver", "", "Matrix homeserver")
	botName    = flag.String("bot-name", "xatci", "Bot name")
)

func main() {
	flagenv.Parse()
	flag.Parse()

	cli, err := gomatrix.NewClient(*homeserver, "", "")
	if err != nil {
		panic(err)
	}

	resp, err := cli.Login(&gomatrix.ReqLogin{
		Type:     "m.login.password",
		User:     *username,
		Password: *password,
	})
	if err != nil {
		panic(err)
	}
	cli.SetCredentials(resp.UserID, resp.AccessToken)
	log.Printf("logged in as %s to %s", resp.UserID, *homeserver)

	x := Xatci{Client: cli}

	cli.Syncer.(*gomatrix.DefaultSyncer).OnEventType("m.room.member", func(event *gomatrix.Event) {
		// If I was invited
		if event.Content["membership"] == "invite" && *event.StateKey == cli.UserID {
			if _, err := cli.JoinRoom(event.RoomID, "", nil); err != nil {
				log.Printf("joining %s", event.RoomID)
				log.Println("Join error: ", err)
			}
		}
	})

	cli.Syncer.(*gomatrix.DefaultSyncer).OnEventType("m.room.message", func(event *gomatrix.Event) {
		// Tell the room if the callback went south
		defer func() {
			if r := recover(); r != nil {
				log.Printf("%s: %s", r, debug.Stack())
				cli.SendText(event.RoomID, "Argh! I panicked.")
			}
		}()
		// If I did not send this message
		if event.Sender != cli.UserID {
			if body, ok := event.Body(); ok {
				x.onText(event.RoomID, event.Sender, body)
			}
		}
	})

	for range time.Tick(250 * time.Millisecond) {
		if err := cli.Sync(); err != nil {
			log.Println("Sync error: ", err)
		}
	}
}

type Xatci struct {
	*gomatrix.Client
}

func (x *Xatci) onText(roomID string, userID string, text string) {
	log.Printf("%s: <%s> %s", roomID, userID, text)
}