package main

import (
	"context"
	"errors"
	"log/slog"
	"net/http"
	"os"
	"os/signal"

	"git.t-juice.club/torjus/ghettoptt/bus"
	"git.t-juice.club/torjus/ghettoptt/debouncer"
	"git.t-juice.club/torjus/ghettoptt/metrics"
	"github.com/holoplot/go-evdev"
	"github.com/prometheus/client_golang/prometheus/promhttp"
)

const Version = "v0.1.3"

func main() {
	// Setup logger
	h := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelInfo})
	logger := slog.New(h)
	slog.SetDefault(logger)

	// Setup signal handler
	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
	defer stop()

	// Setup metrics
	m := metrics.NewMumbleMetricsCollector()

	mbus := bus.NewMumbleBus(m)
	defer mbus.Close()

	// Start reading input events
	input, err := evdev.OpenWithFlags("/dev/input/by-id/usb-SteelSeries_SteelSeries_Rival_710_Gaming_Mouse-if02-event-kbd", os.O_RDONLY)
	if err != nil {
		panic(err)
	}
	defer input.Close()
	input.NonBlock()

	var done bool

	// Start metrics server
	srvCtx, srvCancel := context.WithCancel(context.Background())
	defer srvCancel()
	go func() {
		mux := http.NewServeMux()
		mux.Handle("/metrics", promhttp.Handler())
		srv := http.Server{
			Handler: mux,
			Addr:    ":8989",
		}
		go func() {
			<-ctx.Done()
			srv.Shutdown(context.Background())
			srvCancel()
		}()

		slog.Info("Starting metrics server", "addr", srv.Addr)
		srv.ListenAndServe()
	}()

	// Listen for context cancellation
	go func() {
		<-ctx.Done()
		done = true
		input.Close()
	}()

	// Start listening for PTT key
	slog.Info("Starting event listener", "version", Version)
	eventCh := make(chan bool)
	doneCtx, doneCancel := context.WithCancel(srvCtx)
	defer doneCancel()

	debouncer := debouncer.New(eventCh)
	go func() {
		var done bool
		for !done {
			ev, err := input.ReadOne()
			if err != nil {
				if errors.Is(err, os.ErrClosed) {
					continue
				}
				slog.Error("Error reading from input device", "error", err)
				mbus.StopTalking()
				os.Exit(1)
			}
			if ev.Code == evdev.KEY_F24 && ev.Value == 1 {
				slog.Debug("PTT ON")
				eventCh <- true
			}
			if ev.Code == evdev.KEY_F24 && ev.Value == 0 {
				slog.Debug("PTT OFF")
				eventCh <- false
			}
			if doneCtx.Err() != nil {
				close(eventCh)
				done = true
			}
		}
	}()

	for v := range debouncer.C {
		if v {
			mbus.StartTalking()
			slog.Info("Started talking")
		} else {
			mbus.StopTalking()
			slog.Info("Stopped talking")
		}
	}

	mbus.StopTalking()
	<-srvCtx.Done()
	slog.Info("Exiting")
}