const GPIO = require("onoff").Gpio;
const WS = require("ws");

const HEARTBEAT_INT = 400;

const button = new GPIO(4, "in", "both", {debounceTimeout: 30, activeLow: true});
const ledOnAir = new GPIO(24, "low");
const ledReady = new GPIO(23, "low");

const ws = new WS('ws://10.0.0.4:2000');

let currentID = 0;

let heartBeat;

ws.on('open', () => {

  button.watch((e, value) => {
    if(e) {
      console.error("Error on button watch:", e);
      return;
    }
    if(value) {
      ws.send(JSON.stringify({type: 'button-press'}));
    } else {
        ws.send(JSON.stringify({type: 'button-release'}));
    }

    ledOnAir.write(value, (e) => e && console.error("Error writing to led: ", e));
  });
  heartBeat = setInterval(() => {
    button.read((e, buttonState) => {
      console.log("Button state!", buttonState);
      if(e) {
        return console.error("Error reading button state!", e);
      }
      ws.send(JSON.stringify({
        type: 'button-update', 
        body: {buttonState}
      }));
    });
  }, 400);
  ledReady.write(1, console.error);
});

ws.on('error', (e) => {
  console.error(e);
  cleanup();
  process.exit();
});

function cleanup() {
  ledOnAir.unexport();
  ledReady.unexport();
  button.unexport();
  ws.close();
  if(heartBeat) {
    cancelInterval(heartBeat);
    heartBeat = null;
  }
}

process.on('SIGINT', () => {
  cleanup();
});