twitch-subathon-timer/timer.js

window.addEventListener("DOMContentLoaded", () => {
  const websocket = new WebSocket("ws://adamwalsh.name:9533");

  websocket.addEventListener("open", () => {
    communicate(websocket);
  });

});


class Timer {
  constructor(renderer, end_time, running) {
    this.renderer = renderer;
    this.end_time = end_time;
    this.running = running;

    this.destroying = false;
  }

  render_time() {
    // Render timer status to the document
    var timestr;

    if (this.counter < 0) {
      timestr = "--:--";
    } else {
      // How many seconds have passed in this block
      var dur_seconds = Math.floor( (this.end_time - new Date()) / 1000);
      var seconds = dur_seconds % 60;
      dur_seconds = dur_seconds - seconds;
      var minutes = Math.floor(dur_seconds / 60);
      var hours = Math.floor(minutes / 60);
      minutes = minutes - 60 * hours;

      timestr = String(hours).padStart(2, '0') + ':' + String(minutes).padStart(2, '0');
    }

    if (this.running) {
      this.renderer.update_time(timestr);
    }
  }

  tick() {
    // Recursive call run per second to update and change stage

    if (this.destroying) {
      return
    }
    this.render_time();
    setTimeout(this.tick.bind(this), 1000);
  }
}

class TimerRenderer {
  constructor (){
    this.background = document.getElementsByClassName("timer-bg")[0];
    this.time_element = document.getElementsByClassName("timer-time")[0];

    this.bg_width = parseInt(
      window.getComputedStyle(
        this.background, null
      ).getPropertyValue('width'),
      10
    );
    this.bg_height = parseInt(
      window.getComputedStyle(
        this.background, null
      ).getPropertyValue('height'),
      10
    )
  }

  update_time (timestr) {
    this.time_element.textContent = timestr;
  }

  set_break_color () {
    this.background.style.setProperty('--stage-color', 'var(--break-color)');
    this.time_element.style.color = "var(--break-color)";
  }

  set_focus_color () {
    this.background.style.setProperty('--stage-color', 'var(--focus-color)');
    this.time_element.style.color = "var(--focus-color)";
  }

}

function rectBounds(prop, rectHeight, rectWidth) {
  var totalCircum = 2 * rectHeight + 2 * rectWidth;
  var propCircum = prop * totalCircum;
  let bounds;

  if (propCircum < rectWidth / 2) {
    var xprop = Math.floor((
      (rectWidth/2 + propCircum) / rectWidth
    ) * 1000)/10;
    bounds = [
      "50% -5%",
      `${xprop}% -5%`,
      `${xprop}% 4%`,
      "50% 4%"
    ];
  } else if (propCircum < rectWidth / 2 + rectHeight) {
    var yprop = (
      (propCircum - rectWidth / 2) / rectHeight
    ) * 100;
    bounds = [
      "50% -5%", "110% -5%",
      `110% ${yprop}%`, `96% ${yprop}%`,
      "95% 4%", "50% 4%"
    ];
  } else if (propCircum < 3 * rectWidth / 2 + rectHeight) {
    var xprop = (
      ((3 * rectWidth/2 + rectHeight) - propCircum) / rectWidth
    ) * 100;
    bounds = [
      "50% -5%", "110% -5%",
      "110% 110%",
      `${xprop}% 110%`, `${xprop}% 96%`,
      "95% 96%",
      "95% 4%", "50% 4%"
    ];
  } else if (propCircum < 3 * rectWidth / 2 + 2 * rectHeight) {
    var yprop = (
      ((3 * rectWidth/2 + 2 * rectHeight) - propCircum) / rectHeight
    ) * 100;
    bounds = [
      "50% -5%", "110% -5%",
      "110% 110%", "-5% 110%",
      `-5% ${yprop}%`, `4% ${yprop}%`,
      "5% 96%", "95% 96%",
      "95% 4%", "50% 4%"
    ];
  } else {
    var xprop = (
      (propCircum - (3 * rectWidth/2 + 2 * rectHeight)) / rectWidth
    ) * 100;
    bounds = [
      "50% -5%", "110% -5%",
      "110% 110%", "-5% 110%",
      "-5% -5%",
      `${xprop}% -5%`, `${xprop}% 4%`,
      "4% 4%",
      "5% 96%", "95% 96%",
      "95% 4%", "50% 4%"
    ];
  }
  return bounds;
}

function communicate(websocket) {
  console.log("Communicating");
  const params = new URLSearchParams(window.location.search);
  websocket.send(JSON.stringify({type: "init", channel: "SubTimer", channelid: params.get('channelid')}));

  var renderer = new TimerRenderer();
  let timer;

  websocket.addEventListener("message", ({ data }) => {
    console.log("Rec Event " + data);
    const event = JSON.parse(data);
    switch (event.type) {
      case "DO":
        let args = event.args;

        // Call the specified method
        switch (event.method) {
          case "setTimer":
            if (timer != null) {
              timer.destroying = true;
            }
            timer = new Timer(
              renderer, 
              new Date(args.end_at),
              true
            )
            timer.tick();
            timer.running = args.running;
            break;
          default:
            throw new Error(`Unsupported method requested: ${event.method}.`)
        }
        break;
      default:
        throw new Error(`Unsupported event type: ${event.type}.`);
    }
  });
}