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let minsPerRound = Number(sessionStorage.getItem("minsPerRound")) || 12;
let timerRunningFlag = Number(sessionStorage.getItem("timerRunningFlag")) || 0;
let deadline =
  Number(sessionStorage.getItem("deadline")) || new Date().getTime();
let clock = 0;

function setTimer(m, s) {
  let timer = document.getElementById("timer-display");
  m = m < 10 ? "0" + m : m;
  s = s < 10 ? "0" + s : s;
  timer.value = `${m}:${s}`;
}

function setSessionData() {
  sessionStorage.setItem("deadline", deadline);
  sessionStorage.setItem("minsPerRound", minsPerRound);
  sessionStorage.setItem("timerRunningFlag", timerRunningFlag);
}

function resetTimer() {
  clearInterval(clock);
  let mins = Math.floor(minsPerRound);
  let secs = (minsPerRound - mins) * 60;
  setTimer(mins, secs);
  timerRunningFlag = 0;
  setSessionData();
}

function updateTimer(milliseconds) {
  const m = Math.floor((milliseconds % (1000 * 60 * 60)) / (1000 * 60));
  const s = Math.floor((milliseconds % (1000 * 60)) / 1000);
  setTimer(m, s);
}

function refreshTimer() {
  const now = new Date().getTime();
  const millisecondsToDeadline = deadline - now;
  if (millisecondsToDeadline > 0) {
    updateTimer(millisecondsToDeadline);
    return;
  }
  resetTimer();
  const notification = new Notyf({
    duration: 0,
    position: { x: "center", y: "top" },
    dismissible: true,
  });
  notification.error("Round completed");
}

function startTimer(fresh) {
  if (fresh) {
    let now = new Date().getTime();
    const millisecondsToDeadline = minsPerRound * 60 * 1000;
    deadline = now + millisecondsToDeadline;
  }
  timerRunningFlag = 1;
  setSessionData();
  clock = setInterval(refreshTimer, 1000);
}

window.onload = function () {
  if (timerRunningFlag) startTimer(0);
  else resetTimer();

  document.getElementById("timer-start").addEventListener("click", () => {
    if (timerRunningFlag != 0) return;
    startTimer(1);
  });

  document.getElementById("timer-stop").addEventListener("click", () => {
    resetTimer();
  });

  document.getElementById("timer-inc").addEventListener("click", () => {
    if (timerRunningFlag == 0) {
      minsPerRound += 0.5;
      resetTimer();
    }
  });

  document.getElementById("timer-dec").addEventListener("click", () => {
    if (timerRunningFlag == 0 && minsPerRound != 0) {
      minsPerRound -= 0.5;
      resetTimer();
    }
  });
};