#9 - Real, User Based Countdown v0.1

<!-- 💙 MEMBERSCRIPT #9 v0.1 💙 COUNTDOWN BY USER -->
<script>
// Step 1: Get the current date and time
const currentDate = new Date();

// Step 2: Calculate the new date and time based on the attribute values
const addTime = (date, unit, value) => {
  const newDate = new Date(date);
  switch (unit) {
    case 'hour':
      newDate.setHours(newDate.getHours() + value);
      break;
    case 'minute':
      newDate.setMinutes(newDate.getMinutes() + value);
      break;
    case 'second':
      newDate.setSeconds(newDate.getSeconds() + value);
      break;
    case 'millisecond':
      newDate.setMilliseconds(newDate.getMilliseconds() + value);
      break;
  }
  return newDate;
};

// Retrieve attribute values and calculate the new date and time
const hourAttr = document.querySelector('[ms-code-time-hour]');
const minuteAttr = document.querySelector('[ms-code-time-minute]');
const secondAttr = document.querySelector('[ms-code-time-second]');
const millisecondAttr = document.querySelector('[ms-code-time-millisecond]');

const countdownDateTime = localStorage.getItem('countdownDateTime');
let newDate;

if (countdownDateTime) {
  newDate = new Date(countdownDateTime);
} else {
  newDate = currentDate;
  if (hourAttr.hasAttribute('ms-code-time-hour')) {
    const hours = parseInt(hourAttr.getAttribute('ms-code-time-hour'));
    newDate = addTime(newDate, 'hour', isNaN(hours) ? 0 : hours);
  }
  if (minuteAttr.hasAttribute('ms-code-time-minute')) {
    const minutes = parseInt(minuteAttr.getAttribute('ms-code-time-minute'));
    newDate = addTime(newDate, 'minute', isNaN(minutes) ? 0 : minutes);
  }
  if (secondAttr.hasAttribute('ms-code-time-second')) {
    const seconds = parseInt(secondAttr.getAttribute('ms-code-time-second'));
    newDate = addTime(newDate, 'second', isNaN(seconds) ? 0 : seconds);
  }
  if (millisecondAttr.hasAttribute('ms-code-time-millisecond')) {
    const milliseconds = parseInt(millisecondAttr.getAttribute('ms-code-time-millisecond'));
    newDate = addTime(newDate, 'millisecond', isNaN(milliseconds) ? 0 : milliseconds);
  }

  localStorage.setItem('countdownDateTime', newDate);
}

// Step 4: Update the text of the elements to show the continuous countdown
const countdownElements = [hourAttr, minuteAttr, secondAttr, millisecondAttr];

const updateCountdown = () => {
  const currentTime = new Date();
  const timeDifference = newDate - currentTime;

  if (timeDifference > 0) {
    const timeParts = [
      Math.floor(timeDifference / (1000 * 60 * 60)) % 24, // Hours
      Math.floor(timeDifference / (1000 * 60)) % 60, // Minutes
      Math.floor(timeDifference / 1000) % 60, // Seconds
      Math.floor(timeDifference) % 1000, // Milliseconds
    ];

    // Update the text of the elements with the countdown values
    countdownElements.forEach((element, index) => {
      const timeValue = timeParts[index];
      if (index === 3) {
        element.innerText = timeValue.toString().padStart(2, '0').slice(0, 2); // Display only two digits for milliseconds
      } else {
        element.innerText = timeValue < 10 ? `0${timeValue}` : timeValue;
      }
    });

    // Update the countdown every 10 milliseconds
    setTimeout(updateCountdown, 10);
  } else {
    // Countdown has reached zero or has passed
    countdownElements.forEach((element) => {
      element.innerText = '00';
    });

    // Remove elements with ms-code-countdown="hide-on-end" attribute
    const hideOnEndElements = document.querySelectorAll('[ms-code-countdown="hide-on-end"]');
    hideOnEndElements.forEach((element) => {
      element.remove();
    });

    // Optionally, you can perform additional actions or display a message when the countdown ends
  }
};

// Start the countdown
updateCountdown();
</script>