estimateProgress.js

// progress in 0..1 range, time is epoch seconda
function estimateProgressRemainTime(progressLast, timeLast, progressCurrent, timeCurrent) {
    // Calculate the time taken for the progress made
    const timeTaken = timeCurrent - timeLast; // time in seconds
    const progressMade = progressCurrent - progressLast;

    // Avoid division by zero or negative progress
    if (progressMade <= 0) {
        return "No progress made or invalid input.";
    }

    // Calculate the remaining time
    const speed = timeTaken/(progressMade*100);
    const remainProgress = 1-progressCurrent;
    return speed*remainProgress*100;
}

// Tests
test('remainTime', () => {
  const timeCurrent = Date.now() / 1000;
  const timeLast = timeCurrent - 2;
  const lastProgress = 0.25;
  const currentProgress = 0.5;

  // Было 25% секунды 2 назад, сейчас 50%, через сколько секунд будет 100%
  const estimateTime = estimateProgressRemainTime(lastProgress, timeLast, currentProgress, timeCurrent)

  console.log(estimateTime)
  expect(estimateTime).toBe(4);
});
test('remainTime2', () => {
  const timeCurrent = Date.now() / 1000;
  const timeLast = timeCurrent - 2;
  const lastProgress = 0.2;
  const currentProgress = 0.4;
  // Было 20% секунды 2 назад, сейчас 40%, через сколько секунд будет 100%
  const estimateTime = estimateProgressRemainTime(lastProgress, timeLast, currentProgress, timeCurrent)

  console.log(estimateTime)
  expect(estimateTime).toBe(6);
});