booking.md

‎‎​

booking.ts

type Booking = {
  start: string;
  end: string;
};

const booking: Booking[] = [
  { start: '2024-05-04T13:00:00.000Z', end: '2024-05-04T14:00:00.000Z' },
  { start: '2024-05-04T15:00:00.000Z', end: '2024-05-04T16:00:00.000Z' },
  { start: '2024-05-04T17:00:00.000Z', end: '2024-05-04T18:00:00.000Z' },
];

function availableSlot(booking: Booking[], interval: number, gap: number) {
  booking.sort(
    (a, b) => new Date(a.start).getTime() - new Date(b.start).getTime()
  );

  let startTime = '2024-05-04T00:00:00.000Z',
    endTime = booking[0].start;

  const available = [] as Booking[];

  for (let item = 0; item <= booking.length; item++) {
    const currentBooking = booking[item];
    const gapResult = gapTime(startTime, endTime, interval, gap);
    available.push(...gapResult);

    startTime = currentBooking?.end ?? booking[item - 1];
    endTime = booking[item + 1]?.start ?? '2024-05-04T23:00:00.000Z';
  }

  return available;
}

function gapTime(
  startTime: string,
  endTime: string,
  interval: number,
  gap: number
): Booking[] {
  const result = [] as Booking[];
  let start = new Date(startTime);
  let end = new Date(endTime);
  while (start < end) {
    //console.log(next);
    let next = new Date(start.getTime() + interval * 60 * 60 * 1000);
    if (next <= end) {
      result.push({
        start: new Date(start.getTime() + gap * 60 * 1000).toISOString(),
        end: new Date(next.getTime() - gap * 60 * 1000).toISOString(),
      });
    }

    start = next;
  }

  return result;
}

const slot = availableSlot(booking, 1, 10);
console.log(slot);