import { Moment } from "moment-timezone";
import Holidays from "date-holidays";

const holidays = new Holidays()

export function countWorkingWeeksInRange(start: Moment, end: Moment) {
    const iterator = start.clone();

    let i = 0;
    while (iterator.isBefore(end)) {
        iterator.add(1, 'day');
        const holiday = holidays.isHoliday(iterator.toDate());

        const isHoliday = holiday && holiday.type == "public";
        const isWeekend = [6, 7].includes(iterator.isoWeekday())

        if (isHoliday || isWeekend) {
            continue;
        }

        i++;
    }

    return i;
}

export function computeWorkingHours(start: Moment, end: Moment, perDay: number = 8) {
    return countWorkingWeeksInRange(start, end) * perDay;
}