react-native-taqweem/lib/module/hooks.js

**A dual calendar component (Hijri + Gregorian) for React Native** — minimal, customizable, and theme-ready. Perfect for apps needing culturally-aware calendars, Islamic date pickers, or just modern UX flexibility.

"use strict";

import { useMemo } from 'react';
import { getCurrentMonth, getCurrentYear, getNextMonth, getNumberOfDaysInMonth, getPreviousMonth, setDayOfMonth } from "./utils.js";
import moment from 'moment-hijri';
export const useCalendarInfo = (isHijri, dateObj) => {
  const year = getCurrentYear(isHijri, dateObj);
  const month = getCurrentMonth(isHijri, dateObj);
  const daysInMonth = getNumberOfDaysInMonth(isHijri, dateObj);
  return {
    year,
    month,
    daysInMonth
  };
};
export const useCalendarDays = (isHijri, year, month, daysInMonth, showAdjacentMonths) => {
  return useMemo(() => {
    const startOfCurrentMonth = isHijri ? moment(`${year}-${month + 1}-1`, 'iYYYY-iM-iD') : moment(`${year}-${month + 1}-1`, 'YYYY-M-D');
    const firstDayWeekDayOfMonth = startOfCurrentMonth.day();
    const currentMonthDates = Array.from({
      length: daysInMonth
    }, (_, i) => {
      const day = i + 1;
      const date = startOfCurrentMonth.clone();
      const dateObj = setDayOfMonth(date, day, isHijri);
      return {
        label: day.toString(),
        date: dateObj,
        isCurrentMonth: true
      };
    });
    if (!showAdjacentMonths) {
      const totalCells = 42;
      const blanksBefore = Array(firstDayWeekDayOfMonth).fill(null);
      const blanksAfter = Array(totalCells - blanksBefore.length - currentMonthDates.length).fill(null);
      return [...blanksBefore.map(() => null), ...currentMonthDates, ...blanksAfter.map(() => null)];
    }
    const prevMonth = getPreviousMonth(isHijri, startOfCurrentMonth.clone());
    const prevMonthDays = getNumberOfDaysInMonth(isHijri, prevMonth);
    const prevMonthDates = Array.from({
      length: firstDayWeekDayOfMonth
    }, (_, i) => {
      const day = prevMonthDays - firstDayWeekDayOfMonth + i + 1;
      const date = prevMonth.clone();
      const dateObj = setDayOfMonth(date, day, isHijri);
      return {
        label: day.toString(),
        date: dateObj,
        isCurrentMonth: false
      };
    });
    const totalCells = 42;
    const nextDaysNeeded = totalCells - (prevMonthDates.length + currentMonthDates.length);
    const nextMonth = getNextMonth(isHijri, startOfCurrentMonth.clone());
    const nextMonthDates = Array.from({
      length: nextDaysNeeded
    }, (_, i) => {
      const day = i + 1;
      const date = nextMonth.clone();
      const dateObj = setDayOfMonth(date, day, isHijri);
      return {
        label: day.toString(),
        date: dateObj,
        isCurrentMonth: false
      };
    });
    return [...prevMonthDates, ...currentMonthDates, ...nextMonthDates];
  }, [isHijri, year, month, daysInMonth, showAdjacentMonths]);
};
export const useWeekdays = (lang = 'en') => {
  return useMemo(() => {
    const formatter = new Intl.DateTimeFormat(lang, {
      weekday: 'short'
    });

    // Starting from Sunday (0) to Saturday (6)
    const baseDate = new Date(Date.UTC(2023, 9, 1)); // Any Sunday

    return Array.from({
      length: 7
    }, (_, i) => {
      const date = new Date(baseDate);
      date.setDate(baseDate.getDate() + i); // Increment day
      return formatter.format(date);
    });
  }, [lang]);
};
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