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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.calendar.util;

import com.google.ical.iter.RecurrenceIterator;
import com.google.ical.iter.RecurrenceIteratorFactory;
import com.google.ical.util.TimeUtils;
import com.google.ical.values.DateValue;
import com.google.ical.values.DateValueImpl;

import com.liferay.calendar.model.CalendarBooking;
import com.liferay.calendar.recurrence.PositionalWeekday;
import com.liferay.calendar.recurrence.Recurrence;
import com.liferay.calendar.recurrence.Weekday;
import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;

import java.text.ParseException;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import java.util.TimeZone;

/**
 * @author Marcellus Tavares
 */
public class RecurrenceUtil {

	public static List expandCalendarBooking(
		CalendarBooking calendarBooking, long startTime, long endTime,
		int maxSize) {

		List expandedCalendarBookings = new ArrayList<>();

		try {
			CalendarBookingIterator calendarBookingIterator =
				new CalendarBookingIterator(calendarBooking);

			while (calendarBookingIterator.hasNext()) {
				CalendarBooking newCalendarBooking =
					calendarBookingIterator.next();

				if (newCalendarBooking.getEndTime() < startTime) {
					continue;
				}

				if (newCalendarBooking.getStartTime() > endTime) {
					break;
				}

				expandedCalendarBookings.add(newCalendarBooking);

				if ((maxSize > 0) &&
					(expandedCalendarBookings.size() >= maxSize)) {

					break;
				}
			}
		}
		catch (ParseException pe) {
			_log.error("Unable to parse data ", pe);
		}

		return expandedCalendarBookings;
	}

	public static List expandCalendarBookings(
		List calendarBookings, long startTime, long endTime) {

		return expandCalendarBookings(calendarBookings, startTime, endTime, 0);
	}

	public static List expandCalendarBookings(
		List calendarBookings, long startTime, long endTime,
		int maxSize) {

		List expandedCalendarBookings = new ArrayList<>();

		for (CalendarBooking calendarBooking : calendarBookings) {
			List expandedCalendarBooking =
				expandCalendarBooking(
					calendarBooking, startTime, endTime, maxSize);

			expandedCalendarBookings.addAll(expandedCalendarBooking);
		}

		return expandedCalendarBookings;
	}

	public static CalendarBooking getCalendarBookingInstance(
		CalendarBooking calendarBooking, int instanceIndex) {

		try {
			CalendarBookingIterator calendarBookingIterator =
				new CalendarBookingIterator(calendarBooking);

			while (calendarBookingIterator.hasNext()) {
				CalendarBooking calendarBookingInstance =
					calendarBookingIterator.next();

				if (calendarBookingInstance.getInstanceIndex() ==
						instanceIndex) {

					return calendarBookingInstance;
				}
			}
		}
		catch (ParseException pe) {
			_log.error("Unable to parse data ", pe);
		}

		return null;
	}

	public static int getIndexOfInstance(
		String recurrence, long recurrenceStartTime, long instanceStartTime) {

		int count = 0;

		DateValue instanceDateValue = _toDateValue(instanceStartTime);

		try {
			RecurrenceIterator recurrenceIterator =
				RecurrenceIteratorFactory.createRecurrenceIterator(
					recurrence, _toDateValue(recurrenceStartTime),
					TimeUtils.utcTimezone());

			while (recurrenceIterator.hasNext()) {
				DateValue dateValue = recurrenceIterator.next();

				if (dateValue.compareTo(instanceDateValue) >= 0) {
					break;
				}

				count++;
			}
		}
		catch (ParseException pe) {
			_log.error("Unable to parse data ", pe);
		}

		return count;
	}

	public static Recurrence inTimeZone(
		Recurrence recurrence, Calendar startTimeJCalendar, TimeZone timeZone) {

		if (recurrence == null) {
			return null;
		}

		recurrence = recurrence.clone();

		List newExceptionJCalendars = new ArrayList<>();

		List exceptionJCalendars =
			recurrence.getExceptionJCalendars();

		for (Calendar exceptionJCalendar : exceptionJCalendars) {
			exceptionJCalendar = JCalendarUtil.getJCalendar(
				exceptionJCalendar, timeZone);

			newExceptionJCalendars.add(exceptionJCalendar);
		}

		recurrence.setExceptionJCalendars(newExceptionJCalendars);

		List newPositionalWeekdays = new ArrayList<>();

		List positionalWeekdays =
			recurrence.getPositionalWeekdays();

		for (PositionalWeekday positionalWeekday : positionalWeekdays) {
			Calendar jCalendar = JCalendarUtil.getJCalendar(
				startTimeJCalendar, recurrence.getTimeZone());

			Weekday weekday = positionalWeekday.getWeekday();

			jCalendar.set(Calendar.DAY_OF_WEEK, weekday.getCalendarWeekday());

			jCalendar = JCalendarUtil.getJCalendar(jCalendar, timeZone);

			weekday = Weekday.getWeekday(jCalendar);

			positionalWeekday = new PositionalWeekday(
				weekday, positionalWeekday.getPosition());

			newPositionalWeekdays.add(positionalWeekday);
		}

		recurrence.setPositionalWeekdays(newPositionalWeekdays);

		recurrence.setTimeZone(timeZone);

		Calendar untilJCalendar = recurrence.getUntilJCalendar();

		if (untilJCalendar != null) {
			untilJCalendar = JCalendarUtil.getJCalendar(
				recurrence.getUntilJCalendar(), timeZone);

			recurrence.setUntilJCalendar(untilJCalendar);
		}

		return recurrence;
	}

	private static DateValue _toDateValue(long time) {
		Calendar jCalendar = JCalendarUtil.getJCalendar(time);

		return new DateValueImpl(
			jCalendar.get(Calendar.YEAR), jCalendar.get(Calendar.MONTH) + 1,
			jCalendar.get(Calendar.DAY_OF_MONTH));
	}

	private static final Log _log = LogFactoryUtil.getLog(RecurrenceUtil.class);

}