/*
GanttProject is an opensource project management tool.
Copyright (C) 2004-2011 GanttProject Team

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 3
of the License, or (at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package biz.ganttproject.core.calendar;

import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.List;

import biz.ganttproject.core.time.TimeDuration;
import biz.ganttproject.core.time.TimeUnit;


/**
 * @author bard
 */
public class AlwaysWorkingTimeCalendarImpl extends GPCalendarBase implements GPCalendarCalc {
  @Override
  public List<GPCalendarActivity> getActivities(Date startDate, Date endDate) {
    return Collections.singletonList((GPCalendarActivity) new CalendarActivityImpl(startDate, endDate, true));
  }

  @Override
  protected List<GPCalendarActivity> getActivitiesForward(Date startDate, TimeUnit timeUnit, long unitCount) {
    Date activityStart = timeUnit.adjustLeft(startDate);
    Date activityEnd = activityStart;
    while (unitCount-- > 0) {
      activityEnd = timeUnit.adjustRight(activityEnd);
    }
    return Collections.singletonList((GPCalendarActivity) new CalendarActivityImpl(activityStart, activityEnd, true));
  }

  @Override
  protected List<GPCalendarActivity> getActivitiesBackward(Date startDate, TimeUnit timeUnit, long unitCount) {
    Date activityEnd = timeUnit.adjustLeft(startDate);
    Date activityStart = activityEnd;
    while (unitCount-- > 0) {
      activityStart = timeUnit.jumpLeft(activityStart);
    }
    return Collections.singletonList((GPCalendarActivity) new CalendarActivityImpl(activityStart, activityEnd, true));
  }

  @Override
  public void setWeekDayType(int day, DayType type) {
    if (type == GPCalendar.DayType.WEEKEND) {
      throw new IllegalArgumentException("I am always working time calendar, I don't accept holidays!");
    }
  }

  @Override
  public DayType getWeekDayType(int day) {
    // Every day is a working day...
    return GPCalendar.DayType.WORKING;
  }

  @Override
  public int getDayMask(Date date) {
    return GPCalendar.DayMask.WORKING;
  }

  @Override
  public CalendarEvent getEvent(Date date) {
    return null;
  }

  @Override
  public Date findClosestWorkingTime(Date date) {
    // No days off, so given date is good
    return date;
  }

//  @Override
//  public boolean isNonWorkingDay(Date curDayStart) {
//    // Always return false, as this calendar only has working days
//    return false;
//  }

  @Override
  public boolean getOnlyShowWeekends() {
    // Weekends are always working days for this calendar
    return true;
  }

  @Override
  public void setOnlyShowWeekends(boolean onlyShowWeekends) {
    // Ignore onlyShowWeekends, since weekends are always
    // working days for this calendar
  }

  @Override
  public Collection<CalendarEvent> getPublicHolidays() {
    // Return an empty collection, as there are no holidays in this calendar
    return Collections.emptyList();
  }

  @Override
  public List<GPCalendarActivity> getActivities(Date startingFrom, TimeDuration period) {
    return getActivities(startingFrom, period.getTimeUnit(), period.getLength());
  }

  @Override
  public GPCalendarCalc copy() {
    return new AlwaysWorkingTimeCalendarImpl();
  }

  @Override
  public void setPublicHolidays(Collection<CalendarEvent> holidays) {
  }

  @Override
  public String getBaseCalendarID() {
    return null;
  }

  @Override
  public void setBaseCalendarID(String id) {
  }

  @Override  
  public void importCalendar(GPCalendar calendar, ImportCalendarOption importOption) {
  }
}