package com.kiasoft.util;

/* ------------------------------------------------------------------
 * Kiasoft, Inc.
 * http://kiasoft.com
 *
 * Copyright (c) 2004-2006 Kiasoft, Inc. 
 *
 * ------------------------------------------------------------------ */

/*
 * Date manipulation and testing
 */

import java.util.*;
import java.text.*;

// import org.apache.turbine.util.Log;


public class DateManip
{

	private Calendar cal;

	// 1 hour, 1 day in milliseconds
	private static long HOUR_MS = 3600000;
	private static long MINUTE_MS = ( HOUR_MS / 60 );
	private static long DAY_MS = ( 24 * HOUR_MS );
	private static long WEEK_MS = ( 7 * DAY_MS );

	public DateManip()
	{
		this.cal = Calendar.getInstance();
		return;
	}

	public void setDate( Date n )
	{
		this.cal.setTime( n );
	}

	public Date getDate()
	{
		return this.cal.getTime();
	}

	public Calendar getCalendar()
	{
		return this.cal;
	}


	public void addMinutes( int x )
	{
		this.cal.add(Calendar.MINUTE, x);
		return;
	}

	public void addHours( int x )
	{
		this.cal.add(Calendar.HOUR, x);
		return;
	}

	/*
	 * set to an exact hour
	 */
	public void setHour( int x )
	{
		this.cal.set(Calendar.HOUR_OF_DAY, x );
		this.cal.set(Calendar.MINUTE, 0 );
		this.cal.set(Calendar.SECOND, 0 );
	}

	public void addDays( int x )
	{
		this.cal.add(Calendar.DAY_OF_YEAR, x);
		return;
	}


	/*
	 * what is the day of the week
	 */
	public int getDayOfWeek()
	{
		return this.cal.get(Calendar.DAY_OF_WEEK);
	}


	/*
	 * routine to help get a date object which will match
	 * our pt notice
	 */
	public void setDateThisWeek( int dayOfWeek, int hour )
	{
		// reset to now
		Date now = new Date();
		this.setDate( now );

		// we know the day of week and the time, so
		// compose a new date object this week
		// that matches this data
		int today = this.getDayOfWeek();

		// figure out how many days to add to set the
		// correct day in the calendar
		if ( dayOfWeek < today )
		{
			// we need to get the date for next week on this day
			this.addDays( (  (dayOfWeek - today) + 7 ) );
		} else {
			// just figure out what day it is this week
			this.addDays( (dayOfWeek - today) );
		}

		this.setHour( hour );
		return;	
	}

	public void addWeeks( int x )
	{
		this.cal.add(Calendar.DAY_OF_YEAR, ( x * 7 ));
		return;
	}


	public boolean withinHour( Date start, Date end )
	{
		long diff = start.getTime() - end.getTime();
		if ( diff < 0 ) { diff = diff * (-1); }
		if ( diff <= HOUR_MS )
		{
			return true;
		} else {
			return false;
		}
	}

	public boolean withinDay( Date start, Date end )
	{
		long diff = start.getTime() - end.getTime();
		if ( diff < 0 ) { diff = diff * (-1); }
		if ( diff <= DAY_MS )
		{
			return true;
		} else {
			return false;
		}
	}

	public boolean withinWeek( Date start, Date end )
	{
		long diff = start.getTime() - end.getTime();
		if ( diff < 0 ) { diff = diff * (-1); }
		if ( diff <= WEEK_MS )
		{
			return true;
		} else {
			return false;
		}
	}

	// rounds to nearest whole number for week
	public int secondsToWeeks( long seconds )
	{
		long weeks = seconds / WEEK_MS;
		return Math.round( weeks );
	}


	/**
	 * parseCalObject() returns a date from
	 * our javascript calendar control input
	 * expecting MM/DD/YYYY
	 */
	public static Date parseCalObject( String cal )
	{
		// trime whitespace from input string
		cal.trim();
		try
		{
			DateFormat df = DateFormat.getDateInstance( DateFormat.SHORT );
			if ( cal != null && !cal.equals("") && !cal.equals(" ") )
			{
				return df.parse( cal );
			} else {
				return null;
			}

		} catch ( Exception e ) {
			// Log.error("DateManip parseCalObject error: " + e.toString() );
			return null;
		}
	}

}