/*******************************************************************************
 * Copyright (c) 2011 The University of York.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Louis Rose - initial API and implementation
 ******************************************************************************/
package simulator.execution.model;

import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;

import simulator.scl.TimeConstant;
import simulator.scl.UnitOfTime;

public class Time implements Serializable {

	// Generated by Eclipse
	private static final long serialVersionUID = -9013160136000644203L;
	
	private final Date value;

	public static Time now() {
		return new Time(new Date());
	}
	
	public static Time hoursAgo(int numberOfHours) {
		return now().add(Calendar.HOUR, -numberOfHours);
	}
	
	public Time(TimeConstant constant) {
		this(DateUtils.todayAt(constant.getHours(), constant.getMinutes()));
	}
	
	private Time(Date value) {
		this.value = value;
	}

	public String formatWith(TimeFormatter formatter) {
		return formatter.format(value);
	}

	public Time increment(UnitOfTime unit) {
		final int calendarUnit = unit == UnitOfTime.HOUR ? Calendar.HOUR : Calendar.MINUTE;
		final int step = 1;
		return add(calendarUnit, step);
	}

	private Time add(final int calendarUnit, final int step) {
		return new Time(DateUtils.add(value, calendarUnit, step));
	}
	
	public boolean sameDateAs(Time other) {
		return DateUtils.sameDate(value, other.value);
	}
	
	@Override
	public boolean equals(Object o) {
		if (!(o instanceof Time))
			return false;
		
		final Time other = (Time)o;
		
		return this.value.equals(other.value);
	}
	
	@Override
	public int hashCode() {
		return value.hashCode();
	}
	
	@Override
	public String toString() {
		return value.toString();
	}
}