/**
 *                                                                            
 * Copyright (c) 2011, 2016 - Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
 *                                                                            
 * 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:   
 * Christophe Loetz (Loetz GmbH&Co.KG) - initial implementation 
 */
package org.eclipse.osbp.xtext.functionlibrary.common.uomo;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Set;

import org.eclipse.uomo.units.AbstractSystemOfUnits;
import org.eclipse.uomo.units.impl.BaseAmount;
import org.unitsofmeasurement.quantity.Quantity;
import org.unitsofmeasurement.unit.Unit;


/**
 * All available systems of units <code>ISystemOfQuantityUnits</code>, combining SystemOfMetrics and Quantity.<br>
 * @see {@link http://www.ptb.de/cms/fileadmin/internet/publikationen/Einheiten_deutsch.pdf}
 */
public class SystemsOfQuantityUnits {

	public final static MetricLengthUnit METRIC_LENGTH_UNIT = MetricLengthUnit.getInstance();
	public final static MetricAreaUnit METRIC_AREA_UNIT = MetricAreaUnit.getInstance();
	public final static MetricVolumeUnit METRIC_VOLUME_UNIT = MetricVolumeUnit.getInstance();
	public final static MetricMassUnit METRIC_MASS_UNIT = MetricMassUnit.getInstance();
	public final static ImperialLengthUnit IMPERIAL_LENGTH_UNIT = ImperialLengthUnit.getInstance();

	private final static ArrayList<ISystemOfQuantityUnits<?,?>> sSystemsOfQuantityUnits = new ArrayList<ISystemOfQuantityUnits<?,?>> ();
	
	static {
		sSystemsOfQuantityUnits.add(METRIC_LENGTH_UNIT);
		sSystemsOfQuantityUnits.add(METRIC_AREA_UNIT);
		sSystemsOfQuantityUnits.add(METRIC_VOLUME_UNIT);
		sSystemsOfQuantityUnits.add(METRIC_MASS_UNIT);
		sSystemsOfQuantityUnits.add(IMPERIAL_LENGTH_UNIT);
	}

//	public static BaseAmount<?> amount(Number number, Unit unit) {
//		if	(unit instanceof Unit<Length>) {
//		}
//		else {
//			return null;
//		}
//	}
	
	/**
	 * @return set of all available quantities
	 */
	public static Set<Class<?>> getQuantities() {
		HashSet<Class<?>> retcode = new HashSet<Class<?>>();
		for	(ISystemOfQuantityUnits<?,?> unit : sSystemsOfQuantityUnits) {
			retcode.add(unit.getQuantityClass());
		}
		return retcode;
	}
	
	/**
	 * @return set of all available system of quantity units
	 */
	public static Set<ISystemOfQuantityUnits<?,?>> elements() {
		return new HashSet<ISystemOfQuantityUnits<?,?>>(sSystemsOfQuantityUnits);
	}

	/**
	 * @param systemOfUnits
	 * @param quantity
	 * @return set of all available system of quantity units available for systemOfUnits and quantity
	 */
	public static ArrayList<ISystemOfQuantityUnits<?,?>> elements(Class<AbstractSystemOfUnits> systemOfUnits, Class<Quantity<?>> quantity) {
		ArrayList<ISystemOfQuantityUnits<?,?>> retcode = new ArrayList<ISystemOfQuantityUnits<?,?>>();
		for	(ISystemOfQuantityUnits<?,?> unit : sSystemsOfQuantityUnits) {
			if	(unit.handles(systemOfUnits) && unit.handles(quantity)) {
				retcode.add(unit);
			}
		}
		return retcode;
	}

	/**
	 * @param findUnit
	 * @return set of all available system of quantity units compatible to findUnit
	 */
	public static ArrayList<ISystemOfQuantityUnits<?,?>> elements(BaseAmount<?> amount) {
		return elements(amount.unit());
	}

	/**
	 * @param findUnit
	 * @return set of all available system of quantity units compatible to findUnit
	 */
	public static ArrayList<ISystemOfQuantityUnits<?,?>> elements(Unit<?> findUnit) {
		ArrayList<ISystemOfQuantityUnits<?,?>> retcode = new ArrayList<ISystemOfQuantityUnits<?,?>>();
		for	(ISystemOfQuantityUnits<?,?> unit : sSystemsOfQuantityUnits) {
			if	(unit.getUnits().iterator().next().isCompatible(findUnit)) {
				retcode.add(unit);
			}
		}
		return retcode;
	}

	/**
	 * @param systemOfUnitsOrQuantity
	 * @return set of all available system of quantity units available for systemOfUnits or quantity
	 */
	public static ArrayList<ISystemOfQuantityUnits<?,?>> elements(Class<?> systemOfUnitsOrQuantity) {
		ArrayList<ISystemOfQuantityUnits<?,?>> retcode = new ArrayList<ISystemOfQuantityUnits<?,?>>();
		for	(ISystemOfQuantityUnits<?,?> unit : sSystemsOfQuantityUnits) {
			if	(unit.handles(systemOfUnitsOrQuantity)) {
				retcode.add(unit);
			}
		}
		return retcode;
	}
}