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 * See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package hr.fer.zemris.vhdllab.applets.editor.schema2.model.parameters.events;

import hr.fer.zemris.vhdllab.applets.editor.schema2.enums.EPropertyChange;
import hr.fer.zemris.vhdllab.applets.editor.schema2.interfaces.IParameter;
import hr.fer.zemris.vhdllab.applets.editor.schema2.interfaces.IParameterEvent;
import hr.fer.zemris.vhdllab.applets.editor.schema2.interfaces.ISchemaComponent;
import hr.fer.zemris.vhdllab.applets.editor.schema2.interfaces.ISchemaInfo;
import hr.fer.zemris.vhdllab.applets.editor.schema2.interfaces.ISchemaWire;
import hr.fer.zemris.vhdllab.applets.editor.schema2.misc.ChangeTuple;
import hr.fer.zemris.vhdllab.service.ci.Port;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;






/**
 * Uzima prvi port komponente kojoj pripada
 * i mijenja mu velicinu na zadanu.
 * Ovaj event nije undoable.
 * 
 * @author brijest
 *
 */
public class FirstPortResizer implements IParameterEvent {
	
	/* static fields */
	private static final List<ChangeTuple> changes = new ArrayList<ChangeTuple>();
	private static final List<ChangeTuple> ro_ch = Collections.unmodifiableList(changes);
	static {
		changes.add(new ChangeTuple(EPropertyChange.CANVAS_CHANGE));
	}
	

	/* private fields */
	
	

	/* ctors */
	
	public FirstPortResizer() {
	}
	
	
	
	

	/* methods */

	public IParameterEvent copyCtor() {
		return new FirstPortResizer();
	}

	public List<ChangeTuple> getChanges() {
		return ro_ch;
	}

	public boolean isUndoable() {
		return false;
	}
	
	public boolean performChange(Object oldvalue, IParameter parameter, ISchemaInfo info,
			ISchemaWire wire, ISchemaComponent component)
	{
		if (component == null) return false;
		
		int oldnum = (Integer)oldvalue, portnum;
		
		try {
			portnum = parameter.getValueAsInteger();
		} catch (ClassCastException e) {
			return false;
		}
		
		if (oldnum == portnum) return true;
		if (portnum <= 0) return false;
		
		Port port = null;
		try {
			port = component.getPort(0);
		} catch (IndexOutOfBoundsException e) {
			return false;
		}
		
		// create new port of same type but new size
		if (port.isScalar()) return false;
		int[] range = new int[2];
		range[0] = port.getFrom() + (portnum - oldnum) * ((port.isTO()) ? (0) : (1));
		range[1] = port.getTo() + (portnum - oldnum) * ((port.isTO()) ? (1) : (0));
		port = new Port(port);
		port.setFrom(range[0]);
		port.setTo(range[1]);
		component.setPort(0, port);
		
		return true;
	}
}