/*****************************************************************************
 * Copyright (c) 2019 CEA LIST.
 *
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *  CEA LIST - Initial API and implementation
 *
 *****************************************************************************/
package org.eclipse.papyrus.ease.fmi;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.eclipse.gmf.runtime.notation.Node;
import org.eclipse.papyrus.moka.fmi.fmiprofile.CS_FMU;
import org.eclipse.papyrus.moka.ssp.omsimulatorprofile.BusConnector;
import org.eclipse.papyrus.moka.ssp.omsimulatorprofile.util.OMSimulatorProfileUtil;
import org.eclipse.uml2.uml.AggregationKind;
import org.eclipse.uml2.uml.Class;
import org.eclipse.uml2.uml.Connector;
import org.eclipse.uml2.uml.ConnectorEnd;
import org.eclipse.uml2.uml.NamedElement;
import org.eclipse.uml2.uml.Port;
import org.eclipse.uml2.uml.Property;
import org.eclipse.uml2.uml.Stereotype;
import org.eclipse.uml2.uml.util.UMLUtil;

public class FMISimulatorHandler extends GraphicalElement {

	private Class simClass;

	private Map<String, FMUInstanceHandler> instanceMap = new HashMap<>();
	private List<AbstractConnectorHandler> connectorHandlers = new ArrayList<>();

	
	public FMISimulatorHandler(Class simulatorClass) {
		super(simulatorClass);
		simClass = simulatorClass;
		for (Property prop : simClass.getAllAttributes()) {
			CS_FMU fmu = UMLUtil.getStereotypeApplication(prop.getType(), CS_FMU.class);
			if (fmu != null) {
				instanceMap.put(prop.getName(), new FMUInstanceHandler(this, prop));
			}
		}
		for (Connector connector : simClass.getOwnedConnectors()) {
			if (UMLUtil.getStereotypeApplication(connector, BusConnector.class) != null) {
				connectorHandlers.add(new BusConnectorHandler(this, connector));
			} else {
				connectorHandlers.add(new ConnectorHandler(this, connector));
			}

		}

	}

	
	public Class getUMLClass() {
		return simClass;
	}
	public Collection<FMUInstanceHandler> getInstances() {
		return instanceMap.values();
	}

	public List<AbstractConnectorHandler> getConnectors() {
		return connectorHandlers;
	}

	public String getName() {
		return simClass.getName();
	}

	public FMUInstanceHandler instantiateFMU(String fmuQN, String instanceName) {
		Collection<NamedElement> fmuTypes = UMLUtil.findNamedElements(simClass.eResource().getResourceSet(), fmuQN);
		Class fmuType = null;
		FMUInstanceHandler result = null;
		for (NamedElement namedElem : fmuTypes) {
			if (namedElem instanceof Class && UMLUtil.getStereotypeApplication(namedElem, CS_FMU.class) != null) {
				fmuType = (Class) namedElem;
			}
		}

		if (fmuType != null) {
			Property fmuProp = simClass.createOwnedAttribute(instanceName, fmuType);
			fmuProp.setAggregation(AggregationKind.COMPOSITE_LITERAL);
			result = new FMUInstanceHandler(this, fmuProp);
			instanceMap.put(instanceName, result);

		} else {
			throw new RuntimeException("Failed to find FMU type " + fmuQN);

		}

		return result;

	}
	
	public FMUInstanceHandler instantiateFMU(String fmuQN, String instanceName, int x, int y, List<Port> portsToHide) {
		FMUInstanceHandler handler = instantiateFMU(fmuQN, instanceName);
		handler.createView(x, y, portsToHide);
		return handler;
	}

	public ConnectorHandler addConnection(String sourcePort, String targetPort) {
		Connector connector = createUMLConnector(sourcePort, targetPort);
		ConnectorHandler result = new ConnectorHandler(this, connector);
		return result;

	}
	
	public ConnectorHandler addConnection(String sourcePort, String targetPort, boolean createView) {
		ConnectorHandler result = addConnection(sourcePort, targetPort);
		if (createView) {
			result.createView();
		}
		return result;
	}

	public BusConnectorHandler addBusConnection(String sourceBus, String targetBus) {

		Connector connector = createUMLConnector(sourceBus, targetBus);
		connector.applyStereotype((Stereotype) connector.eResource().getResourceSet()
				.getEObject(OMSimulatorProfileUtil.OMSIMULATOR_BUS_CONNECTOR_URI, true));
		BusConnectorHandler result = new BusConnectorHandler(this, connector);
		return result;
	}
	
	public BusConnectorHandler addBusConnection(String sourceBus, String targetBus, boolean createView) {
		BusConnectorHandler result = addBusConnection(sourceBus, targetBus);
		if (createView) {
			result.createView();
		}
		return result;
	}

	protected Connector createUMLConnector(String sourcePort, String targetPort) {
		AbstractPortHandler sourcePortHandler = getInstancePort(sourcePort);
		AbstractPortHandler targetPortHandler = getInstancePort(targetPort);

		if (sourcePortHandler != null && targetPortHandler != null) {
			Connector connector = simClass.createOwnedConnector(sourcePort + "_" + targetPort);
			ConnectorEnd sourceEnd = connector.createEnd();
			sourceEnd.setPartWithPort(sourcePortHandler.getUMLPart());
			sourceEnd.setRole(sourcePortHandler.getUMLPort());

			ConnectorEnd targetEnd = connector.createEnd();
			targetEnd.setPartWithPort(targetPortHandler.getUMLPart());
			targetEnd.setRole(targetPortHandler.getUMLPort());

			return connector;

		}
		System.out.println("ERROR: Failed to create connector between " + sourcePort + " and " + targetPort);
		throw new RuntimeException("Failed to create connector between " + sourcePort + " and " + targetPort);
	}

	public AbstractPortHandler getInstancePort(String portName) {

		int dotIndex = portName.indexOf(':');
		if (dotIndex == -1) {
			throw new RuntimeException("Invalid instance portName " + portName);
		}

		String instanceName = portName.substring(0, dotIndex);

		FMUInstanceHandler instance = getInstance(instanceName);
		if (instance != null) {

			AbstractPortHandler result = instance.getPortOrBus(portName.substring(dotIndex + 1));
			if (result != null) {
				return result;
			}

		}
		return null;

	}

	public FMUInstanceHandler getInstance(String instanceName) {
		FMUInstanceHandler result = instanceMap.get(instanceName);
		if (result == null) {
			// name may have changed, we re-init the map;
			updateInstanceMap();
			result = instanceMap.get(instanceName);
			if (result == null) {
				System.out.println("Could not find instance " + instanceName);
				throw new RuntimeException("Could not find instance " + instanceName);
			}
		}
		return result;

	}

	protected void updateInstanceMap() {
		List<FMUInstanceHandler> instances = new ArrayList<>(instanceMap.values());
		instanceMap.clear();
		for (FMUInstanceHandler instance : instances) {
			instanceMap.put(instance.getName(), instance);
		}
	}
	
	
	public List<IConnectorHandler> getFlattenedConnectors(){
		List<IConnectorHandler> result = new ArrayList<>();
		
		for (AbstractConnectorHandler busOrSimpleConnector : connectorHandlers) {
			if( busOrSimpleConnector instanceof BusConnectorHandler) {
				result.addAll(((BusConnectorHandler) busOrSimpleConnector).getSubConnections());
			}else {
				result.add(busOrSimpleConnector);
			}
		}
		return result;
	}

}