package com.opcoach.training.rental.diagram.edit.policies;

import java.util.Iterator;

import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.gef.Request;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.UnexecutableCommand;
import org.eclipse.gef.requests.ReconnectRequest;
import org.eclipse.gmf.runtime.common.core.command.ICommand;
import org.eclipse.gmf.runtime.common.core.command.ICompositeCommand;
import org.eclipse.gmf.runtime.diagram.core.commands.DeleteCommand;
import org.eclipse.gmf.runtime.diagram.ui.commands.CommandProxy;
import org.eclipse.gmf.runtime.diagram.ui.commands.ICommandProxy;
import org.eclipse.gmf.runtime.diagram.ui.editparts.IGraphicalEditPart;
import org.eclipse.gmf.runtime.diagram.ui.editpolicies.SemanticEditPolicy;
import org.eclipse.gmf.runtime.emf.commands.core.command.CompositeTransactionalCommand;
import org.eclipse.gmf.runtime.emf.type.core.IElementType;
import org.eclipse.gmf.runtime.emf.type.core.requests.ConfigureRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.CreateElementRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.CreateRelationshipRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.DestroyElementRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.DestroyReferenceRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.DestroyRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.DuplicateElementsRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.GetEditContextRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.IEditCommandRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.MoveRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.ReorientReferenceRelationshipRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.ReorientRelationshipRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.SetRequest;
import org.eclipse.gmf.runtime.notation.View;

import com.opcoach.training.rental.Customer;
import com.opcoach.training.rental.Rental;
import com.opcoach.training.rental.RentalObject;
import com.opcoach.training.rental.diagram.edit.helpers.RentalBaseEditHelper;
import com.opcoach.training.rental.diagram.part.RentalDiagramEditorPlugin;
import com.opcoach.training.rental.diagram.part.RentalVisualIDRegistry;
import com.opcoach.training.rental.diagram.providers.RentalElementTypes;

/**
 * @generated
 */
public class RentalBaseItemSemanticEditPolicy extends SemanticEditPolicy
{

	/**
	 * Extended request data key to hold editpart visual id.
	 * @generated
	 */
	public static final String VISUAL_ID_KEY = "visual_id"; //$NON-NLS-1$

	/**
	 * @generated
	 */
	private final IElementType myElementType;

	/**
	 * @generated
	 */
	protected RentalBaseItemSemanticEditPolicy(IElementType elementType)
	{
		myElementType = elementType;
	}

	/**
	 * Extended request data key to hold editpart visual id.
	 * Add visual id of edited editpart to extended data of the request
	 * so command switch can decide what kind of diagram element is being edited.
	 * It is done in those cases when it's not possible to deduce diagram
	 * element kind from domain element.
	 * 
	 * @generated
	 */
	public Command getCommand(Request request)
	{
		if (request instanceof ReconnectRequest)
		{
			Object view = ((ReconnectRequest) request).getConnectionEditPart().getModel();
			if (view instanceof View)
			{
				Integer id = new Integer(RentalVisualIDRegistry.getVisualID((View) view));
				request.getExtendedData().put(VISUAL_ID_KEY, id);
			}
		}
		return super.getCommand(request);
	}

	/**
	 * Returns visual id from request parameters.
	 * @generated
	 */
	protected int getVisualID(IEditCommandRequest request)
	{
		Object id = request.getParameter(VISUAL_ID_KEY);
		return id instanceof Integer ? ((Integer) id).intValue() : -1;
	}

	/**
	 * @generated
	 */
	protected Command getSemanticCommand(IEditCommandRequest request)
	{
		IEditCommandRequest completedRequest = completeRequest(request);
		Command semanticCommand = getSemanticCommandSwitch(completedRequest);
		semanticCommand = getEditHelperCommand(completedRequest, semanticCommand);
		if (completedRequest instanceof DestroyRequest)
		{
			DestroyRequest destroyRequest = (DestroyRequest) completedRequest;
			return shouldProceed(destroyRequest) ? addDeleteViewCommand(semanticCommand, destroyRequest) : null;
		}
		return semanticCommand;
	}

	/**
	 * @generated
	 */
	protected Command addDeleteViewCommand(Command mainCommand, DestroyRequest completedRequest)
	{
		Command deleteViewCommand = getGEFWrapper(new DeleteCommand(getEditingDomain(), (View) getHost().getModel()));
		return mainCommand == null ? deleteViewCommand : mainCommand.chain(deleteViewCommand);
	}

	/**
	 * @generated
	 */
	private Command getEditHelperCommand(IEditCommandRequest request, Command editPolicyCommand)
	{
		if (editPolicyCommand != null)
		{
			ICommand command = editPolicyCommand instanceof ICommandProxy ? ((ICommandProxy) editPolicyCommand).getICommand()
					: new CommandProxy(editPolicyCommand);
			request.setParameter(RentalBaseEditHelper.EDIT_POLICY_COMMAND, command);
		}
		IElementType requestContextElementType = getContextElementType(request);
		request.setParameter(RentalBaseEditHelper.CONTEXT_ELEMENT_TYPE, requestContextElementType);
		ICommand command = requestContextElementType.getEditCommand(request);
		request.setParameter(RentalBaseEditHelper.EDIT_POLICY_COMMAND, null);
		request.setParameter(RentalBaseEditHelper.CONTEXT_ELEMENT_TYPE, null);
		if (command != null)
		{
			if (!(command instanceof CompositeTransactionalCommand))
			{
				command = new CompositeTransactionalCommand(getEditingDomain(), command.getLabel()).compose(command);
			}
			return new ICommandProxy(command);
		}
		return editPolicyCommand;
	}

	/**
	 * @generated
	 */
	private IElementType getContextElementType(IEditCommandRequest request)
	{
		IElementType requestContextElementType = RentalElementTypes.getElementType(getVisualID(request));
		return requestContextElementType != null ? requestContextElementType : myElementType;
	}

	/**
	 * @generated
	 */
	protected Command getSemanticCommandSwitch(IEditCommandRequest req)
	{
		if (req instanceof CreateRelationshipRequest)
		{
			return getCreateRelationshipCommand((CreateRelationshipRequest) req);
		} else if (req instanceof CreateElementRequest)
		{
			return getCreateCommand((CreateElementRequest) req);
		} else if (req instanceof ConfigureRequest)
		{
			return getConfigureCommand((ConfigureRequest) req);
		} else if (req instanceof DestroyElementRequest)
		{
			return getDestroyElementCommand((DestroyElementRequest) req);
		} else if (req instanceof DestroyReferenceRequest)
		{
			return getDestroyReferenceCommand((DestroyReferenceRequest) req);
		} else if (req instanceof DuplicateElementsRequest)
		{
			return getDuplicateCommand((DuplicateElementsRequest) req);
		} else if (req instanceof GetEditContextRequest)
		{
			return getEditContextCommand((GetEditContextRequest) req);
		} else if (req instanceof MoveRequest)
		{
			return getMoveCommand((MoveRequest) req);
		} else if (req instanceof ReorientReferenceRelationshipRequest)
		{
			return getReorientReferenceRelationshipCommand((ReorientReferenceRelationshipRequest) req);
		} else if (req instanceof ReorientRelationshipRequest)
		{
			return getReorientRelationshipCommand((ReorientRelationshipRequest) req);
		} else if (req instanceof SetRequest)
		{
			return getSetCommand((SetRequest) req);
		}
		return null;
	}

	/**
	 * @generated
	 */
	protected Command getConfigureCommand(ConfigureRequest req)
	{
		return null;
	}

	/**
	 * @generated
	 */
	protected Command getCreateRelationshipCommand(CreateRelationshipRequest req)
	{
		return null;
	}

	/**
	 * @generated
	 */
	protected Command getCreateCommand(CreateElementRequest req)
	{
		return null;
	}

	/**
	 * @generated
	 */
	protected Command getSetCommand(SetRequest req)
	{
		return null;
	}

	/**
	 * @generated
	 */
	protected Command getEditContextCommand(GetEditContextRequest req)
	{
		return null;
	}

	/**
	 * @generated
	 */
	protected Command getDestroyElementCommand(DestroyElementRequest req)
	{
		return null;
	}

	/**
	 * @generated
	 */
	protected Command getDestroyReferenceCommand(DestroyReferenceRequest req)
	{
		return null;
	}

	/**
	 * @generated
	 */
	protected Command getDuplicateCommand(DuplicateElementsRequest req)
	{
		return null;
	}

	/**
	 * @generated
	 */
	protected Command getMoveCommand(MoveRequest req)
	{
		return null;
	}

	/**
	 * @generated
	 */
	protected Command getReorientReferenceRelationshipCommand(ReorientReferenceRelationshipRequest req)
	{
		return UnexecutableCommand.INSTANCE;
	}

	/**
	 * @generated
	 */
	protected Command getReorientRelationshipCommand(ReorientRelationshipRequest req)
	{
		return UnexecutableCommand.INSTANCE;
	}

	/**
	 * @generated
	 */
	protected final Command getGEFWrapper(ICommand cmd)
	{
		return new ICommandProxy(cmd);
	}

	/**
	 * Returns editing domain from the host edit part.
	 * @generated
	 */
	protected TransactionalEditingDomain getEditingDomain()
	{
		return ((IGraphicalEditPart) getHost()).getEditingDomain();
	}

	/**
	 * Clean all shortcuts to the host element from the same diagram
	 * @generated
	 */
	protected void addDestroyShortcutsCommand(ICompositeCommand cmd, View view)
	{
		assert view.getEAnnotation("Shortcut") == null; //$NON-NLS-1$
		for (Iterator it = view.getDiagram().getChildren().iterator(); it.hasNext();)
		{
			View nextView = (View) it.next();
			if (nextView.getEAnnotation("Shortcut") == null || !nextView.isSetElement() || nextView.getElement() != view.getElement()) { //$NON-NLS-1$
				continue;
			}
			cmd.add(new DeleteCommand(getEditingDomain(), nextView));
		}
	}

	/**
	 * @generated
	 */
	public static LinkConstraints getLinkConstraints()
	{
		LinkConstraints cached = RentalDiagramEditorPlugin.getInstance().getLinkConstraints();
		if (cached == null)
		{
			RentalDiagramEditorPlugin.getInstance().setLinkConstraints(cached = new LinkConstraints());
		}
		return cached;
	}

	/**
	 * @generated
	 */
	public static class LinkConstraints
	{

		/**
		 * @generated
		 */
		LinkConstraints()
		{
			// use static method #getLinkConstraints() to access instance
		}

		/**
		 * @generated
		 */
		public boolean canCreateRentalCustomer_4001(Rental source, Customer target)
		{
			if (source != null)
			{
				if (source.getCustomer() != null)
				{
					return false;
				}
			}

			return canExistRentalCustomer_4001(source, target);
		}

		/**
		 * @generated
		 */
		public boolean canCreateRentalRentedObject_4002(Rental source, RentalObject target)
		{
			if (source != null)
			{
				if (source.getRentedObject() != null)
				{
					return false;
				}
			}

			return canExistRentalRentedObject_4002(source, target);
		}

		/**
		 * @generated
		 */
		public boolean canExistRentalCustomer_4001(Rental source, Customer target)
		{
			return true;
		}

		/**
		 * @generated
		 */
		public boolean canExistRentalRentedObject_4002(Rental source, RentalObject target)
		{
			return true;
		}
	}

}
