/*******************************************************************************
 * Copyright (c) 2010, 2016 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *     Lars Vogel <Lars.Vogel@vogella.com> - Bug 395825
 *     Simon Scholz <simon.scholz@vogella.com> - Bug 486876
 ******************************************************************************/
package org.eclipse.e4.ui.internal.workbench;

import java.util.Collection;
import java.util.Optional;
import javax.inject.Inject;
import org.eclipse.e4.core.contexts.IEclipseContext;
import org.eclipse.e4.ui.model.application.MApplication;
import org.eclipse.e4.ui.model.application.ui.advanced.MPerspective;
import org.eclipse.e4.ui.model.application.ui.advanced.MPlaceholder;
import org.eclipse.e4.ui.model.application.ui.basic.MInputPart;
import org.eclipse.e4.ui.model.application.ui.basic.MPart;
import org.eclipse.e4.ui.workbench.modeling.EPartService;
import org.eclipse.e4.ui.workbench.modeling.IPartListener;

public class ApplicationPartServiceImpl implements EPartService {

	private MApplication application;

	@Inject
	ApplicationPartServiceImpl(MApplication application) {
		this.application = application;
	}

	private EPartService getActiveWindowService() {
		IEclipseContext activeWindowContext = application.getContext().getActiveChild();
		if (activeWindowContext == null) {
			throw new IllegalStateException("Application does not have an active window"); //$NON-NLS-1$
		}
		EPartService activeWindowPartService = activeWindowContext.get(EPartService.class);
		if (activeWindowPartService == null) {
			throw new IllegalStateException("Active window context is invalid"); //$NON-NLS-1$
		}
		if (activeWindowPartService == this) {
			throw new IllegalStateException("Application does not have an active window"); //$NON-NLS-1$
		}
		return activeWindowPartService;
	}

	@Override
	public void addPartListener(IPartListener listener) {
		throw new UnsupportedOperationException(
				"Listeners should only be attached/removed from a window's part service"); //$NON-NLS-1$
	}

	@Override
	public void removePartListener(IPartListener listener) {
		throw new UnsupportedOperationException(
				"Listeners should only be attached/removed from a window's part service"); //$NON-NLS-1$
	}

	@Override
	public boolean isPartOrPlaceholderInPerspective(String elementId, MPerspective perspective) {
		return getActiveWindowService().isPartOrPlaceholderInPerspective(elementId, perspective);
	}

	@Override
	public void switchPerspective(MPerspective perspective) {
		getActiveWindowService().switchPerspective(perspective);
	}

	@Override
	public Optional<MPerspective> switchPerspective(String perspectiveId) {
		return getActiveWindowService().switchPerspective(perspectiveId);
	}

	@Override
	public void activate(MPart part) {
		getActiveWindowService().activate(part);
	}

	@Override
	public void activate(MPart part, boolean requiresFocus) {
		getActiveWindowService().activate(part, requiresFocus);
	}

	@Override
	public void requestActivation() {
		getActiveWindowService().requestActivation();
	}

	@Override
	public void bringToTop(MPart part) {
		getActiveWindowService().bringToTop(part);
	}

	@Override
	public MPart findPart(String id) {
		return getActiveWindowService().findPart(id);
	}

	@Override
	public Collection<MPart> getParts() {
		return getActiveWindowService().getParts();
	}

	@Override
	public MPart getActivePart() {
		return getActiveWindowService().getActivePart();
	}

	@Override
	public boolean isPartVisible(MPart part) {
		return getActiveWindowService().isPartVisible(part);
	}

	@Override
	public MPart createPart(String id) {
		return getActiveWindowService().createPart(id);
	}

	@Override
	public MPlaceholder createSharedPart(String id) {
		return getActiveWindowService().createSharedPart(id);
	}

	@Override
	public MPlaceholder createSharedPart(String id, boolean force) {
		return getActiveWindowService().createSharedPart(id, force);
	}

	@Override
	public MPart showPart(String id, PartState partState) {
		return getActiveWindowService().showPart(id, partState);
	}

	@Override
	public MPart showPart(MPart part, PartState partState) {
		return getActiveWindowService().showPart(part, partState);
	}

	@Override
	public void hidePart(MPart part) {
		getActiveWindowService().hidePart(part);
	}

	@Override
	public void hidePart(MPart part, boolean force) {
		getActiveWindowService().hidePart(part, force);
	}

	@Override
	public Collection<MPart> getDirtyParts() {
		return getActiveWindowService().getDirtyParts();
	}

	@Override
	public boolean savePart(MPart part, boolean confirm) {
		return getActiveWindowService().savePart(part, confirm);
	}

	@Override
	public boolean saveAll(boolean confirm) {
		return getActiveWindowService().saveAll(confirm);
	}

	@Override
	public Collection<MInputPart> getInputParts(String inputUri) {
		return getActiveWindowService().getInputParts(inputUri);
	}

}