/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 *
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.team.ui.synchronize;

import java.lang.reflect.InvocationTargetException;

import org.eclipse.compare.CompareConfiguration;
import org.eclipse.compare.CompareUI;
import org.eclipse.compare.IContentChangeListener;
import org.eclipse.compare.IContentChangeNotifier;
import org.eclipse.compare.ITypedElement;
import org.eclipse.compare.structuremergeviewer.DiffNode;
import org.eclipse.compare.structuremergeviewer.ICompareInput;
import org.eclipse.compare.structuremergeviewer.IDiffElement;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.Adapters;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.jface.action.ToolBarManager;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.team.internal.ui.Policy;
import org.eclipse.team.internal.ui.TeamUIMessages;
import org.eclipse.team.internal.ui.Utils;
import org.eclipse.team.internal.ui.synchronize.DialogSynchronizePageSite;
import org.eclipse.team.internal.ui.synchronize.LocalResourceTypedElement;
import org.eclipse.team.internal.ui.synchronize.SyncInfoModelElement;
import org.eclipse.team.internal.ui.synchronize.SynchronizePageConfiguration;
import org.eclipse.team.internal.ui.synchronize.SynchronizeView;
import org.eclipse.team.ui.PageCompareEditorInput;
import org.eclipse.team.ui.PageSaveablePart;
import org.eclipse.team.ui.mapping.ISynchronizationCompareInput;
import org.eclipse.team.ui.mapping.SaveableComparison;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.part.IPageBookViewPage;

/**
 * Displays a synchronize participant page combined with the compare/merge infrastructure. This only works if the
 * synchronize page viewer provides selections that are of the following types: ITypedElement and ICompareInput
 * or if the participant is a {@link ModelSynchronizeParticipant}.
 *
 * @since 3.0
 * @deprecated Clients should use a subclass of {@link PageCompareEditorInput}
 *      and {@link CompareUI#openCompareDialog(org.eclipse.compare.CompareEditorInput)}
 */
@Deprecated
public class ParticipantPageSaveablePart extends PageSaveablePart implements IContentChangeListener {
	private ISynchronizeParticipant participant;
	private ISynchronizePageConfiguration pageConfiguration;
	private Image titleImage;

	private IPageBookViewPage page;
	private DialogSynchronizePageSite site;

	private IPropertyChangeListener listener;
	private Viewer viewer;

	/**
	 * Creates a part for the provided participant. The page configuration is used when creating the participant page and the resulting
	 * compare/merge panes will be configured with the provided compare configuration.
	 * <p>
	 * For example, clients can decide if the user can edit the compare panes by calling {@link CompareConfiguration#setLeftEditable(boolean)}
	 * or {@link CompareConfiguration#setRightEditable(boolean)}.
	 * </p>
	 * @param shell the parent shell for this part
	 * @param cc the compare configuration that will be used to create the compare panes
	 * @param pageConfiguration the configuration that will be provided to the participant prior to creating the page
	 * @param participant the participant whose page will be displayed in this part
	 */
	public ParticipantPageSaveablePart(Shell shell, CompareConfiguration cc, ISynchronizePageConfiguration pageConfiguration, ISynchronizeParticipant participant) {
		super(shell,cc);
		this.participant = participant;
		this.pageConfiguration = pageConfiguration;
	}

	@Override
	public void dispose() {
		if(titleImage != null) {
			titleImage.dispose();
		}
		if (page != null)
			page.dispose();
		if (site != null)
			site.dispose();
		pageConfiguration.removePropertyChangeListener(listener);
		super.dispose();
	}

	@Override
	public Image getTitleImage() {
		if(titleImage == null) {
			titleImage = participant.getImageDescriptor().createImage();
		}
		return titleImage;
	}

	@Override
	public String getTitle() {
		return Utils.shortenText(SynchronizeView.MAX_NAME_LENGTH, participant.getName());
	}

	@Override
	public boolean isDirty() {
		if (participant instanceof ModelSynchronizeParticipant) {
			ModelSynchronizeParticipant msp = (ModelSynchronizeParticipant) participant;
			SaveableComparison currentBuffer = msp.getActiveSaveable();
			if (currentBuffer != null) {
				return currentBuffer.isDirty();
			}
		}
		return super.isDirty();
	}

	@Override
	public void contentChanged(IContentChangeNotifier source) {
		try {
			if (source instanceof DiffNode) {
				commit(new NullProgressMonitor(), (DiffNode) source);
			} else if (source instanceof LocalResourceTypedElement) {
				((LocalResourceTypedElement) source).commit(new NullProgressMonitor());
			}
		} catch (CoreException e) {
			Utils.handle(e);
		}
	}

	@Override
	public void doSave(IProgressMonitor pm) {
		// TODO needs to work for models
		super.doSave(pm);
		Object input = viewer.getInput();
		if (input instanceof ISynchronizeModelElement) {
			ISynchronizeModelElement root = (ISynchronizeModelElement)input;
			if (root != null && root instanceof DiffNode) {
				try {
					commit(pm, (DiffNode)root);
				} catch (CoreException e) {
					Utils.handle(e);
				} finally {
					setDirty(false);
				}
			}
		}
	}

	@Override
	protected Control createPage(Composite parent, ToolBarManager toolBarManager) {
		listener = event -> {
			if (event.getProperty().equals(ISynchronizePageConfiguration.P_PAGE_DESCRIPTION)) {
				updateDescription();
			}
		};
		pageConfiguration.addPropertyChangeListener(listener);
		updateDescription();

		page = participant.createPage(pageConfiguration);
		site = new DialogSynchronizePageSite(getShell(), true);
		((SynchronizePageConfiguration)pageConfiguration).setSite(site);
		site.createActionBars(toolBarManager);
		try {
			((ISynchronizePage)page).init(pageConfiguration.getSite());
		} catch (PartInitException e1) {
		}

		page.createControl(parent);

		initializeDiffViewer(((ISynchronizePage)page).getViewer());

		page.setActionBars(site.getActionBars());
		toolBarManager.update(true);
		viewer = ((ISynchronizePage)page).getViewer();

		setNavigator(pageConfiguration);
		return page.getControl();
	}

	@Override
	protected final ISelectionProvider getSelectionProvider() {
		return ((ISynchronizePage)page).getViewer();
	}

	private void updateDescription() {
		String description = (String)pageConfiguration.getProperty(ISynchronizePageConfiguration.P_PAGE_DESCRIPTION);
		if (description != null) {
			setPageDescription(description);
		}
	}

	/**
	 * Initialize the diff viewer created for this compare input. If a subclass
	 * overrides the <code>createDiffViewer(Composite)</code> method, it should
	 * invoke this method on the created viewer in order to get the proper
	 * labeling in the compare input's contents viewers.
	 * @param viewer the diff viewer created by the compare input
	 */
	private void initializeDiffViewer(Viewer viewer) {
		if (viewer instanceof StructuredViewer) {
			((StructuredViewer) viewer).addOpenListener(event -> {
				ISelection s = event.getSelection();
				final SyncInfoModelElement node = getElement(s);
				if (node == null) {
					ICompareInput input = getCompareInput(s);
					if (input != null) {
						prepareCompareInput(input);
					}
				} else {
					prepareCompareInput(node);
				}
			});
		}
	}

	/**
	 * {@inheritDoc}
	 * @since 3.2
	 */
	@Override
	protected void prepareInput(final ICompareInput input, CompareConfiguration configuration, IProgressMonitor monitor) throws InvocationTargetException {
		monitor.beginTask(TeamUIMessages.SyncInfoCompareInput_3, 100);
		monitor.setTaskName(TeamUIMessages.SyncInfoCompareInput_3);
		try {
			// First, see if the active buffer is changing
			checkForBufferChange(pageConfiguration.getSite().getShell(), input, false /* cancel not allowed */, monitor);
			if (input instanceof SyncInfoModelElement) {
				final SyncInfoModelElement node = (SyncInfoModelElement) input;
				IResource resource = node.getResource();
				if (resource != null && resource.getType() == IResource.FILE) {
					participant.prepareCompareInput(node, configuration, monitor);
				}
			} else {
				ISynchronizationCompareInput adapter = asModelCompareInput(input);
				if (adapter != null) {
					adapter.prepareInput(configuration, Policy.subMonitorFor(monitor, 90));
				}
			}
		} catch (CoreException e) {
			throw new InvocationTargetException(e);
		} finally {
			monitor.done();
		}
	}

	private void checkForBufferChange(Shell shell, final ICompareInput input, boolean cancelAllowed, IProgressMonitor monitor) throws CoreException {
		ISynchronizeParticipant participant = pageConfiguration.getParticipant();
		if (participant instanceof ModelSynchronizeParticipant) {
			ModelSynchronizeParticipant msp = (ModelSynchronizeParticipant) participant;
			if (input instanceof ISynchronizationCompareInput) {
				ISynchronizationCompareInput mci = (ISynchronizationCompareInput) input;
				msp.checkForBufferChange(shell, mci, cancelAllowed, monitor);
			}
		}
	}

	private ISynchronizationCompareInput asModelCompareInput(ICompareInput input) {
		return Adapters.adapt(input, ISynchronizationCompareInput.class);
	}

	private SyncInfoModelElement getElement(ISelection selection) {
		ICompareInput input = getCompareInput(selection);
		if(input instanceof SyncInfoModelElement) {
			return (SyncInfoModelElement)input;
		}
		return null;
	}

	private static void commit(IProgressMonitor pm, DiffNode node) throws CoreException {
		ITypedElement left = node.getLeft();
		if (left instanceof LocalResourceTypedElement)
			((LocalResourceTypedElement) left).commit(pm);

		ITypedElement right = node.getRight();
		if (right instanceof LocalResourceTypedElement)
			((LocalResourceTypedElement) right).commit(pm);

		IDiffElement[] children = node.getChildren();
		for (int i = 0; i < children.length; i++) {
			commit(pm, (DiffNode)children[i]);
		}
	}

	/**
	 * Return the synchronize page configuration for this part
	 *
	 * @return Returns the pageConfiguration.
	 */
	public ISynchronizePageConfiguration getPageConfiguration() {
		return pageConfiguration;
	}

	/**
	 * Return the Synchronize participant for this part
	 *
	 * @return Returns the participant.
	 */
	public ISynchronizeParticipant getParticipant() {
		return participant;
	}

	/**
	 * {@inheritDoc}
	 * @since 3.2
	 */
	@Override
	protected ICompareInput getCompareInput(ISelection selection) {
		ICompareInput compareInput = super.getCompareInput(selection);
		if (compareInput != null)
			return compareInput;

		if (selection != null && selection instanceof IStructuredSelection) {
			IStructuredSelection ss= (IStructuredSelection) selection;
			if (ss.size() == 1) {
				Object o = ss.getFirstElement();
				if (participant instanceof ModelSynchronizeParticipant) {
					ModelSynchronizeParticipant msp = (ModelSynchronizeParticipant) participant;
					return msp.asCompareInput(o);
				}
			}
		}
		return null;
	}


}