/*******************************************************************************
 * Copyright (c) 2008-2011 Chair for Applied Software Engineering,
 * Technische Universitaet Muenchen.
 * 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:
 * wesendon
 ******************************************************************************/
package org.eclipse.emf.emfstore.internal.client.ui.controller;

import java.text.MessageFormat;
import java.util.Date;
import java.util.List;
import java.util.concurrent.Callable;

import org.apache.commons.lang.StringUtils;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.emf.emfstore.client.ESLocalProject;
import org.eclipse.emf.emfstore.client.callbacks.ESCommitCallback;
import org.eclipse.emf.emfstore.client.util.RunESCommand;
import org.eclipse.emf.emfstore.common.model.ESModelElementIdToEObjectMapping;
import org.eclipse.emf.emfstore.internal.client.model.ProjectSpace;
import org.eclipse.emf.emfstore.internal.client.model.exceptions.CancelOperationException;
import org.eclipse.emf.emfstore.internal.client.model.impl.api.ESLocalProjectImpl;
import org.eclipse.emf.emfstore.internal.client.model.util.WorkspaceUtil;
import org.eclipse.emf.emfstore.internal.client.ui.common.RunInUI;
import org.eclipse.emf.emfstore.internal.client.ui.common.RunInUI.WithException;
import org.eclipse.emf.emfstore.internal.client.ui.dialogs.BranchSelectionDialog;
import org.eclipse.emf.emfstore.internal.client.ui.dialogs.CommitDialog;
import org.eclipse.emf.emfstore.internal.common.model.impl.ESModelElementIdToEObjectMappingImpl;
import org.eclipse.emf.emfstore.internal.server.model.impl.api.ESAbstractChangePackageImpl;
import org.eclipse.emf.emfstore.internal.server.model.versioning.BranchInfo;
import org.eclipse.emf.emfstore.internal.server.model.versioning.BranchVersionSpec;
import org.eclipse.emf.emfstore.internal.server.model.versioning.LogMessage;
import org.eclipse.emf.emfstore.internal.server.model.versioning.PrimaryVersionSpec;
import org.eclipse.emf.emfstore.internal.server.model.versioning.VersioningFactory;
import org.eclipse.emf.emfstore.internal.server.model.versioning.Versions;
import org.eclipse.emf.emfstore.server.exceptions.ESException;
import org.eclipse.emf.emfstore.server.exceptions.ESUpdateRequiredException;
import org.eclipse.emf.emfstore.server.model.ESChangePackage;
import org.eclipse.emf.emfstore.server.model.versionspec.ESPrimaryVersionSpec;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.widgets.Shell;

/**
 * UIController for branch creation. Slightly modified copy of the commit
 * controller
 *
 * @author wesendon
 *
 */
public class UICreateBranchController extends
AbstractEMFStoreUIController<ESPrimaryVersionSpec> implements
ESCommitCallback {

	private final ProjectSpace projectSpace;
	private int dialogReturnValue;
	private BranchVersionSpec branch;

	/**
	 * Constructor.
	 *
	 * @param shell
	 *            the parent {@link Shell} that should be used during the
	 *            creation of the branch
	 * @param projectSpace
	 *            the project space for which to create a branch for
	 */
	public UICreateBranchController(Shell shell, ESLocalProject projectSpace) {
		this(shell, projectSpace, null);
	}

	/**
	 * Constructor.
	 *
	 * @param shell
	 *            the parent {@link Shell} that should be used during the
	 *            creation of the branch
	 * @param localProject
	 *            the project space for which to create a branch for
	 * @param branch
	 *            the branch to be committed
	 */
	public UICreateBranchController(Shell shell, ESLocalProject localProject,
		BranchVersionSpec branch) {
		super(shell, true, true);
		projectSpace = ((ESLocalProjectImpl) localProject)
			.toInternalAPI();
		this.branch = branch;
	}

	/**
	 *
	 * {@inheritDoc}
	 *
	 * @see org.eclipse.emf.emfstore.client.callbacks.ESCommitCallback#noLocalChanges(ESLocalProject)
	 */
	public void noLocalChanges(ESLocalProject projectSpace) {
		RunInUI.run(new Callable<Void>() {
			public Void call() throws Exception {
				MessageDialog.openInformation(getShell(), null,
					Messages.UICreateBranchController_NoLocalChanges);
				return null;
			}
		});
	}

	/**
	 *
	 * {@inheritDoc}
	 *
	 * @see org.eclipse.emf.emfstore.client.callbacks.ESCommitCallback#baseVersionOutOfDate(ESLocalProject,
	 *      IProgressMonitor)
	 */
	public boolean baseVersionOutOfDate(final ESLocalProject projectSpace,
		final IProgressMonitor progressMonitor) {

		final String message = Messages.UICreateBranchController_ProjectOutdated;
		return RunInUI.runWithResult(new Callable<Boolean>() {

			public Boolean call() throws Exception {
				final boolean shouldUpdate = MessageDialog.openConfirm(getShell(),
					Messages.UICreateBranchController_Confirmation,
					message);
				if (shouldUpdate) {
					final ESPrimaryVersionSpec baseVersion = UICreateBranchController.this.projectSpace
						.getBaseVersion().toAPI();
					final ESPrimaryVersionSpec version = new UIUpdateProjectController(
						getShell(), projectSpace)
					.executeSub(progressMonitor);
					if (version.equals(baseVersion)) {
						return false;
					}

				}
				return shouldUpdate;
			}
		});
	}

	/**
	 *
	 * {@inheritDoc}
	 *
	 * @see org.eclipse.emf.emfstore.client.callbacks.ESCommitCallback#inspectChanges(ESLocalProject, ESChangePackage,
	 *      ESModelElementIdToEObjectMapping)
	 */

	public boolean inspectChanges(
		ESLocalProject localProject,
		final ESChangePackage changePackage,
		ESModelElementIdToEObjectMapping idToEObjectMapping) {

		final ESLocalProjectImpl localProjectImpl = (ESLocalProjectImpl) localProject;

		final CommitDialog commitDialog = new CommitDialog(getShell(),
			ESAbstractChangePackageImpl.class.cast(changePackage).toInternalAPI(),
			localProjectImpl.toInternalAPI(),
			((ESModelElementIdToEObjectMappingImpl) idToEObjectMapping).toInternalAPI());

		dialogReturnValue = RunInUI.runWithResult(new Callable<Integer>() {
			public Integer call() throws Exception {
				return commitDialog.open();
			}
		});

		if (dialogReturnValue == Window.OK) {
			RunESCommand.run(new Callable<Void>() {
				public Void call() throws Exception {
					final LogMessage logMessage = VersioningFactory.eINSTANCE.createLogMessage();
					logMessage.setAuthor(projectSpace
						.getUsersession().getUsername());
					logMessage.setClientDate(new Date());
					logMessage.setMessage(commitDialog.getLogText());
					changePackage.setLogMessage(logMessage.toAPI());
					return null;
				}
			});
			return true;
		}

		return false;
	}

	/**
	 *
	 * {@inheritDoc}
	 *
	 * @see org.eclipse.emf.emfstore.internal.client.ui.controller.AbstractEMFStoreUIController#doRun(org.eclipse.core.runtime.IProgressMonitor)
	 */
	@Override
	public ESPrimaryVersionSpec doRun(final IProgressMonitor progressMonitor)
		throws ESException {
		try {
			if (branch == null) {
				branch = branchSelection(projectSpace);
			}

			final PrimaryVersionSpec commitToBranch = projectSpace.commitToBranch(
				branch,
				null,
				UICreateBranchController.this,
				progressMonitor);
			return commitToBranch.toAPI();
		} catch (final ESUpdateRequiredException e) {
			// project is out of date and user canceled update
			// ignore
		} catch (final ESException e) {
			if (e instanceof CancelOperationException) {
				return null;
			}
			WorkspaceUtil.logException(e.getMessage(), e);
			RunInUI.run(new Callable<Void>() {
				public Void call() throws Exception {
					MessageDialog.openError(getShell(),
						Messages.UICreateBranchController_CreateBranch_Title,
						MessageFormat.format(Messages.UICreateBranchController_CreateBranch_Message, e.getMessage()));
					return null;
				}
			});
		}

		return null;
	}

	private BranchVersionSpec branchSelection(final ProjectSpace projectSpace)
		throws ESException {
		final List<BranchInfo> branches = projectSpace.getBranches();

		final String branch = WithException
			.runWithResult(new Callable<String>() {

				public String call() throws Exception {
					final BranchSelectionDialog.Creation dialog = new BranchSelectionDialog.Creation(
						getShell(), branches);
					dialog.setBlockOnOpen(true);

					if (dialog.open() != Window.OK
						|| dialog.getNewBranch() == null
						|| dialog.getNewBranch().equals(StringUtils.EMPTY)) {
						throw new CancelOperationException(
							Messages.UICreateBranchController_NoBranchSpecified);
					}
					return dialog.getNewBranch();
				}
			});

		return Versions.createBRANCH(branch);
	}
}