/*

* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

package com.nokia.carbide.internal.discovery.ui.wizard;

import java.io.File;

import java.util.ArrayList;

import java.util.Collection;

import org.eclipse.core.runtime.IPath;

import org.eclipse.core.runtime.IProgressMonitor;

import org.eclipse.core.runtime.IStatus;

import org.eclipse.core.runtime.Path;

import org.eclipse.core.runtime.Status;

import org.eclipse.jface.dialogs.DialogPage;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.SelectionAdapter;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.FileDialog;

import org.eclipse.ui.progress.UIJob;

import com.nokia.carbide.discovery.ui.Messages;

import com.nokia.cpp.internal.api.utils.ui.BrowseDialogUtils;

/**

 * Page in export wizard

 */

class ExportPage extends AbstractImportExportPage {

	private File file;

	private Collection<FeatureInfo> featureInfos;

	private static String saveAsParent;

	protected ExportPage() {

		super("ExportPage"); //$NON-NLS-1$

		setTitle(Messages.ExportPage_Title);

		setDescription(Messages.ExportPage_Description);

	}

	public void createControl(Composite parent) {

		super.createControl(parent);

		Composite composite = (Composite) getControl();

        createViewerGroup(composite, Messages.ExportPage_ViewerGroupLabel);

		createBrowseGroup(composite, Messages.ExportPage_BrowseGroupLabel);

        featureInfos = new ArrayList<FeatureInfo>();

        setPageComplete(validatePage());

	}

	@Override

	protected void createViewerGroup(Composite parent, String labelText) {

		super.createViewerGroup(parent, labelText);

		startGetInputJob();

		updateViewer();

	}

	@Override

	protected void createBrowseGroup(Composite parent, String labelText) {

		super.createBrowseGroup(parent, labelText);

		if (saveAsParent == null)

			saveAsParent = System.getProperty("user.home"); //$NON-NLS-1$

		pathText.setText(new Path(saveAsParent).append("exportedFeatures.xml").toOSString()); //$NON-NLS-1$

        browseButton.addSelectionListener(new SelectionAdapter() {

			@Override

			public void widgetSelected(SelectionEvent e) {

				FileDialog dialog =  new FileDialog(getShell(), SWT.SAVE);

				dialog.setText(Messages.ExportPage_FileDialogText);

				BrowseDialogUtils.initializeFrom(dialog, pathText.getText());

				dialog.setOverwrite(true); // prompt for overwrite

				String path = dialog.open();

				if (path != null) {

					IPath saveAsPath = new Path(path);

					saveAsParent = saveAsPath.removeLastSegments(1).toString();

					pathText.setText(saveAsPath.toOSString());

				}

			}

        });

	}

	private void startGetInputJob() {

		UIJob j = new UIJob(Messages.ExportPage_GetFeaturesJobName) {

			@Override

			public IStatus runInUIThread(IProgressMonitor monitor) {

				viewer.setInput(P2Utils.getInstalledFeatures(monitor));

				updateViewer();

				return Status.OK_STATUS;

			} 

		};

		j.schedule();

	}

	protected boolean validatePage() {

		setErrorMessage(null);

		if (viewer.getTable().getItemCount() == 0) {

			setErrorMessage(Messages.ExportPage_NoFeaturesError);

			return false;

		}

		if (viewer.getCheckedElements().length == 0) {

			setErrorMessage(Messages.ExportPage_NoFeaturesSelectedError);

			return false;

		}

		IPath path = new Path(pathText.getText());

		file = path.toFile();

		if (!file.isAbsolute()) {

			setErrorMessage(Messages.ExportPage_NoFileError);

			return false;

		}

		if (file.exists()) {

			setMessage(Messages.ExportPage_FileOverwriteWarning, DialogPage.WARNING);

		}

		return true;

	}

	public File getFile() {

		return file;

	}

	public Collection<FeatureInfo> getFeatureInfos() {

		featureInfos.clear();

		for (Object o : viewer.getCheckedElements()) {

			featureInfos.add((FeatureInfo) o);

		}

		return featureInfos;

	}

}