/*

* Copyright (c) 2009 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.cpp.internal.api.utils.ui;

import com.nokia.cpp.internal.api.utils.core.Check;

import org.eclipse.core.resources.IFile;

import org.eclipse.jface.dialogs.Dialog;

import org.eclipse.jface.dialogs.IDialogConstants;

import org.eclipse.jface.viewers.*;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.SelectionAdapter;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.graphics.Image;

import org.eclipse.swt.graphics.Point;

import org.eclipse.swt.layout.*;

import org.eclipse.swt.widgets.*;

import org.eclipse.ui.model.WorkbenchLabelProvider;

import java.util.List;

/**

 * A dialog that displays files in a table with checkboxes.

 * Constructor argument is List<IFile> and the dialog modifies the list with only the checked files if ok.

 */

public class FilesListDialog extends Dialog {

	private class FilesListContentProvider implements IStructuredContentProvider {

		public Object[] getElements(Object inputElement) {

			Check.checkArg(inputElement instanceof List);

			List<IFile> paths = (List<IFile>) inputElement;

			return paths.toArray();

		}

		public void dispose() {}

		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {}

	}

	private class FilesListLabelProvider extends LabelProvider {

		private ILabelProvider wbLabelProvider;

		public FilesListLabelProvider() {

			wbLabelProvider = WorkbenchLabelProvider.getDecoratingWorkbenchLabelProvider();

		}

		@Override

		public Image getImage(Object element) {

			return wbLabelProvider.getImage(element);

		}

		@Override

		public String getText(Object element) {

			IFile file = (IFile) element;

			return file.getFullPath().makeRelative().toString();

		}

	}

	private TableViewer filesTableViewer;

	private final List<IFile> filesList;

	private String caption;

	private String title;

	private Button okButton;

	private Text label;

	private boolean initiallyChecked;

	private boolean editable;

	private String okButtonLabel;

	private String cancelButtonLabel;

	/**

	 * Create the dialog with checkbox viewer

	 * @param parentShell

	 * @param filesList

	 * @param title

	 * @param caption

	 * @param initiallyChecked

	 */

	public FilesListDialog(Shell parentShell, List<IFile> filesList, String title, String caption, boolean initiallyChecked) {

		this(parentShell, filesList, title, caption, SWT.DIALOG_TRIM | SWT.RESIZE | SWT.MODELESS);

		this.initiallyChecked = initiallyChecked;

		editable = true;

	}

	/**

	 * Create the dialog with no checkboxes

	 * @param parentShell

	 * @param filesList

	 * @param title

	 * @param caption

	 */

	public FilesListDialog(Shell parentShell, List<IFile> filesList, String title, String caption) {

		// use system modal to ensure supercedes progress dialog

		this(parentShell, filesList, title, caption, SWT.DIALOG_TRIM | SWT.RESIZE | SWT.SYSTEM_MODAL);

	}

	private FilesListDialog(Shell parentShell, List<IFile> filesList, String title, String caption, int style) {

		super(parentShell);

		setShellStyle(style);

		this.filesList = filesList;

		this.title = title;

		this.caption = caption;

		this.okButtonLabel = IDialogConstants.OK_LABEL;

		this.cancelButtonLabel = IDialogConstants.CANCEL_LABEL;

	}

	/**

	 * Create contents of the dialog

	 * @param parent

	 */

	@Override

	protected Control createDialogArea(Composite parent) {

		Composite area = (Composite) super.createDialogArea(parent);

		Composite container = new Composite(area, SWT.NONE);

		container.setLayout(new FillLayout(SWT.VERTICAL));

		container.setLayoutData(new GridData(GridData.FILL_BOTH));

		final Composite contents = new Composite(container, SWT.NONE);

		final GridLayout gridLayout = new GridLayout();

		gridLayout.numColumns = 2;

		gridLayout.verticalSpacing = 20;

		gridLayout.marginTop = 10;

		gridLayout.marginRight = 10;

		gridLayout.marginLeft = 10;

		gridLayout.marginBottom = 10;

		gridLayout.horizontalSpacing = 20;

		contents.setLayout(gridLayout);

		label = new Text(contents, SWT.WRAP | SWT.READ_ONLY);

		final GridData gd_label = new GridData(SWT.FILL, SWT.FILL, false, false, 2, 1);

		gd_label.widthHint = 400;

		label.setLayoutData(gd_label);

		label.setText(caption);

		if (editable)

			filesTableViewer = CheckboxTableViewer.newCheckList(contents, SWT.BORDER);

		else

			filesTableViewer = new TableViewer(contents, SWT.BORDER);

		final GridData gd_table = new GridData(SWT.FILL, SWT.FILL, true, true, 2, 1);

		gd_table.widthHint = 350;

		filesTableViewer.getTable().setLayoutData(gd_table);

		//

		filesTableViewer.setContentProvider(new FilesListContentProvider());

		filesTableViewer.setLabelProvider(new FilesListLabelProvider());

		filesTableViewer.setInput(filesList);

		if (editable) {

			final CheckboxTableViewer viewer = (CheckboxTableViewer) filesTableViewer;

			viewer.setAllChecked(initiallyChecked);

			viewer.addCheckStateListener(new ICheckStateListener() {

				public void checkStateChanged(CheckStateChangedEvent event) {

					updateOkButtonEnabled();

				}

			});

			final Button selectAllButton = new Button(contents, SWT.NONE);

			selectAllButton.addSelectionListener(new SelectionAdapter() {

				public void widgetSelected(SelectionEvent e) {

					viewer.setAllChecked(true);

					updateOkButtonEnabled();

				}

			});

			selectAllButton.setLayoutData(new GridData(90, SWT.DEFAULT));

			selectAllButton.setText("Select &All");

			final Button selectNoneButton = new Button(contents, SWT.NONE);

			selectNoneButton.addSelectionListener(new SelectionAdapter() {

				public void widgetSelected(SelectionEvent e) {

					viewer.setAllChecked(false);

					updateOkButtonEnabled();

				}

			});

			selectNoneButton.setLayoutData(new GridData(90, SWT.DEFAULT));

			selectNoneButton.setText("&Deselect All");

		}

		filesTableViewer.getControl().forceFocus();

		return area;

	}

	public void setAltButtonLabels(String okButtonLabel, String cancelButtonLabel) {

		this.okButtonLabel = okButtonLabel;

		this.cancelButtonLabel = cancelButtonLabel;

	}

	/**

	 * Create contents of the button bar

	 * @param parent

	 */

	@Override

	protected void createButtonsForButtonBar(Composite parent) {

		okButton = createButton(parent, IDialogConstants.OK_ID, okButtonLabel, true);

		updateOkButtonEnabled();

		createButton(parent, IDialogConstants.CANCEL_ID, cancelButtonLabel, false);

	}

	private void updateOkButtonEnabled() {

		if (editable)

			okButton.setEnabled(((CheckboxTableViewer) filesTableViewer).getCheckedElements().length > 0);

	}

	protected void okPressed() {

		if (editable) {

			TableItem[] tableItems = filesTableViewer.getTable().getItems();

			for (int i = 0; i < tableItems.length; i++) {

				TableItem tableItem = tableItems[i];

				if (!tableItem.getChecked()) {

					filesList.remove((IFile) tableItem.getData());

				}

			}

		}

		super.okPressed();

	}

	/**

	 * Return the initial size of the dialog

	 */

	@Override

	protected Point getInitialSize() {

		return new Point(500, 375);

	}

	protected void configureShell(Shell newShell) {

		super.configureShell(newShell);

		newShell.setText(title);

	}

}