/*******************************************************************************
 * Copyright (c) 2007 Chase Technology Ltd - http://www.chasetechnology.co.uk
 * 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:
 *     Doug Satchwell (Chase Technology Ltd) - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.xsl.internal.debug.ui.tabs.main;

import org.eclipse.debug.core.ILaunchConfiguration;
import org.eclipse.debug.core.ILaunchConfigurationWorkingCopy;
import org.eclipse.jface.dialogs.IDialogSettings;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.ICellModifier;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.TextCellEditor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.KeyAdapter;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Item;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.wst.xsl.internal.debug.ui.AbstractTableBlock;
import org.eclipse.wst.xsl.internal.debug.ui.Messages;
import org.eclipse.wst.xsl.internal.debug.ui.XSLDebugUIConstants;
import org.eclipse.wst.xsl.internal.debug.ui.XSLDebugUIPlugin;
import org.eclipse.wst.xsl.internal.debug.ui.actions.AbstractParameterAction;
import org.eclipse.wst.xsl.internal.debug.ui.actions.AddParameterAction;
import org.eclipse.wst.xsl.internal.debug.ui.actions.RemoveParameterAction;
import org.eclipse.wst.xsl.launching.config.LaunchAttribute;
import org.eclipse.wst.xsl.launching.config.LaunchTransform;

public class ParametersBlock extends AbstractTableBlock {
	private ParameterViewer parametersViewer;
	private Button addParameterButton;
	private Button removeParameterButton;
	private final TransformsBlock transformsBlock;
	private final ISelectionChangedListener selectionListener = new ISelectionChangedListener() {
		public void selectionChanged(SelectionChangedEvent event) {
			IStructuredSelection stylesheetSelection = (IStructuredSelection) event
					.getSelection();
			if (stylesheetSelection.size() == 1)
				setTransform((LaunchTransform) stylesheetSelection
						.getFirstElement());
			else
				setTransform(null);
			updateEnabled();
		}
	};
	private Table fTable;

	public ParametersBlock(TransformsBlock transformsBlock) {
		super();
		this.transformsBlock = transformsBlock;
	}

	protected void setTransform(LaunchTransform transform) {
		parametersViewer.getViewer().setInput(transform);
	}

	protected void updateEnabled() {
		IStructuredSelection stylesheetSelection = (IStructuredSelection) transformsBlock
				.getStylesheetViewer().getSelection();
		boolean enabled = stylesheetSelection.size() == 1;
		parametersViewer.getViewer().getTable().setEnabled(enabled);
		addParameterButton.setEnabled(enabled);
		IStructuredSelection parametersSelection = (IStructuredSelection) parametersViewer
				.getViewer().getSelection();
		removeParameterButton.setEnabled(enabled
				&& !parametersSelection.isEmpty());
	}

	public void createControl(Composite parent) {
		Font font = parent.getFont();

		Group group = new Group(parent, SWT.NONE);
		group.setText(getName());
		GridData gd = new GridData(SWT.FILL, SWT.FILL, true, true);
		group.setLayoutData(gd);
		GridLayout layout = new GridLayout();
		layout.numColumns = 3;
		group.setLayout(layout);
		group.setFont(font);

		setControl(group);

		fTable = new Table(group, SWT.BORDER | SWT.MULTI | SWT.FULL_SELECTION);

		GridData data = new GridData(SWT.FILL, SWT.FILL, true, true);
		// data.heightHint = 100;
		fTable.setLayoutData(data);
		fTable.setFont(font);

		fTable.setHeaderVisible(true);
		fTable.setLinesVisible(true);

		TableColumn column1 = new TableColumn(fTable, SWT.NONE);
		column1.setWidth(150);
		column1.setResizable(true);
		column1.setText(Messages.ParametersBlock_0);

		TableColumn column3 = new TableColumn(fTable, SWT.NONE);
		column3.setWidth(250);
		column3.setResizable(true);
		column3.setText(Messages.ParametersBlock_2);

		parametersViewer = new ParameterViewer(fTable);
		parametersViewer.getViewer().setLabelProvider(
				new ParametersLabelProvider());
		parametersViewer.getViewer().setContentProvider(
				new ParametersContentProvider());
		parametersViewer
				.addParametersChangedListener(new IParametersChangedListener() {

					public void parametersChanged(ParameterViewer viewer) {
						updateLaunchConfigurationDialog();
					}
				});
		parametersViewer.getViewer().getTable().addKeyListener(
				new KeyAdapter() {
					@Override
					public void keyPressed(KeyEvent event) {
						if (event.character == SWT.DEL && event.stateMask == 0) {
							RemoveParameterAction ra = new RemoveParameterAction(
									parametersViewer);
							ra.run();
							updateLaunchConfigurationDialog();
						}
					}
				});

		parametersViewer.getViewer().setColumnProperties(
				new String[] { "name", "value" }); //$NON-NLS-1$ //$NON-NLS-2$
		TextCellEditor textEditor = new TextCellEditor(fTable);
		CellEditor[] editors = new CellEditor[] { null, textEditor };
		parametersViewer.getViewer().setCellEditors(editors);
		parametersViewer.getViewer().setCellModifier(new ICellModifier() {
			public boolean canModify(Object element, String property) {
				return "value".equals(property); //$NON-NLS-1$ 
			}

			public Object getValue(Object element, String property) {
				LaunchAttribute att = (LaunchAttribute) element;
				return att.value == null ? "" : att.value; //$NON-NLS-1$
			}

			public void modify(Object element, String property, Object value) {
				Item item = (Item) element;
				LaunchAttribute att = (LaunchAttribute) item.getData();
				att.value = (String) value;
				parametersViewer.getViewer().update(att, null);
				updateLaunchConfigurationDialog();
			}
		});

		Composite parameterButtonComp = new Composite(group, SWT.NONE);
		GridLayout parameterButtonCompLayout = new GridLayout();
		parameterButtonCompLayout.marginHeight = 0;
		parameterButtonCompLayout.marginWidth = 0;
		parameterButtonComp.setLayout(parameterButtonCompLayout);
		gd = new GridData(GridData.VERTICAL_ALIGN_BEGINNING
				| GridData.HORIZONTAL_ALIGN_FILL);
		gd.horizontalSpan = 2;
		parameterButtonComp.setLayoutData(gd);
		parameterButtonComp.setFont(font);

		addParameterButton = createButton(parameterButtonComp,
				new AddParameterAction(parametersViewer));
		removeParameterButton = createButton(parameterButtonComp,
				new RemoveParameterAction(parametersViewer));

		transformsBlock.getStylesheetViewer().addSelectionChangedListener(
				selectionListener);

		restoreColumnSettings();
	}

	protected Button createButton(Composite pathButtonComp,
			AbstractParameterAction action) {
		Button button = createPushButton(pathButtonComp, action.getText(), null);
		action.setButton(button);
		return button;
	}

	@Override
	protected Table getTable() {
		return fTable;
	}

	@Override
	protected IDialogSettings getDialogSettings() {
		return XSLDebugUIPlugin.getDefault().getDialogSettings();
	}

	@Override
	protected String getQualifier() {
		return XSLDebugUIConstants.MAIN_PARAMATERS_BLOCK;
	}

	public String getName() {
		return Messages.ParametersBlock_9;
	}

	public void initializeFrom(ILaunchConfiguration configuration) {
		// handled by the Tab
		updateEnabled();
	}

	public void performApply(ILaunchConfigurationWorkingCopy configuration) {
		// handled by the Tab
	}

	public void setDefaults(ILaunchConfigurationWorkingCopy configuration) {
		// handled by the Tab
	}

	@Override
	public void dispose() {
		if (transformsBlock.getStylesheetViewer() != null)
			transformsBlock.getStylesheetViewer()
					.removeSelectionChangedListener(selectionListener);
		super.dispose();
	}
}