/*******************************************************************************
 * Copyright (c) 2008 IBM Corporation.
 * 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:
 *     IBM Corporation - initial API and implementation
 ******************************************************************************/
package org.eclipse.ptp.rm.mpi.mpich2.ui.launch;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.debug.core.ILaunchConfiguration;
import org.eclipse.debug.core.ILaunchConfigurationWorkingCopy;
import org.eclipse.jface.viewers.CheckStateChangedEvent;
import org.eclipse.jface.viewers.ICheckStateListener;
import org.eclipse.ptp.core.attributes.IAttribute;
import org.eclipse.ptp.core.elements.IPQueue;
import org.eclipse.ptp.core.elements.IResourceManager;
import org.eclipse.ptp.launch.ui.extensions.RMLaunchValidation;
import org.eclipse.ptp.rm.mpi.mpich2.ui.MPICH2UIPlugin;
import org.eclipse.ptp.rm.mpi.mpich2.ui.messages.Messages;
import org.eclipse.ptp.rm.ui.launch.AbstractRMLaunchConfigurationDynamicTab;
import org.eclipse.ptp.rm.ui.launch.RMLaunchConfigurationDynamicTabDataSource;
import org.eclipse.ptp.rm.ui.launch.RMLaunchConfigurationDynamicTabWidgetListener;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Image;
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.Control;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;

/**
 * 
 * @author Daniel Felix Ferber
 *
 */
public class AdvancedMPICH2RMLaunchConfigurationDynamicTab extends
AbstractRMLaunchConfigurationDynamicTab {

	Composite control;
	Button useArgsDefaultsButton;
	Text argsText;

	class WidgetListener extends RMLaunchConfigurationDynamicTabWidgetListener
	implements ICheckStateListener {
		public WidgetListener(AbstractRMLaunchConfigurationDynamicTab dynamicTab) {
			super(dynamicTab);
		}

		@Override
		protected void doWidgetSelected(SelectionEvent e) {
			super.doWidgetSelected(e);
		}

		public void checkStateChanged(CheckStateChangedEvent event) {
			// do nothing
		}
	}

	class DataSource extends RMLaunchConfigurationDynamicTabDataSource {
		private boolean useDefArgs;
		private String args;

		protected DataSource(AbstractRMLaunchConfigurationDynamicTab page) {
			super(page);
		}

		@Override
		protected void copyFromFields() throws ValidationException {
			useDefArgs = useArgsDefaultsButton.getSelection();
			args = extractText(argsText);
		}

		@Override
		protected void copyToFields() {
			applyText(argsText, args);
			useArgsDefaultsButton.setSelection(useDefArgs);
		}

		@Override
		protected void copyToStorage() {
			getConfigurationWorkingCopy().setAttribute(
					MPICH2LaunchConfiguration.ATTR_USEDEFAULTARGUMENTS,
					useDefArgs);
			getConfigurationWorkingCopy().setAttribute(
					MPICH2LaunchConfiguration.ATTR_ARGUMENTS, args);
		}

		@Override
		protected void loadDefault() {
			args = MPICH2LaunchConfigurationDefaults.ATTR_ARGUMENTS;
			useDefArgs = MPICH2LaunchConfigurationDefaults.ATTR_USEDEFAULTARGUMENTS;

		}

		@Override
		protected void loadFromStorage() {
			try {
				args = getConfiguration().getAttribute(
						MPICH2LaunchConfiguration.ATTR_ARGUMENTS,
						MPICH2LaunchConfigurationDefaults.ATTR_ARGUMENTS);
				useDefArgs = getConfiguration()
				.getAttribute(
						MPICH2LaunchConfiguration.ATTR_USEDEFAULTARGUMENTS,
						MPICH2LaunchConfigurationDefaults.ATTR_USEDEFAULTARGUMENTS);
			} catch (CoreException e) {
				// TODO handle exception?
				MPICH2UIPlugin.log(e);
			}
		}

		@Override
		protected void validateLocal() throws ValidationException {
			if (!useDefArgs && args == null) {
				throw new ValidationException(
						Messages.AdvancedMPICH2RMLaunchConfigurationDynamicTab_Validation_EmptyArguments);
			}
		}

		/**
		 * Convert a comma separated list into one host per line
		 * 
		 * @param list
		 * @return
		 */
		private String hostListToText(String list) {
			if (list == null)
				return ""; //$NON-NLS-1$
			String result = ""; //$NON-NLS-1$
			String[] values = list.split(","); //$NON-NLS-1$
			for (int i = 0; i < values.length; i++) {
				if (!values[i].equals("")) { //$NON-NLS-1$
					if (i > 0) {
						result += "\r"; //$NON-NLS-1$
					}
					result += values[i];
				}
			}
			return result;
		}
	}

	@Override
	protected RMLaunchConfigurationDynamicTabDataSource createDataSource() {
		return new DataSource(this);
	}

	@Override
	protected RMLaunchConfigurationDynamicTabWidgetListener createListener() {
		return new WidgetListener(this);
	}

	@Override
	public Image getImage() {
		return null;
	}

	@Override
	public String getText() {
		return Messages.AdvancedMPICH2RMLaunchConfigurationDynamicTab_Title;
	}

	public void createControl(Composite parent, IResourceManager rm,
			IPQueue queue) throws CoreException {
		control = new Composite(parent, SWT.NONE);
		control.setLayout(new GridLayout());

		final Group argumentsGroup = new Group(control, SWT.NONE);
		argumentsGroup.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true,
				false));
		GridLayout layout = new GridLayout();
		layout.numColumns = 2;
		argumentsGroup.setLayout(layout);
		argumentsGroup
		.setText(Messages.AdvancedMPICH2RMLaunchConfigurationDynamicTab_Label_LaunchArguments);

		useArgsDefaultsButton = new Button(argumentsGroup, SWT.CHECK);
		useArgsDefaultsButton
		.setText(Messages.AdvancedMPICH2RMLaunchConfigurationDynamicTab_Label_DefaultArguments);
		// useArgsDefaultsButton.setSelection(true);
		GridData gd = new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1);
		useArgsDefaultsButton.setLayoutData(gd);
		useArgsDefaultsButton.addSelectionListener(getListener());

		Label label = new Label(argumentsGroup, SWT.NONE);
		label.setLayoutData(new GridData());
		label
		.setText(Messages.AdvancedMPICH2RMLaunchConfigurationDynamicTab_Label_Arguments);

		argsText = new Text(argumentsGroup, SWT.BORDER);
		argsText.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
	}

	public IAttribute<?, ?, ?>[] getAttributes(IResourceManager rm,
			IPQueue queue, ILaunchConfiguration configuration, String mode)
			throws CoreException {
		return null;
	}

	public Control getControl() {
		return control;
	}

	public RMLaunchValidation setDefaults(
			ILaunchConfigurationWorkingCopy configuration, IResourceManager rm,
			IPQueue queue) {
		configuration.setAttribute(
				MPICH2LaunchConfiguration.ATTR_USEDEFAULTARGUMENTS,
				MPICH2LaunchConfigurationDefaults.ATTR_USEDEFAULTARGUMENTS);
		configuration.setAttribute(MPICH2LaunchConfiguration.ATTR_ARGUMENTS,
				MPICH2LaunchConfigurationDefaults.ATTR_ARGUMENTS);
		return new RMLaunchValidation(true, null);
	}

	@Override
	public void updateControls() {
		argsText.setEnabled(!useArgsDefaultsButton.getSelection());
	}
}