/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.internal;

import org.eclipse.jface.action.Action;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.ui.IPerspectiveDescriptor;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.actions.ActionFactory;
import org.eclipse.ui.help.WorkbenchHelp;
import org.eclipse.ui.internal.dialogs.SavePerspectiveDialog;
import org.eclipse.ui.internal.registry.PerspectiveDescriptor;
import org.eclipse.ui.internal.registry.PerspectiveRegistry;

/**
 * Reset the layout within the active perspective.
 */
public class SavePerspectiveAction	
		extends Action 
		implements ActionFactory.IWorkbenchAction {
			
/**
 * The workbench window; or <code>null</code> if this
 * action has been <code>dispose</code>d.
 */
private IWorkbenchWindow workbenchWindow;

/**
 *	Create an instance of this class
 */
public SavePerspectiveAction(IWorkbenchWindow window) {
	super(WorkbenchMessages.getString("SavePerspective.text")); //$NON-NLS-1$
	if (window == null) {
		throw new IllegalArgumentException();
	}
	this.workbenchWindow = window;
	setActionDefinitionId("org.eclipse.ui.window.savePerspective"); //$NON-NLS-1$
	// @issue missing action id
	setToolTipText(WorkbenchMessages.getString("SavePerspective.toolTip")); //$NON-NLS-1$
	setEnabled(false);
	WorkbenchHelp.setHelp(this, IHelpContextIds.SAVE_PERSPECTIVE_ACTION);
}
/* (non-Javadoc)
 * Method declared on IAction.
 */
public void run() {
	if (workbenchWindow == null) {
		// action has been disposed
		return;
	}
	IWorkbenchPage page = workbenchWindow.getActivePage();
	if (page == null) {
		return;
	}
	PerspectiveDescriptor desc = (PerspectiveDescriptor)page.getPerspective();
	if (desc != null) {
		if (desc.isSingleton()) {
			saveSingleton();
		} else {
			saveNonSingleton();
		}
	}
}
/** 
 * Save a singleton over itself.
 */
public void saveSingleton() {
	String [] buttons= new String[] { 
		IDialogConstants.OK_LABEL,
		IDialogConstants.CANCEL_LABEL
	};
	MessageDialog d= new MessageDialog(
		workbenchWindow.getShell(),
		WorkbenchMessages.getString("SavePerspective.overwriteTitle"), //$NON-NLS-1$
		null,
		WorkbenchMessages.getString("SavePerspective.singletonQuestion"),  //$NON-NLS-1$
		MessageDialog.QUESTION,
		buttons,
		0
	);
	if (d.open() == 0) {
		IWorkbenchPage page = workbenchWindow.getActivePage();
		if (page != null) {
			page.savePerspective();
		}
	}
}

/**
 * Save a singleton over the user selection.
 */
public void saveNonSingleton() {
	// Get reg.
	PerspectiveRegistry reg = (PerspectiveRegistry)WorkbenchPlugin.getDefault()
		.getPerspectiveRegistry();

	// Get persp name.
	SavePerspectiveDialog dlg = new SavePerspectiveDialog(workbenchWindow.getShell(), reg);
	IPerspectiveDescriptor description = null;
	IWorkbenchPage page = workbenchWindow.getActivePage();
	if (page != null)
		description = reg.findPerspectiveWithId(page.getPerspective().getId());
	dlg.setInitialSelection(description);
	if (dlg.open() != IDialogConstants.OK_ID) {
		return;
	}

	// Create descriptor.
	PerspectiveDescriptor desc = (PerspectiveDescriptor)dlg.getPersp();
	if (desc == null) {
		String name = dlg.getPerspName();
		desc = reg.createPerspective(name,(PerspectiveDescriptor)description);
		if (desc == null) {
			MessageDialog.openError(dlg.getShell(), WorkbenchMessages.getString("SavePerspective.errorTitle"), //$NON-NLS-1$
				WorkbenchMessages.getString("SavePerspective.errorMessage")); //$NON-NLS-1$
			return;
		}
	}

	// Save state.
	if (page != null) {
		page.savePerspectiveAs(desc);
	}
}

/* (non-Javadoc)
 * Method declared on ActionFactory.IWorkbenchAction.
 */
public void dispose() {
	if (workbenchWindow == null) {
		// already disposed
		return;
	}
	workbenchWindow = null;
}

}