/*******************************************************************************
* Copyright (c) 2012, 2013 Ericsson
 *
 * 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:
 *   Patrick Tasse - Initial API and implementation
 *******************************************************************************/

package fr.inria.linuxtools.internal.tmf.ui.project.handlers;

import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.NotEnabledException;
import org.eclipse.core.commands.NotHandledException;
import org.eclipse.core.commands.common.NotDefinedException;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.handlers.IHandlerService;

import fr.inria.linuxtools.internal.tmf.ui.Activator;
import fr.inria.linuxtools.tmf.ui.project.model.TmfAnalysisOutputElement;
import fr.inria.linuxtools.tmf.ui.project.model.TmfExperimentElement;
import fr.inria.linuxtools.tmf.ui.project.model.TmfProjectModelElement;
import fr.inria.linuxtools.tmf.ui.project.model.TmfTraceElement;

/**
 * <b><u>OpenAction</u></b>
 */
public class OpenAction extends Action {

    private static final String OPEN_COMMAND_ID = "org.eclipse.ui.navigate.openResource"; //$NON-NLS-1$

    private final IWorkbenchPage page;
    private final ISelectionProvider selectionProvider;
    private TmfProjectModelElement element;

    /**
     * Default constructor
     * @param page the workbench page
     * @param selectionProvider the selection provider
     */
    public OpenAction(IWorkbenchPage page, ISelectionProvider selectionProvider) {
        this.page = page;
        this.selectionProvider = selectionProvider;
    }

    @Override
    public boolean isEnabled() {
        ISelection selection = selectionProvider.getSelection();
        if (!selection.isEmpty()) {
            IStructuredSelection sSelection = (IStructuredSelection) selection;
            if (sSelection.size() == 1) {
                if (sSelection.getFirstElement() instanceof TmfTraceElement ||
                        sSelection.getFirstElement() instanceof TmfExperimentElement ||
                        sSelection.getFirstElement() instanceof TmfAnalysisOutputElement) {
                    element = (TmfProjectModelElement) sSelection.getFirstElement();
                    return true;
                }
            }
        }
        return false;
    }

    @Override
    public void run() {
        try {
            IHandlerService handlerService = (IHandlerService) page.getActivePart().getSite().getService(IHandlerService.class);
            boolean executeCommand = ((element instanceof TmfTraceElement) || (element instanceof TmfAnalysisOutputElement));

            if (!executeCommand && element instanceof TmfExperimentElement) {
                TmfExperimentElement experiment = (TmfExperimentElement) element;
                executeCommand = (experiment.getTraces().size() > 0);
            }

            if (executeCommand) {
                handlerService.executeCommand(OPEN_COMMAND_ID, null);
            }
        } catch (ExecutionException e) {
            Activator.getDefault().logError("Error opening resource " + element.getName(), e); //$NON-NLS-1$
        } catch (NotDefinedException e) {
            Activator.getDefault().logError("Error opening resource " + element.getName(), e); //$NON-NLS-1$
        } catch (NotEnabledException e) {
            Activator.getDefault().logError("Error opening resource " + element.getName(), e); //$NON-NLS-1$
        } catch (NotHandledException e) {
            Activator.getDefault().logError("Error opening resource " + element.getName(), e); //$NON-NLS-1$
        }
    }

}