package org.eclipse.ptp.debug.internal.ui.actions;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.debug.core.model.ISuspendResume;
import org.eclipse.debug.ui.IDebugUIConstants;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.ISelectionListener;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;

/**
 * @author clement
 *
 */
public class RetargetResumeAtLineAction extends RetargetAction {
	private ISelectionListener fSelectionListener = new DebugSelectionListener();
	private ISuspendResume fTargetElement = null;

	class DebugSelectionListener implements ISelectionListener {

		/* (non-Javadoc)
		 * @see org.eclipse.ui.ISelectionListener#selectionChanged(org.eclipse.ui.IWorkbenchPart, org.eclipse.jface.viewers.ISelection)
		 */
		public void selectionChanged(IWorkbenchPart part, ISelection selection) {
			setTargetElement(null);
			if (selection instanceof IStructuredSelection) {
				IStructuredSelection ss = (IStructuredSelection)selection;
				if (ss.size() == 1) {
					Object object = ss.getFirstElement();
					if (object instanceof ISuspendResume) {
						setTargetElement((ISuspendResume)object);
					}
				}
			}
			update();
		}
	}


	/* (non-Javadoc)
	 * @see org.eclipse.ui.IWorkbenchWindowActionDelegate#dispose()
	 */
	public void dispose() {
		fWindow.getSelectionService().removeSelectionListener(IDebugUIConstants.ID_DEBUG_VIEW, fSelectionListener);
		super.dispose();
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.IWorkbenchWindowActionDelegate#init(org.eclipse.ui.IWorkbenchWindow)
	 */
	public void init(IWorkbenchWindow window) {
		super.init(window);
		window.getSelectionService().addSelectionListener(IDebugUIConstants.ID_DEBUG_VIEW, fSelectionListener);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.cdt.debug.internal.ui.actions.RetargetAction#performAction(java.lang.Object, org.eclipse.jface.viewers.ISelection, org.eclipse.ui.IWorkbenchPart)
	 */
	protected void performAction(Object target, ISelection selection, IWorkbenchPart part) throws CoreException {
		((IResumeAtLineTarget)target).resumeAtLine(part, selection, getTargetElement());
	}

	/* (non-Javadoc)
	 * @see org.eclipse.cdt.debug.internal.ui.actions.RetargetAction#getAdapterClass()
	 */
	protected Class getAdapterClass() {
		return IResumeAtLineTarget.class;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.cdt.debug.internal.ui.actions.RetargetAction#canPerformAction(java.lang.Object, org.eclipse.jface.viewers.ISelection, org.eclipse.ui.IWorkbenchPart)
	 */
	protected boolean canPerformAction(Object target, ISelection selection, IWorkbenchPart part) {
		return getTargetElement() != null && ((IResumeAtLineTarget)target).canResumeAtLine(part, selection, getTargetElement());
	}

	protected ISuspendResume getTargetElement() {
		return fTargetElement;
	}

	protected void setTargetElement(ISuspendResume targetElement) {
		fTargetElement = targetElement;
	}
}