/**
 * 
 */
package org.eclipse.wst.jsdt.web.ui.actions;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.ui.IPageLayout;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.part.ISetSelectionTarget;
import org.eclipse.wst.jsdt.core.IJavaElement;
import org.eclipse.wst.jsdt.internal.ui.util.ExceptionHandler;

/**
 * @author childsb
 * 
 */
public class ShowHistoryAction extends JsElementActionProxy {
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.IActionDelegate#run(org.eclipse.jface.action.IAction)
	 */
	private IResource getHostResource(IJavaElement virtualElement) {
		IProject project = virtualElement.getJavaProject().getProject();
		IPath path = new Path(virtualElement.getHostPath().getPath());
		IResource host = project.getWorkspace().getRoot().findMember(path);
		return host;
	}
	
	
	public void run(IAction action) {
		IJavaElement elements[] = JsElementActionProxy.getJsElementsFromSelection(getCurrentSelection());
		if (elements == null || elements.length == 0) {
			return;
		}
		IResource resource = null;
		if (elements[0].isVirtual()) {
			resource = getHostResource(elements[0]);
		} else {
			resource = elements[0].getResource();
		}
		if (resource == null) {
			return;
		}
		try {
			IWorkbenchPage page = targetWorkbenchPart.getSite().getPage();
			IViewPart view = page.showView(IPageLayout.ID_RES_NAV);
			if (view instanceof ISetSelectionTarget) {
				ISelection selection = new StructuredSelection(resource);
				((ISetSelectionTarget) view).selectReveal(selection);
			}
		} catch (PartInitException e) {
			ExceptionHandler.handle(e, targetWorkbenchPart.getSite().getShell(), "Error Opening in Script View", "Error while displaying element in Script View:\n" + e);
		}
	}
	
	
	public void selectionChanged(IAction action, ISelection selection) {
		setSelection(selection);
		IJavaElement elements[] = JsElementActionProxy.getJsElementsFromSelection(getCurrentSelection());
		for (int i = 0; i < elements.length; i++) {
			if (elements[i].isVirtual()) {
				IResource resource = getHostResource(elements[i]);
				if (resource == null || !resource.exists()) {
					action.setEnabled(false);
				}
			}
		}
	}
}