package no.uio.ifi.refaktor.handlers;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ITreeSelection;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.handlers.HandlerUtil;

public class TreeSelectionInfoHandler extends AbstractHandler {

	@Override
	public Object execute(ExecutionEvent event) throws ExecutionException {
		ISelection selection = HandlerUtil.getCurrentSelectionChecked(event);
		IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindowChecked(event);
		String title = "Tree Selection Info";

		if (!(selection instanceof ITreeSelection)) {
			MessageDialog.openInformation(window.getShell(), title, "Selection is not of type " + ITreeSelection.class.getCanonicalName());
			return null;
		}


		ITreeSelection treeSelection = (ITreeSelection) selection;
		String message = "Selection type: " + treeSelection.getClass().getCanonicalName()
				+ "\n\nType of selected element: " + treeSelection.getFirstElement().getClass().getCanonicalName()
				+ "\nInterface type(s) for element:\n" + getAdditionalTypeInfoForElement(treeSelection.getFirstElement());

		MessageDialog.openInformation(window.getShell(), title, message);
		return null;
	}

	private String getAdditionalTypeInfoForElement(Object element) {
		String interfaces = "";
		for (Class<?> iface: element.getClass().getInterfaces())
			interfaces += iface.getCanonicalName() + "\n";
		return interfaces;
	}

}