package no.uio.ifi.refaktor.handlers;

import static no.uio.ifi.refaktor.RefaktorAssert.assertThat;
import static org.hamcrest.CoreMatchers.instanceOf;
import no.uio.ifi.refaktor.changers.ProjectWideSearchBasedExtractAndMoveMethodChanger;
import no.uio.ifi.refaktor.changers.RefaktorChanger;
import no.uio.ifi.refaktor.changers.RefaktorChangerException;
import no.uio.ifi.refaktor.utils.RefaktorDebug;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.jdt.core.IJavaProject;
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 ProjectWideSearchBasedExtractAndMoveMethodChangerHandler extends AbstractHandler {

	@Override
	public Object execute(ExecutionEvent event) throws ExecutionException {
		ISelection selection = HandlerUtil.getCurrentSelectionChecked(event);
		IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindowChecked(event);

		assertThat(selection, instanceOf(ITreeSelection.class));
		ITreeSelection treeSelection = (ITreeSelection) selection;
		Object element = treeSelection.getFirstElement();
		assertThat(element, instanceOf(IJavaProject.class));

		RefaktorChanger changer = new ProjectWideSearchBasedExtractAndMoveMethodChanger((IJavaProject) element);
		try {
			changer.checkPreconditions();
			changer.executeChange(new NullProgressMonitor());
			MessageDialog.openInformation(window.getShell(), "no.uio.ifi.refaktor", changer.getClass() + " has been excuted");
			return null;
		} catch (RefaktorChangerException e) {
			RefaktorDebug.log(e);
		} catch (CoreException e) {
			RefaktorDebug.log(e);
		}

		MessageDialog.openInformation(window.getShell(), "no.uio.ifi.refaktor", changer.getClass() + " did not execute correctly");
		return null;
	}
}