/*=============================================================================#
 # Copyright (c) 2008-2016 Stephan Wahlbrink (WalWare.de) and others.
 # 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:
 #     Stephan Wahlbrink - initial API and implementation
 #=============================================================================*/

package de.walware.statet.r.internal.debug.ui.launcher;

import java.util.List;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;

import de.walware.ecommons.ltk.core.model.ISourceStructElement;
import de.walware.ecommons.ltk.ui.util.LTKSelectionUtil;
import de.walware.ecommons.text.TextUtil;
import de.walware.ecommons.workbench.ui.WorkbenchUIUtil;

import de.walware.statet.r.core.refactoring.RRefactoringAdapter;
import de.walware.statet.r.internal.debug.ui.RLaunchingMessages;
import de.walware.statet.r.launching.RCodeLaunching;


/**
 * Launch shortcut, which submits 
 *  - the current line/selection directly to R (text editor)
 *  - code of selected model element (outline etc.)
 * and does not change the focus by default.
 * 
 * Low requirements: ITextSelection is sufficient
 */
public class SubmitSelectionHandler extends AbstractHandler {
	
	
	public static class AndGotoConsole extends SubmitSelectionHandler {
		
		
		public AndGotoConsole() {
			super(true);
		}
		
	}
	
	
	private final boolean fGotoConsole;
	private RRefactoringAdapter fModelUtil;
	
	
	public SubmitSelectionHandler() {
		this(false); 
	}
	
	protected SubmitSelectionHandler(final boolean gotoConsole) {
		fGotoConsole = gotoConsole;
	}
	
	
	@Override
	public Object execute(final ExecutionEvent event) throws ExecutionException {
		final ISelection selection = WorkbenchUIUtil.getCurrentSelection(event.getApplicationContext());
		
		try {
			// text selection
			if (selection instanceof ITextSelection) {
				final List<String> lines = LaunchShortcutUtil.getSelectedCodeLines(event);
				if (lines != null) {
					RCodeLaunching.runRCodeDirect(lines, fGotoConsole, null);
					return null;
				}
			}
			else
			// selection of model elements
			if (selection instanceof IStructuredSelection) {
				final ISourceStructElement[] elements = LTKSelectionUtil.getSelectedSourceStructElements(selection);
				if (elements != null) {
					if (fModelUtil == null) {
						fModelUtil = new RSourceCodeAdapter();
					}
					final List<String> lines = TextUtil.toLines(
							fModelUtil.getSourceCodeStringedTogether(elements, null) );
					
					RCodeLaunching.runRCodeDirect(lines, fGotoConsole, null);
					return null;
				}
				
				final IFile[] files = LTKSelectionUtil.getSelectedFiles(selection);
				if (files != null) {
					final int last = files.length-1;
					for (int i = 0; i <= last; i++) {
						final List<String> lines = LaunchShortcutUtil.getCodeLines(files[i]);
						
						RCodeLaunching.runRCodeDirect(lines, (i == last) && fGotoConsole, null);
					}
					return null;
				}
			}
		}
		catch (final CoreException e) {
			LaunchShortcutUtil.handleRLaunchException(e,
					RLaunchingMessages.RSelectionLaunch_error_message, event);
			return null;
		}
		
		LaunchShortcutUtil.handleUnsupportedExecution(event);
		return null;
	}
	
}