/*******************************************************************************
 * Copyright (c) 2009 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *     Zend Technologies
 *******************************************************************************/
package org.eclipse.php.internal.ui.autoEdit;

import org.apache.commons.lang3.StringUtils;
import org.eclipse.jface.text.*;
import org.eclipse.php.internal.core.format.CurlyCloseIndentationStrategy;
import org.eclipse.php.internal.ui.Logger;
import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocument;

/**
 * @author guy.g
 * 
 */

public class CurlyCloseAutoEditStrategy extends CurlyCloseIndentationStrategy implements IAutoEditStrategy {

	@Override
	public void customizeDocumentCommand(IDocument document, DocumentCommand command) {
		if (command.text != null && command.text.trim().endsWith("}")) { //$NON-NLS-1$
			autoIndentAfterCurlyClose((IStructuredDocument) document, command);
		}
	}

	private StringBuilder helpBuffer = new StringBuilder();

	private void autoIndentAfterCurlyClose(IStructuredDocument document, DocumentCommand command) {
		helpBuffer.setLength(0);
		int currentOffset = command.offset;

		int lineNumber = document.getLineOfOffset(currentOffset);
		try {
			IRegion lineInfo = document.getLineInformation(lineNumber);
			if (isBlanks(document, lineInfo.getOffset(), command.offset)) {
				placeMatchingBlanks(document, helpBuffer, lineNumber, currentOffset);

				// removing the whiteSpaces in the begining of the line
				command.offset = lineInfo.getOffset();
				command.length += (currentOffset - lineInfo.getOffset());
			}

		} catch (BadLocationException e) {
			Logger.logException(e);
		}

		command.text = helpBuffer.toString() + command.text;
	}

	protected static boolean isBlanks(IStructuredDocument document, int startOffset, int endOffset)
			throws BadLocationException {
		return StringUtils.isBlank(document.get(startOffset, endOffset - startOffset));
	}

}