/*******************************************************************************
 * This file is part of the Symfony eclipse plugin.
 * 
 * (c) Robert Gruendler <r.gruendler@gmail.com>
 * 
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 ******************************************************************************/
package com.dubture.symfony.twig.codeassist.context;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jface.text.IDocument;
import org.eclipse.php.internal.core.util.text.TextSequence;

import com.dubture.symfony.core.log.Logger;
import com.dubture.symfony.core.model.ViewPath;
import com.dubture.symfony.core.util.text.SymfonyTextSequenceUtilities;
import com.dubture.symfony.twig.codeassist.strategies.ViewPathCompletionStrategy;
import com.dubture.twig.core.codeassist.context.QuotesContext;
import com.dubture.twig.core.util.text.TwigTextSequenceUtilities;

/**
 * 
 * Checks if a {@link ViewPathCompletionStrategy} can be applied.
 * 
 * This is true if the curser is inside a single string literal, and not in a
 * function parameter.
 *
 * 
 * I haven't found a way yet for a better validation mechanism here.
 * 
 * 
 * @author Robert Gruendler <r.gruendler@gmail.com>
 *
 */
@SuppressWarnings("restriction")
public class ViewPathArgumentContext extends QuotesContext {

	private ViewPath viewPath;

	@Override
	public boolean isValid(IDocument template, int offset, IProgressMonitor monitor) {
		if (!super.isValid(template, offset, monitor)) {
			return false;
		}

		try {

			TextSequence statement = getStatementText();

			if (TwigTextSequenceUtilities.isInFunction(statement)) {
				return false;
			}
			int startOffset = SymfonyTextSequenceUtilities.readViewPathStartIndex(statement);
			String path = getDocument().getText().substring(statement.getOriginalOffset(startOffset), offset);

			if (path != null) {
				viewPath = new ViewPath(path);
				return true;
			}

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

		return false;
	}

	public ViewPath getViewPath() {
		return viewPath;
	}

}