/*******************************************************************************
 * 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.core.codeassist.contexts;

import org.eclipse.dltk.core.CompletionRequestor;
import org.eclipse.dltk.core.ISourceModule;
import org.eclipse.php.internal.core.util.text.TextSequence;

import com.dubture.symfony.core.builder.SymfonyNature;
import com.dubture.symfony.core.log.Logger;
import com.dubture.symfony.core.model.EntityAlias;
import com.dubture.symfony.core.util.text.SymfonyTextSequenceUtilities;

@SuppressWarnings("restriction")
public class EntityCompletionContext extends QuoteIdentifierContext {

	private EntityAlias alias;

	@Override
	public boolean isValid(ISourceModule sourceModule, int offset, CompletionRequestor requestor) {

		if (super.isValid(sourceModule, offset, requestor)) {
			try {

				// wrong nature
				if (!sourceModule.getScriptProject().getProject().hasNature(SymfonyNature.NATURE_ID)) {
					return false;
				}

				if (requestor == null || !requestor.getClass().toString().toLowerCase().contains("symfony")) {
					return false;
				}

				TextSequence statementText = getStatementText();
				char nextChar = getNextChar();

				if (nextChar != ' ' && nextChar != '\n' && nextChar != '\'' && nextChar != '"') {
					return false;
				}

				if (SymfonyTextSequenceUtilities.isInEntityFunctionParameter(statementText) > -1) {
					int startOffset = SymfonyTextSequenceUtilities.readViewPathStartIndex(statementText);
					String path = null;

					if (startOffset == -1) {
						path = "";
					} else {
						int original = statementText.getOriginalOffset(startOffset);
						int end = offset;

						if (original >= 0 && end > original) {
							path = statementText.getSource().getFullText().substring(original, end);
						} else
							path = "";
					}

					if (path != null) {
						alias = new EntityAlias(path);
						return true;
					}

					// TODO: check if the containing class is implementing a
					// ContainerAware Interface
					return true;
				}

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

		return false;
	}

	public EntityAlias getAlias() {
		return alias;
	}
}