/*******************************************************************************
 * 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.core.codeassist.strategies;

import org.apache.commons.lang3.StringUtils;
import org.eclipse.dltk.core.IField;
import org.eclipse.dltk.core.ISourceRange;
import org.eclipse.dltk.core.IType;
import org.eclipse.dltk.core.ModelException;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.php.core.codeassist.ICompletionContext;
import org.eclipse.php.core.codeassist.ICompletionReporter;
import org.eclipse.php.core.codeassist.IElementFilter;
import org.eclipse.php.core.compiler.PHPFlags;
import org.eclipse.php.internal.core.PHPCorePlugin;
import org.eclipse.php.internal.core.codeassist.contexts.AbstractCompletionContext;
import org.eclipse.php.internal.core.codeassist.contexts.NamespaceMemberContext;

/**
 * This strategy completes namespace functions
 * 
 * @author michael
 */
public class NamespaceConstantsStrategy extends NamespaceMembersStrategy {

	public NamespaceConstantsStrategy(ICompletionContext context, IElementFilter elementFilter) {
		super(context, elementFilter);
	}

	public NamespaceConstantsStrategy(ICompletionContext context) {
		super(context);
	}

	public void apply(ICompletionReporter reporter) throws BadLocationException {
		ICompletionContext context = getContext();
		if (!(context instanceof NamespaceMemberContext)) {
			return;
		}

		NamespaceMemberContext concreteContext = (NamespaceMemberContext) context;
		String prefix = concreteContext.getPrefix();
		String suffix = getSuffix(concreteContext);
		ISourceRange replaceRange = getReplacementRange(concreteContext);

		for (IType ns : concreteContext.getNamespaces()) {
			try {
				for (IField field : ns.getFields()) {
					if (!PHPFlags.isConstant(field.getFlags())) {
						continue;
					}
					if (StringUtils.startsWithIgnoreCase(field.getElementName(), prefix)) {
						reporter.reportField(field, suffix, replaceRange, false);
					}
				}
			} catch (ModelException e) {
				PHPCorePlugin.log(e);
			}
		}
	}

	public String getSuffix(AbstractCompletionContext abstractContext) {
		return ""; //$NON-NLS-1$
	}
}