/*******************************************************************************
 * Copyright (c) 2005, 2016 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
 *
 *******************************************************************************/
package org.eclipse.dltk.ruby.internal.callhierarchy;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.dltk.ast.references.SimpleReference;
import org.eclipse.dltk.core.ICallProcessor;
import org.eclipse.dltk.core.IModelElement;
import org.eclipse.dltk.core.search.IDLTKSearchConstants;
import org.eclipse.dltk.core.search.IDLTKSearchScope;
import org.eclipse.dltk.core.search.SearchEngine;
import org.eclipse.dltk.core.search.SearchMatch;
import org.eclipse.dltk.core.search.SearchParticipant;
import org.eclipse.dltk.core.search.SearchPattern;
import org.eclipse.dltk.core.search.SearchRequestor;

public class RubyCallProcessor implements ICallProcessor {
	public final static int GENERICS_AGNOSTIC_MATCH_RULE = SearchPattern.R_EXACT_MATCH
			| SearchPattern.R_CASE_SENSITIVE | SearchPattern.R_ERASURE_MATCH;

	private SearchEngine searchEngine = new SearchEngine();

	public Map<SimpleReference, IModelElement> process(final IModelElement parent, IModelElement element,
			IDLTKSearchScope scope, IProgressMonitor monitor) {
		final Map<SimpleReference, IModelElement> elements = new HashMap<SimpleReference, IModelElement>();
		SearchRequestor requestor = new SearchRequestor() {

			@Override
			public void acceptSearchMatch(SearchMatch match) {
				if ((match.getAccuracy() != SearchMatch.A_ACCURATE)) {
					return;
				}

				if (match.isInsideDocComment()) {
					return;
				}

				if (match.getElement() != null
						&& match.getElement() instanceof IModelElement) {
					IModelElement member = (IModelElement) match.getElement();
//					ISourceModule module = (ISourceModule) member
//							.getAncestor(IModelElement.SOURCE_MODULE);
					SimpleReference ref = new SimpleReference(
							match.getOffset(), match.getOffset()
									+ match.getLength(), ""); //$NON-NLS-1$
					// try {
					// IModelElement[] e = module.codeSelect(
					// match.getOffset(), match.getLength());
					// for (int j = 0; j < e.length; ++j) {
					// if (e[j].equals(parent)) {
					elements.put(ref, member);
					// }
					// }
					//
					// } catch (ModelException e) {
					// e.printStackTrace();
					// }
				}
			}
		};

		SearchPattern pattern = SearchPattern.createPattern(element,
				IDLTKSearchConstants.REFERENCES, GENERICS_AGNOSTIC_MATCH_RULE,
				scope.getLanguageToolkit());
		try {
			searchEngine
					.search(pattern, new SearchParticipant[] { SearchEngine
							.getDefaultSearchParticipant() }, scope, requestor,
							monitor);
		} catch (CoreException e) {
			e.printStackTrace();
		}
		return elements;
	}
}