/*******************************************************************************
 * Copyright (c) 2000, 2005 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
 *******************************************************************************/
package org.eclipse.wst.common.ui.internal.search;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.IResourceDeltaVisitor;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.MultiStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.search.internal.ui.Messages;
import org.eclipse.search.internal.ui.SearchMessages;
import org.eclipse.search.ui.IQueryListener;
import org.eclipse.search.ui.ISearchQuery;
import org.eclipse.search.ui.ISearchResult;
import org.eclipse.search.ui.NewSearchUI;
import org.eclipse.search.ui.text.Match;
import org.eclipse.wst.common.core.search.SearchEngine;
import org.eclipse.wst.common.core.search.pattern.QualifiedName;
import org.eclipse.wst.common.core.search.pattern.SearchPattern;
import org.eclipse.wst.common.core.search.scope.SearchScope;


public abstract class AbstractSearchQuery implements ISearchQuery {
	
	protected String fPattern;
	protected SearchScope fScope;
	protected SearchResult fResult;
	protected String fScopeDescription;

	public AbstractSearchQuery(String pattern, SearchScope scope, String scopeDescription) {
		super();
		fPattern= pattern;
		fScope= scope;
		fScopeDescription= scopeDescription;
	}

	public boolean canRerun() {
		// TODO Auto-generated method stub
		return false;
	}

	public boolean canRunInBackground() {
		return true;
	}

	public String getLabel() {
		return SearchMessages.FileSearchQuery_label; 
	}

	public ISearchResult getSearchResult() {
		if (fResult == null) {
			fResult= new SearchResult(this);
			new SearchResultUpdater(fResult);
		}
		return fResult;
	}
	
	public String getResultLabel(int nMatches) {
		if (nMatches == 1) {
			if (fPattern.length() > 0) {
				Object[] args= { fPattern, fScopeDescription };
				return Messages.format(SearchMessages.FileSearchQuery_singularLabel, args); 
			}
			Object[] args= { "", fScopeDescription };
			return Messages.format(SearchMessages.FileSearchQuery_singularLabel_fileNameSearch, args); 
		}
		if (fPattern.length() > 0) {
			Object[] args= { fPattern, new Integer(nMatches), fScopeDescription }; //$NON-NLS-1$
			return Messages.format(SearchMessages.FileSearchQuery_pluralPattern, args); 
		}
		Object[] args= { "", new Integer(nMatches), fScopeDescription }; //$NON-NLS-1$
		return Messages.format(SearchMessages.FileSearchQuery_pluralPattern_fileNameSearch, args); 
	
	
	}

	public IStatus run(IProgressMonitor pm) throws OperationCanceledException {
		final SearchResult textResult= (SearchResult) getSearchResult();
		textResult.removeAll();
		SearchQueryResultCollector collector= new SearchQueryResultCollector(textResult);
		String searchString= fPattern;
		if (searchString.trim().equals(String.valueOf('*'))) {
			searchString= new String();
		}
		String message= SearchMessages.TextSearchEngine_statusMessage; 
		MultiStatus status= new MultiStatus(NewSearchUI.PLUGIN_ID, IStatus.OK, message, null);
		
		SearchEngine searchEngine = new SearchEngine();
	
		QualifiedName typeName = QualifiedName.valueOf(searchString);
		
		try {
            SearchPattern pattern = createSearchPattern(typeName);
            searchEngine.search(pattern, collector, fScope, null, new NullProgressMonitor());
		} catch (CoreException e) {
			status.add(e.getStatus());
		}
	
		return status;

	}
    
    protected abstract SearchPattern createSearchPattern(QualifiedName typeName);
	
	public class SearchResultUpdater implements IResourceChangeListener, IQueryListener {
		SearchResult fResult;

		public SearchResultUpdater(SearchResult result) {
			fResult= result;
			NewSearchUI.addQueryListener(this);
			ResourcesPlugin.getWorkspace().addResourceChangeListener(this);
		}

		public void resourceChanged(IResourceChangeEvent event) {
			IResourceDelta delta= event.getDelta();
			if (delta != null)
				handleDelta(delta);
		}

		protected void handleDelta(IResourceDelta d) {
			try {
				d.accept(new IResourceDeltaVisitor() {
					public boolean visit(IResourceDelta delta) throws CoreException {
						switch (delta.getKind()) {
							case IResourceDelta.ADDED :
								return false;
							case IResourceDelta.REMOVED :
								IResource res= delta.getResource();
								if (res instanceof IFile) {
									Match[] matches= fResult.getMatches(res);
									fResult.removeMatches(matches);
								}
								break;
							case IResourceDelta.CHANGED :
								// handle changed resource
								break;
						}
						return true;
					}
				});
			} catch (CoreException e) {
				e.printStackTrace();
			}
		}

		public void queryAdded(ISearchQuery query) {
			// don't care
		}

		public void queryRemoved(ISearchQuery query) {
			if (fResult.equals(query.getSearchResult())) {
				ResourcesPlugin.getWorkspace().removeResourceChangeListener(this);
				NewSearchUI.removeQueryListener(this);
			}
		}
		
		public void queryStarting(ISearchQuery query) {
			// don't care
		}

		public void queryFinished(ISearchQuery query) {
			// don't care
		}
    }	
}