/*******************************************************************************
 * Copyright (c) 2001, 2011 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
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *     
 *******************************************************************************/
package org.eclipse.wst.sse.ui.internal.search;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.search.ui.ISearchQuery;
import org.eclipse.search.ui.ISearchResult;
import org.eclipse.search.ui.text.AbstractTextSearchResult;
import org.eclipse.search.ui.text.Match;
import org.eclipse.wst.sse.ui.internal.Logger;


/**
 * Defines a basic search query.  This query does not do anything, it needs to be extended
 * and the <code>{@link #doQuery()}</code> method needs to be overridden to make the query
 * actually be functional.
 *
 */
public class BasicSearchQuery implements ISearchQuery {
	/**
	 * the file we're searching
	 */
	private IFile fFile = null;
	
	/**
	 * The result of this query
	 */
	private AbstractTextSearchResult fResult = null;

	/**
	 * The progress monitor for the query
	 */
	private IProgressMonitor fProgressMonitor = null;

	/**
	 * <p>Construct a new basic query.</p>
	 * 
	 * <p><b>IMPORTANT: </b>It is very important that after
	 * creating the query and <b>before</b> running the query
	 * that you call {@link #setResult(AbstractTextSearchResult)}.
	 * This is not a parameter because typically a search result needs
	 * a reference to its query and thus the query needs to be constructed
	 * before its result object can be set.</p>
	 * 
	 * @param file the file this query will take place on
	 */
	public BasicSearchQuery(IFile file) {
		this.fFile = file;
	}
	
	/**
	 * Runs the query
	 * 
	 * @see org.eclipse.search.ui.ISearchQuery#run(org.eclipse.core.runtime.IProgressMonitor)
	 */
	public IStatus run(IProgressMonitor monitor) {
		fProgressMonitor = monitor;
		return doQuery();
	}
	
	/**
	 * public to avoid synthetic method access from inner class
	 *
	 * @return
	 */
	public IFile getFile() {
		return this.fFile;
	}

	/**
	 * There is no default label for a basic query,
	 * this should be overridden by implementing classes
	 * 
	 * @see org.eclipse.search.ui.ISearchQuery#getLabel()
	 */
	public String getLabel() {
		return ""; //$NON-NLS-1$
	}

	/**
	 * <p>This will be <code>null</code> if {@link #setResult(AbstractTextSearchResult)}
	 * has not been called yet.</p>
	 * 
	 * @see org.eclipse.search.ui.ISearchQuery#getSearchResult()
	 */
	public ISearchResult getSearchResult() {
		return fResult;
	}

	/**
	 * Adds a match to the results of this query.
	 * 
	 * <p><b>IMPORTANT: </b>It is very important that after
	 * creating the query and <b>before</b> running the query
	 * that you call {@link #setResult(AbstractTextSearchResult)}.
	 * This is not a parameter because typically a search result needs
	 * a reference to its query and thus the query needs to be constructed
	 * before its result object can be set.</p>
	 * 
	 * @param document the document the match is being added too
	 * @param matchStart the start character of the match
	 * @param matchEnd the end character of the match
	 */
	public void addMatch(IDocument document, int matchStart, int matchEnd) {

		try {
			int lineNumber = document.getLineOfOffset(matchStart);
			int lineStart = document.getLineOffset(lineNumber);
			int lineLength = document.getLineLength(lineNumber);

			String elementMessage = document.get().substring(lineStart, lineStart + lineLength);
			
			//add the match to the result
				BasicSearchMatchElement element = new BasicSearchMatchElement(fFile, lineNumber, lineStart, elementMessage);
				fResult.addMatch(new Match(element, Match.UNIT_CHARACTER, matchStart, matchEnd - matchStart));
			
		} catch (BadLocationException e) {
			Logger.logException(e);
		}
	}

	/**
	 * <p><i>Note: </i> as of yet no testing has gone into whether this query
	 * can be re-run or not or what that even entails.<p>
	 * 
	 * @see org.eclipse.search.ui.ISearchQuery#canRerun()
	 */
	public boolean canRerun() {
		return false;
	}

	/**
	 * <p>This query can be run in the background</p>
	 * 
	 * @see org.eclipse.search.ui.ISearchQuery#canRunInBackground()
	 */
	public boolean canRunInBackground() {
		return true;
	}
	
	/**
	 * <p>The actual work of the query, called by {@link #run(IProgressMonitor)}</p>
	 * <p><i>Note: </i>This method should be overridden by implementers so that their query
	 * will actually do something</p>
	 * 
	 * @return the status of the query when it has finished
	 * 
	 * @deprecated use {@link #doQuery(IProgressMonitor)} so that the operation is cancelable
	 */
	protected IStatus doQuery() {
		return doQuery(fProgressMonitor);
	}
	
	/**
	 * <p>The actual work of the query, called by {@link #run(IProgressMonitor)}</p>
	 * <p><i>Note: </i>This method should be overridden by implementers so that their query
	 * will actually do something</p>
	 * 
	 * @param monitor {@link IProgressMonitor} used to track progress and cancel the operation
	 * 
	 * @return the status of the query when it has finished
	 */
	protected IStatus doQuery(IProgressMonitor monitor) {
		return Status.OK_STATUS;
	}
	
	/**
	 * @return the total number of matches this query found
	 */
	protected int getMatchCount() {
		return fResult.getMatchCount();
	}
	
	/**
	 * <p>used in search result display labels, should be overridden by implementers</p>
	 * 
	 * @return
	 */
	protected String getSearchText() {
		return ""; //$NON-NLS-1$
	}
	
	/**
	 * <p>This <b>needs</b> to be called after constructing
	 * the query but before running it, see note on {@link #BasicSearchQuery(IFile)}</p>
	 * 
	 * @param result the result this query will use to store its results
	 */
	protected void setResult(AbstractTextSearchResult result) {
		this.fResult = result;
	}
}