/*
 * FindBugs - Find bugs in Java programs
 * Copyright (C) 2003-2005 University of Maryland
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import org.dom4j.Document;
import org.dom4j.io.DocumentSource;

public class HTMLBugReporter extends BugCollectionBugReporter {
	private String stylesheet;
	private Exception fatalException;
	
	public HTMLBugReporter(Project project, String stylesheet) {
		super(project);
		this.stylesheet = stylesheet;
	}

	@Override
	public void finish() {
		try {
			BugCollection bugCollection = getBugCollection();
			bugCollection.setWithMessages(true);
			// Decorate the XML with messages to display
			Document document = bugCollection.toDocument(getProject());
			// new AddMessages(bugCollection, document).execute();

			// Get the stylesheet as a StreamSource.
			// First, try to load the stylesheet from the filesystem.
			// If that fails, try loading it as a resource.
			InputStream xslInputStream = getStylesheetStream(stylesheet);
			StreamSource xsl = new StreamSource(xslInputStream);
			xsl.setSystemId(stylesheet);

			// Create a transformer using the stylesheet
			TransformerFactory factory = TransformerFactory.newInstance();
			Transformer transformer = factory.newTransformer(xsl);

			// Source document is the XML generated from the BugCollection
			DocumentSource source = new DocumentSource(document);

			// Write result to output stream
			StreamResult result = new StreamResult(outputStream);

			// Do the transformation
			transformer.transform(source, result);
		} catch (Exception e) {
			logError("Could not generate HTML output", e);
			fatalException = e;
			if (FindBugs.DEBUG) e.printStackTrace();
		}
	}

	public Exception getFatalException() {
		return fatalException;
	}
	private static InputStream getStylesheetStream(String stylesheet) throws IOException {
		if (FindBugs.DEBUG) System.out.println("Attempting to load stylesheet " + stylesheet);
		try {
			URL u = new URL(stylesheet);
			return u.openStream();
		} catch (Exception e) {
			assert true; // ignore it
		}
		try {
			return  new BufferedInputStream(new FileInputStream(stylesheet));
		} catch (Exception fnfe) {
			assert true; // ignore it
		}
		InputStream xslInputStream = HTMLBugReporter.class.getResourceAsStream("/"+stylesheet);
		if (xslInputStream == null) {
			throw new IOException("Could not load HTML generation stylesheet " +  stylesheet);
		}
		return xslInputStream;
	}
}

// vim:ts=4
