//docParser.java 
//------------------------
//part of YaCy
//(C) by Michael Peter Christen; mc@yacy.net
//first published on http://www.anomic.de
//Frankfurt, Germany, 2005
//
//this file is contributed by Martin Thelian
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
//This program is free software; you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation; either version 2 of the License, or
//(at your option) any later version.
//
//This program 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 General Public License for more details.
//
//You should have received a copy of the GNU General Public License
//along with this program; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

package net.yacy.document.parser;

import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.HashSet;
import java.util.Set;

import net.yacy.document.AbstractParser;
import net.yacy.document.Document;
import net.yacy.document.Idiom;
import net.yacy.document.ParserException;
import net.yacy.kelondro.data.meta.DigestURI;

import org.apache.poi.hwpf.extractor.WordExtractor;

public class docParser extends AbstractParser implements Idiom {

    /**
     * a list of mime types that are supported by this parser class
     * @see #getSupportedMimeTypes()
     */    
    public static final Set<String> SUPPORTED_MIME_TYPES = new HashSet<String>();
    public static final Set<String> SUPPORTED_EXTENSIONS = new HashSet<String>();
    static {
        SUPPORTED_EXTENSIONS.add("doc");
        SUPPORTED_MIME_TYPES.add("application/msword");
        SUPPORTED_MIME_TYPES.add("application/doc");
        SUPPORTED_MIME_TYPES.add("appl/text");
        SUPPORTED_MIME_TYPES.add("application/vnd.msword");
        SUPPORTED_MIME_TYPES.add("application/vnd.ms-word");
        SUPPORTED_MIME_TYPES.add("application/winword");
        SUPPORTED_MIME_TYPES.add("application/word");
        SUPPORTED_MIME_TYPES.add("application/x-msw6");
        SUPPORTED_MIME_TYPES.add("application/x-msword");
    }
    
	public docParser() {
		super("Word Document Parser");
	}

	public Document parse(final DigestURI location, final String mimeType, final String charset, final InputStream source) throws ParserException, InterruptedException {

        final WordExtractor extractor;

        try {
            extractor = new WordExtractor(source);
        } catch (Exception e) {
            throw new ParserException("error in docParser, WordTextExtractorFactory: " + e.getMessage(), location);
        }

		StringBuilder contents = new StringBuilder();
        try {
            contents.append(extractor.getText().trim());
            contents.append(" ");
            contents.append(extractor.getHeaderText());
            contents.append(" ");
            contents.append(extractor.getFooterText());
        } catch (Exception e) {
            throw new ParserException("error in docParser, getText: " + e.getMessage(), location);
        }
	    String title = (contents.length() > 240) ? contents.substring(0,240) : contents.toString().trim();
        title.replaceAll("\r"," ").replaceAll("\n"," ").replaceAll("\t"," ").trim();
	    if (title.length() > 80) title = title.substring(0, 80);
	    int l = title.length();
	    while (true) {
	        title = title.replaceAll("  ", " ");
	        if (title.length() == l) break;
	        l = title.length();
	    }

        Document theDoc;
        try {
            theDoc = new Document(
                      location,
                      mimeType,
                      "UTF-8",
                      null,
                      null,
                      title,
                      "", // TODO: AUTHOR
                      extractor.getDocSummaryInformation().getCompany(), // publisher
                      null,
                      null,
                      contents.toString().getBytes("UTF-8"),
                      null,
                      null,
                      false);
        } catch (UnsupportedEncodingException e) {
            throw new ParserException("error in docParser, getBytes: " + e.getMessage(), location);
        }
          
        return theDoc;
	}

	public Set<String> supportedMimeTypes() {
        return SUPPORTED_MIME_TYPES;
    }
    
    public Set<String> supportedExtensions() {
        return SUPPORTED_EXTENSIONS;
    }

    @Override
	public void reset() {
        // Nothing todo here at the moment
        super.reset();
	}

}