/**
* BigBlueButton open source conferencing system - http://www.bigbluebutton.org/
* 
* Copyright (c) 2012 BigBlueButton Inc. and by respective authors (see below).
*
* This program 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 3.0 of the License, or (at your option) any later
* version.
* 
* BigBlueButton 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 BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
*
*/

package org.bigbluebutton.presentation;

import java.io.File;

import org.apache.commons.io.FilenameUtils;
import org.bigbluebutton.api.messaging.MessagingConstants;
import org.bigbluebutton.api.messaging.MessagingService;
import org.bigbluebutton.presentation.ConversionUpdateMessage.MessageBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.gson.Gson;

public class SupportedDocumentFilter {
	private static Logger log = LoggerFactory.getLogger(SupportedDocumentFilter.class);

	private final MessagingService messagingService;
	
	public SupportedDocumentFilter(MessagingService m) {
		messagingService = m;
	}
	
	public boolean isSupported(UploadedPresentation pres) {
		File presentationFile = pres.getUploadedFile();
		
		/* Get file extension - Perhaps try to rely on a more accurate method than an extension type ? */
		String extension = FilenameUtils.getExtension(presentationFile.getName());
		boolean supported = SupportedFileTypes.isFileSupported(extension);
		notifyProgressListener(supported, pres);
		if (supported) {
			log.info("Received supported file {}", pres.getUploadedFile().getAbsolutePath());
			pres.setFileType(extension);
		}
		else {
		    log.warn("Received not supported file {}", pres.getUploadedFile().getAbsolutePath());
		}
		return supported;
	}
	
	private void notifyProgressListener(boolean supported, UploadedPresentation pres) {
		MessageBuilder builder = new ConversionUpdateMessage.MessageBuilder(pres);
						
		if (supported) {
			builder.messageKey(ConversionMessageConstants.SUPPORTED_DOCUMENT_KEY);
		} else {
			builder.messageKey(ConversionMessageConstants.UNSUPPORTED_DOCUMENT_KEY);
		}
		
		if(messagingService !=null){
			Gson gson= new Gson();
			String updateMsg=gson.toJson(builder.build().getMessage());
			log.debug("sending: "+updateMsg);
			messagingService.send(MessagingConstants.TO_PRESENTATION_CHANNEL, updateMsg);
		} else {
			log.warn("MessagingService has not been set!");
		}
	}
}