package org.apache.taverna.scufl2.wfdesc;

/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
*/


import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.Set;

import org.apache.taverna.scufl2.api.container.WorkflowBundle;
import org.apache.taverna.scufl2.api.io.ReaderException;
import org.apache.taverna.scufl2.api.io.WorkflowBundleReader;


public class WfdescReader implements WorkflowBundleReader {

	public static final String APPLICATION_RDF_XML = "application/rdf+xml";
	public static final String TEXT_TURTLE = "text/turtle";
	public static final String TEXT_VND_WF4EVER_WFDESC_TURTLE = "text/vnd.wf4ever.wfdesc+turtle";

	@Override
	public Set<String> getMediaTypes() {
		return Collections.emptySet();
	    //return new HashSet<String>(Arrays.asList(TEXT_VND_WF4EVER_WFDESC_TURTLE, TEXT_TURTLE, APPLICATION_RDF_XML));
	}

	@Override
	public WorkflowBundle readBundle(File bundleFile, String mediaType)
			throws ReaderException, IOException {
		return null;
	}

	@Override
	public WorkflowBundle readBundle(InputStream inputStream, String mediaType)
			throws ReaderException, IOException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public String guessMediaTypeForSignature(byte[] firstBytes) {
		if (firstBytes.length < 100) { 
			return null;
		}
		Charset latin1 = Charset.forName("ISO-8859-1");
		String firstChars = new String(firstBytes, latin1);
		
		String mimeType = null;
		
		if (firstChars.contains("@prefix") || firstChars.contains("@base")) {
//			mimeType = TEXT_TURTLE;
			if (firstChars.contains("http://purl.org/wf4ever/wfdesc")) {
				mimeType = TEXT_VND_WF4EVER_WFDESC_TURTLE;
			}
		}
//		if (firstChars.contains("<") && firstChars.contains(">") && firstChars.contains("xmlns") && firstChars.contains("http://www.w3.org/1999/02/22-rdf-syntax-ns#")) {
//			mimeType = APPLICATION_RDF_XML;
//		}
		return mimeType;
	}

}