/*
 * 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.
 */
package org.apache.servicemix.maven.plugin.jbi;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.servicemix.common.packaging.Consumes;
import org.apache.servicemix.common.packaging.Provides;
import org.codehaus.plexus.util.xml.PrettyPrintXMLWriter;
import org.codehaus.plexus.util.xml.XMLWriter;

/**
 * Helper that is used to write the jbi.xml for a service unit
 * 
 */
public class JbiServiceUnitDescriptorWriter extends AbstractDescriptorWriter {

    private final String encoding;

    public JbiServiceUnitDescriptorWriter(String encoding) {
        this.encoding = encoding;
    }

    public void write(File descriptor, 
                      boolean bc, 
                      String name,
                      String description, 
                      List uris, 
                      List consumes, 
                      List provides) throws JbiPluginException {
        PrintWriter w;
        try {
            w = new PrintWriter(descriptor, encoding);
        } catch (IOException ex) {
            throw new JbiPluginException("Exception while opening file["
                    + descriptor.getAbsolutePath() + "]", ex);
        }

        XMLWriter writer = new PrettyPrintXMLWriter(w, encoding, null);
        writer.startElement("jbi");
        writer.addAttribute("xmlns", "http://java.sun.com/xml/ns/jbi");
        writer.addAttribute("version", "1.0");

        writer.startElement("services");
        writer.addAttribute("binding-component", bc ? "true" : "false");

        // We need to get all the namespaces into a hashmap so we
        // can get the QName output correctly
        Map namespaceMap = getNamespaceMap(provides, consumes);

        // Set-up the namespaces
        for (Iterator iterator = namespaceMap.keySet().iterator(); iterator
                .hasNext();) {
            String key = (String) iterator.next();
            StringBuffer namespaceDecl = new StringBuffer();
            namespaceDecl.append("xmlns:");
            namespaceDecl.append(namespaceMap.get(key));
            writer.addAttribute(namespaceDecl.toString(), key);
        }

        // Put in the provides
        for (Iterator iterator = provides.iterator(); iterator.hasNext();) {
            Provides providesEntry = (Provides) iterator.next();
            writer.startElement("provides");
            addQNameAttribute(writer, "interface-name", providesEntry
                    .getInterfaceName(), namespaceMap);
            addQNameAttribute(writer, "service-name", providesEntry
                    .getServiceName(), namespaceMap);
            addStringAttribute(writer, "endpoint-name", providesEntry
                    .getEndpointName());
            writer.endElement();
        }

        // Put in the consumes
        for (Iterator iterator = consumes.iterator(); iterator.hasNext();) {
            Consumes consumesEntry = (Consumes) iterator.next();
            writer.startElement("consumes");
            addQNameAttribute(writer, "interface-name", consumesEntry
                    .getInterfaceName(), namespaceMap);
            addQNameAttribute(writer, "service-name", consumesEntry
                    .getServiceName(), namespaceMap);
            addStringAttribute(writer, "endpoint-name", consumesEntry
                    .getEndpointName());

            // TODO Handling of LinkType?

            writer.endElement();
        }

        writer.endElement();

        writer.endElement();

        close(w);
    }

    private void close(Writer closeable) {
        if (closeable != null) {
            try {
                closeable.close();
            } catch (Exception e) {
                // TODO: warn
            }
        }
    }

}