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package com.sun.jersey.atom.abdera.impl.provider.entity;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import org.apache.abdera.Abdera;
import org.apache.abdera.model.Document;
import org.apache.abdera.model.Service;
import org.apache.abdera.parser.Parser;

/**
 * JAX-RS Provider for an AtomPub {@link Service} Document instance.
 */
//@Provider
// @Consumes({"application/atomsvc+xml", "application/xml", "text/xml", "application/atomsvc+json", "application/json"})
// Abdera does not yet provide a JSON parser for a Service entity
@Consumes({"application/atomsvc+xml", "application/xml", "text/xml"})
@Produces({"application/atomsvc+xml", "application/xml", "text/xml", "application/atomsvc+json", "application/json"})
public class ServiceProvider implements MessageBodyReader, MessageBodyWriter {

    public long getSize(Service service, Class type, Type genericType,
                        Annotation[] annotations, MediaType mediaType) {
        return -1;
    }

    public boolean isReadable(Class type, Type genericType,
                              Annotation[] annotations, MediaType mediaType) {
        return Service.class.isAssignableFrom(type);
    }

    public boolean isWriteable(Class type, Type genericType,
                               Annotation[] annotations, MediaType mediaType) {
        return Service.class.isAssignableFrom(type);
    }

    public Service readFrom(Class type, Type genericType,
                         Annotation[] annotations, MediaType mediaType,
                         MultivaluedMap headers,
                         InputStream stream) throws IOException, WebApplicationException {
        Parser parser = null;
        if (mediaType.equals(MediaType.APPLICATION_JSON_TYPE) || mediaType.getSubtype().endsWith("+json")) {
            parser = Abdera.getInstance().getParserFactory().getParser("json");
        } else {
            parser = Abdera.getInstance().getParser();
        }
        Document document = parser.parse(stream);
        return document.getRoot();
    }

    public void writeTo(Service service, Class type, Type genericType,
                        Annotation[] annotations, MediaType mediaType,
                        MultivaluedMap headers,
                        OutputStream stream) throws IOException, WebApplicationException {
        if (mediaType.equals(MediaType.APPLICATION_JSON_TYPE) || mediaType.getSubtype().endsWith("+json")) {
//            Writer writer = Abdera.getInstance().getWriterFactory().getWriter("json");
//            writer.writeTo(service, stream);
            service.writeTo("json", stream);
        } else {
            service.writeTo(stream);
        }
    }

}