package org.jboss.resteasy.plugins.providers;

import org.jboss.resteasy.resteasy_jaxrs.i18n.LogMessages;
import org.jboss.resteasy.spi.AsyncMessageBodyWriter;
import org.jboss.resteasy.spi.AsyncOutputStream;
import org.jboss.resteasy.util.MediaTypeHelper;
import org.jboss.resteasy.util.NoContent;
import org.jboss.resteasy.util.ReadFromStream;

import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.concurrent.CompletionStage;

/**
 * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
 * @version $Revision: 1 $
 */
@Provider
@Produces("*/*")
@Consumes("*/*")
public class ByteArrayProvider implements MessageBodyReader<byte[]>, AsyncMessageBodyWriter<byte[]>
{
   public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType)
   {
      return type.isArray() && type.getComponentType().equals(byte.class);
   }

   public byte[] readFrom(Class<byte[]> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, String> httpHeaders, InputStream entityStream) throws IOException
   {
      LogMessages.LOGGER.debugf("Provider : %s,  Method : readFrom", getClass().getName());
      if (NoContent.isContentLengthZero(httpHeaders)) return new byte[0];
      return ReadFromStream.readFromStream(1024, entityStream);
   }

   public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType)
   {
      return type.isArray() && type.getComponentType().equals(byte.class) && !MediaTypeHelper.isBlacklisted(mediaType);
   }

   public long getSize(byte[] bytes, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType)
   {
      return bytes.length;
   }

   public void writeTo(byte[] bytes, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException
   {
      LogMessages.LOGGER.debugf("Provider : %s,  Method : writeTo", getClass().getName());
      entityStream.write(bytes);
   }

   @Override
   public CompletionStage<Void> asyncWriteTo(byte[] bytes, Class<?> type, Type genericType, Annotation[] annotations,
                                             MediaType mediaType, MultivaluedMap<String, Object> httpHeaders,
                                             AsyncOutputStream entityStream)
   {
      LogMessages.LOGGER.debugf("Provider : %s,  Method : writeTo", getClass().getName());
      return entityStream.asyncWrite(bytes);
   }
}
