package org.jboss.resteasy.plugins.providers.multipart;

import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

import javax.ws.rs.Consumes;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
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 javax.ws.rs.ext.Providers;

import org.jboss.resteasy.plugins.providers.multipart.i18n.Messages;
import org.jboss.resteasy.spi.util.Types;

/**
 * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
 * @version $Revision: 1 $
 */
@Provider
@Consumes("multipart/*")
public class ListMultipartReader implements MessageBodyReader<List<?>> {
   protected @Context Providers workers;

   public boolean isReadable(Class<?> type, Type genericType,
         Annotation[] annotations, MediaType mediaType) {
      return type.equals(List.class) && genericType != null
            && genericType instanceof ParameterizedType;
   }

   public List<?> readFrom(Class<List<?>> type, Type genericType,
         Annotation[] annotations, MediaType mediaType,
         MultivaluedMap<String, String> httpHeaders, InputStream entityStream)
         throws IOException, WebApplicationException {
      String boundary = mediaType.getParameters().get("boundary");
      if (boundary == null)
         throw new IOException(Messages.MESSAGES.unableToGetBoundary());

      if (!(genericType instanceof ParameterizedType))
         throw new IllegalArgumentException(Messages.MESSAGES.receivedGenericType(this, genericType, ParameterizedType.class));

      ParameterizedType param = (ParameterizedType) genericType;
      Type baseType = param.getActualTypeArguments()[0];
      Class<?> rawType = Types.getRawType(baseType);

      MultipartInputImpl input = new MultipartInputImpl(mediaType, workers);
      input.parse(entityStream);

      List<Object> list = new ArrayList<Object>();

      for (InputPart part : input.getParts())
         list.add(part.getBody(rawType, baseType));

      if (!InputStream.class.equals(rawType))
      {
         // make sure any temporary files are discarded
         input.close();
      }

      return list;
   }
}
