package org.jboss.resteasy.security.smime;

import org.jboss.resteasy.security.BouncyIntegration;
import org.jboss.resteasy.spi.ReaderException;
import org.jboss.resteasy.spi.ResteasyProviderFactory;
import org.jboss.resteasy.util.Types;

import javax.mail.MessagingException;
import javax.mail.internet.MimeBodyPart;
import javax.ws.rs.Consumes;
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.Provider;
import javax.ws.rs.ext.Providers;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.SequenceInputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.nio.charset.StandardCharsets;

/**
 * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
 * @version $Revision: 1 $
 */
@Provider
@Consumes("*/*")
public class EnvelopedReader implements MessageBodyReader<EnvelopedInput>
{
   static
   {
      BouncyIntegration.init();
   }

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

   public EnvelopedInput readFrom(Class<EnvelopedInput> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, String> headers, InputStream entityStream) throws IOException, WebApplicationException
   {
      Class<?> baseType = null;
      Type baseGenericType = null;

      if (genericType != null && genericType instanceof ParameterizedType)
      {
         ParameterizedType param = (ParameterizedType) genericType;
         baseGenericType = param.getActualTypeArguments()[0];
         baseType = Types.getRawType(baseGenericType);
      }
      EnvelopedInputImpl input = new EnvelopedInputImpl();
      input.setType(baseType);
      input.setGenericType(baseGenericType);

      StringBuilder headerString = new StringBuilder();
      if (headers.containsKey("Content-Disposition"))
      {
         headerString.append("Content-Disposition: ").append(headers.getFirst("Content-Disposition")).append("\r\n");
      }
      if (headers.containsKey("Content-Type"))
      {
         headerString.append("Content-Type: ").append(headers.getFirst("Content-Type")).append("\r\n");
      }
      if (headers.containsKey("Content-Transfer-Encoding"))
      {
         headerString.append("Content-Transfer-Encoding: ").append(headers.getFirst("Content-Transfer-Encoding")).append("\r\n");
      }
      headerString.append("\r\n");
      ByteArrayInputStream is = new ByteArrayInputStream(headerString.toString().getBytes(StandardCharsets.UTF_8));
      MimeBodyPart body = null;
      try
      {
         body = new MimeBodyPart(new SequenceInputStream(is, entityStream));
      }
      catch (MessagingException e)
      {
         throw new ReaderException(e);
      }
      Providers providers = ResteasyProviderFactory.getContextData(Providers.class);
      input.setProviders(providers);
      input.setAnnotations(annotations);
      input.setBody(body);
      return input;
   }
}