/**
 * Licensed to jclouds, Inc. (jclouds) under one or more
 * contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  jclouds 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.jclouds.rest.binders;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static org.jclouds.io.Payloads.newStringPayload;

import java.net.URI;
import java.util.Map;

import javax.inject.Inject;
import javax.inject.Provider;
import javax.inject.Singleton;
import javax.ws.rs.core.UriBuilder;

import org.jclouds.http.HttpRequest;
import org.jclouds.rest.MapBinder;
import org.jclouds.rest.annotations.Payload;
import org.jclouds.rest.internal.GeneratedHttpRequest;

/**
 * 
 * @author Adrian Cole
 */
@Singleton
public class BindMapToStringPayload implements MapBinder {
   protected final Provider<UriBuilder> uriBuilders;

   @Inject
   public BindMapToStringPayload(Provider<UriBuilder> uriBuilders) {
      this.uriBuilders = checkNotNull(uriBuilders, "uriBuilders");
   }

   @SuppressWarnings("unchecked")
   @Override
   public <R extends HttpRequest> R bindToRequest(R request, Map<String, String> postParams) {
      checkNotNull(postParams, "postParams");
      GeneratedHttpRequest<?> r = GeneratedHttpRequest.class.cast(checkNotNull(request, "request"));
      checkArgument(r.getJavaMethod().isAnnotationPresent(Payload.class),
            "method %s must have @Payload annotation to use this binder", r.getJavaMethod());
      String payload = r.getJavaMethod().getAnnotation(Payload.class).value();
      if (postParams.size() > 0) {
         UriBuilder builder = uriBuilders.get();
         builder.uri(URI.create("http://fake/"));
         builder.path(payload);
         URI fake = builder.buildFromMap(postParams);
         payload = fake.getPath().substring(1);
      }
      return (R) request.toBuilder().payload(newStringPayload(payload)).build();
   }

   @Override
   public <R extends HttpRequest> R bindToRequest(R request, Object payload) {
      throw new IllegalArgumentException("this is a map binder");
   }

}