/*
 * Copyright 2013 Netflix, Inc.
 *
 * Licensed 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 feign.ribbon;

import com.netflix.client.AbstractLoadBalancerAwareClient;
import com.netflix.client.ClientException;
import com.netflix.client.ClientRequest;
import com.netflix.client.IResponse;
import com.netflix.client.RequestSpecificRetryHandler;
import com.netflix.client.RetryHandler;
import com.netflix.client.config.CommonClientConfigKey;
import com.netflix.client.config.IClientConfig;
import com.netflix.loadbalancer.ILoadBalancer;

import java.io.IOException;
import java.net.URI;
import java.util.Collection;
import java.util.Map;

import feign.Client;
import feign.Request;
import feign.RequestTemplate;
import feign.Response;

public final class LBClient extends
    AbstractLoadBalancerAwareClient<LBClient.RibbonRequest, LBClient.RibbonResponse> {

  private final int connectTimeout;
  private final int readTimeout;
  private final IClientConfig clientConfig;

  public static LBClient create(ILoadBalancer lb, IClientConfig clientConfig) {
    return new LBClient(lb, clientConfig);
  }

  LBClient(ILoadBalancer lb, IClientConfig clientConfig) {
    super(lb, clientConfig);
    this.clientConfig = clientConfig;
    connectTimeout = clientConfig.get(CommonClientConfigKey.ConnectTimeout);
    readTimeout = clientConfig.get(CommonClientConfigKey.ReadTimeout);
  }

  @Override
  public RibbonResponse execute(RibbonRequest request, IClientConfig configOverride)
      throws IOException {
    Request.Options options;
    if (configOverride != null) {
      options =
          new Request.Options(
              configOverride.get(CommonClientConfigKey.ConnectTimeout, connectTimeout),
              (configOverride.get(CommonClientConfigKey.ReadTimeout, readTimeout)));
    } else {
      options = new Request.Options(connectTimeout, readTimeout);
    }
    Response response = request.client().execute(request.toRequest(), options);
    return new RibbonResponse(request.getUri(), response);
  }

  @Override
  public RequestSpecificRetryHandler getRequestSpecificRetryHandler(
      RibbonRequest request, IClientConfig requestConfig) {
    if (clientConfig.get(CommonClientConfigKey.OkToRetryOnAllOperations, false)) {
      return new RequestSpecificRetryHandler(true, true, this.getRetryHandler(), requestConfig);
    }
    if (!request.toRequest().method().equals("GET")) {
      return new RequestSpecificRetryHandler(true, false, this.getRetryHandler(), requestConfig);
    } else {
      return new RequestSpecificRetryHandler(true, true, this.getRetryHandler(), requestConfig);
    }
  }

  static class RibbonRequest extends ClientRequest implements Cloneable {

    private final Request request;
    private final Client client;

    RibbonRequest(Client client, Request request, URI uri) {
      this.client = client;
      this.request = request;
      setUri(uri);
    }

    Request toRequest() {
      return new RequestTemplate()
          .method(request.method())
          .append(getUri().toASCIIString())
          .headers(request.headers())
          .body(request.body(), request.charset())
          .request();
    }

    Client client() {
      return client;
    }

    public Object clone() {
      return new RibbonRequest(client, request, getUri());
    }
  }

  static class RibbonResponse implements IResponse {

    private final URI uri;
    private final Response response;

    RibbonResponse(URI uri, Response response) {
      this.uri = uri;
      this.response = response;
    }

    @Override
    public Object getPayload() throws ClientException {
      return response.body();
    }

    @Override
    public boolean hasPayload() {
      return response.body() != null;
    }

    @Override
    public boolean isSuccess() {
      return response.status() == 200;
    }

    @Override
    public URI getRequestedURI() {
      return uri;
    }

    @Override
    public Map<String, Collection<String>> getHeaders() {
      return response.headers();
    }

    Response toResponse() {
      return response;
    }

    @Override
    public void close() throws IOException {
      if (response != null && response.body() != null) {
        response.body().close();
      }
    }

  }

}

@@ -1106,26 +1106,77 @@
 va.util.
-Collection
+Arrays;%0Aimport java.util.Collection;%0Aimport java.util.HashMap
 ;%0Aimport
@@ -1287,16 +1287,35 @@
 esponse;
+%0Aimport feign.Util;
 %0A%0Apublic
@@ -3515,135 +3515,361 @@
     
-return new RequestTemplate
+// add header %22Content-Length%22 according to the request body%0A      final byte%5B%5D body = request.body
 ()
+;
 %0A      
-    .method(request.method())%0A          .append(getUri().toASCII
+final int bodyLength = body != null ? body.length : 0;%0A      // create a new Map to avoid side effect, not to change the old headers%0A      Map%3CString, Collection%3CString%3E%3E headers = new HashMap%3CString, Collection%3C
 String
+%3E%3E
 ()
-)
+;
 %0A      
-    .
 headers
+.putAll
 (req
@@ -3887,79 +3887,197 @@
 s())
+;
 %0A
-  
       
-  .body(request.body(), request.charset())%0A          .request(
+headers.put(Util.CONTENT_LENGTH, Arrays.asList(String.valueOf(bodyLength)));%0A      return Request.create(request.method(), getUri().toASCIIString(), headers, body, request.charset()
 );%0A 

support the query values starting with '{', when use RibbonClient, by using Request.create()