/**
 * Copyright 2017 ZTE Corporation.
 *
 * 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 org.onap.workflow.activitiext.restservicetask;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;

/**
 * This static-class eases HTTP-method execution by self-managed fault-handling and automated
 * Response-information processing
 */
public class LowLevelRestApi {

  // Local HttpClient used for every communication (Singleton implementation)
  private static HttpClient httpClient = new HttpClient();


  /**
   * Executes a passed HttpMethod (Method type is either PUT, POST, GET or DELETE) and returns a
   * HttpResponseMessage
   * 
   * @param method Method to execute
   * @return HttpResponseMessage which contains all information about the execution
   */
  public static HttpResponseMessage executeHttpMethod(HttpMethod method) {

    HttpResponseMessage responseMessage = null;

    try {

      // Execute Request
      LowLevelRestApi.httpClient.executeMethod(method);
      responseMessage = LowLevelRestApi.extractResponseInformation(method);

    } catch (Exception e) {
      e.printStackTrace();
    } finally {

      // Release Connection anyway
      method.releaseConnection();
    }

    // Extract response information and return
    return responseMessage;
  }

  /**
   * Extracts the response information from an executed HttpMethod
   * 
   * @param method Executed Method
   * @return Packaged response information
   */
  private static HttpResponseMessage extractResponseInformation(HttpMethod method) {
    // Create and return HttpResponseMethod
    HttpResponseMessage responseMessage = new HttpResponseMessage();
    responseMessage.setStatusCode(method.getStatusCode());
    try {
      responseMessage.setResponseBody(method.getResponseBodyAsString());
    } catch (Exception e) {
      e.printStackTrace();
    }
    return responseMessage;

  }

}