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package org.qas.api.transform;

import org.qas.api.AuthClientException;
import org.qas.api.AuthServiceException;
import org.qas.api.internal.util.json.JsonObject;

import java.util.logging.Logger;

/**
 * JsonErrorUnmarshaller
 *
 * @author Dzung Nguyen
 * @version $Id JsonErrorUnmarshaller 2014-03-27 11:12:30z dungvnguyen $
 * @since 1.0
 */
public class JsonErrorUnmarshaller extends AbstractErrorUnmarshaller {

  private static final Logger LOG = Logger.getLogger(JsonErrorUnmarshaller.class.getName());

  //~ class members ===========================================================
  public JsonErrorUnmarshaller() {}

  protected JsonErrorUnmarshaller(Class exceptionClass) {
    super(exceptionClass);
  }

  public AuthServiceException unmarshall(JsonObject json) throws Exception {
    LOG.info("Unmarshall " + json);
    String message = parseMessage(json);
    String errorCode = parseErrorCode(json);
    String requestId = parseRequestId(json);
    String type = parseType(json);

    if ((null == message || message.isEmpty()) && (null == errorCode || errorCode.isEmpty())) {
      throw new AuthClientException("Neither error message nor error code is found in the error response payload.");
    } else {
      AuthServiceException ase = newException(message);
      ase.setErrorCode(errorCode);
      ase.setRequestId(requestId);

      if ("Client".equals(type)) {
        ase.setErrorType(AuthServiceException.ErrorType.Client);
      } else if ("Server".equals(type)) {
        ase.setErrorType(AuthServiceException.ErrorType.Service);
      } else {
        ase.setErrorType(AuthServiceException.ErrorType.Unknown);
      }

      return ase;
    }
  }

  protected String parseMessage(JsonObject json) throws Exception {
    String message = "";
    if (json.has("message")) {
      message = json.getString("message");
    } else if (json.has("Message")) {
      message = json.getString("Message");
    } else if (json.has("error_description")) {
      message = json.getString("error_description");
    }

    return message;
  }

  protected String parseErrorCode(JsonObject json) throws Exception {
    if (json.has("code")) {
      return json.getString("code");
    } else if (json.has("error")) {
      return json.getString("error");
    }

    return null;
  }

  protected String parseRequestId(JsonObject json) throws Exception {
    if (json.has("request_id")) {
      return json.getString("request_id");
    }

    return null;
  }

  protected String parseType(JsonObject json) throws Exception {
    if (json.has("type")) {
      return json.getString("type");
    }

    return null;
  }
}