/*************************************************************************
 * Copyright 2009-2014 Eucalyptus Systems, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 3 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/.
 *
 * Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
 * CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
 * additional information or have any questions.
 ************************************************************************/
package com.eucalyptus.imaging.manifest;

import java.io.IOException;

import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.log4j.Logger;

import com.eucalyptus.util.EucalyptusCloudException;

public enum ImportImageManifest implements ImageManifest {
  INSTANCE;

  private static Logger LOG = Logger.getLogger(ImportImageManifest.class);

  @Override
  public FileType getFileType() {
    // TODO: return actual type from import manifest
    return FileType.RAW;
  }

  @Override
  public String getPartsPath() {
    return "/manifest/import/parts/part";
  }

  @Override
  public String getPartUrlElement() {
    return "get-url";
  }

  @Override
  public String getDigestElement() {
    return null;
  }

  @Override
  public boolean signPartUrl() {
    return false;
  }

  @Override
  public String getSizePath() {
    return "/manifest/import/size";
  }

  @Override
  public String getManifest(String location, int maximumSize)
      throws EucalyptusCloudException {
    HttpClient client = new HttpClient();
    client.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
        new DefaultHttpMethodRetryHandler());
    GetMethod method = new GetMethod(location);
    String s = null;
    try {
      client.executeMethod(method);
      s = method.getResponseBodyAsString(maximumSize);
      if (s == null) {
        throw new EucalyptusCloudException("Can't download manifest from "
            + location + " content is null");
      }
    } catch (IOException ex) {
      throw new EucalyptusCloudException("Can't download manifest from "
          + location, ex);
    } finally {
      method.releaseConnection();
    }
    return s;
  }

  @Override
  public String getBaseBucket(String location) {
    throw new UnsupportedOperationException();
  }
}