/*
 * Copyright 2017 Graz University of Technology EAAF-Core Components has been developed in a
 * cooperation between EGIZ, A-SIT Plus, A-SIT, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.2 or - as soon they will be approved by the European
 * Commission - subsequent versions of the EUPL (the "Licence"); You may not use this work except in
 * compliance with the Licence. You may obtain a copy of the Licence at:
 * https://joinup.ec.europa.eu/news/understanding-eupl-v12
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the Licence
 * is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the Licence for the specific language governing permissions and limitations under
 * the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text file for details on the
 * various modules and licenses. The "NOTICE" text file is part of the distribution. Any derivative
 * works that you distribute must include a readable copy of the "NOTICE" text file.
*/

package at.gv.egiz.eaaf.modules.pvp2.idp.impl;

import javax.annotation.PostConstruct;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import at.gv.egiz.eaaf.core.api.IRequest;
import at.gv.egiz.eaaf.core.api.idp.IAction;
import at.gv.egiz.eaaf.core.api.idp.IAuthData;
import at.gv.egiz.eaaf.core.api.idp.slo.SloInformationInterface;
import at.gv.egiz.eaaf.core.api.logging.IRevisionLogger;
import at.gv.egiz.eaaf.modules.pvp2.PvpEventConstants;
import at.gv.egiz.eaaf.modules.pvp2.api.metadata.IPvpMetadataBuilderConfiguration;
import at.gv.egiz.eaaf.modules.pvp2.api.metadata.IPvpMetadataConfigurationFactory;
import at.gv.egiz.eaaf.modules.pvp2.api.utils.IPvp2CredentialProvider;
import at.gv.egiz.eaaf.modules.pvp2.exception.Pvp2MetadataException;
import at.gv.egiz.eaaf.modules.pvp2.impl.builder.PvpMetadataBuilder;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Service;

@Service("pvpMetadataService")
public class MetadataAction implements IAction {

  private static final Logger log = LoggerFactory.getLogger(MetadataAction.class);

  @Autowired
  private IRevisionLogger revisionsLogger;
  @Autowired
  private PvpMetadataBuilder metadatabuilder;
  @Autowired
  private IPvpMetadataConfigurationFactory configFactory;

  private IPvp2CredentialProvider pvpIdpCredentials;

  /**
   * Sets a specific credential provider for PVP S-Profile IDP component.
   *
   * @param pvpIdpCredentials credential provider
   */
  public void setPvpIdpCredentials(final IPvp2CredentialProvider pvpIdpCredentials) {
    this.pvpIdpCredentials = pvpIdpCredentials;

  }

  @Override
  public SloInformationInterface processRequest(final IRequest req,
      final HttpServletRequest httpReq, final HttpServletResponse httpResp,
      final IAuthData authData) throws Pvp2MetadataException {
    try {
      revisionsLogger.logEvent(req, PvpEventConstants.AUTHPROTOCOL_PVP_METADATA);

      // build metadata
      final IPvpMetadataBuilderConfiguration metadataConfig = configFactory
          .generateMetadataBuilderConfiguration(req.getAuthUrlWithOutSlash(), pvpIdpCredentials);

      final String metadataXml = metadatabuilder.buildPvpMetadata(metadataConfig);
      log.trace("METADATA: " + metadataXml);

      final byte[] content = metadataXml.getBytes("UTF-8");
      httpResp.setStatus(HttpServletResponse.SC_OK);
      httpResp.setContentLength(content.length);
      httpResp.setContentType(MediaType.APPLICATION_XML_VALUE);
      httpResp.getOutputStream().write(content);
      return null;

    } catch (final Exception e) {
      log.error("Failed to generate metadata", e);
      throw new Pvp2MetadataException("pvp2.27", null);
    }
  }

  @Override
  public boolean needAuthentication(final IRequest req, final HttpServletRequest httpReq,
      final HttpServletResponse httpResp) {
    return false;
  }

  /*
   * (non-Javadoc)
   *
   * @see at.gv.egovernment.moa.id.moduls.IAction#getDefaultActionName()
   */
  @Override
  public String getDefaultActionName() {
    return "IDP - PVP Metadata action";
  }

  @PostConstruct
  private void verifyInitialization() {
    if (pvpIdpCredentials == null) {
      log.error("No SAML2 credentialProvider injected!");
      throw new RuntimeException("No SAML2 credentialProvider injected!");

    }
  }

}