/*
    * Licensed under the GPL License. You may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *   https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
    *
    * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
    * WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
    * PURPOSE.
   */
  package psiprobe.controllers.apps;
  
  import jakarta.servlet.ServletContext;
  import jakarta.servlet.http.HttpServletRequest;
  import jakarta.servlet.http.HttpServletResponse;
  
  import java.io.File;
  import java.nio.file.Path;
  
  import org.apache.catalina.Context;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.web.servlet.ModelAndView;
  
  import psiprobe.Utils;
  import psiprobe.controllers.AbstractContextHandlerController;
  
  /**
   * Downloads a deployment descriptor (web.xml) or a context descriptor (context.xml) of a web
   * application.
   */
  public class BaseDownloadXmlConfController extends AbstractContextHandlerController {
  
    /** The Constant logger. */
    private static final Logger logger = LoggerFactory.getLogger(BaseDownloadXmlConfController.class);
  
    /** The Constant TARGET_WEB_XML. */
    private static final String TARGET_WEB_XML = "web.xml";
  
    /** The Constant TARGET_CONTEXT_XML. */
    private static final String TARGET_CONTEXT_XML = "context.xml";
  
    /** Type of a configuration file to be downloaded. */
    private String downloadTarget;
  
    /**
     * Gets the download target.
     *
     * @return the download target
     */
    public String getDownloadTarget() {
      return downloadTarget;
    }
  
    /**
     * Sets the download target.
     *
     * @param downloadTarget the new download target
     */
    public void setDownloadTarget(String downloadTarget) {
      this.downloadTarget = downloadTarget;
    }
  
    @Override
    protected ModelAndView handleContext(String contextName, Context context,
        HttpServletRequest request, HttpServletResponse response) throws Exception {
  
      if (downloadTarget == null) {
        throw new RuntimeException("Download target is not set for " + getClass().getName());
      }
  
      String xmlPath;
  
      if (TARGET_WEB_XML.equals(downloadTarget)) {
        ServletContext sctx = context.getServletContext();
        xmlPath = sctx.getRealPath("/WEB-INF/web.xml");
      } else if (TARGET_CONTEXT_XML.equals(downloadTarget)) {
        xmlPath = this.getContainerWrapper().getTomcatContainer().getConfigFile(context).getPath();
      } else {
        throw new RuntimeException("Unknown download target " + getDownloadTarget());
      }
  
      if (xmlPath != null) {
        File xmlFile = Path.of(xmlPath).toFile();
        if (xmlFile.exists()) {
          Utils.sendFile(request, response, xmlFile);
        } else {
          logger.debug("File {} of {} application does not exists.", xmlPath, contextName);
        }
      } else {
        logger.debug("Cannot determine path to {} file of {} application.", getDownloadTarget(),
            contextName);
      }
      return null;
    }
  
  }