/*
  http-adoc - Asciidoctor extensions to jdk.httpserver
  Copyright (C) 2021  Ulrich Hilger

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as
  published by the Free Software Foundation, either version 3 of the
  License, or (at your option) any later version.

  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 Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License
  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
package de.uhilger.httpserver.adoc;

import com.sun.net.httpserver.Filter;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import de.uhilger.httpserver.base.handler.FileHandler;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.util.logging.Logger;

/**
 * AdocFilter prueft, ob fuer eine 
 * Asciidoctor-Quelldatei bereits eine HTML-Version vorliegt. Wenn nicht,
 * verwendet der AdocFilter den AdocActor, um eine HTML-Version zu erzeugen.
 * 
 * @author Ulrich Hilger
 * @version 1, 16.06.2021
 */
public class AdocFilter extends Filter {
  
  private static final Logger logger = Logger.getLogger(AdocFilter.class.getName());
  
  public static final String DESCRIPTION = "Asciidoctor Filter";
  
  public static final String ADOC = ".adoc";

  @Override
  public void doFilter(HttpExchange exchange, Chain chain) throws IOException {
    URI uri = exchange.getRequestURI();
    String query = uri.getQuery();
    //String[] params = query.split("?&"); // hier noch Regex ermitteln
    String requestPathStr = uri.getPath();
    //logger.fine("filter: " + requestUriStr);
    
    if(requestPathStr.toLowerCase().endsWith(ADOC)) {
      logger.fine("filter: " + requestPathStr);
      HttpHandler handler = exchange.getHttpContext().getHandler();
      if(handler instanceof FileHandler) {
        FileHandler fileHandler = (FileHandler) handler;
        String fileBase = fileHandler.getFileBase();
        AdocActor actor = new AdocActor();
        actor.processAdocFile(new File(fileBase, fileHandler.getFileName(exchange)), Boolean.FALSE.toString());
      }
    }    
    chain.doFilter(exchange);
  }

  @Override
  public String description() {
    return DESCRIPTION;
  }
  
}