/*
  Mediazentrale - Personal Media Center
  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.mediaz.api;

import com.sun.net.httpserver.HttpExchange;
import de.uhilger.mediaz.App;
import de.uhilger.mediaz.Server;
import de.uhilger.mediaz.entity.Einstellung;
import de.uhilger.mediaz.entity.Entity;
import de.uhilger.mediaz.store.FileStorage;
import de.uhilger.mediaz.store.Storage;
import de.uhilger.mediaz.store.StorageFile;
import de.uhilger.mediaz.store.Track;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author ulrich
 */
public class ListFileHandler extends FileHandler {
  
  /* Der Logger fuer diesen ListFileHandler */
  private static final Logger logger = Logger.getLogger(ListFileHandler.class.getName());
  
  Map extMap = new HashMap();
  
  public ListFileHandler(String absoluteDirectoryPathAndName) {
    super(absoluteDirectoryPathAndName);
    /*
      Nachfolgend hart codiert die Ermittlung von Dateifiltern. 
      Sie werden erwartet in den Einstellungen 'audioexts' und 'videoexts'
      jeweils als Dateierweiterungen mit Komma getrennt
      z.B. "mp4,m4v"
    */
    FileStorage fs = new FileStorage(App.getInitParameter(App.getRs(App.RB_AP_CONF)));
    initMap(fs, "audioexts", StorageFile.TYP_AUDIO);
    initMap(fs, "videoexts", StorageFile.TYP_VIDEO);
  }

  private void initMap(Storage s, String key, String typ) {
    Entity e = s.read(Einstellung.class.getSimpleName(), key);
    if(e instanceof Einstellung) {
      String[] exts = ((Einstellung) e).getValue().split(",");
      for(String ext : exts) {
        extMap.put(ext, typ);
      }
    }
  }
  
  @Override
  public void handle(HttpExchange e) throws IOException {
    String path = e.getRequestURI().toString();
    logger.fine(path);
    if(path.endsWith(App.getRs(Server.RB_SLASH))) {
      String fName = getFileName(e);
      logger.fine(fName);
      File dir = new File(fileBase, fName);
      logger.fine(dir.getAbsolutePath());
      File[] files = dir.listFiles();
      ArrayList list = new ArrayList();
      if(files != null) {
        for(File file : files) {
          StorageFile sf = new StorageFile();
          String fname = file.getName();
          sf.setName(fname);
          sf.setTitelAnzName(fname);
          if(file.isDirectory()) {
            sf.setTyp(StorageFile.TYP_FOLDER);
          } else {
            int pos = fname.lastIndexOf(".");
            String ext = fname.substring(pos+1);
            logger.log(Level.FINE, "ext: {0}", ext);
            Object o = extMap.get(ext);
            if(o instanceof String) {
              sf.setTyp(o.toString());
              getTrack(file, sf);
            } else {
              sf.setTyp(StorageFile.TYP_FILE);
            }
          }
          list.add(sf);
        }
      }
      String json = jsonWithCustomType(list, "Medialiste");
      logger.fine(json);
      e.sendResponseHeaders(200, json.length());
      OutputStream os = e.getResponseBody();
      os.write(json.getBytes());
      os.close();        
    } else {
      super.handle(e);
    }
  }
  
  private void getTrack(File file, StorageFile sf) {
    if(sf.getTyp().equalsIgnoreCase(StorageFile.TYP_AUDIO)) {
      Track track = new Track(file);
      sf.setInterpret(track.getArtist());
      String trackTitel = track.getTitle();
      if(trackTitel != null && trackTitel.length() > 0) {
        sf.setTitelAnzName(trackTitel);
      }
      sf.setAlbum(track.getAlbum());
    }
  }
  
}