/*
  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;

import com.sun.net.httpserver.HttpServer;
import de.uhilger.mediaz.api.FileHandler;
import de.uhilger.mediaz.api.GeraetSteuerung;
import de.uhilger.mediaz.api.ListFileHandler;
import de.uhilger.mediaz.api.ListHandler;
import de.uhilger.mediaz.api.MediaSteuerung;
import de.uhilger.mediaz.api.StopServerHandler;
import de.uhilger.mediaz.api.StorageHandler;
import de.uhilger.mediaz.store.FileStorage;
import de.uhilger.mediaz.entity.Ablageort;
import java.io.File;
import java.io.IOException;
import java.util.logging.Logger;
import java.net.InetSocketAddress;
import java.util.concurrent.Executors;
import java.util.logging.Level;
import de.uhilger.mediaz.entity.Entity;
import java.util.Iterator;
import java.util.List;

/**
 * Die Klasse Server stellt Methoden zur Ausf&uuml;hrung eines HTTP-Servers
 * bereit
 *
 * @author Ulrich Hilger
 * @version 0.1, 25.03.2021
 */
public class Server {

  private static final Logger logger = Logger.getLogger(Server.class.getName());

  public static final String RB_SERVER_START_MSG = "msgServerStart";
  public static final String RB_WEBROOT = "webroot";
  public static final String RB_STORE = "store";
  public static final String RB_STRG = "strg";
  public static final String RB_GSTRG = "gstrg";
  public static final String RB_ALIST= "alist";
  //public static final String RB_UI_ROOT = "uiroot";
  public static final String RB_STOP_SERVER = "stopServer";
  //public static final String RB_ABLAGE_TEST = "testAblage";
  //public static final String RB_STORE_TEST = "testStore";
  public static final String SLASH = "/";

  private int port;

  private String ctx;
  
  private HttpServer server;

  /**
   * Ein neues Objekt der Kalsse Server erzeugen
   *
   * @param port der Port, &uuml;ber den dieser Server erreichbar sein soll
   */
  public Server(int port) {
    this.port = port;
  }

  /**
   * Den Port angeben, unter dem der Server erreichbar sein soll
   *
   * @param port der Port, unter dem der Server erreichbar sein soll
   */
  public void setPort(int port) {
    this.port = port;
  }

  /**
   * Den Namen des Kontexts angeben, &uuml;ber den dieser Server erreichbar sein
   * soll
   *
   * @param ctxName Name des Kontexts, unter dem der Server aufrufbar sein soll
   */
  public void setContextName(String ctxName) {
    if (!ctxName.startsWith(SLASH)) {
      this.ctx = SLASH + ctxName;
    } else {
      this.ctx = ctxName;
    }
  }

  /**
   * Die Endpunkte einrichten, unter denen die Dienste dieses
   * Servers erreichbar sein sollen und den Server starten
   *
   * @throws IOException wenn etwas schief geht, finden sich Angaben in diesem
   * Objekt
   * @throws java.lang.ClassNotFoundException
   */
  public void start() throws IOException, ClassNotFoundException {
    logger.log(Level.INFO, App.getRs(RB_SERVER_START_MSG), Integer.toString(port));

    String wwwData = App.getInitParameter(App.getRs(App.RB_AP_WWW_DATA));
    File wwwDir = new File(wwwData);

    server = HttpServer.create(new InetSocketAddress(port), 0);
    server.createContext(ctx + App.getRs(RB_WEBROOT), new FileHandler(wwwDir.getAbsolutePath()));
    ablageorteEinklinken(server);
    server.createContext(ctx + App.getRs(RB_STORE), new StorageHandler());
    server.createContext(ctx + App.getRs(RB_STRG), new MediaSteuerung());
    server.createContext(ctx + App.getRs(RB_GSTRG), new GeraetSteuerung());
    server.createContext(ctx + App.getRs(RB_ALIST), new ListHandler());
    server.createContext(ctx + App.getRs(RB_STOP_SERVER), new StopServerHandler());
    server.setExecutor(Executors.newFixedThreadPool(20));
    server.start();
  }
  
  public void ablageortEntfernen(String url) {
    server.removeContext(ctx + url);
  }

  public void ablageortHinzufuegen(Ablageort ort) {
    server.createContext(ctx + ort.getUrl(),  
          new ListFileHandler(new File(ort.getOrt()).getAbsolutePath()));
  }
  
  private void ablageorteEinklinken(HttpServer server) 
              throws ClassNotFoundException, IOException {
    String typ = Ablageort.class.getSimpleName();
    FileStorage store = new FileStorage(App.getInitParameter(App.getRs(App.RB_AP_CONF)));
    List<String> orte = store.list(typ);
    Iterator<String> i = orte.iterator();
    while(i.hasNext()) {
      String ortName = i.next();
      Entity e = store.read(typ, ortName);
      if(e instanceof Ablageort) {
        Ablageort ablageort = (Ablageort) e;
        logger.log(Level.FINE, "{0}{1}", new Object[]{ctx, ablageort.getUrl()});
        logger.fine(ablageort.getOrt());
        server.createContext(ctx + ablageort.getUrl(),  
          new ListFileHandler(new File(ablageort.getOrt()).getAbsolutePath()));
      }
    }
  }
}