/*
  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.google.gson.Gson;
import com.sun.net.httpserver.HttpExchange;
import de.uhilger.mediaz.App;
import static de.uhilger.mediaz.App.RB_EP_LISTE;
import de.uhilger.mediaz.Server;
import de.uhilger.mediaz.store.FileStorage;
import de.uhilger.mediaz.entity.Entity;
import de.uhilger.mediaz.entity.Geraet;
import static de.uhilger.mediaz.store.FileStorage.ST_ABLAGEORT;
import static de.uhilger.mediaz.store.FileStorage.ST_GERAET;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.ProxySelector;
import java.net.URI;
import java.net.URL;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

import java.net.http.HttpClient;
import java.net.http.HttpClient.Version;
import java.net.http.HttpClient.Redirect;
import java.net.http.HttpClient.Builder;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandlers;
import java.time.Duration;
import java.util.ArrayList;


/**
 * HttpHandler fuer die Verwaltung von Entitaeten der Mediazentrale
 * 
 * @author Ulrich Hilger
 * @version 1, 5.4.2021
 */
public class StorageHandler extends AbstractHandler {
  
  private static final Logger logger = Logger.getLogger(StorageHandler.class.getName());

  @Override
  protected String put(HttpExchange e) throws IOException {
    String path = e.getRequestURI().toString();
    String[] elems = path.split(Server.SLASH);
    String type = elems[elems.length - 2];
    String elemName = elems[elems.length - 1]; // alter Name, wenn Aenderung
    if(!elemName.equalsIgnoreCase(App.getRs(RB_EP_LISTE))) {
      FileStorage fs = new FileStorage(App.getInitParameter(App.getRs(App.RB_AP_CONF)));
      Gson gson = new Gson();
      logger.log(Level.FINE, "type: {0}, token: {1}", new Object[]{type, fs.typeFromName(type).getType().getTypeName()});
      Object o = gson.fromJson(bodyLesen(e), fs.typeFromName(type).getType());
      if(o instanceof Entity) {
        Entity entity = (Entity) o;
        if(fs.exists(type, elemName)) {
          fs.delete(type, elemName);
          fs.write(entity, true);
        } else {
          fs.write(entity, false);
        }
        return type + Server.SLASH + entity.getName();
      } else {
        return "Ungueltiges Objekt im Body.";
      }
    } else {
      return "Ungueltiger Elementname: " + App.getRs(RB_EP_LISTE);
    }
  }
  
  private boolean loeschen(HttpExchange e) {
    String path = e.getRequestURI().toString();
    String[] elems = path.split(Server.SLASH);
    String type = elems[elems.length - 2];
    String elemName = elems[elems.length - 1];
    FileStorage fs = new FileStorage(App.getInitParameter(App.getRs(App.RB_AP_CONF)));
    return fs.delete(type, elemName);
  }
  
  private String lesen(HttpExchange e) throws IOException, InterruptedException {
    String path = e.getRequestURI().toString();
    String[] elems = path.split(Server.SLASH);
    FileStorage fs = new FileStorage(App.getInitParameter(App.getRs(App.RB_AP_CONF)));
    if(path.endsWith(Server.SLASH)) {
      List list = null;
      if(elems[elems.length - 1].equalsIgnoreCase(App.getRs(RB_EP_LISTE))) {
        String type = elems[elems.length - 2];
        logger.fine(type);
        if(type.equalsIgnoreCase(ST_GERAET)) {
          list = fs.listObjects(type);
          List<Geraet> newList = new ArrayList();
          Iterator<Entity> i = list.iterator();
          while(i.hasNext()) {
            Entity entity = i.next();
            if(entity instanceof Geraet) {
              Geraet g = (Geraet) entity;
              String statusurl = g.getStatusUrl();
              logger.info(statusurl);
              
              HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create(statusurl))
                .build();
              HttpClient client = HttpClient.newBuilder()
                    .version(Version.HTTP_1_1)
                    .followRedirects(Redirect.NORMAL)
                    .connectTimeout(Duration.ofSeconds(20))
                    //.proxy(ProxySelector.of(new InetSocketAddress("proxy.example.com", 80)))
                    //.authenticator(Authenticator.getDefault())
                    .build();
               HttpResponse<String> response = client.send(request, BodyHandlers.ofString());
               logger.finer(Integer.toString(response.statusCode()));
               logger.finer(response.body());                
               // {"ison":false,"has_timer":false,"overpower":false}
               String[] parts = response.body().split(",")[0].split(":");
               logger.finer("ison: " + parts[1]);
               g.setStatus(parts[1]);
               newList.add(g);
            }
          }
          list = newList;
        } else {        
          list = fs.list(type);
        }
        if(type.equalsIgnoreCase(ST_ABLAGEORT)) {
          list.add("Livestreams");
        }
      } else {
        String type = elems[elems.length - 1];
        logger.fine(type);
        list = fs.listObjects(type);
      }
      return jsonWithEnclosingType(list);
    } else {
      String type = elems[elems.length - 2];
      String elemName = elems[elems.length - 1];
      return fs.readJson(type, elemName);
    }
  }
  
  @Override
  public String get(HttpExchange e) {
    try {
      return lesen(e);
    } catch (IOException | InterruptedException ex) {
      Logger.getLogger(StorageHandler.class.getName()).log(Level.SEVERE, null, ex);
      return ex.getLocalizedMessage();
    }
  }

  @Override
  public String post(HttpExchange e) {
    return "nicht unterstuetzt";
  }

  @Override
  public boolean delete(HttpExchange e) {
    return loeschen(e);
  }
}