function NutzerApp() {
  var self = this;
  var appMenu;
  var vorlagen;
  var api;
  var userid;
  var pfad = '';
  var loc;
  var modus = 'kacheln';

  this.datei_neuer_text = function () {
    self.meldung_mit_timeout("Neuer Text", 1500);
  };
  
  /* Nutzerverwaltung */
  
  this.nutzerliste_klick = function(event) {
    var target = event.target;
    var gewaehlterNutzer = document.querySelector(".nutzer-gewaehlt");
    if(gewaehlterNutzer !== null) {
      gewaehlterNutzer.classList.remove("nutzer-gewaehlt");
    }
    target.classList.add("nutzer-gewaehlt");
  };

  /* Funktionen aus App-Vorlage */

  this.init = function () {
    self.vorlagen = new Vorlagen();
    self.appMenu = new AppMenu();
    self.appMenu.init(
            "data/menu/",
            "hauptmenue.json",
            "data/tpl/app-menu.tpl",
            ".west",
            "8em");
    document.querySelector('.hamburger').addEventListener('click', function (e) {
      self.menue_umschalten();
    });
    var dlg = document.querySelector(".dialog");
    dlg.style.flexBasis = '0em';
    self.seitenleiste_umschalten();
    self.um_get_login();
    self.um_get_user_list();
    self.loc = window.location.protocol + '//' + window.location.host;
  };

  this.login_zeigen = function() {
    self.meldung_mit_timeout("Benutzer: " + self.userid, 1500);
  };
  
  this.menue_umschalten = function () {
    var ham = document.querySelector(".hamburger");
    ham.classList.toggle("is-active"); // hamburger-icon umschalten
    self.appMenu.toggle(); // menue oeffnen/schliessen
  };

  this.info_dialog_zeigen = function () {
    self.dialog_laden_und_zeigen('data/tpl/dlg-info.tpl', '');
    self.menue_umschalten();
  };

  this.nutzer_neu_dialog_zeigen = function () {
    self.dialog_laden_und_zeigen('data/tpl/dlg-nutzer-neu.tpl', '');
    self.menue_umschalten();
  };

  this.seitenleiste_umschalten = function () {
    var ostDiv = document.querySelector('.ost');
    if (ostDiv.classList.contains('ost-open')) {
      ostDiv.classList.remove('ost-open');
      ostDiv.style.flexBasis = '0em';
    } else {
      ostDiv.classList.add('ost-open');
      ostDiv.style.flexBasis = '6em';
    }
    self.menue_umschalten();
  };

  this.fusszeile_umschalten = function () {
    var suedDiv = document.querySelector('.sued');
    if (suedDiv.classList.contains('sued-open')) {
      suedDiv.classList.remove('sued-open');
      suedDiv.style.height = '0';
    } else {
      suedDiv.classList.add('sued-open');
      suedDiv.style.height = '1.5em';
    }
    self.menue_umschalten();
  };

  this.meldung_mit_timeout = function (meldung, timeout) {
    var s = document.querySelector('.sued');
    s.textContent = meldung;
    setTimeout(function () {
      s.textContent = 'Bereit.';
      setTimeout(function () {
        var suedDiv = document.querySelector('.sued');
        if (suedDiv.classList.contains('sued-open')) {
          suedDiv.classList.remove('sued-open');
          suedDiv.style.height = '0';
        }
      }, 500);
    }, timeout);
  };

  /* Dialog-Funktionen */

  /*
   Einen Dialog aus Vorlagen erzeugen
   
   vurl - URL zur Dialogvorlage
   msgTpl - URL mit einer Vorlage eines Mitteilungstextes (optional)
   */
  this.dialog_laden_und_zeigen = function (vurl, msgTpl) {
    if (msgTpl !== '') {
      fetch(msgTpl)
              .then(data => {
                // Handle data
                self.dialog_zeigen(vurl, data);
              }).catch(error => {
        // Handle error
      });
    } else {
      self.dialog_zeigen(vurl, '');
    }
  };

  this.dialog_zeigen = function (vurl, inhalt) {
    var dlg = document.querySelector(".dialog");
    self.vorlagen.html_erzeugen(
            vurl,
            inhalt,
            function (html) {
              dlg.style.flexBasis = '14em';
              setTimeout(function () {
                dlg.innerHTML = html;
                document.querySelector('.close-btn').addEventListener('click', self.dialog_schliessen);
              }, 300);
            });
  };

  this.dialog_schliessen = function () {
    document.querySelector('.close-btn').removeEventListener('click', self.dialog_schliessen);
    var dlg = document.querySelector('.dialog');
    dlg.innerHTML = '';
    dlg.style.flexBasis = '0em';
  };

  /* API functions */
  
  this.um_get_user_list = function() {
    //var m = 'getUserNameList';
    var m = 'getUserNameList';
    var u = '../svc/' + m;
    self.um_get(u, "json", function (antwort) {
    self.vorlagen.html_erzeugen(
      'data/tpl/inhalt.tpl',
      JSON.parse(antwort),
      function (h) {
        var elem = document.getElementById('nutzer');
        elem.innerHTML = h;
        
        var absaetze = document.querySelectorAll('p.nutzer-liste-eintrag');
        var index;
        for (index = 0; index < absaetze.length; index++) {
          absaetze[index].addEventListener("click", self.nutzerliste_klick);
        }
        
      });
    });
  };

  /* -------- An- und Abmelden ------------- */

  this.um_get_login = function() {
    var m = '?c=de.uhilger.um.pub.SessionManager&m=getSessionUser';
    var u = '../pub' + m;
    self.um_get(u, "text", function (resp) {
      self.userid = resp;
      self.login_zeigen();
      //document.querySelector("#userMenu").textContent = resp;
    });
  };

  this.um_logout = function() {
    var m = '?c=de.uhilger.um.pub.SessionManager&m=expireSession';
    var u = '../pub' + m;
    self.um_get(u, "text", function (resp) {
      //$('#userMenu').text('nicht angemeldet');
      window.location.href = '../logout.html';
    });
  };

  /* -------- ajax helper functions ----------- */

  this.um_get = function (u, dtype, scallback) {    
    var xmlhttp = new XMLHttpRequest();
    var url = u;
    xmlhttp.onreadystatechange = function() {
      if (this.readyState == 4 && this.status == 200) {
        scallback(this.responseText);
      }
    };
    xmlhttp.open("GET", url, true);
    xmlhttp.send();
  };
  
/* ----- Hilfsfunktionen ----- */

  this.serialisieren = function(obj) {
    return '{"' + obj.constructor.name + '":' + JSON.stringify(obj) + '}';
  };

}


/* ----- Objekte ----- */

function User(i, p, fn, ln, em) {
  this.id = i;
  this.pw = p;
  this.firstName = fn;
  this.lastName = ln;
  this.email = em;
}