/*
  Proto - Ein Rumpf-Konstrukt fuer Webapps
  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/>.
*/
function Proto() {
  var self = this;
  var appMenu;
  var cache; // mustache templates


  this.init = function() {
    self.cache = new Array();
    self.appMenu = new AppMenu();
    self.appMenu.init(
      "data/menu/",
      "hauptmenue.json",
      "data/tpl/app-menu.txt",
      ".west",
      "8em");

    document.querySelector('.hamburger').addEventListener('click', function(e) {
      self.menue_umschalten();
    });
    
    self.fusszeile_umschalten();
    self.seitenleiste_umschalten();

  };

  /* ------------------ sonstige Helfer ----------------------- */
      
  this.addEvtListener = function(selector, eventName, func) {
    document.querySelectorAll(selector).forEach(elem => { elem.addEventListener(eventName, func); });
  };
  
  this.removeClassMulti = function(selector) {
    document.querySelectorAll('.' + selector).forEach(elem => { elem.classList.remove(selector); });
  };
  
  /* --------------------- asynchroner HTTP Client ----------------- */
  
  this.http_get = function (u, cb) {
    self.http_call('GET', u, null, cb);
  };

  this.http_post = function (u, data, cb) {
    self.http_call('POST', u, data, cb);
  };

  this.http_put = function (u, data, cb) {
    self.http_call('PUT', u, data, cb);
  };
  
  this.http_delete = function (u, data, cb) {
    // console.log("delete " + u);
    self.http_call('DELETE', u, data, cb);
  };
  
  this.http_call = function (method, callurl, data, scallback) {
    var xhr = new XMLHttpRequest();
    xhr.onreadystatechange = function () {
      if (this.readyState === 4 && this.status === 200) {
        scallback(this.responseText);
      }
    };
    xhr.open(method, callurl);
    if (method === 'GET') {
      xhr.send();
    } else if (method === 'POST' || method === 'PUT' || method === 'DELETE') {
      xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
      xhr.send(data);
    }
  };
  
  /* ------------------------ aus App-Vorlage -------------------  */

  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.txt', '');
    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.menu_message = function (msg) {
    self.meldung_mit_timeout(msg, 1500);
    var suedDiv = document.querySelector('.sued');
    if (suedDiv.classList.contains('sued-open')) {
    } else {
      suedDiv.classList.add('sued-open');
      suedDiv.style.height = '1.5em';
    }
    self.menue_umschalten();
  };

  this.message_1 = function () {
    self.menu_message('Eine Mitteilung.');
  };

  this.message_2 = function () {
    self.menu_message('Was wir schon immer sagen wollten.');
  };

  this.message_3 = function (text) {
    self.menu_message(text);
  };

  this.meldung_mit_timeout = function (meldung, timeout) {
    var s = document.querySelector('.sued');
    s.classList.add('sued-open');
    s.style.height = '1.5em';
    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, cb) {
    var vorlage = self.cache[vurl];
    if(vorlage === undefined) {
      self.http_get(vurl, function(antwort) {
        self.cache[vurl] = antwort;
        self.dialog_zeigen(vurl, msgTpl, cb);
      });
    } else {
      self.dialog_zeigen(vurl, msgTpl, cb);
    }
  };

  this.dialog_zeigen = function (vurl, inhalt, cb) {
    var dlg = document.querySelector(".dialog");
    self.html_erzeugen(vurl, inhalt, function (html) {
      dlg.style.height = '7em';
      dlg.innerHTML = html;
      document.querySelector('.close-btn').addEventListener('click', self.dialog_schliessen);
      if(typeof(cb) !== 'function') {
        // ..
      } else {
        cb();
      }
    });
  };
  
  this.dialog_schliessen = function () {
    document.querySelector('.close-btn').removeEventListener('click', self.dialog_schliessen);
    var dlg = document.querySelector('.dialog');
    dlg.style.height = '0';
    dlg.innerHTML = '';
  };

  /* ---------------------   Vorlagen   ---------------------- */

  /*
   Das HTML erzeugen, das entsteht, wenn eine Vorlage mit Inhalt
   gefüllt wird
   
   Das Füllen erfolgt asynchron, d.h. der Programmlauf geht nach dem
   Aufruf weiter ohne auf das Laden und Füllen der Vorlage zu warten.
   Das fertige HTML wird der Callback-Funktion übergeben
   sobald die Vorlage geladen und gefüllt ist, unabhängig davon, wo der
   Programmlauf zu diesem Zeitpunkt mittlerweile ist.
   
   vurl - URL zur Vorlagendatei
   inhalt - die JSON-Struktur, deren Inhalt in die
   Vorlage gefüllt werden soll
   cb - Callback-Funktion, die gerufen wird, wenn die Vorlage gefüllt ist.
   Dieser Callback-Funktion wird das fertige HTML übergeben
   */
  this.html_erzeugen = function (vurl, inhalt, cb) {
    var vorlage = self.cache[vurl];
    if (vorlage === undefined) {
      self.vorlage_laden_und_fuellen(vurl, inhalt, cb);
    } else {
      self.vorlage_fuellen(vurl, inhalt, cb);
    }
  };

  this.vorlage_fuellen = function (vurl, inhalt, cb) {
    cb(Mustache.render(self.cache[vurl], inhalt));
  };

  /*
   Eine Vorlage vom Server in den lokalen Speicher laden
   vurl - der URL unter dem die Vorlage zu finden ist
   inhalt - die JSON-Struktur, deren Inhalt in die
   Vorlage gefüllt werden soll
   cb - callback: Diese Funktion wird gerufen, wenn die Vorlage mit dem
   Inhalt gefüllt ist
   */
  this.vorlage_laden_und_fuellen = function (vurl, inhalt, cb) {
    var xmlhttp = new XMLHttpRequest();
    xmlhttp.onreadystatechange = function () {
      if (this.readyState == 4 && this.status == 200) {
        self.cache[vurl] = this.responseText;
        self.vorlage_fuellen(vurl, inhalt, cb);
      }
    };
    xmlhttp.open("GET", vurl, true);
    xmlhttp.send();
  };



}