/* pontvs.studio - shared script: languages, masthead menu, WhatsApp window, contact posting.
   Each page may define window.PAGE_T = {it:{...}, de:{...}} BEFORE this file loads.
   English is whatever is written in the page itself; it is read once at start and kept,
   so switching back to EN restores it exactly. */
(function(){
  "use strict";
  var COMMON = {
    it:{
    },
    de:{
    }
  };
  /* strings used from script (status lines and the like) */
  var STR = {
  };
  var PAGE = window.PAGE_T || {};
  var LANGS = ['en','it','de'];
  var lang = 'en';
  var EN = {}, ENPH = {}, ENAL = {}, ENTITLE = document.title;
  var listeners = [];
  function dict(L){
    var d = {}, k;
    if(COMMON[L]) for(k in COMMON[L]) d[k] = COMMON[L][k];
    if(PAGE[L]) for(k in PAGE[L]) d[k] = PAGE[L][k];
    return d;
  }
  function snapshot(){
    var ns = document.querySelectorAll('[data-i18n]');
    var ph = document.querySelectorAll('[data-ph]');
    var al = document.querySelectorAll('[data-al]');
  }
  function apply(L){
    if(LANGS.indexOf(L) < 0) L = 'en';
    lang = L;
    var d = L === 'en' ? {} : dict(L);
    document.documentElement.lang = L;
    var ns = document.querySelectorAll('[data-i18n]');
    var ph = document.querySelectorAll('[data-ph]');
    var al = document.querySelectorAll('[data-al]');
    for(var a=0;a<al.length;a++){ var q = al[a].getAttribute('data-al'); var v = (q in d) ? d[q] : ENAL[q];
      if(al[a].tagName === 'IMG') al[a].setAttribute('alt', v); else al[a].setAttribute('aria-label', v); }
    document.title = d.docTitle || ENTITLE;
    var bs = document.querySelectorAll('.langs button');
    try{ localStorage.setItem('pvs-lang', L); }catch(e){}
    for(var l=0;l<listeners.length;l++) listeners[l](L);
  }
  function s(key){ return (STR[lang] && STR[lang][key]) || STR.en[key] || key; }
  function initialLang(){
    var m = /[?&]lang=(en|it|de)\b/.exec(location.search);
    if(m) return m[1];
    try{ var st = localStorage.getItem('pvs-lang'); if(LANGS.indexOf(st) >= 0) return st; }catch(e){}
    var nv = (navigator.language || 'en').slice(0,2).toLowerCase();
    return LANGS.indexOf(nv) >= 0 ? nv : 'en';
  }
  /* posting to /api/contact; on any failure the visitor gets a ready email instead */
  function post(payload, statusEl, mailSubject, mailBody, onOk){
    function say(m,c){ statusEl.textContent = m; statusEl.className = 'status' + (c ? ' ' + c : ''); }
    say(s('sending'));
      .catch(function(){
        say(s('errSend'), 'bad');