(function(){
  const form = document.querySelector('#chat-form');


  const F = window.fossil, D = F.dom;
  const Chat = (function(){
    const cs = {
      me: F.user.name,
      mxMsg: F.config.chatInitSize ? -F.config.chatInitSize : -50,
      pageIsActive: !document.hidden,
      onPageActive: function(){console.debug("Page active.")}, //override below
      onPageInactive: function(){console.debug("Page inactive.")} //override below
    };
    document.addEventListener('visibilitychange', function(ev){
      cs.pageIsActive = !document.hidden;
      if(cs.pageIsActive) cs.onPageActive();
      else cs.onPageInactive();
    }, true);
    return cs;
  })();
  /* State for paste and drag/drop */
  const BlobXferState = {
    dropDetails: document.querySelector('#chat-drop-details'),
    blob: undefined
  };
  /** Updates the paste/drop zone with details of the pasted/dropped
      data. The argument must be a Blob or Blob-like object (File) or

    if(f.injectPoint.nextSibling){
      f.injectPoint.parentNode.insertBefore(e, f.injectPoint.nextSibling);
    }else{
      f.injectPoint.parentNode.appendChild(e);
    }
  };
  /* Returns a new TEXT node with the given text content. */

  /** Returns the local time string of Date object d, defaulting
      to the current time. */
  const localTimeString = function ff(d){
    if(!ff.pad){
      ff.pad = (x)=>(''+x).length>1 ? x : '0'+x;
    }
    d || (d = new Date());

    }
    f.popup.show(x, y);
  };
  /** Callback for poll() to inject new content into the page. */
  function newcontent(jx){
    var i;
    for(i=0; i<jx.msgs.length; ++i){
      const m = jx.msgs[i];

      if( m.msgid>Chat.mxMsg ) Chat.mxMsg = m.msgid;
      const eWho = D.create('legend'),
            row = D.addClass(D.fieldset(eWho), 'message-row');
      injectMessage(row);

      eWho.dataset.timestamp = m.mtime;
      eWho.addEventListener('click', handleLegendClicked, false);
      if( m.xfrom==Chat.me && window.outerWidth<1000 ){
        eWho.setAttribute('align', 'right');
        row.style.justifyContent = "flex-end";
      }else{
        eWho.setAttribute('align', 'left');
      }
      eWho.style.backgroundColor = m.uclr;

      eWho.classList.add('message-user');
      let whoName = m.xfrom;
      var d = new Date(m.mtime + "Z");
      if( d.getMinutes().toString()!="NaN" ){
        /* Show local time when we can compute it */
        eWho.append(D.text(whoName+' @ '+
          d.getHours()+":"+(d.getMinutes()+100).toString().slice(1,3)
        ))
      }else{
        /* Show UTC on systems where Date() does not work */
        eWho.append(D.text(whoName+' @ '+m.mtime.slice(11,16)))
      }

      let eContent = D.addClass(D.div(),'message-content','chat-message');
      eContent.style.backgroundColor = m.uclr;
      row.appendChild(eContent);
      if( m.fsize>0 ){
        if( m.fmime && m.fmime.startsWith("image/") ){

          eContent.appendChild(D.img("chat-download/" + m.msgid));

        }else{
          eContent.appendChild(D.a(

            window.fossil.rootPath+
              'chat-download/' + m.msgid+'/'+encodeURIComponent(m.fname),
            // ^^^ add m.fname to URL to cause downloaded file to have that name.
            "(" + m.fname + " " + m.fsize + " bytes)"
          ));

        }
        const br = D.br();
        br.style.clear = "both";
        eContent.appendChild(br);
      }
      if(m.xmsg){
        try{D.moveChildrenTo(eContent, D.parseHtml(m.xmsg))}
        catch(e){console.error(e)}
      }
      eContent.classList.add('chat-message');
    }
  }
  async function poll(){
    if(poll.running) return;
    poll.running = true;
    fetch("chat-poll?name=" + Chat.mxMsg)
    .then(x=>x.json())
    .then(y=>newcontent(y))
    .catch(e=>console.error(e))
    .finally(()=>poll.running=false)
  }
  poll();
  setInterval(poll, 1000);
})();