*/
(function(){
  window.addEventListener('load',function(){
    function focusDefaultId(){
      var tn = document.querySelector('.timelineSelected .tl-nodemark') ||
                document.querySelector('.timelineCurrent .tl-nodemark');
      return tn ? tn.id : 'm1';
    }
    function focusFirstId(id){
      return 'm1';
    }
    function focusLastId(id){
      var el = document.getElementsByClassName('tl-nodemark');
      var tn = el ? el[el.length-1] : null;
      return tn ? tn.id : id;
    }
    function focusNextId(id,dx){
      if( dx<-1 ) return focusFirstId(id);
      if( dx>+1 ) return focusLastId(id);
      var m = /^m(\d+)$/.exec(id);
      return m!==null ? 'm' + (parseInt(m[1]) + dx) : null;
    }
    function timelineGetDataBlock(i){
      var tb = document.getElementById('timeline-data-' + i);
      return tb ? JSON.parse(tb.textContent || tb.innerText) : null;
    }

      var e = document.getElementById('timeline-kbfocus');
      if( e ) e.value = v;
    }
    focusCacheInit();
    document.addEventListener('keydown',function(evt){
      if( evt.target.tagName=='INPUT' ) return;
      var
        mSHIFT = 1<<13,
        kFRST = mSHIFT | 78 /* SHIFT+N */,
        kNEXT = 78 /* N */,
        kPREV = 77 /* M */,
        kLAST = mSHIFT | 77 /* SHIFT+M */,
        kTMLN = 74 /* J */,
        kVIEW = 75 /* K */,
        kDONE = 76 /* L */,
        mod = evt.altKey<<15 | evt.ctrlKey<<14 | evt.shiftKey<<13,
        key = ( evt.which || evt.keyCode ) | mod;
      var dx = 0;
      switch( key ){
        case kFRST: dx = -2; break;
        case kNEXT: dx = -1; break;
        case kPREV: dx = +1; break;
        case kLAST: dx = +2; break;
        case kTMLN: break;
        case kVIEW: break;
        case kDONE: break;
        default: return;
      }
      if( key==kDONE ){
        focusCacheSet(null);
        focusVisualize(null,false);
        document.cookie =
          'fossil_timeline_kbnav=;expires=Thu, 01 Jan 1970 00:00:01 GMT;path=/';
        return;
      }