// presenter js
var slaveWindow = null;
var nextWindow  = null;
var notesWindow = null;

var paceData = [];

section = 'notes'; // which section the presenter has chosen to view

$(document).ready(function(){
  // set up the presenter modes
  mode = { track: true, follow: true, update: true, slave: false, notes: false, annotations: false, layout: 'default'};

  // the presenter window doesn't need the reload on resize bit
  $(window).unbind('resize');

  $("#startTimer").click(    function() { startTimer()    });
  $("#pauseTimer").click(    function() { toggleTimer()   });
  $("#stopTimer").click(     function() { stopTimer()     });
  $("#close-sidebar").click( function() { toggleSidebar() });
  $("#edit").click(          function() { editSlide()     });
// browser security causes a click event to react differently than an actual user click. Even though they're the same damn thing.
//  $("#report").click(        function() { reportIssue()   });
  $("#slaveWindow").click(   function() { toggleSlave()   });
  $("#printSlides").click(   function() { printDialog()   });
  $("#settings").click(      function() { $("#settings-modal").dialog("open"); });
  $("#slideSource a").click( function() { openEditor() });
  $("#notesToggle").click(   function() { toggleNotes() });
  $("#clearCookies").click(  function() {
    clearCookies();
    location.reload(false);
  });
  $("#nextWinCancel").click( function() { chooseLayout('default') });
  $("#openNextWindow").click(function() { openNext() });

  $("#notes-wrapper .fa-minus").click( function() {
    notesFontSize('decrease');
  });
  $("#notes-wrapper .fa-dot-circle-o").click( function() {
    notesFontSize('reset');
  });
  $("#notes-wrapper .fa-plus").click( function() {
    notesFontSize('increase');
  });

  $('#statslink').click(function(e) { presenterPopupToggle('/stats', e); });
  $('#downloadslink').click(function(e) { presenterPopupToggle('/download', e); });

  $('#layoutSelector').change(function(e) { chooseLayout(e.target.value); });
  chooseLayout(null);

  // the language selector is configured in showoff.js

  // must be defined using [] syntax for a variable button name on IE.
  var closeLabel      = I18n.t('presenter.settings.close');
  var buttons         = {};
  buttons[closeLabel] = function() { $(this).dialog( "close" ); };

  $("#settings-modal, #print-modal").dialog({
    autoOpen: false,
    dialogClass: "no-close",
    draggable: false,
    height: "auto",
    modal: true,
    resizable: false,
    width: 400,
    buttons: buttons
  });

  $("#annotationsToggle").checkboxradio({
    icon: false
  });

  // Bind events for mobile viewing
  if( mobile() ) {
    $('#preso').unbind('tap').unbind('swipeleft').unbind('swiperight');

    $('#preso').addSwipeEvents().
      bind('tap', presNextStep).        // next
      bind('swipeleft', presNextStep).  // next
      bind('swiperight', presPrevStep); // prev

    $('#topbar #update').click( function(e) {
      e.preventDefault();
      $.get("/getpage", function(data) {
        gotoSlide(data);
      });
    });
  }

  // set up notes resizing
  $( "#notes" ).resizable({
    minHeight: 0,
    handles: {"n": $(".notes-grippy")}
  });
  $("#notes").resize(function(){
    document.cookie = "notes="+$('#notes').height();
  });

  // restore the UI settings
  var ui = document.cookieHash['ui'];
  $('#notes').height(document.cookieHash['notes']);
  if(document.cookieHash['sidebar'] == false) {
    toggleSidebar();
  }

  // Hide with js so jquery knows what display property to assign when showing
  toggleAnnotations();

  $('#annotationToolbar i.tool').click(function(e) {
    var action = $(this).attr('data-action');

    switch (action) {
      case 'erase':
        annotations.erase();
        break;

      default:
        $('#annotationToolbar i.tool').removeClass('active');
        $(this).addClass('active');
        annotations.tool = action;
        if (slaveWindow) slaveWindow.annotations.tool = action;
        sendAnnotationConfig('tool', action);
    }

  });

  $('#annotationToolbar i.lines').click(function(e) {
    $('#annotationToolbar i.lines').removeClass('active');
    $(this).addClass('active');
    var color = $(this).css('color');

    annotations.lineColor = color;
    if (slaveWindow) slaveWindow.annotations.lineColor = color;
    sendAnnotationConfig('lineColor', color);
  });

  $('#annotationToolbar i.shapes').click(function(e) {
    $('#annotationToolbar i.shapes').removeClass('active');
    $(this).addClass('active');
    var color = $(this).css('color');

    annotations.fillColor = color;
    if (slaveWindow) slaveWindow.annotations.fillColor = color;
    sendAnnotationConfig('fillColor', color);
  });

  $('#statusbar .controls input').checkboxradio({icon: false });
  $('#remoteToggle').change( toggleFollower );
  $('#followerToggle').change( toggleUpdater );
  $('#annotationsToggle').change( toggleAnnotations );

  initializeSettings();
  setInterval(function() { updatePace() }, 1000);

  setInterval(function() {
    $.getJSON("/stats_data", function( json ) {
      var percent = json['stray_p'];
      if(percent > 25) {
        $('#topbar #statslink').addClass('warning');
        $('#topbar #statslink').attr('title', percent + '%' +  I18n.t('stats.stray'));
      }
      else {
        $('#stray').hide(); // in case the popup is open
        $('#topbar #statslink').removeClass('warning');
        $('#topbar #statslink').attr('title', "");
      }

      if( $('#presenterPopup #stats').is(':visible') ) {
        setupStats(json);
      }
    });

  }, 30000);

  // Tell the showoff server that we're a presenter
  register();

  annotations.callbacks = {
    erase: function()    {
      if (slaveWindow) slaveWindow.annotations.erase();
      sendAnnotation('erase');
    },
    draw:  function(x, y) {
      if (slaveWindow) slaveWindow.annotations.draw(x,y);
      sendAnnotation('draw', x, y);
    },
    click: function(x,y) {
      if (slaveWindow) slaveWindow.annotations.click(x,y);
      sendAnnotation('click', x, y);
    }
  };

  /* zoom slide to match preview size, then set up resize handler. */
  zoom(true);
  $(window).resize(function() { zoom(true); });

});

function presenterPopupToggle(page, event) {
  event.preventDefault();
  // remove class from both so we don't lose an active state if user clicks the wrong item
  $('#statslink').removeClass('enabled');
  $('#downloadslink').removeClass('enabled');

  var popup = $('#presenterPopup');
  if (popup.length > 0) {
    popup.slideUp(200, function () {
      popup.remove();
    });
  } else {
    $(event.target).addClass('enabled');
    popup = $('<div>');
    popup.attr('id', 'presenterPopup');
    $.get(page, function(data) {
      var link = $('<a>'),
          content = $('<div>');

      link.attr({
        href: page,
        target: '_new'
      });
      link.text(I18n.t('presenter.topbar.newpage'));

      content.attr('id', page.substring(1, page.length));
      content.append(link);
      /* use .siblings() because of how jquery formats $(data) */
      content.append($(data).siblings('#wrapper').html());
      popup.append(content);

      $('body').append(popup);
      popup.slideDown(200); // #presenterPopup is display: none by default
    });
  }
}

function reportIssue() {
  var slide = $("span#slideFile").text();
  var link  = issueUrl + encodeURIComponent('Issue with slide: ' + slide);
  window.open(link);
}

// open browser to remote edit URL
function editSlide() {
  var slide = $("span#slideFile").text().replace(/:\d+$/, '');
  var link  = editUrl + slide + ".md";
  window.open(link);
}

// call the edit endpoint to open up a local file editor
function openEditor() {
  var slide = $("span#slideFile").text().replace(/:\d+$/, '');
  var link  = '/edit/' + slide + ".md";
  $.get(link);
}

function windowIsClosed(window)
{
  return(window == null || typeof(window) == 'undefined' || window.closed);
}

function windowIsOpen(window) {
  return (window && typeof(window) != 'undefined' && !window.closed)
}

function toggleSlave() {
  mode.slave = !mode.slave;
  if (mode.slave) {
    openSlave();
  } else {
    closeSlave();
  }
}

// Open, or maintain connection & reopen slave window.
function openSlave()
{
  try {
    if(windowIsClosed(slaveWindow)){
        slaveWindow = window.open('/' + window.location.hash, 'toolbar');
    }
    else if(slaveWindow.location.hash != window.location.hash) {
      // maybe we need to reset content?
      slaveWindow.location.href = '/' + window.location.hash;
    }

    // give the window time to load before poking at it
    window.setTimeout(function() {
      // maintain the pointer back to the parent.
      slaveWindow.presenterView = window;
      slaveWindow.mode = { track: false, slave: true, follow: false };

      // Add a class to differentiate from the audience view
      slaveWindow.document.getElementById("preso").className = 'display';

      // remove some display view chrome
      $('.slide.activity', slaveWindow.document).removeClass('activity').children('.activityToggle').remove();
      $('#synchronize', slaveWindow.document).remove();

      // call back and update the parent presenter if the window is closed
      slaveWindow.onunload = function(e) {
        slaveWindow.opener.closeSlave(true);
      };
    }, 500);

    $('#slaveWindow').addClass('enabled');
  }
  catch(e) {
    console.log('Failed to open or connect display window. Popup blocker?');
  }
}

function closeSlave(calledByChild) {
  try {
    mode.slave = false;
    $('#slaveWindow').removeClass('enabled');

    if(calledByChild) {
      // if this is called by the display view, we don't want to try to close it again.
      // browsers are the worst. If the user hit *refresh*, then this should reconnect the display view
      window.setTimeout(function() {
        if(! windowIsClosed(slaveWindow)) {
          openSlave();
        }
      }, 500);
    } else {
      // called normally and close the display view
      slaveWindow && slaveWindow.close();
    }
  }
  catch (e) {
    console.log('Display window failed to close properly.');
  }

}

function nextSlideNum(url) {
  // Some fudging because the first slide is slide[0] but numbered 1 in the URL
  var snum;
  if (typeof(url) == 'undefined') { snum = currentSlideFromParams()+1; }
  else { snum = currentSlideFromParams()+2; }
  return snum;
}

// allows subsystems to pin the sidebar open. The sidebar will only hide when
// all pins have been removed.
function pinSidebar(pin) {
  $('#topbar #close-sidebar').addClass('disabled');
  $('#topbar #close-sidebar').removeClass('fa-rotate-90');
  $('#sidebar').show();
  zoom(true);

  mode.pinnedSidebar = mode.pinnedSidebar || []
  if (mode.pinnedSidebar.indexOf(pin) == -1) {
    mode.pinnedSidebar.push(pin);
  }
}

function unpinSidebar(pin) {
  if (Array.isArray(mode.pinnedSidebar)) {
    mode.pinnedSidebar = mode.pinnedSidebar.filter(function(item) {
      return item !== pin;
    });

    if(mode.pinnedSidebar.length == 0) {
      $('#topbar #close-sidebar').removeClass('disabled');
      delete mode.pinnedSidebar;
    }
  }
}

function toggleSidebar() {
  if (!mode.pinnedSidebar) {
    $('#topbar #close-sidebar').toggleClass('fa-rotate-90');
    $('#sidebar').toggle();
    zoom(true);

    document.cookie = "sidebar="+$('#sidebar').is(':visible');
  }
}

function toggleNotes() {
  mode.notes = !mode.notes;

  if (mode.notes) {
    try {
      if(windowIsClosed(notesWindow)){
        notesWindow = blankStyledWindow(I18n.t('presenter.notes.label'), 'width=350,height=450', 'notes', true);
        window.setTimeout(function() {
          $(notesWindow.document.documentElement).addClass('floatingNotes');

          // call back and update the parent presenter if the window is closed
          notesWindow.onunload = function(e) {
            notesWindow.opener.toggleNotes();
          };

          postSlide();
        }, 500);

      }
      $('#notes').addClass('hidden');
    }
    catch(e) {
      console.log('Failed to open notes window. Popup blocker?');
    }
  }
  else {
    try {
      notesWindow && notesWindow.close();
      $('#notes').removeClass('hidden');
    }
    catch (e) {
      console.log('Notes window failed to close properly.');
    }
  }

  zoom(true);
}

function notesFontSize(action) {
  var current = parseInt($('#notes').css('font-size'));
  switch (action) {
    case 'increase':
      $('#notes').css('font-size', current * 1.1);
      break;

    case 'decrease':
      $('#notes').css('font-size', current * 0.9);
      break;

    case 'reset':
      $('#notes').css('font-size', '');
      break;
  }
}

function blankStyledWindow(title, dimensions, classes, resizable) {
  // yes, the explicit address is needed. Because Chrome.
  var opts = "status=0,toolbar=0,location=0,menubar=0,"+dimensions;
  if(resizable) {
    opts += ",resizable=1,scrollbars=1";
  }
  newWindow = window.open('about:blank','', opts);

  // allow time for the window to load for Firefox and IE
  window.setTimeout(function() {
    newWindow.document.title = title;

    // IE is terrible and will explode if you try to add a DOM element to another
    // document. Instead, serialize everything into STRINGS and let jquery rebuild
    // them into elements again in the context of the other document.
    // Because IE.

    $(newWindow.document.head).append('<base href="' + window.location.origin + '"/>');
    $('link[rel="stylesheet"]').each(function() {
      var href  = $(this).attr('href');
      var style = '<link rel="stylesheet" type="text/css" href="' + href + '">'
      $(newWindow.document.head).append(style);
    });

    $(newWindow.document.body).addClass('floating');
    if(classes) {
      $(newWindow.document.body).addClass(classes);
    }

  }, 500);

  return newWindow;
}

function printDialog() {
  var list = $('#print-modal #print-sections');

  if(! list.hasClass('processed')) {
    sections = getAllSections()
    sections.unshift('') // add the "none" option
    sections.forEach(function(section) {
      var link = $('<a>');
      var item = $('<li>');
      link.attr('href', '#');
      link.click(function(){
        printSlides(section);
      });

      switch(section) {
        case '':
          link.text(I18n.t('presenter.print.none'));
          break;
        case 'notes':
          link.text(I18n.t('presenter.print.notes'));
          break;
        case 'handouts':
          link.text(I18n.t('presenter.print.handouts'));
          break;
        default:
          link.text(section);
      }

      item.append(link);
      list.append(item);
    });
    list.addClass('processed');
  }

  $("#print-modal").dialog("open");
}

function printSlides(section)
{
  try {
    var printWindow = window.open('/print/'+section);
    printWindow.window.print();
  }
  catch(e) {
    console.log('Failed to open print window. Popup blocker?');
  }
  $("#print-modal").dialog("close");
}

function postQuestion(question, questionID) {
  var questionItem = $('<li/>').text(question).attr('id', questionID);

  questionItem.click( function(e) {
      markCompleted($(this).attr('id'));
      removeQuestion(questionID);
    });

  $("#unanswered").append(questionItem);
  updateQuestionIndicator();

  // don't allow the sidebar to hid when questions exist
  pinSidebar('question');
}

function removeQuestion(questionID) {
  var question = $("li#"+questionID);
  question.toggleClass('answered')
          .remove();
  $('#answered').append($(question));
  updateQuestionIndicator();

  if($('#unanswered li').length == 0) {
    unpinSidebar('question');
  }
}

function updateQuestionIndicator() {
  try {
    slaveWindow.updateQuestionIndicator( $('#unanswered li').length )
  }
  catch (e) {}
}

function paceFeedback(pace) {
  var now = new Date();
  switch(pace) {
    case 'faster': paceData.push({time: now, pace: -1}); break; // too fast
    case 'slower': paceData.push({time: now, pace:  1}); break; // too slow
  }

  updatePace();
}

function updatePace() {
  // pace notices expire in a few minutes
  var cutoff     = 3 * 60 * 1000;
  var expiration = new Date().getTime() - cutoff;

  var scale = 10; // this should max out around 5 clicks in either direction
  var sum   = 50; // start in the middle

  // Loops through and calculates a decaying average
  for (var index = 0; index < paceData.length; index++) {
    var notice = paceData[index];

    if(notice.time < expiration) {
      paceData.splice( index, 1 );
    }
    else {
      var ratio = (notice.time - expiration) / cutoff;
      sum  += (notice.pace * scale * ratio);
    }
  }

  var position = Math.max(Math.min(sum, 90), 10); // between 10 and 90
  $("#paceMarker").css({ left: position+"%" });

  if (position > 50) {
    $("#feedbackPace .obscure.left").css({ width: "50%" });
    $("#feedbackPace .obscure.right").css({ width: (100-position)+"%" });
  }
  else {
    $("#feedbackPace .obscure.right").css({ width: "50%" });
    $("#feedbackPace .obscure.left").css({ width: position+"%" });
  }

  if(position > 75) {
    $("#paceFast").show();
  } else {
    $("#paceFast").hide();
  }
  if(position < 25) {
    $("#paceSlow").show();
  } else {
    $("#paceSlow").hide();
  }
}

function updateActivityCompletion(count) {
  currentSlide.children('.count').text(count);
}

// extend this function to add presenter bits
var origGotoSlide = gotoSlide;
gotoSlide = function (slideNum)
{
    origGotoSlide.call(this, slideNum)
    try { slaveWindow.gotoSlide(slideNum, false) } catch (e) {}
    if ( !mobile() ) {
      $("#navigation li li").get(slidenum).scrollIntoView();
    }
    postSlide();
}

// override with an alternate implementation.
// We need to do this before opening the websocket because the socket only
// inherits cookies present at initialization time.
reconnectControlChannel = function() {
  $.ajax({
    url: "presenter",
    success: function() {
      // In jQuery 1.4.2, this branch seems to be taken unconditionally. It doesn't
      // matter though, as the disconnected() callback routes back here anyway.
      console.log("Refreshing presenter cookie");
      connectControlChannel();
    },
    error: function() {
      console.log("Showoff server unavailable");
      setTimeout( function() {
        reconnectControlChannel();
      }, 5000);
    },
  });
}

function markCompleted(questionID) {
  ws.send(JSON.stringify({ message: 'complete', questionID: questionID}));
}

function update() {
  if(mode.update) {
    var slideName = $("#slideFile").text();
    ws.send(JSON.stringify({ message: 'update', slide: slidenum, name: slideName, increment: incrCurr}));
  }
}

// Tell the showoff server that we're a presenter, giving the socket time to initialize
function register() {
  setTimeout( function() {
    try {
      ws.send(JSON.stringify({ message: 'register' }));
    }
    catch(e) {
      console.log("Registration failed. Sleeping");
      // try again, until the socket finally lets us register
      register();
    }
  }, 5000);
}

function presPrevStep()
{
  prevStep();
  try { slaveWindow.prevStep(false) } catch (e) {};
  try { nextWindow.gotoSlide(nextSlideNum()) } catch (e) {};
  postSlide();

  update();
}

function presNextStep()
{
  nextStep();
	try { slaveWindow.nextStep(false) } catch (e) {};
  try { nextWindow.gotoSlide(nextSlideNum()) } catch (e) {};
	postSlide();

	update();
}

function presPrevSec()
{
  prevSec();
  try { slaveWindow.prevSec(false) } catch (e) {};
  try { nextWindow.gotoSlide(nextSlideNum()) } catch (e) {};
  postSlide();

  update();
}

function presNextSec()
{
  nextSec();
  try { slaveWindow.nextSec(false) } catch (e) {};
  try { nextWindow.gotoSlide(nextSlideNum()) } catch (e) {};
  postSlide();

  update();
}

function postSlide() {
	if(currentSlide) {
    // clear out any existing rendered forms
    try {
      clearInterval(renderFormInterval)
    }
    catch(e) { }

    $('#notes div.form').empty();

    var notes = getCurrentNotes();
    // Replace notes with empty string if there are no notes
    // Otherwise it fails silently and does not remove old notes
    if (notes.length === 0) {
      notes = "";
    } else {
      notes = notes.html();
    }

    $('#notes').html(notes);

    var sections = getCurrentSections();

    var ul = $('.section-selector').empty();
    if(sections.size() > 0) {
      sections.each( function (idx, value) {
        var li = $('<li>').prependTo(ul);
        var a  = $('<a/>')
                      .text(value)
                      .attr('href','javascript:setCurrentSection("'+value+'");')
                      .appendTo(li);

        if(section === value) {
          li.addClass('selected');
        }
      });
    }

    var nextIndex = slidenum + 1;
    var nextSlide = (nextIndex >= slides.size()) ? $('') : slides.eq(nextIndex);
    var nextThumb = $('#nextSlide .container');
    var prevSlide = (slidenum > 0) ? slides.eq(slidenum - 1) : $('');
    var prevThumb = $('#prevSlide .container');

    nextThumb.html(nextSlide.html());
    prevThumb.html(prevSlide.html());

    copyBackground(nextSlide, nextThumb);
    copyBackground(prevSlide, prevThumb);

    if (windowIsOpen(nextWindow)) {
      $(nextWindow.document.body).html(nextSlide.html());
    }

    if (windowIsOpen(notesWindow)) {
      $(notesWindow.document.body).html(notes);
    }

		var fileName = currentSlide.children('div').first().attr('ref');
		$('#slideFile').text(fileName);
    $('#progress').progressbar({ max: slideTotal })
                  .progressbar('value', slidenum+1);

    $("#notes div.form.wrapper").each(function(e) {
      renderFormInterval = renderFormWatcher($(this));
    });

    if(currentSlide.hasClass('activity')) {
      currentSlide.children('.activityToggle').replaceWith('<span class="count">0</span>');
    }
	}
}

function presenterKeyDown(event){
  var key = event.keyCode;

  debug('keyDown: ' + key);
  // avoid overriding browser commands
  if (event.ctrlKey || event.altKey || event.metaKey) {
    return true;
  }

  switch(getAction(event)) {
    case 'DEBUG':     toggleDebug();      break;
    case 'PREV':      presPrevStep();     break; // Watch that this uses presPrevStep and not prevStep
    case 'PREVSEC':   presPrevSec();      break; // Same here
    case 'NEXT':      presNextStep();     break; // Same here
    case 'NEXTSEC':   presNextSec();      break; // Same here
    case 'REFRESH':   reloadSlides();     break;
    case 'RELOAD':    reloadSlides(true); break;
    case 'CONTENTS':  toggleContents();   break;
    case 'HELP':      toggleHelp();       break;
    case 'BLANK':     blankScreen();      break;
    case 'FOOTER':    toggleFooter();     break;
    case 'FOLLOW':    toggleFollow();     break;
    case 'NOTES':     toggleNotes();      break;
    case 'PAUSE':     togglePause();      break;
    case 'PRESHOW':   togglePreShow();    break;
    case 'CLEAR':
      removeResults();
      try {
        slaveWindow.removeResults();
      } catch (e) {}
      break;
    case 'EXECUTE':
      debug('executeCode');
      executeVisibleCodeBlock();
      try {
         slaveWindow.executeVisibleCodeBlock();
      } catch (e) {}
      break;
    default:
      switch (key) {
        case 48: // 0
        case 49: // 1
        case 50: // 2
        case 51: // 3
        case 52: // 4
        case 53: // 5
        case 54: // 6
        case 55: // 7
        case 56: // 8
        case 57: // 9
          // concatenate numbers from previous keypress events
          gotoSlidenum = gotoSlidenum * 10 + (key - 48);
          break;
        case 13: // enter/return
          // check for a combination of numbers from previous keypress events
          if (gotoSlidenum > 0) {
            debug('go to ' + gotoSlidenum);
            slidenum = gotoSlidenum - 1;
            showSlide(true);
            try {
              slaveWindow.slidenum = gotoSlidenum - 1;
              slaveWindow.showSlide(true);
            } catch (e) {}
            gotoSlidenum = 0;
          }
          break;
        default:
          break;
      }
      break;
    }
  return true;
}

//* TIMER *//

var timerRunning   = false;
var timerIntervals = [];

function startTimer() {
  timerRunning = true;

  $("#timerLabel").hide();
  $("#minStart").hide();

  $('#stopTimer').val('Cancel');
  $("#stopTimer").show();
  $("#pauseTimer").show();
  $("#timerDisplay").show();
  $("#timerSection").addClass('open');

  // keep the sidebar open while the timer is active
  pinSidebar('timer');

  var time = parseInt( $("#timerMinutes").val() ) * 60;
  if(time) {
    $('#timerDisplay')
        .attr('data-timer', time)
        .TimeCircles({
          direction:       'Counter-clockwise',
          total_duration:  time,
          count_past_zero: false,
          time: {
            Days:    { show: false },
            Hours:   { show: false },
            Seconds: { show: false },
          }
        }).addListener(timerProgress);

    // add 60 seconds to each interval because the timer works on floor()
    timerIntervals = [ time/2+60, time/4+60, time/8+60, time/16+60 ]
  }
}

function timerProgress(unit, value, total){

  if (timerIntervals.length > 0) {
    if (total < timerIntervals[0]) {

      ts = $('#timerSection');

      // clear all classes except for the one sizing the container
      ts.attr('class', 'open');

      // remove all the intervals we've already passed
      timerIntervals = timerIntervals.filter(function(val) { return val < total });

      switch(timerIntervals.length) {
        case 3:   ts.addClass('intervalHalf');      break;
        case 2:   ts.addClass('intervalQuarter');   break;
        case 1:   ts.addClass('intervalWarning');   break;
        case 0:
          ts.addClass('intervalCritical');
          $("#timerDisplay").TimeCircles({circle_bg_color: "red"});

          // when timing short durations, sometimes the last interval doesn't get triggered until we end.
          if( $("#timerDisplay").TimeCircles().getTime() <= 0 ) {
            endTimer();
          }
          break;
      }
    }
  }
  else {
    endTimer();
  }
}

function toggleTimer() {
  if (!timerRunning) {
    timerRunning = true;
    $('#pauseTimer').val('Pause');
    $('#timerDisplay').removeClass('paused');
    $("#timerDisplay").TimeCircles().start();
  }
   else {
    timerRunning = false;
    $('#pauseTimer').val('Resume');
    $('#timerDisplay').addClass('paused');
    $("#timerDisplay").TimeCircles().stop();
  }
}

function endTimer() {
  $('#stopTimer').val('Reset');
  $("#pauseTimer").hide();

  // don't unpin yet, we don't want the timer to just wander off into the distance!
}

function stopTimer() {
  $("#timerDisplay").removeData('timer');
  $("#timerDisplay").TimeCircles().destroy();

  $("#timerLabel").show();
  $("#minStart").show();

  $("#stopTimer").hide();
  $("#pauseTimer").hide();
  $("#timerDisplay").hide();
  $('#timerSection').removeClass();

  // only unpin when the user has dismissed the timer
  unpinSidebar('timer');
}

function initializeSettings() {
  // enable this if we are the "master" presenter
  $("#followerToggle").prop("checked", master);
  mode.update = $("#followerToggle").prop("checked");
}

/********************
 Follower Code
 ********************/
function toggleFollower()
{
  mode.follow = $("#remoteToggle").prop("checked");
  getPosition();
}

function toggleUpdater()
{
  mode.update = $("#followerToggle").prop("checked");
  update();
}

/********************
 Annotations
 ********************/
function toggleAnnotations() {
  mode.annotations = $("#annotationsToggle").prop("checked");

  if(mode.annotations) {
    $('#annotationToolbar').show();
    $('canvas.annotations').show();
    if (typeof(currentSlide) != 'undefined') {
      currentSlide.find('canvas.annotations').annotate(annotations);
    }
  }
  else {
    $('#annotationToolbar').hide();
    $('canvas.annotations').stopAnnotation();
    $('canvas.annotations').hide();
  }
}

function openNext() {
  $("#nextWindowConfirmation").hide();
  try {
    if(windowIsClosed(nextWindow)){
      nextWindow = blankStyledWindow("Next Slide Preview", 'width=320,height=300', 'next');

      // Firefox doesn't load content properly unless we delay it slightly. Yay for race conditions.
//      nextWindow.addEventListener("unload", function() {
      window.setTimeout(function() {
        // call back and update the parent presenter if the window is closed
        nextWindow.onunload = function(e) {
          nextWindow.opener.chooseLayout('default');
        };

        postSlide();
      }, 500);
      $("#settings-modal").dialog("close");
    }
  }
  catch(e) {
    console.log(e);
    console.log('Failed to open or connect next window. Popup blocker?');
  }
}

/********************
 Layout selection incorporates previews and the old next window
 ********************/
function chooseLayout(layout)
{
  // yay for half-baked data storage schemes
  layout = layout || document.cookieHash['layout'] || 'default';

  // in case we're being called externally, make the UI match
  $('#layoutSelector').val(layout);
  $("#nextWindowConfirmation").hide();
  console.log("Setting layout to " + layout);

  // change focus so we don't inadvertently change layout again by changing slides
  $("#preview").focus();
  $("#layoutSelector").blur();

  // what we are switching *from*
  switch(mode.layout) {
    case 'thumbs':
      $('#preview').removeClass('thumbs');
      $('#preview .thumb').hide();
      break;

    case 'beside':
      $('#preview').removeClass('beside');
      $('#preview #nextSlide .container').removeAttr("style");
      $('#preview #nextSlide').hide();
      break;

    case 'floating':
      try {
        if (nextWindow) {
          // unregister the event so we don't accidentally double-fire
          nextWindow.window.onunload = null;
          nextWindow.close();
        }
      }
      catch (e) {
        console.log(e);
        console.log('Next window failed to close properly.');
      }
      break;

    default:

  }

  // what we are switching *to*
  switch(layout) {
    case 'thumbs':
      $('#preview').addClass('thumbs');
      $('#preview .thumb').show();
      break;

    case 'beside':
      $('#preview').addClass('beside');
      $('#preview #nextSlide').show();

      var w = $('#nextSlide .container').width();
      $('#nextSlide .container').height(w*.75)
      break;

    case 'floating':
      $("#nextWindowConfirmation").show();
      break;

    default:

  }

  document.cookie = "layout="+layout
  mode.layout = layout;
  zoom(true);
}