<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">

  <title>Speaker Notes</title>

  <style>
    body {
      font-family: Helvetica;
      font-size: 18px;
    }

    #current-slide,
    #upcoming-slide,
    #speaker-controls {
      padding: 6px;
      box-sizing: border-box;
      -moz-box-sizing: border-box;
    }

    #current-slide iframe,
    #upcoming-slide iframe {
      width: 100%;
      height: 100%;
      border: 1px solid #ddd;
    }

    #current-slide .label,
    #upcoming-slide .label {
      position: absolute;
      top: 10px;
      left: 10px;
      z-index: 2;
    }

    #connection-status {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 20;
      padding: 30% 20% 20% 20%;
      font-size: 18px;
      color: #222;
      background: #fff;
      text-align: center;
      box-sizing: border-box;
      line-height: 1.4;
    }

    .overlay-element {
      height: 34px;
      line-height: 34px;
      padding: 0 10px;
      text-shadow: none;
      background: rgba( 220, 220, 220, 0.8 );
      color: #222;
      font-size: 14px;
    }

    .overlay-element.interactive:hover {
      background: rgba( 220, 220, 220, 1 );
    }

    #current-slide {
      position: absolute;
      width: 60%;
      height: 100%;
      top: 0;
      left: 0;
      padding-right: 0;
    }

    #upcoming-slide {
      position: absolute;
      width: 40%;
      height: 40%;
      right: 0;
      top: 0;
    }

    /* Speaker controls */
    #speaker-controls {
      position: absolute;
      top: 40%;
      right: 0;
      width: 40%;
      height: 60%;
      overflow: auto;
      font-size: 18px;
    }

    .speaker-controls-time.hidden,
    .speaker-controls-notes.hidden {
      display: none;
    }

    .speaker-controls-time .label,
    .speaker-controls-pace .label,
    .speaker-controls-notes .label {
      text-transform: uppercase;
      font-weight: normal;
      font-size: 0.66em;
      color: #666;
      margin: 0;
    }

    .speaker-controls-time, .speaker-controls-pace {
      border-bottom: 1px solid rgba( 200, 200, 200, 0.5 );
      margin-bottom: 10px;
      padding: 10px 16px;
      padding-bottom: 20px;
      cursor: pointer;
    }

    .speaker-controls-time .reset-button {
      opacity: 0;
      float: right;
      color: #666;
      text-decoration: none;
    }
    .speaker-controls-time:hover .reset-button {
      opacity: 1;
    }

    .speaker-controls-time .timer,
    .speaker-controls-time .clock {
      width: 50%;
    }

    .speaker-controls-time .timer,
    .speaker-controls-time .clock,
    .speaker-controls-time .pacing .hours-value,
    .speaker-controls-time .pacing .minutes-value,
    .speaker-controls-time .pacing .seconds-value {
      font-size: 1.9em;
    }

    .speaker-controls-time .timer {
      float: left;
    }

    .speaker-controls-time .clock {
      float: right;
      text-align: right;
    }

    .speaker-controls-time span.mute {
      opacity: 0.3;
    }

    .speaker-controls-time .pacing-title {
      margin-top: 5px;
    }

    .speaker-controls-time .pacing.ahead {
      color: blue;
    }

    .speaker-controls-time .pacing.on-track {
      color: green;
    }

    .speaker-controls-time .pacing.behind {
      color: red;
    }

    .speaker-controls-notes {
      padding: 10px 16px;
    }

    .speaker-controls-notes .value {
      margin-top: 5px;
      line-height: 1.4;
      font-size: 1.2em;
    }

    /* Layout selector */
    #speaker-layout {
      position: absolute;
      top: 10px;
      right: 10px;
      color: #222;
      z-index: 10;
    }
    #speaker-layout select {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      border: 0;
      box-shadow: 0;
      cursor: pointer;
      opacity: 0;

      font-size: 1em;
      background-color: transparent;

      -moz-appearance: none;
      -webkit-appearance: none;
      -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
    }

    #speaker-layout select:focus {
      outline: none;
      box-shadow: none;
    }

    .clear {
      clear: both;
    }

    /* Speaker layout: Wide */
    body[data-speaker-layout="wide"] #current-slide,
    body[data-speaker-layout="wide"] #upcoming-slide {
      width: 50%;
      height: 45%;
      padding: 6px;
    }

    body[data-speaker-layout="wide"] #current-slide {
      top: 0;
      left: 0;
    }

    body[data-speaker-layout="wide"] #upcoming-slide {
      top: 0;
      left: 50%;
    }

    body[data-speaker-layout="wide"] #speaker-controls {
      top: 45%;
      left: 0;
      width: 100%;
      height: 50%;
      font-size: 1.25em;
    }

    /* Speaker layout: Tall */
    body[data-speaker-layout="tall"] #current-slide,
    body[data-speaker-layout="tall"] #upcoming-slide {
      width: 45%;
      height: 50%;
      padding: 6px;
    }

    body[data-speaker-layout="tall"] #current-slide {
      top: 0;
      left: 0;
    }

    body[data-speaker-layout="tall"] #upcoming-slide {
      top: 50%;
      left: 0;
    }

    body[data-speaker-layout="tall"] #speaker-controls {
      padding-top: 40px;
      top: 0;
      left: 45%;
      width: 55%;
      height: 100%;
      font-size: 1.25em;
    }

    /* Speaker layout: Notes only */
    body[data-speaker-layout="notes-only"] #current-slide,
    body[data-speaker-layout="notes-only"] #upcoming-slide {
      display: none;
    }

    body[data-speaker-layout="notes-only"] #speaker-controls {
      padding-top: 40px;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      font-size: 1.25em;
    }

    @media screen and (max-width: 1080px) {
      body[data-speaker-layout="default"] #speaker-controls {
        font-size: 16px;
      }
    }

    @media screen and (max-width: 900px) {
      body[data-speaker-layout="default"] #speaker-controls {
        font-size: 14px;
      }
    }

    @media screen and (max-width: 800px) {
      body[data-speaker-layout="default"] #speaker-controls {
        font-size: 12px;
      }
    }

  </style>
</head>

<body>

<div id="connection-status">Loading speaker view...</div>

<div id="current-slide"></div>
<div id="upcoming-slide"><span class="overlay-element label">Upcoming</span></div>
<div id="speaker-controls">
  <div class="speaker-controls-time">
    <h4 class="label">Time <span class="reset-button">Click to Reset</span></h4>
    <div class="clock">
      <span class="clock-value">0:00 AM</span>
    </div>
    <div class="timer">
      <span class="hours-value">00</span><span class="minutes-value">:00</span><span class="seconds-value">:00</span>
    </div>
    <div class="clear"></div>

    <h4 class="label pacing-title" style="display: none">Pacing – Time to finish current slide</h4>
    <div class="pacing" style="display: none">
      <span class="hours-value">00</span><span class="minutes-value">:00</span><span class="seconds-value">:00</span>
    </div>
  </div>

  <div class="speaker-controls-notes hidden">
    <h4 class="label">Notes</h4>
    <div class="value"></div>
  </div>
</div>
<div id="speaker-layout" class="overlay-element interactive">
  <span class="speaker-layout-label"></span>
  <select class="speaker-layout-dropdown"></select>
</div>

<script src="../../plugin/markdown/marked.js"></script>
<script>

  (function() {

    var notes,
      notesValue,
      currentState,
      currentSlide,
      upcomingSlide,
      layoutLabel,
      layoutDropdown,
      pendingCalls = {},
      lastRevealApiCallId = 0,
      connected = false;

    var SPEAKER_LAYOUTS = {
      'default': 'Default',
      'wide': 'Wide',
      'tall': 'Tall',
      'notes-only': 'Notes only'
    };

    setupLayout();

    var connectionStatus = document.querySelector( '#connection-status' );
    var connectionTimeout = setTimeout( function() {
      connectionStatus.innerHTML = 'Error connecting to main window.<br>Please try closing and reopening the speaker view.';
    }, 5000 );

    window.addEventListener( 'message', function( event ) {

      clearTimeout( connectionTimeout );
      connectionStatus.style.display = 'none';

      var data = JSON.parse( event.data );

      // The overview mode is only useful to the reveal.js instance
      // where navigation occurs so we don't sync it
      if( data.state ) delete data.state.overview;

      // Messages sent by the notes plugin inside of the main window
      if( data && data.namespace === 'reveal-notes' ) {
        if( data.type === 'connect' ) {
          handleConnectMessage( data );
        }
        else if( data.type === 'state' ) {
          handleStateMessage( data );
        }
        else if( data.type === 'return' ) {
          pendingCalls[data.callId](data.result);
          delete pendingCalls[data.callId];
        }
      }
      // Messages sent by the reveal.js inside of the current slide preview
      else if( data && data.namespace === 'reveal' ) {
        if( /ready/.test( data.eventName ) ) {
          // Send a message back to notify that the handshake is complete
          window.opener.postMessage( JSON.stringify({ namespace: 'reveal-notes', type: 'connected'} ), '*' );
        }
        else if( /slidechanged|fragmentshown|fragmenthidden|paused|resumed/.test( data.eventName ) && currentState !== JSON.stringify( data.state ) ) {

          window.opener.postMessage( JSON.stringify({ method: 'setState', args: [ data.state ]} ), '*' );

        }
      }

    } );

    /**
     * Asynchronously calls the Reveal.js API of the main frame.
     */
    function callRevealApi( methodName, methodArguments, callback ) {

      var callId = ++lastRevealApiCallId;
      pendingCalls[callId] = callback;
      window.opener.postMessage( JSON.stringify( {
        namespace: 'reveal-notes',
        type: 'call',
        callId: callId,
        methodName: methodName,
        arguments: methodArguments
      } ), '*' );

    }

    /**
     * Called when the main window is trying to establish a
     * connection.
     */
    function handleConnectMessage( data ) {

      if( connected === false ) {
        connected = true;

        setupIframes( data );
        setupKeyboard();
        setupNotes();
        setupTimer();
      }

    }

    /**
     * Called when the main window sends an updated state.
     */
    function handleStateMessage( data ) {

      // Store the most recently set state to avoid circular loops
      // applying the same state
      currentState = JSON.stringify( data.state );

      // No need for updating the notes in case of fragment changes
      if ( data.notes ) {
        notes.classList.remove( 'hidden' );
        notesValue.style.whiteSpace = data.whitespace;
        if( data.markdown ) {
          notesValue.innerHTML = marked( data.notes );
        }
        else {
          notesValue.innerHTML = data.notes;
        }
      }
      else {
        notes.classList.add( 'hidden' );
      }

      // Update the note slides
      currentSlide.contentWindow.postMessage( JSON.stringify({ method: 'setState', args: [ data.state ] }), '*' );
      upcomingSlide.contentWindow.postMessage( JSON.stringify({ method: 'setState', args: [ data.state ] }), '*' );
      upcomingSlide.contentWindow.postMessage( JSON.stringify({ method: 'next' }), '*' );

    }

    // Limit to max one state update per X ms
    handleStateMessage = debounce( handleStateMessage, 200 );

    /**
     * Forward keyboard events to the current slide window.
     * This enables keyboard events to work even if focus
     * isn't set on the current slide iframe.
     *
     * Block F5 default handling, it reloads and disconnects
     * the speaker notes window.
     */
    function setupKeyboard() {

      document.addEventListener( 'keydown', function( event ) {
        if( event.keyCode === 116 || ( event.metaKey && event.keyCode === 82 ) ) {
          event.preventDefault();
          return false;
        }
        currentSlide.contentWindow.postMessage( JSON.stringify({ method: 'triggerKey', args: [ event.keyCode ] }), '*' );
      } );

    }

    /**
     * Creates the preview iframes.
     */
    function setupIframes( data ) {

      var params = [
        'receiver',
        'progress=false',
        'history=false',
        'transition=none',
        'autoSlide=0',
        'backgroundTransition=none'
      ].join( '&' );

      var urlSeparator = /\?/.test(data.url) ? '&' : '?';
      var hash = '#/' + data.state.indexh + '/' + data.state.indexv;
      var currentURL = data.url + urlSeparator + params + '&postMessageEvents=true' + hash;
      var upcomingURL = data.url + urlSeparator + params + '&controls=false' + hash;

      currentSlide = document.createElement( 'iframe' );
      currentSlide.setAttribute( 'width', 1280 );
      currentSlide.setAttribute( 'height', 1024 );
      currentSlide.setAttribute( 'src', currentURL );
      document.querySelector( '#current-slide' ).appendChild( currentSlide );

      upcomingSlide = document.createElement( 'iframe' );
      upcomingSlide.setAttribute( 'width', 640 );
      upcomingSlide.setAttribute( 'height', 512 );
      upcomingSlide.setAttribute( 'src', upcomingURL );
      document.querySelector( '#upcoming-slide' ).appendChild( upcomingSlide );

    }

    /**
     * Setup the notes UI.
     */
    function setupNotes() {

      notes = document.querySelector( '.speaker-controls-notes' );
      notesValue = document.querySelector( '.speaker-controls-notes .value' );

    }

    function getTimings( callback ) {

      callRevealApi( 'getSlidesAttributes', [], function ( slideAttributes ) {
        callRevealApi( 'getConfig', [], function ( config ) {
          var defaultTiming = config.defaultTiming;
          if (defaultTiming == null) {
            callback(null);
            return;
          }

          var timings = [];
          for ( var i in slideAttributes ) {
            var slide = slideAttributes[ i ];
            var timing = defaultTiming;
            if( slide.hasOwnProperty( 'data-timing' )) {
              var t = slide[ 'data-timing' ];
              timing = parseInt(t);
              if( isNaN(timing) ) {
                console.warn("Could not parse timing '" + t + "' of slide " + i + "; using default of " + defaultTiming);
                timing = defaultTiming;
              }
            }
            timings.push(timing);
          }

          callback( timings );
        } );
      } );

    }

    /**
     * Return the number of seconds allocated for presenting
     * all slides up to and including this one.
     */
    function getTimeAllocated( timings, callback ) {

      callRevealApi( 'getSlidePastCount', [], function ( currentSlide ) {
        var allocated = 0;
        for (var i in timings.slice(0, currentSlide + 1)) {
          allocated += timings[i];
        }
        callback( allocated );
      } );

    }

    /**
     * Create the timer and clock and start updating them
     * at an interval.
     */
    function setupTimer() {

      var start = new Date(),
        timeEl = document.querySelector( '.speaker-controls-time' ),
        clockEl = timeEl.querySelector( '.clock-value' ),
        hoursEl = timeEl.querySelector( '.hours-value' ),
        minutesEl = timeEl.querySelector( '.minutes-value' ),
        secondsEl = timeEl.querySelector( '.seconds-value' ),
        pacingTitleEl = timeEl.querySelector( '.pacing-title' ),
        pacingEl = timeEl.querySelector( '.pacing' ),
        pacingHoursEl = pacingEl.querySelector( '.hours-value' ),
        pacingMinutesEl = pacingEl.querySelector( '.minutes-value' ),
        pacingSecondsEl = pacingEl.querySelector( '.seconds-value' );

      var timings = null;
      getTimings( function ( _timings ) {

        timings = _timings;
        if (_timings !== null) {
          pacingTitleEl.style.removeProperty('display');
          pacingEl.style.removeProperty('display');
        }

        // Update once directly
        _updateTimer();

        // Then update every second
        setInterval( _updateTimer, 1000 );

      } );


      function _resetTimer() {

        if (timings == null) {
          start = new Date();
          _updateTimer();
        }
        else {
          // Reset timer to beginning of current slide
          getTimeAllocated( timings, function ( slideEndTimingSeconds ) {
            var slideEndTiming = slideEndTimingSeconds * 1000;
            callRevealApi( 'getSlidePastCount', [], function ( currentSlide ) {
              var currentSlideTiming = timings[currentSlide] * 1000;
              var previousSlidesTiming = slideEndTiming - currentSlideTiming;
              var now = new Date();
              start = new Date(now.getTime() - previousSlidesTiming);
              _updateTimer();
            } );
          } );
        }

      }

      timeEl.addEventListener( 'click', function() {
        _resetTimer();
        return false;
      } );

      function _displayTime( hrEl, minEl, secEl, time) {

        var sign = Math.sign(time) == -1 ? "-" : "";
        time = Math.abs(Math.round(time / 1000));
        var seconds = time % 60;
        var minutes = Math.floor( time / 60 ) % 60 ;
        var hours = Math.floor( time / ( 60 * 60 )) ;
        hrEl.innerHTML = sign + zeroPadInteger( hours );
        if (hours == 0) {
          hrEl.classList.add( 'mute' );
        }
        else {
          hrEl.classList.remove( 'mute' );
        }
        minEl.innerHTML = ':' + zeroPadInteger( minutes );
        if (hours == 0 && minutes == 0) {
          minEl.classList.add( 'mute' );
        }
        else {
          minEl.classList.remove( 'mute' );
        }
        secEl.innerHTML = ':' + zeroPadInteger( seconds );
      }

      function _updateTimer() {

        var diff, hours, minutes, seconds,
          now = new Date();

        diff = now.getTime() - start.getTime();

        clockEl.innerHTML = now.toLocaleTimeString( 'en-US', { hour12: true, hour: '2-digit', minute:'2-digit' } );
        _displayTime( hoursEl, minutesEl, secondsEl, diff );
        if (timings !== null) {
          _updatePacing(diff);
        }

      }

      function _updatePacing(diff) {

        getTimeAllocated( timings, function ( slideEndTimingSeconds ) {
          var slideEndTiming = slideEndTimingSeconds * 1000;

          callRevealApi( 'getSlidePastCount', [], function ( currentSlide ) {
            var currentSlideTiming = timings[currentSlide] * 1000;
            var timeLeftCurrentSlide = slideEndTiming - diff;
            if (timeLeftCurrentSlide < 0) {
              pacingEl.className = 'pacing behind';
            }
            else if (timeLeftCurrentSlide < currentSlideTiming) {
              pacingEl.className = 'pacing on-track';
            }
            else {
              pacingEl.className = 'pacing ahead';
            }
            _displayTime( pacingHoursEl, pacingMinutesEl, pacingSecondsEl, timeLeftCurrentSlide );
          } );
        } );
      }

    }

    /**
     * Sets up the speaker view layout and layout selector.
     */
    function setupLayout() {

      layoutDropdown = document.querySelector( '.speaker-layout-dropdown' );
      layoutLabel = document.querySelector( '.speaker-layout-label' );

      // Render the list of available layouts
      for( var id in SPEAKER_LAYOUTS ) {
        var option = document.createElement( 'option' );
        option.setAttribute( 'value', id );
        option.textContent = SPEAKER_LAYOUTS[ id ];
        layoutDropdown.appendChild( option );
      }

      // Monitor the dropdown for changes
      layoutDropdown.addEventListener( 'change', function( event ) {

        setLayout( layoutDropdown.value );

      }, false );

      // Restore any currently persisted layout
      setLayout( getLayout() );

    }

    /**
     * Sets a new speaker view layout. The layout is persisted
     * in local storage.
     */
    function setLayout( value ) {

      var title = SPEAKER_LAYOUTS[ value ];

      layoutLabel.innerHTML = 'Layout' + ( title ? ( ': ' + title ) : '' );
      layoutDropdown.value = value;

      document.body.setAttribute( 'data-speaker-layout', value );

      // Persist locally
      if( supportsLocalStorage() ) {
        window.localStorage.setItem( 'reveal-speaker-layout', value );
      }

    }

    /**
     * Returns the ID of the most recently set speaker layout
     * or our default layout if none has been set.
     */
    function getLayout() {

      if( supportsLocalStorage() ) {
        var layout = window.localStorage.getItem( 'reveal-speaker-layout' );
        if( layout ) {
          return layout;
        }
      }

      // Default to the first record in the layouts hash
      for( var id in SPEAKER_LAYOUTS ) {
        return id;
      }

    }

    function supportsLocalStorage() {

      try {
        localStorage.setItem('test', 'test');
        localStorage.removeItem('test');
        return true;
      }
      catch( e ) {
        return false;
      }

    }

    function zeroPadInteger( num ) {

      var str = '00' + parseInt( num );
      return str.substring( str.length - 2 );

    }

    /**
     * Limits the frequency at which a function can be called.
     */
    function debounce( fn, ms ) {

      var lastTime = 0,
        timeout;

      return function() {

        var args = arguments;
        var context = this;

        clearTimeout( timeout );

        var timeSinceLastCall = Date.now() - lastTime;
        if( timeSinceLastCall > ms ) {
          fn.apply( context, args );
          lastTime = Date.now();
        }
        else {
          timeout = setTimeout( function() {
            fn.apply( context, args );
            lastTime = Date.now();
          }, ms - timeSinceLastCall );
        }

      }

    }

  })();

</script>
</body>
</html>