/*

File: script.js

Abstract: HTML5 Video Element Overlays

Version: 1.1

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Software, with or without modifications, in source and/or binary forms;

provided that if you redistribute the Apple Software in its entirety and

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text and disclaimers in all such redistributions of the Apple Software. 

Neither the name, trademarks, service marks or logos of Apple Inc. 

may be used to endorse or promote products derived from the Apple

Software without specific prior written permission from Apple.  Except

as expressly stated in this notice, no other rights or licenses, express

or implied, are granted by Apple herein, including but not limited to

any patent rights that may be infringed by your derivative works or by

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The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS

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*/

function init() {

  var down = "mousedown"; var up = "mouseup"; 

  if ('createTouch' in document) { down = "touchstart"; up ="touchend"; }

  /* toggle appearance of all buttons when clicked or tapped, add additional listeners */

  var buttons = document.getElementsByClassName("button");

  for (var b = 0; b < buttons.length; b++) {

    buttons[b].addEventListener(up, function(evt) {toggleButtonAppearance(evt);}, false);

    buttons[b].addEventListener(down, function(evt) {toggleButtonAppearance(evt);}, false); 

    switch (buttons[b].id) {   

      /* handler for our 'status' div - it shows the 'Click to Play' button, progress indicator, and error indicator */   

      case "status":

        buttons[b].addEventListener(up, function(evt) {loadVideo(evt);}, false);

        break;

      /* toggle playback and the appearance of the play/pause button, once this button is clicked or tapped */

      case "playPauseButton":

        buttons[b].addEventListener(up, function(evt) {togglePlayPause(evt);}, false); 

        break;

      /* go fullscreen, once this button is clicked or tapped */

      case "fullscreenButton":

        buttons[b].addEventListener(up, function() {document.querySelector("video").webkitEnterFullscreen();}, false);

        break;

    }

  }

}

function toggleButtonAppearance(evt) {  

  var button = evt.target;

  var buttonState = button.className;

  button.className = buttonState.match(/active/) ? buttonState.split("active")[0] : buttonState + " active";

}

function loadVideo(evt) {

  evt.target.className = "progress showing";

  var myVideo = document.querySelector("video");

  myVideo.addEventListener("canplaythrough", playVideo, false);

  myVideo.addEventListener("error", reportError, false);  

  myVideo.load();

}

function playVideo() {

  /* hide the status div and image overlay */

  document.getElementById("overlay").className = "hidden";  

  document.getElementById("status").className = "hidden";

  /* play the video */

  document.querySelector("video").play(); 

  /* Show the play/pause button, in paused state. */

  document.getElementById("playPauseButton").className = "pause button showing";

  /* Only show our fullscreen button if going fullscreen programmatically is supported. */

  /* You can check to see if fullscreen mode is supported as soon as the media metadata has been loaded - in other words, once a loadedmetadata event is emitted.

  In this example, we're checking to see if fullscreen mode is supported once canplay is emitted.  canplay is emitted after loadedmetadata, so this is safe. */

  if (document.querySelector("video").webkitSupportsFullscreen) {

    document.getElementById("fullscreenButton").className = "fullscreen button showing";

  }

}

function reportError() {

  document.getElementById("status").className = "error button showing";

}

function togglePlayPause(evt) {

  var playPauseButton = evt.target;

  var myVideo = document.querySelector("video");

  if (myVideo.paused) {

    myVideo.play();

    playPauseButton.className = "pause button showing";

  }

  else {

    myVideo.pause();

    playPauseButton.className = "play button showing";

  }

}