;(function(exports){'use strict';var TutorialUtils={loadMedia:function(mediaElement,src){console.log('loadMedia, got mediaElement: ',mediaElement);var isVideo=(mediaElement.nodeName==='VIDEO');console.log('TutorialUtils.loadMedia, isVideo: ',isVideo,mediaElement.nodeName);return new Promise(function(resolve,reject){function onMediaLoadOrError(evt){console.log('TutorialUtils.loadMedia, onMediaLoadOrError for '+'evt.type: '+(evt&&evt.type));evt.target.removeEventListener('error',onMediaLoadOrError);if(isVideo){evt.target.removeEventListener('canplay',onMediaLoadOrError);evt.target.removeEventListener('abort',onMediaLoadOrError);}else{evt.target.removeEventListener('load',onMediaLoadOrError);}
if(evt.type==='error'){console.error('Failed to load tutorial media: '+src);}else if(evt.type==='abort'){console.error('Loading of tutorial media aborted: '+src);}
resolve(evt);}
function onVideoUnloaded(evt){console.log('TutorialUtils.loadMedia, onVideoUnloaded for evt.type: '+
(evt&&evt.type));mediaElement.removeEventListener('emptied',onVideoUnloaded);mediaElement.addEventListener('canplay',onMediaLoadOrError);mediaElement.addEventListener('abort',onMediaLoadOrError);mediaElement.addEventListener('error',onMediaLoadOrError);console.log('TutorialUtils.loadMedia, onVideoUnloaded, '+'assigning src: '+src);mediaElement.src=src;mediaElement.load();}
if(isVideo){if(mediaElement.src){console.log('TutorialUtils.loadMedia, removing src attribute');mediaElement.removeAttribute('src');mediaElement.addEventListener('emptied',onVideoUnloaded,false);console.log('TutorialUtils.loadMedia, calling load');mediaElement.load();}else{console.log('TutorialUtils.loadMedia, no src, '+'just calling onVideoUnloaded');onVideoUnloaded();}}else{console.log('TutorialUtils.loadMedia, not a video, '+'listen for load/error only');mediaElement.addEventListener('load',onMediaLoadOrError,false);mediaElement.addEventListener('error',onMediaLoadOrError,false);mediaElement.src=src;}});},loadAndPlayMedia:function(mediaElement,src){return this.loadMedia(mediaElement,src).then((evt)=>{if(evt.type!=='error'&&mediaElement.nodeName==='VIDEO'){mediaElement.play();}});},fileExists:function(src){return new Promise((resolve)=>{window.fetch(src,{method:'HEAD'}).then((response)=>{resolve(response.ok);}).catch(()=>{resolve(false);});});},getBestAssetForDirection:function(src){var dir=document.dir||'ltr';var re=/(-rtl|ltr)?\.(png|gif|jpg|webm|mp4|m4v|ogg|ogv)$/;var directionSrc=src.replace(re,'-'+dir+'.$2');return this.fileExists(directionSrc).then((result)=>{return result?directionSrc:src;}).catch((e)=>{console.log('Exception from getBestAssetForDirection: ',e);});},Sequence:function(){var sequence=Array.slice(arguments);var aborted=false;sequence.abort=function(){aborted=true;this.length=0;if(typeof this.onabort==='function'){this.onabort();}};sequence.complete=function(result){if(!aborted&&typeof this.oncomplete==='function'){this.oncomplete(result);}};sequence.fail=function(reason){this.complete(reason);};sequence.next=function(previousTaskResult){var result,exception;if(aborted){return;}
var task=this.shift();if(task){try{result=task.apply(null,arguments);}catch(e){exception=e;}
if(exception){this.fail(exception);}else if(result&&typeof result.then==='function'){result.then(this.next.bind(this),this.fail.bind(this));}else{this.next(result);}}else{this.complete(previousTaskResult);}};return sequence;}};exports.TutorialUtils=TutorialUtils;})(window);