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/**
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 * A plugin which enables rendering of math equations inside
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 * of reveal.js slides. Essentially a thin wrapper for MathJax.
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 *
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 * @author Hakim El Hattab
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 */
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var RevealMath = window.RevealMath || (function(){
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	var options = Reveal.getConfig().math || {};
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	options.mathjax = options.mathjax || 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js';
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	options.config = options.config || 'TeX-AMS_HTML-full';
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	loadScript( options.mathjax + '?config=' + options.config, function() {
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		MathJax.Hub.Config({
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			messageStyle: 'none',
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			tex2jax: {
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				inlineMath: [['$','$'],['\\(','\\)']] ,
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				skipTags: ['script','noscript','style','textarea','pre']
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			},
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			skipStartupTypeset: true
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		});
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		// Typeset followed by an immediate reveal.js layout since
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		// the typesetting process could affect slide height
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		MathJax.Hub.Queue( [ 'Typeset', MathJax.Hub ] );
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		MathJax.Hub.Queue( Reveal.layout );
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		// Reprocess equations in slides when they turn visible
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		Reveal.addEventListener( 'slidechanged', function( event ) {
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			MathJax.Hub.Queue( [ 'Typeset', MathJax.Hub, event.currentSlide ] );
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		} );
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	} );
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	function loadScript( url, callback ) {
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		var head = document.querySelector( 'head' );
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		var script = document.createElement( 'script' );
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		script.type = 'text/javascript';
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		script.src = url;
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		// Wrapper for callback to make sure it only fires once
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		var finish = function() {
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			if( typeof callback === 'function' ) {
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				callback.call();
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				callback = null;
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			}
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		}
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		script.onload = finish;
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		// IE
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		script.onreadystatechange = function() {
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			if ( this.readyState === 'loaded' ) {
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				finish();
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			}
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		}
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		// Normal browsers
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		head.appendChild( script );
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	}
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})();
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