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/**
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 * phantomjs script for printing presentations to PDF.
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 *
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 * Example:
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 * phantomjs print-pdf.js "http://revealjs.com?print-pdf" reveal-demo.pdf
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 *
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 * @author Manuel Bieh (https://github.com/manuelbieh)
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 * @author Hakim El Hattab (https://github.com/hakimel)
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 * @author Manuel Riezebosch (https://github.com/riezebosch)
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 */
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// html2pdf.js
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var system = require( 'system' );
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var probePage = new WebPage();
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var printPage = new WebPage();
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var inputFile = system.args[1] || 'index.html?print-pdf';
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var outputFile = system.args[2] || 'slides.pdf';
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if( outputFile.match( /\.pdf$/gi ) === null ) {
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	outputFile += '.pdf';
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}
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console.log( 'Export PDF: Reading reveal.js config [1/4]' );
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probePage.open( inputFile, function( status ) {
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	console.log( 'Export PDF: Preparing print layout [2/4]' );
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	var config = probePage.evaluate( function() {
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		return Reveal.getConfig();
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	} );
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	if( config ) {
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		printPage.paperSize = {
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			width: Math.floor( config.width * ( 1 + config.margin ) ),
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			height: Math.floor( config.height * ( 1 + config.margin ) ),
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			border: 0
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		};
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		printPage.open( inputFile, function( status ) {
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			console.log( 'Export PDF: Preparing pdf [3/4]')
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			printPage.evaluate(function() {
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				Reveal.isReady() ? window.callPhantom() : Reveal.addEventListener( 'pdf-ready', window.callPhantom );
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			});
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		} );
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		printPage.onCallback = function(data) {
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			// For some reason we need to "jump the queue" for syntax highlighting to work.
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			// See: http://stackoverflow.com/a/3580132/129269
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			setTimeout(function() {
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				console.log( 'Export PDF: Writing file [4/4]' );
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				printPage.render( outputFile );
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				console.log( 'Export PDF: Finished successfully!' );
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				phantom.exit();
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			}, 0);
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		};
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	}
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	else {
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        console.log( 'Export PDF: Unable to read reveal.js config. Make sure the input address points to a reveal.js page.' );
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        phantom.exit(1);
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    }
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} );
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