/**

* phantomjs script for printing presentations to PDF.
*
* Example:
* phantomjs print-pdf.js "http://revealjs.com?print-pdf" reveal-demo.pdf
*
* @author Manuel Bieh (https://github.com/manuelbieh)
* @author Hakim El Hattab (https://github.com/hakimel)
* @author Manuel Riezebosch (https://github.com/riezebosch)
*/

// html2pdf.js var system = require( 'system' );

var probePage = new WebPage(); var printPage = new WebPage();

var inputFile = system.args || 'index.html?print-pdf'; var outputFile = system.args || 'slides.pdf';

if( outputFile.match( /.pdf$/gi ) === null ) {

outputFile += '.pdf';

}

console.log( 'Export PDF: Reading reveal.js config [1/4]' );

probePage.open( inputFile, function( status ) {

    console.log( 'Export PDF: Preparing print layout [2/4]' );

    var config = probePage.evaluate( function() {
            return Reveal.getConfig();
    } );

    if( config ) {

            printPage.paperSize = {
                    width: Math.floor( config.width * ( 1 + config.margin ) ),
                    height: Math.floor( config.height * ( 1 + config.margin ) ),
                    border: 0
            };

            printPage.open( inputFile, function( status ) {
                    console.log( 'Export PDF: Preparing pdf [3/4]')
                    printPage.evaluate(function() {
                            Reveal.isReady() ? window.callPhantom() : Reveal.addEventListener( 'pdf-ready', window.callPhantom );
                    });
            } );

            printPage.onCallback = function(data) {
                    // For some reason we need to "jump the queue" for syntax highlighting to work.
                    // See: http://stackoverflow.com/a/3580132/129269
                    setTimeout(function() {
                            console.log( 'Export PDF: Writing file [4/4]' );
                            printPage.render( outputFile );
                            console.log( 'Export PDF: Finished successfully!' );
                            phantom.exit();
                    }, 0);
            };
    }
    else {

    console.log( 'Export PDF: Unable to read reveal.js config. Make sure the input address points to a reveal.js page.' );
    phantom.exit(1);

}

} );