srt_loader

define(["jquery", "lodash", "bacon"], function($, _, Bacon){

    return function(url, cb) {

        var parseTimeCode = function (timeCodeStr) {
            return _(timeCodeStr.split(/[:,]/))
                .map(Number)
                .zipWith([60 * 60 * 1000, 60 * 1000, 1000, 1], function(a, b){ return a * b; })
                .reduce(_.add, 0);
        };

        var stream = Bacon
            .fromPromise($.get(url))
            .map(function(srtPackets) {
                return _(srtPackets)
                    .split(/^\s+$/m)
                    .map(_.trim)
                    .compact()
                    .map(function (setPacket) {
                        return _.extend({
                            serial: +_(setPacket.match(/^\s*([0-9]+)/)).last(),
                            text: _(setPacket).split('\n').drop(2).join('\n')
                        }, _(setPacket.match(/([0-9]{2}:[0-9]{2}:[0-9]{2},[0-9]{3})\s-->\s([0-9]{2}:[0-9]{2}:[0-9]{2},[0-9]{3})/)).rest().map(parseTimeCode).zipObject(["in", "out"]).invert().value());
                    }).value();
            });

        stream.onValue(_.partial(cb, null));
        stream.onError(cb);
    
    };
});