CaffGeek/MBACNationals

(function( exports, $ ){
    var api = wp.customize,
        debounce;

    debounce = function( fn, delay, context ) {
        var timeout;
        return function() {
            var args = arguments;

            context = context || this;

            clearTimeout( timeout );
            timeout = setTimeout( function() {
                timeout = null;
                fn.apply( context, args );
            }, delay );
        };
    };

    api.Preview = api.Messenger.extend({
        /**
         * Requires params:
         *  - url    - the URL of preview frame
         */
        initialize: function( params, options ) {
            var self = this;

            api.Messenger.prototype.initialize.call( this, params, options );

            this.body = $( document.body );
            this.body.on( 'click.preview', 'a', function( event ) {
                event.preventDefault();
                self.send( 'scroll', 0 );
                self.send( 'url', $(this).prop('href') );
            });

            // You cannot submit forms.
            // @todo: Allow form submissions by mixing $_POST data with the customize setting $_POST data.
            this.body.on( 'submit.preview', 'form', function( event ) {
                event.preventDefault();
            });

            this.window = $( window );
            this.window.on( 'scroll.preview', debounce( function() {
                self.send( 'scroll', self.window.scrollTop() );
            }, 200 ));

            this.bind( 'scroll', function( distance ) {
                self.window.scrollTop( distance );
            });
        }
    });

    $( function() {
        api.settings = window._wpCustomizeSettings;
        if ( ! api.settings )
            return;

        var preview, bg;

        preview = new api.Preview({
            url: window.location.href,
            channel: api.settings.channel
        });

        preview.bind( 'settings', function( values ) {
            $.each( values, function( id, value ) {
                if ( api.has( id ) )
                    api( id ).set( value );
                else
                    api.create( id, value );
            });
        });

        preview.trigger( 'settings', api.settings.values );

        preview.bind( 'setting', function( args ) {
            var value;

            args = args.slice();

            if ( value = api( args.shift() ) )
                value.set.apply( value, args );
        });

        preview.bind( 'sync', function( events ) {
            $.each( events, function( event, args ) {
                preview.trigger( event, args );
            });
            preview.send( 'synced' );
        });

        preview.bind( 'active', function() {
            if ( api.settings.nonce )
                preview.send( 'nonce', api.settings.nonce );
        });

        preview.send( 'ready' );

        /* Custom Backgrounds */
        bg = $.map(['color', 'image', 'position_x', 'repeat', 'attachment'], function( prop ) {
            return 'background_' + prop;
        });

        api.when.apply( api, bg ).done( function( color, image, position_x, repeat, attachment ) {
            var body = $(document.body),
                head = $('head'),
                style = $('#custom-background-css'),
                update;

            update = function() {
                var css = '';

                // The body will support custom backgrounds if either
                // the color or image are set.
                //
                // See get_body_class() in /wp-includes/post-template.php
                body.toggleClass( 'custom-background', !! ( color() || image() ) );

                if ( color() )
                    css += 'background-color: ' + color() + ';';

                if ( image() ) {
                    css += 'background-image: url("' + image() + '");';
                    css += 'background-position: top ' + position_x() + ';';
                    css += 'background-repeat: ' + repeat() + ';';
                    css += 'background-attachment: ' + attachment() + ';';
                }

                // Refresh the stylesheet by removing and recreating it.
                style.remove();
                style = $('<style type="text/css" id="custom-background-css">body.custom-background { ' + css + ' }</style>').appendTo( head );
            };

            $.each( arguments, function() {
                this.bind( update );
            });
        });
    });

})( wp, jQuery );