/*global jQuery*/
/*jshint curly:false*/

;(function ( $, window) {
    "use strict";

    var defaults = {
        pulses   : 1,
        interval : 0,
        returnDelay : 0,
        duration : 500
    };

    $.fn.pulse = function(properties, options, callback) {
        // $(...).pulse('destroy');
        var stop = properties === 'destroy';

        if (typeof options === 'function') {
            callback = options;
            options = {};
        }

        options = $.extend({}, defaults, options);

        if (!(options.interval >= 0))    options.interval = 0;
        if (!(options.returnDelay >= 0)) options.returnDelay = 0;
        if (!(options.duration >= 0))    options.duration = 500;
        if (!(options.pulses >= -1))     options.pulses = 1;
        if (typeof callback !== 'function') callback = function(){};

        return this.each(function () {
            var el = $(this),
                property,
                original = {};

            var data = el.data('pulse') || {};
            data.stop = stop;
            el.data('pulse', data);

            for (property in properties) {
                if (properties.hasOwnProperty(property)) original[property] = el.css(property);
            }

            var timesPulsed = 0;

            var fromOptions = $.extend({}, options);
            fromOptions.duration = options.duration / 2;
            fromOptions.complete = function() {
                window.setTimeout(animate, options.interval);
            };

            var toOptions = $.extend({}, options);
            toOptions.duration = options.duration / 2;
            toOptions.complete = function(){
                window.setTimeout(function(){
                    el.animate(original, fromOptions);
                },options.returnDelay);
            };

            function animate() {
                if (typeof el.data('pulse') === 'undefined') return;
                if (el.data('pulse').stop) return;
                if (options.pulses > -1 && ++timesPulsed > options.pulses) return callback.apply(el);
                el.animate(
                    properties,
                    toOptions
                );
            }

            animate();
        });
    };

})( jQuery, window, document );