/**
*
* Copyright (c) 2007 Tom Deater (http://www.tomdeater.com)
* Licensed under the MIT License:
* http://www.opensource.org/licenses/mit-license.php
* 
*/

(function($) {
    /**
    * attaches a character counter to each textarea element in the jQuery object
    * usage: $("#myTextArea").charCounter(max, settings);
    */

    $.fn.charCounter = function(max, settings) {
        max = max || 100;
        settings = $.extend({
            container: "<span></span>",
            classname: "charcounter",
            format: "(%1 characters remaining)",
            pulse: true,
            delay: 0
        }, settings);
        var p, timeout;

        function count(el, container) {
            el = $(el);
            if (el.val().length > max) {
                el.val(el.val().substring(0, max));
                if (settings.pulse && !p) {
                    pulse(container, true);
                };
            };
            if (settings.delay > 0) {
                if (timeout) {
                    window.clearTimeout(timeout);
                }
                timeout = window.setTimeout(function() {
                    container.html(settings.format.replace(/%1/, (max - el.val().length)));
                }, settings.delay);
            } else {
                container.html(settings.format.replace(/%1/, (max - el.val().length)));
            }
        };

        function pulse(el, again) {
            if (p) {
                window.clearTimeout(p);
                p = null;
            };
            el.animate({ opacity: 0.1 }, 100, function() {
                $(this).animate({ opacity: 1.0 }, 100);
            });
            if (again) {
                p = window.setTimeout(function() { pulse(el) }, 200);
            };
        };

        return this.each(function() {
            var container = (!settings.container.match(/^<.+>$/))
				? $(settings.container)
				: $(settings.container)
					.insertAfter(this)
					.addClass(settings.classname);
            $(this)
				.bind("keydown", function() { count(this, container); })
				.bind("keypress", function() { count(this, container); })
				.bind("keyup", function() { count(this, container); })
				.bind("focus", function() { count(this, container); })
				.bind("mouseover", function() { count(this, container); })
				.bind("mouseout", function() { count(this, container); })
				.bind("paste", function() {
				    var me = this;
				    setTimeout(function() { count(me, container); }, 10);
				});
            if (this.addEventListener) {
                this.addEventListener('input', function() { count(this, container); }, false);
            };
            count(this, container);
        });
    };

})(jQuery);