// Copyright 2009 Josh Close
// This file is a part of jquery.watermark and is licensed under the MS-PL
// See LICENSE.txt for details or visit http://www.opensource.org/licenses/ms-pl.html
/// <reference path="jquery-1.3.2.js" />

(function($) {
    var defaultOptions = {
        cssClass: "",
        onBeforeSetWatermark: null,
        onAfterSetWatermark: null,
        onBeforeRemoveWatermark: null,
        onAfterRemoveWatermark: null
    };

    jQuery.fn.watermark = function(watermarkText, options) {
        $(this).each(function() {
            if (this.type == "text" || this.type == "textarea") {
                initialize.call(this);
            }
        });

        function initialize() {
            setOptions.call(this);
            setEvents.call(this);
            var text = $.trim($(this).val());
            if (text.length == 0 || text == watermarkText) {
                setWatermark.call(this);
            }
        }

        function elementFocus(event) {
            var text = $.trim($(this).val());
            if (text.length == 0 || text == watermarkText) {
                removeWatermark.call(this);
            }
        }

        function elementBlur(event) {
            var text = $.trim($(this).val());
            if (text.length == 0 || text == watermarkText) {
                setWatermark.call(this);
            }
        }

        function setWatermark() {
            callEvent.call(this, options.onBeforeSetWatermark);

            $(this).addClass(options.cssClass).val(watermarkText);

            callEvent.call(this, options.onAfterSetWatermark);
        }

        function removeWatermark() {
            callEvent.call(this, options.onBeforeRemoveWatermark);

            $(this).removeClass(options.cssClass).val("");

            callEvent.call(this, options.onAfterRemoveWatermark);
        }

        function callEvent(event) {
            if (typeof (event) == "function") {
                event.call(this);
            }
        }

        function setEvents() {
            var el = $(this);
            el.focus(elementFocus);
            el.blur(elementBlur);
        }

        function setOptions() {
            el = $(this);
            options = $.extend({}, defaultOptions, el.data("watermark:options"), options);
            el.data("watermark:options", options);
        }

        return this;
    };
})(jQuery);