/*
* jQuery Watermark plugin
* Version 1.2 (7-DEC-2010)
* @requires jQuery v1.3 or later
*
* Examples at: http://mario.ec/static/jq-watermark/
* Copyright (c) 2010 Mario Estrada
* Licensed under the MIT license:
* http://www.opensource.org/licenses/mit-license.php
*
*/

(function ($) {
	var old_ie = $.browser.msie && $.browser.version < 8;
	var hard_left = 4;
	$.watermarker = function () { };
	$.extend($.watermarker, {
		defaults: {
			color: '#999',
			left: 0,
			top: 0,
			fallback: false,
			animDuration: 300,
			minOpacity: 0.6
		},
		setDefaults: function (settings) {
			$.extend($.watermarker.defaults, settings);
		},
		checkVal: function (val, label, event_blur) {
			if (val.length == 0)
				$(label).show();
			else
				$(label).hide();

			return val.length > 0;
		},
		html5_support: function () {
			var i = document.createElement('input');
			return 'placeholder' in i;
		}
	});

	$.fn.watermark = function (text, options) {
		var options, elems;
		options = $.extend($.watermarker.defaults, options);
		elems = this.filter('textarea, input:not(:checkbox,:radio,:file,:submit,:reset)');

		if (options.fallback && $.watermarker.html5_support())
			return;

		elems.each(function () {
			var $elem, attr_name, label_text, watermark_container, watermark_label;
			var e_margin_left, e_margin_top, pos, e_top = 0, height, line_height;

			$elem = $(this);
			if ($elem.attr('data-jq-watermark') == 'processed')
				return;

			attr_name = $elem.attr('placeholder') != undefined && $elem.attr('placeholder') != '' ? 'placeholder' : 'title';
			label_text = text === undefined || text === '' ? $(this).attr(attr_name) : text;
			watermark_container = $('<span class="watermark_container"></span>');
			watermark_label = $('<span class="watermark">' + label_text + '</span>');

			// If used, remove the placeholder attribute to prevent conflicts
			if (attr_name == 'placeholder')
				$elem.removeAttr('placeholder');

			watermark_container.css({
				display: 'inline-block',
				position: 'relative'
			});

			if (old_ie) {
				watermark_container.css({
					zoom: 1,
					display: 'inline'
				});
			}

			$elem.wrap(watermark_container).attr('data-jq-watermark', 'processed');
			if (this.nodeName.toLowerCase() == 'textarea') {
				e_height = $elem.css('line-height');
				e_height = e_height === 'normal' ? parseInt($elem.css('font-size')) : e_height;
				e_top = ($elem.css('padding-top') != 'auto' ? parseInt($elem.css('padding-top')) : 0);
			} else {
				e_height = $elem.outerHeight();
				if (e_height <= 0) {
					e_height = ($elem.css('padding-top') != 'auto' ? parseInt($elem.css('padding-top')) : 0);
					e_height += ($elem.css('padding-bottom') != 'auto' ? parseInt($elem.css('padding-bottom')) : 0);
					e_height += ($elem.css('height') != 'auto' ? parseInt($elem.css('height')) : 0);
				}
			}

			e_top += ($elem.css('margin-top') != 'auto' ? parseInt($elem.css('margin-top')) : 0);

			e_margin_left = $elem.css('margin-left') != 'auto' ? parseInt($elem.css('margin-left')) : 0;
			e_margin_left += $elem.css('padding-left') != 'auto' ? parseInt($elem.css('padding-left')) : 0;

			watermark_label.css({
				position: 'absolute',
				display: 'block',
				fontFamily: $elem.css('font-family'),
				fontSize: $elem.css('font-size'),
				color: options.color,
				left: hard_left + options.left + e_margin_left,
				top: options.top + e_top,
				height: e_height,
				lineHeight: e_height + 'px',
				textAlign: 'left',
				pointerEvents: 'none'
			}).data('jq_watermark_element', $elem);

			$.watermarker.checkVal($elem.val(), watermark_label);

			watermark_label.click(function () {
				$($(this).data('jq_watermark_element')).trigger('focus');
			});

			$elem.before(watermark_label)
                        .bind('focus.jq_watermark', function () {
                        	if (!$.watermarker.checkVal($(this).val(), watermark_label))
                        		watermark_label.stop().fadeTo(options.animDuration, options.minOpacity);
                        })
                        .bind('blur.jq_watermark change.jq_watermark', function () {
                        	if (!$.watermarker.checkVal($(this).val(), watermark_label))
                        		watermark_label.stop().fadeTo(options.animDuration, 1);
                        })
                        .bind('keydown.jq_watermark', function (e) {
                        	$(watermark_label).hide();
                        })
                        .bind('keyup.jq_watermark', function (e) {
                        	$.watermarker.checkVal($(this).val(), watermark_label);
                        });
		});

		return this;
	};

	$(document).ready(function () {
		$('.jq_watermark').watermark();
	});
})(jQuery);