/*
* 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;
  $.Watermark = function()
  {
  };

  $.extend($.Watermark,
  {
    defaults:
    {
      color: '#999',
      left: 0,
      top: 0,
      fallback: false,
      animDuration: 300,
      minOpacity: 0.6
    },

    setDefaults: function (settings)
    {
      $.extend($.Watermark.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 = $.extend($.Watermark.defaults, options);
    elems = this.filter('textarea, input:not(:checkbox,:radio,:file,:submit,:reset)');

    if (options.fallback && $.Watermark.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('Watermarked_element', $elem);

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

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

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

    return this;
  };

  $(document).ready(function ()
  {
    $('.Watermarked').Watermark();
  });
})(jQuery);