(function($) {
    $.fn.tipsy = function(options) {
    	
    	var $tips = $();

        options = $.extend({}, $.fn.tipsy.defaults, options);
        
        var showTipsy = function(title) {
        	
        	var tip = $.data(this, 'active.tipsy');
        	$tips.add(tip);
        	
        	var opts = $.data(this, 'options.tipsy');
        	var title;
        	
        	if(typeof opts._text == 'undefined') {
        		if ($(this).attr('title') || typeof($(this).attr('original-title')) != 'string') {
                    $(this).attr('original-title', $(this).attr('title') || '').removeAttr('title');
                }

                
                if (typeof opts.title == 'string') {
                    title = $(this).attr(opts.title == 'title' ? 'original-title' : opts.title);
                } else if (typeof opts.title == 'function') {
                    title = opts.title.call(this);
                }
                
                opts._text = title.replace(/^\s+/, '').replace(/\s+$/, '');
                $.data(this, 'options.tipsy', opts);
                
        	} 

        	title = opts._text;

        	if(! title || $(this).text().indexOf(title) >= 0) {
            	return;
            }
        	
            if (!tip) {
                tip = $('<div />').addClass('tipsy').append($('<div />').addClass('tipsy-inner'));
                tip.css({position: 'absolute', zIndex: 100000});
                $.data(this, 'active.tipsy', tip);
            }

            $.data(this, 'cancel.tipsy', true);

            tip.find('.tipsy-inner')[opts.html ? 'html' : 'text'](title || opts.fallback);

            var pos = $.extend({}, $(this).offset(), {width: this.offsetWidth, height: this.offsetHeight});
            tip.get(0).className = 'tipsy'; // reset classname in case of dynamic gravity
            tip.remove().css({top: 0, left: 0, visibility: 'hidden', display: 'block'}).appendTo(document.body);
            var actualWidth = tip[0].offsetWidth, actualHeight = tip[0].offsetHeight;
            var gravity = (typeof opts.gravity == 'function') ? opts.gravity.call(this) : opts.gravity;
            var classname = (typeof opts.classname == 'string') ? opts.classname : '';

            if(classname.length) {
            	tip.addClass(classname);
            }
            
            switch (gravity.charAt(0)) {
                case 'n':
                    tip.css({top: pos.top + pos.height, left: pos.left + pos.width / 2 - actualWidth / 2}).addClass('tipsy-north');
                    break;
                case 's':
                    tip.css({top: pos.top - actualHeight, left: pos.left + pos.width / 2 - actualWidth / 2}).addClass('tipsy-south');
                    break;
                case 'e':
                    tip.css({top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left - actualWidth}).addClass('tipsy-east');
                    break;
                case 'w':
                    tip.css({top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left + pos.width}).addClass('tipsy-west');
                    break;
            }

            $tips.hide();
            
            if (opts.fade) {
                tip.css({opacity: 0, display: 'block', visibility: 'visible'}).animate({opacity: 0.8});
            } else {
                tip.css({visibility: 'visible'});
            }
            
            $(this).addClass('tipped');

        };
        
        var hideTipsy = function() {
            
        	$.data(this, 'cancel.tipsy', false);
        	var opts = $.data(this, 'options.tipsy');
        	
            var self = this;
            setTimeout(function() {
                if ($.data(this, 'cancel.tipsy')) return;
                var tip = $.data(self, 'active.tipsy');
                
                if(! tip) {
                	return;
                }
                
                if (opts.fade) {
                    tip.stop().fadeOut(function() { $(this).remove(); $(self).removeClass('tipped');});
                } else {
                    tip.remove();
                    $(self).removeClass('tipped');
                }
                
                
            }, 100);

        };
        
        return this.each(function() {
            
        	var self = this;
        	
            var opts = $.fn.tipsy.elementOptions(this, options);
            
            $.data(this, 'options.tipsy', opts);
            
            var timer = false;
            
            $(this).hover( function() {
            	
            	timer = setTimeout(function(){
            		showTipsy.apply(self);
            	}, opts.timeout);
            	
            }, function () {
            	
            	if( timer ) {
            		clearTimeout(timer);
            	}
            	
            	hideTipsy.apply(self);
            });
            
            
        });
        
    };
    
    // Overwrite this method to provide options on a per-element basis.
    // For example, you could store the gravity in a 'tipsy-gravity' attribute:
    // return $.extend({}, options, {gravity: $(ele).attr('tipsy-gravity') || 'n' });
    // (remember - do not modify 'options' in place!)
    $.fn.tipsy.elementOptions = function(ele, options) {
        return $.metadata ? $.extend({}, options, $(ele).metadata()) : options;
    };
    
    $.fn.tipsy.defaults = {
        fade: false,
        fallback: '',
        timeout: 100,
        gravity: 'n',
        html: false,
        title: 'title'
    };
    
    $.fn.tipsy.autoNS = function() {
        return $(this).offset().top > ($(document).scrollTop() + $(window).height() / 2) ? 's' : 'n';
    };
    
    $.fn.tipsy.autoWE = function() {
        return $(this).offset().left > ($(document).scrollLeft() + $(window).width() / 2) ? 'e' : 'w';
    };
    
})(jQuery);