// tipsy, facebook style tooltips for jquery
// version 1.0.0a
// (c) 2008-2010 jason frame [jason@onehackoranother.com]
// released under the MIT license
// modified by yc: ajax load support
// eg:
//	$('.jtip').tipsy();
//	<a href="/url/1/" class="jtip">test</a>					=>	ajax loading
//	<a href="#more" class="jtip" tip="test">h</a>			=>	non-ajax loading
//	<span class="jtip" tip="1" tipsy-gravity="s">t</span>	=>	directions
//	<img class="jtip" tip="1 tipsy-width="300" src="" />	=>	width

(function($) {
    
    function Tipsy(element, options) {
        this.$element = $(element);
        this.options = options;
        this.enabled = true;
        this.fixTitle();
    }
    
    Tipsy.prototype = {
        show: function() {
            var title = this.getTitle(), $e = this.$element;
			var is_ajax = !title && ($e[0].tagName == 'A') && ($e.attr('href').indexOf('#') != 0) && !$e.attr('tip');
            if (this.enabled) {
				var $tip = this.tip();
				if (this.options.width)
					$tip.find('.tipsy-inner').css('maxWidth', this.options.width);
				$tip[0].className = 'tipsy'; // reset classname in case of dynamic gravity
				$tip.remove().css({top: 0, left: 0, visibility: 'hidden', display: 'block'}).appendTo(document.body);
				if (is_ajax){
					this._show('<p class="center"><img src="' + this.options.indicator + '" /></p>');
					if (this.options.useCache && $e.data('tip-cache'))
						this._show($e.data('tip-cache'));
					else {
						var that = this, url = $e.attr('href'), rand = +new Date();
						url += (url.indexOf('?') != -1 ? '&_rand_=' : '?_rand_=') + rand;
						$.get(url, function(data){
							if (that.hoverState == 'in')
								that._show(data);
							$e.data('tip-cache', data);
						});
					}
				} else
					this._show(title);
            }
        },

		_show: function(title){
			var $tip = this.tip(), render_func = this.options.html ? 'html' : 'text';
			$tip.find('.tipsy-inner')[render_func](title);
			var pos = $.extend({}, this.$element.offset(), {
				width: this.$element[0].offsetWidth,
				height: this.$element[0].offsetHeight
			});
			
			var actualWidth = $tip[0].offsetWidth, actualHeight = $tip[0].offsetHeight;
			var gravity = (typeof this.options.gravity == 'function')
							? this.options.gravity.call(this.$element[0])
							: this.options.gravity;
			
			var tp;
			switch (gravity.charAt(0)) {
				case 'n':
					tp = {top: pos.top + pos.height + this.options.offset, left: pos.left + pos.width / 2 - actualWidth / 2};
					break;
				case 's':
					tp = {top: pos.top - actualHeight - this.options.offset, left: pos.left + pos.width / 2 - actualWidth / 2};
					break;
				case 'e':
					tp = {top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left - actualWidth - this.options.offset};
					break;
				case 'w':
					tp = {top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left + pos.width + this.options.offset};
					break;
			}
			
			if (gravity.length == 2) {
				if (gravity.charAt(1) == 'w') {
					tp.left = pos.left + pos.width / 2 - 15;
				} else {
					tp.left = pos.left + pos.width / 2 - actualWidth + 15;
				}
			}
			
			$tip.css(tp).addClass('tipsy-' + gravity);
			
			if (this.options.fade) {
				$tip.stop().css({opacity: 0, display: 'block', visibility: 'visible'}).animate({opacity: this.options.opacity});
			} else {
				$tip.css({visibility: 'visible', opacity: this.options.opacity});
			}
		},
        
        hide: function() {
            if (this.options.fade) {
                this.tip().stop().fadeOut(function() { $(this).remove(); });
            } else {
                this.tip().remove();
            }
        },
        
        fixTitle: function() {
            var $e = this.$element;
            if ($e.attr('title') || typeof($e.attr('original-title')) != 'string') {
                $e.attr('original-title', $e.attr('title') || '').removeAttr('title');
            }
        },
        
        getTitle: function() {
            var title, $e = this.$element, o = this.options;
            this.fixTitle();
            var title, o = this.options;
            if (typeof o.title == 'string') {
                title = $e.attr(o.title == 'title' ? 'original-title' : o.title);
            } else if (typeof o.title == 'function') {
                title = o.title.call($e[0]);
            }
			title = title || '';
            title = ('' + title).replace(/(^\s*|\s*$)/, "");
            return title || o.fallback;
        },
        
        tip: function() {
            if (!this.$tip) {
                this.$tip = $('<div class="tipsy"></div>').html('<div class="tipsy-arrow"></div><div class="tipsy-inner"></div>');
            }
            return this.$tip;
        },
        
        validate: function() {
            if (!this.$element[0].parentNode) {
                this.hide();
                this.$element = null;
                this.options = null;
            }
        },
        
        enable: function() { this.enabled = true; },
        disable: function() { this.enabled = false; },
        toggleEnabled: function() { this.enabled = !this.enabled; }
    };
    
    $.fn.tipsy = function(options) {
        
        if (options === true) {
            return this.data('tipsy');
        } else if (typeof options == 'string') {
            var tipsy = this.data('tipsy');
            if (tipsy) tipsy[options]();
            return this;
        }
        
        options = $.extend({}, $.fn.tipsy.defaults, options);
        
        function get(ele) {
            var tipsy = $.data(ele, 'tipsy');
            if (!tipsy) {
                tipsy = new Tipsy(ele, $.fn.tipsy.elementOptions(ele, options));
                $.data(ele, 'tipsy', tipsy);
            }
            return tipsy;
        }
        
        function enter() {
            var tipsy = get(this);
            tipsy.hoverState = 'in';
            if (options.delayIn == 0) {
                tipsy.show();
            } else {
                tipsy.fixTitle();
                setTimeout(function() { if (tipsy.hoverState == 'in') tipsy.show(); }, options.delayIn);
            }
        };
        
        function leave() {
            var tipsy = get(this);
            tipsy.hoverState = 'out';
            if (options.delayOut == 0) {
                tipsy.hide();
            } else {
                setTimeout(function() { if (tipsy.hoverState == 'out') tipsy.hide(); }, options.delayOut);
            }
        };
        
        if (!options.live) this.each(function() { get(this); });
        
        if (options.trigger != 'manual') {
            var binder   = options.live ? 'live' : 'bind',
                eventIn  = options.trigger == 'hover' ? 'mouseenter' : 'focus',
                eventOut = options.trigger == 'hover' ? 'mouseleave' : 'blur';
            this[binder](eventIn, enter)[binder](eventOut, leave);
        }
        
        return this;
        
    };
    
    $.fn.tipsy.defaults = {
        delayIn: 0,
        delayOut: 0,
        fade: false,
        fallback: '',
        gravity: 'n',
        html: false,
        live: false,
        offset: 0,
        opacity: 0.8,
        title: 'title',
        useCache: false,
		indicator: '/static/images/jtip/loader.gif',
        trigger: 'hover'
    };
    
    // 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 $.extend({}, options, {gravity: $(ele).attr('tipsy-gravity') || options.gravity, width: $(ele).attr('tipsy-width')});
       // return $.metadata ? $.extend({}, options, $(ele).metadata()) : options;
    };
    
    $.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);