// tipsy, facebook style tooltips for jquery with fancy fading
// version 1.0.0a
// (c) 2008-2010 jason frame [jason@onehackoranother.com] and modificated by Sergio Alvarez @saleiva
// released under the MIT license
//
//  Changes:
//  April 27 2016: fixed problem with element size.
//  June 3 2013: Added the custom class before the calc of the position.

(function($) {

  var MOVE_OFFSET = 6;

  function maybeCall(thing, ctx, argument) {
    return (typeof thing == 'function') ? (thing.call(ctx, argument)) : thing;
  };

  function isElementInDOM(ele) {
    while (ele = ele.parentNode) {
      if (ele == document) return true;
    }
    return false;
  };

  function Tipsy(element, options) {
    this.$element = $(element);
    this.options = options;
    this.enabled = true;
    this.fixTitle();
  };

  Tipsy.prototype = {
    show: function() {
      var title = this.getTitle();
      if (title && this.enabled) {
        var $tip = this.tip();

        $tip.find('.tipsy-inner')[this.options.html ? 'html' : 'text'](title);
            $tip[0].className = 'tipsy'; // reset classname in case of dynamic gravity
            $tip.remove().css({top: 0, left: 0, visibility: 'hidden', display: 'block'}).prependTo(document.body);

            // Modified so we can use custom class names
            if (this.options.className) {
              $tip.addClass(maybeCall(this.options.className, this.$element[0]));
            }

            // Modified
            var pos = $.extend({}, this.$element.offset(), {
              width: this.$element[0].getBoundingClientRect().width,
              height: this.$element[0].getBoundingClientRect().height
            });

            var actualWidth = $tip[0].offsetWidth,
            actualHeight = $tip[0].offsetHeight,
            gravity = maybeCall(this.options.gravity, this.$element[0], $tip[0]);

            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};
              mo = {top: parseInt(pos.top + pos.height + this.options.offset + MOVE_OFFSET), opacity: this.options.opacity};
              break;
              case 's':
              tp = {top: pos.top - actualHeight - this.options.offset, left: pos.left + pos.width / 2 - actualWidth / 2};
              mo = {top: parseInt(pos.top - actualHeight - this.options.offset - MOVE_OFFSET), opacity: this.options.opacity};
              break;
              case 'e':
              tp = {top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left - actualWidth - this.options.offset};
              mo = {left: parseInt(pos.left - actualWidth - this.options.offset - MOVE_OFFSET), opacity: this.options.opacity};
              break;
              case 'w':
              tp = {top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left + pos.width + this.options.offset};
              mo = {left: parseInt(pos.left + pos.width + this.options.offset + MOVE_OFFSET), opacity: this.options.opacity};
              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);
            $tip.find('.tipsy-arrow')[0].className = 'tipsy-arrow tipsy-arrow-' + gravity.charAt(0);

            if (this.options.fade) {
              $tip.stop().css({opacity: 0, display: 'block', visibility: 'visible'}).animate(mo, 200);
            } else {
              $tip.css({visibility: 'visible', opacity: this.options.opacity});
            }
          }
        },

        hide: function() {

          gravity = maybeCall(this.options.gravity, this.$element[0]);

          switch (gravity.charAt(0)) {
            case 'n':
            mo = {top: parseInt(this.tip().css("top")) + MOVE_OFFSET, opacity: 0};
            break;
            case 's':
            mo = {top: parseInt(this.tip().css("top")) - MOVE_OFFSET, opacity: 0};
            break;
            case 'e':
            mo = {left: parseInt(this.tip().css("left")) - MOVE_OFFSET, opacity: 0};
            break;
            case 'w':
            mo = {left: parseInt(this.tip().css("left")) + MOVE_OFFSET, opacity: 0};
            break;
          }

          if (this.options.fade) {
            this.tip().stop().animate(mo, 200, 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).replace(/(^\s*|\s*$)/, "");
          return title || o.fallback;
        },

        tip: function() {
          if (!this.$tip) {
            this.$tip = $('<div class="tipsy"></div>').html('<div class="tipsy-arrow"></div><div class="tipsy-inner"></div>');
            this.$tip.data('tipsy-pointee', this.$element[0]);
          }
          return this.$tip;
        },

        validate: function() {
          if (!this.$element[0].parentNode) {
            this.hide();
            this.$element = null;
            this.options = null;
          }
        },

        remove: function() { this.enabled = false; this.$tip && this.$tip.remove(); },
        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 = {
        className: null,
        delayIn: 0,
        delayOut: 0,
        fade: false,
        fallback: '',
        gravity: 'n',
        html: false,
        live: false,
        offset: 0,
        opacity: 0.8,
        title: 'title',
        trigger: 'hover'
      };

      $.fn.tipsy.revalidate = function() {
        $('.tipsy').each(function() {
          var pointee = $.data(this, 'tipsy-pointee');
          if (!pointee || !isElementInDOM(pointee)) {
            $(this).remove();
          }
        });
      };

    // 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.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';
    };

    /**
     * yields a closure of the supplied parameters, producing a function that takes
     * no arguments and is suitable for use as an autogravity function like so:
     *
     * @param margin (int) - distance from the viewable region edge that an
     *        element should be before setting its tooltip's gravity to be away
     *        from that edge.
     * @param prefer (string, e.g. 'n', 'sw', 'w') - the direction to prefer
     *        if there are no viewable region edges effecting the tooltip's
     *        gravity. It will try to vary from this minimally, for example,
     *        if 'sw' is preferred and an element is near the right viewable
     *        region edge, but not the top edge, it will set the gravity for
     *        that element's tooltip to be 'se', preserving the southern
     *        component.
     */
     $.fn.tipsy.autoBounds = function(margin, prefer) {
      return function() {
       var dir = {ns: prefer[0], ew: (prefer.length > 1 ? prefer[1] : false)},
       boundTop = $(document).scrollTop() + margin,
       boundLeft = $(document).scrollLeft() + margin,
       $this = $(this);

       if ($this.offset().top < boundTop) dir.ns = 'n';
       if ($this.offset().left < boundLeft) dir.ew = 'w';
       if ($(window).width() + $(document).scrollLeft() - $this.offset().left < margin) dir.ew = 'e';
       if ($(window).height() + $(document).scrollTop() - $this.offset().top < margin) dir.ns = 's';

       return dir.ns + (dir.ew ? dir.ew : '');
     }
   };

 })(jQuery);