// tipsy, facebook style tooltips for jquery
// version 1.0.0a
// (c) 2008-2010 jason frame [jason@onehackoranother.com]
// releated under the MIT license

(function($) {

  function fixTitle($ele) {
    if ($ele.attr('title') || typeof($ele.attr('original-title')) != 'string') {
      $ele.attr('original-title', $ele.attr('title') || '').removeAttr('title');
    }
  }

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

  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'
        }).appendTo(document.body);

        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
          });
        }
        // adding the 'click to hide' function
        var that = this;
        $tip.click(function(){
          that.hide();
        });
      }
    },

    hide: function() {
      if (this.options.fade) {
        this.tip().stop().fadeOut(function() {
          $(this).remove();
        });
      } else {
        this.tip().remove();
      }
    },

    getTitle: function() {
      var title, $e = this.$element, o = this.options;
      fixTitle($e);
      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 = $('<div class="tipsy"></div>').html('<div class="tipsy-arrow"></div><div class="tipsy-inner"/></div>');
      }
      return this.$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') {
      return this.data('tipsy')[options]();
    }

    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 {
        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.auto = function () {
    var ns= $(this).offset().top > ($(document).scrollTop() + $(window).height() / 2) ? 's' : 'n';
    var ew=$(this).offset().left > ($(document).scrollLeft() + $(window).width() / 2) ? 'e' : 'w';
    return ns+ew;
  }

  $.fn.tipsy.defaults = {
    delayIn: 0,
    delayOut: 0,
    fade: false,
    fallback: '',
    gravity: $.fn.tipsy.auto,
    html: true,
    live: false,
    offset: 0,
    opacity: 1.0,
    title: 'title',
    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 $.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);