/**
 *  Hovertip - easy and elegant tooltips
 *  
 *  By Dave Cohen <http://dave-cohen.com>
 *  With ideas and and javascript code borrowed from many folks.
 *  (See URLS in the comments)
 *  
 *  Licensed under GPL. 
 *  Requires jQuery.js.  <http://jquery.com>, 
 *  which may be distributed under a different licence.  
 */


// use globals to track mouse position
var hovertipMouseX;
var hovertipMouseY;
function hovertipMouseUpdate(e) {
  var mouse = hovertipMouseXY(e);
  hovertipMouseX = mouse[0];
  hovertipMouseY = mouse[1];
}

// http://www.howtocreate.co.uk/tutorials/javascript/eventinfo
function hovertipMouseXY(e) {
  if( !e ) {
    if( window.event ) {
      //Internet Explorer
      e = window.event;
    } else {
      //total failure, we have no way of referencing the event
      return;
    }
  }
  if( typeof( e.pageX ) == 'number' ) {
    //most browsers
    var xcoord = e.pageX;
    var ycoord = e.pageY;
  } else if( typeof( e.clientX ) == 'number' ) {
    //Internet Explorer and older browsers
    //other browsers provide this, but follow the pageX/Y branch
    var xcoord = e.clientX;
    var ycoord = e.clientY;
    var badOldBrowser = ( window.navigator.userAgent.indexOf( 'Opera' ) + 1 ) ||
      ( window.ScriptEngine && ScriptEngine().indexOf( 'InScript' ) + 1 ) ||
      ( navigator.vendor == 'KDE' );
    if( !badOldBrowser ) {
      if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) ) {
        //IE 4, 5 & 6 (in non-standards compliant mode)
        xcoord += document.body.scrollLeft;
        ycoord += document.body.scrollTop;
      } else if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) ) {
        //IE 6 (in standards compliant mode)
        xcoord += document.documentElement.scrollLeft;
        ycoord += document.documentElement.scrollTop;
      }
    }
  } else {
        return;
  }
  return [xcoord, ycoord];
}

targetSelectById = function(el, config) {
  var id;
  var selector;
  if (id = el.getAttribute('id')) {
    selector = '*['+config.attribute+'=\''+id+'\']';
    return $(selector);
  }
};

targetSelectByTargetAttribute = function(el, config) {
  target_list = el.getAttribute('target');
  if (target_list) {
    target_ids = target_list.split(' ');
    var selector = '#' + target_ids.join(',#');
    return $(selector);
  }
};

targetSelectByPrevious = function(el, config) {
  return $(el.previousSibling);
}


targetSelectBySiblings = function(el, config) {
  return $(el).siblings();
}


hovertipPrepare = function(o, config) {
  return o.hover(function() {
      hovertipHideCancel(this);
    }, function() {
      hovertipHideLater(this);
    }).css('position', 'absolute').each(hovertipPosition);
};

hovertipPrepareNoOp = function(o, config) {
  return o;
}

hovertipPosition = function(i) {
  document.body.appendChild(this);
}

hovertipIsVisible = function(el) {
  return (jQuery.css(el, 'display') != 'none');
}

hovertipShowUnderMouse = function(el) {
  hovertipHideCancel(el);
  if (!hovertipIsVisible(el)) {
    el.ht.showing = 
      window.setTimeout(function() {
          el.ht.tip.css({
              'position':'absolute',
                'top': hovertipMouseY + 'px',
                'left': hovertipMouseX + 'px'})
            .show();
        }, el.ht.config.showDelay);
  }
};


hovertipHideCancel = function(el) {
  if (el.ht.hiding) {
    window.clearTimeout(el.ht.hiding);
    el.ht.hiding = null;
  }  
};

hovertipHideLater = function(el) {
  if (el.ht.showing) {
    window.clearTimeout(el.ht.showing);
    el.ht.showing = null;
  }
  if (el.ht.hiding) {
    window.clearTimeout(el.ht.hiding);
    el.ht.hiding = null;
  }
  el.ht.hiding = 
  window.setTimeout(function() {
      if (el.ht.hiding) {
      
        el.ht.tip.hide();
      }
    }, el.ht.config.hideDelay);
};


hovertipTargetPrepare = function(o, el, config) {
  return o.addClass(config.attribute + '_target')
  .hover(function() {
      
      hovertipShowUnderMouse(el);
    },
    function() {
      
      hovertipHideLater(el);
    });
};


jQuery.fn.hovertipActivate = function(config, targetSelect, tipPrepare, targetPrepare) {
    return this.css('display', 'block')
  .hide() 
  .each(function() {
      if (!this.ht)
        this.ht = new Object();
      this.ht.config = config;
      
      var targets = targetSelect(this, config);
      if (targets && targets.size()) {
        if (!this.ht.targets)
          this.ht.targets = targetPrepare(targets, this, config);
        else
          this.ht.targets.add(targetPrepare(targets, this, config));
        
        targets.mousemove(hovertipMouseUpdate);
        
               if (!this.ht.tip)
          this.ht.tip = tipPrepare($(this), config);
      }
      
    })
  ;
};


function hovertipInit() {
   
  
  var hovertipConfig = {'attribute':'hovertip',
                        'showDelay': 100,
                        'hideDelay': 100};
  
   var hovertipSelect = 'div.hovertip';
  
 
  $(hovertipSelect).css('display', 'block').addClass('hovertip_wrap3').
    wrap("<div class='hovertip_wrap0'><div class='hovertip_wrap1'><div class='hovertip_wrap2'>" + 
         "</div></div></div>").each(function() {
           // fix class and attributes for newly wrapped elements
           var tooltip = this.parentNode.parentNode.parentNode;
           if (this.getAttribute('target'))
             tooltip.setAttribute('target', this.getAttribute('target'));
           if (this.getAttribute('id')) {
             var id = this.getAttribute('id');
             this.removeAttribute('id');
             tooltip.setAttribute('id', id);
           }
         });
  hovertipSelect = 'div.hovertip_wrap0';
  
   window.setTimeout(function() {
    $(hovertipSelect).hovertipActivate(hovertipConfig,
                                       targetSelectById,
                                       hovertipPrepare,
                                       hovertipTargetPrepare);
  }, 0);

 }