/**
 * jQuery.ScrollTo
 * Copyright (c) 2008 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com
 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
 * Date: 2/19/2008
 *
 * @projectDescription Easy element scrolling using jQuery.
 * Tested with jQuery 1.2.1. On FF 2.0.0.11, IE 6, Opera 9.22 and Safari 3 beta. on Windows.
 *
 * @author Ariel Flesler
 * @version 1.3.3
 *
 * @id jQuery.scrollTo
 * @id jQuery.fn.scrollTo
 * @param {String, Number, DOMElement, jQuery, Object} target Where to scroll the matched elements.
 *    The different options for target are:
 *    - A number position (will be applied to all axes).
 *    - A string position ('44', '100px', '+=90', etc ) will be applied to all axes
 *    - A jQuery/DOM element ( logically, child of the element to scroll )
 *    - A string selector, that will be relative to the element to scroll ( 'li:eq(2)', etc )
 *    - A hash { top:x, left:y }, x and y can be any kind of number/string like above.
 * @param {Number} duration The OVERALL length of the animation, this argument can be the settings object instead.
 * @param {Object} settings Hash of settings, optional.
 *   @option {String} axis Which axis must be scrolled, use 'x', 'y', 'xy' or 'yx'.
 *   @option {Number} duration The OVERALL length of the animation.
 *   @option {String} easing The easing method for the animation.
 *   @option {Boolean} margin If true, the margin of the target element will be deducted from the final position.
 *   @option {Object, Number} offset Add/deduct from the end position. One number for both axes or { top:x, left:y }.
 *   @option {Object, Number} over Add/deduct the height/width multiplied by 'over', can be { top:x, left:y } when using both axes.
 *   @option {Boolean} queue If true, and both axis are given, the 2nd axis will only be animated after the first one ends.
 *   @option {Function} onAfter Function to be called after the scrolling ends. 
 *   @option {Function} onAfterFirst If queuing is activated, this function will be called after the first scrolling ends.
 * @return {jQuery} Returns the same jQuery object, for chaining.
 *
 * @example $('div').scrollTo( 340 );
 *
 * @example $('div').scrollTo( '+=340px', { axis:'y' } );
 *
 * @example $('div').scrollTo( 'p.paragraph:eq(2)', 500, { easing:'swing', queue:true, axis:'xy' } );
 *
 * @example var second_child = document.getElementById('container').firstChild.nextSibling;
 *      $('#container').scrollTo( second_child, { duration:500, axis:'x', onAfter:function(){
 *        alert('scrolled!!');                                   
 *      }});
 *
 * @example $('div').scrollTo( { top: 300, left:'+=200' }, { offset:-20 } );
 *
 * Notes:
 *  - jQuery.scrollTo will make the whole window scroll, it accepts the same arguments as jQuery.fn.scrollTo.
 *  - If you are interested in animated anchor navigation, check http://jquery.com/plugins/project/LocalScroll.
 *  - The options margin, offset and over are ignored, if the target is not a jQuery object or a DOM element.
 *  - The option 'queue' won't be taken into account, if only 1 axis is given.
 */
;(function( $ ){

  var $scrollTo = $.scrollTo = function( target, duration, settings ){
    $scrollTo.window().scrollTo( target, duration, settings );
  };

  $scrollTo.defaults = {
    axis:'y',
    duration:1
  };

  //returns the element that needs to be animated to scroll the window
  $scrollTo.window = function(){
    return $( $.browser.safari ? 'body' : 'html' );
  };

  $.fn.scrollTo = function( target, duration, settings ){
    if( typeof duration == 'object' ){
      settings = duration;
      duration = 0;
    }
    settings = $.extend( {}, $scrollTo.defaults, settings );
    duration = duration || settings.speed || settings.duration;//speed is still recognized for backwards compatibility
    settings.queue = settings.queue && settings.axis.length > 1;//make sure the settings are given right
    if( settings.queue )
      duration /= 2;//let's keep the overall speed, the same.
    settings.offset = both( settings.offset );
    settings.over = both( settings.over );

    return this.each(function(){
      var elem = this, $elem = $(elem),
        t = target, toff, attr = {},
        win = $elem.is('html,body');
      switch( typeof t ){
        case 'number'://will pass the regex
        case 'string':
          if( /^([+-]=)?\d+(px)?$/.test(t) ){
            t = both( t );
            break;//we are done
          }
          t = $(t,this);// relative selector, no break!
        case 'object':
          if( t.is || t.style )//DOM/jQuery
            toff = (t = $(t)).offset();//get the real position of the target 
      }
      $.each( settings.axis.split(''), function( i, axis ){
        var Pos  = axis == 'x' ? 'Left' : 'Top',
          pos = Pos.toLowerCase(),
          key = 'scroll' + Pos,
          act = elem[key],
          Dim = axis == 'x' ? 'Width' : 'Height',
          dim = Dim.toLowerCase();

        if( toff ){//jQuery/DOM
          attr[key] = toff[pos] + ( win ? 0 : act - $elem.offset()[pos] );

          if( settings.margin ){//if it's a dom element, reduce the margin
            attr[key] -= parseInt(t.css('margin'+Pos)) || 0;
            attr[key] -= parseInt(t.css('border'+Pos+'Width')) || 0;
          }
          
          attr[key] += settings.offset[pos] || 0;//add/deduct the offset
          
          if( settings.over[pos] )//scroll to a fraction of its width/height
            attr[key] += t[dim]() * settings.over[pos];
        }else
          attr[key] = t[pos];//remove the unnecesary 'px'

        if( /^\d+$/.test(attr[key]) )//number or 'number'
          attr[key] = attr[key] <= 0 ? 0 : Math.min( attr[key], max(Dim) );//check the limits

        if( !i && settings.queue ){//queueing each axis is required          
          if( act != attr[key] )//don't waste time animating, if there's no need.
            animate( settings.onAfterFirst );//intermediate animation
          delete attr[key];//don't animate this axis again in the next iteration.
        }
      });      
      animate( settings.onAfter );      

      function animate( callback ){
        $elem.animate( attr, duration, settings.easing, callback && function(){
          callback.call(this, target);
        });
      };
      function max( Dim ){
        var el = win ? $.browser.opera ? document.body : document.documentElement : elem;
        return el['scroll'+Dim] - el['client'+Dim];
      };
    });
  };

  function both( val ){
    return typeof val == 'object' ? val : { top:val, left:val };
  };

})( jQuery );