/*
   Kwicks for jQuery (version 1.5.1)
   Copyright (c) 2008 Jeremy Martin
   http://www.jeremymartin.name/projects.php?project=kwicks
   
   Licensed under the MIT license:
      http://www.opensource.org/licenses/mit-license.php

   Any and all use of this script must be accompanied by this copyright/license notice in its present form.
*/

(function($){
   $.fn.kwicks = function(options) {
      var defaults = {
         isVertical: false,
         sticky: false,
         defaultKwick: 0,
         event: 'mouseover',
         spacing: 0,
         duration: 500
      };
      var o = $.extend(defaults, options);
      var WoH = (o.isVertical ? 'height' : 'width'); // WoH = Width or Height
      var LoT = (o.isVertical ? 'top' : 'left'); // LoT = Left or Top
      
      return this.each(function() {
         container = $(this);
         var kwicks = container.children('li');
         var normWoH = kwicks.eq(0).css(WoH).replace(/px/,''); // normWoH = Normal Width or Height
         if(!o.max) {
            o.max = (normWoH * kwicks.size()) - (o.min * (kwicks.size() - 1));
         } else {
            o.min = ((normWoH * kwicks.size()) - o.max) / (kwicks.size() - 1);
         }
         // set width of container ul
         if(o.isVertical) {
            container.css({
               width : kwicks.eq(0).css('width'),
               height : (normWoH * kwicks.size()) + (o.spacing * (kwicks.size() - 1)) + 'px'
            });            
         } else {
            container.css({
               width : (normWoH * kwicks.size()) + (o.spacing * (kwicks.size() - 1)) + 'px',
               height : kwicks.eq(0).css('height')
            });            
         }

         // pre calculate left or top values for all kwicks but the first and last
         // i = index of currently hovered kwick, j = index of kwick we're calculating
         var preCalcLoTs = []; // preCalcLoTs = pre-calculated Left or Top's
         for(i = 0; i < kwicks.size(); i++) {
            preCalcLoTs[i] = [];
            // don't need to calculate values for first or last kwick
            for(j = 1; j < kwicks.size() - 1; j++) {
               if(i == j) {
                  preCalcLoTs[i][j] = o.isVertical ? j * o.min + (j * o.spacing) : j * o.min + (j * o.spacing);
               } else {
                  preCalcLoTs[i][j] = (j <= i ? (j * o.min) : (j-1) * o.min + o.max) + (j * o.spacing);
               }
            }
         }
         
         // loop through all kwick elements
         kwicks.each(function(i) {
            var kwick = $(this);
            // set initial width or height and left or top values
            // set first kwick
            if(i === 0) {
               kwick.css(LoT, '0px');
            } 
            // set last kwick
            else if(i == kwicks.size() - 1) {
               kwick.css(o.isVertical ? 'bottom' : 'right', '0px');
            }
            // set all other kwicks
            else {
               if(o.sticky) {
                  kwick.css(LoT, preCalcLoTs[o.defaultKwick][i]);
               } else {
                  kwick.css(LoT, (i * normWoH) + (i * o.spacing));
               }
            }
            // correct size in sticky mode
            if(o.sticky) {
               if(o.defaultKwick == i) {
                  kwick.css(WoH, o.max + 'px');
                  kwick.addClass('active');
               } else {
                  kwick.css(WoH, o.min + 'px');
               }
            }
            kwick.css({
               margin: 0,
               position: 'absolute'
            });
            
            kwick.bind(o.event, function() {
               // calculate previous width or heights and left or top values
               var prevWoHs = []; // prevWoHs = previous Widths or Heights
               var prevLoTs = []; // prevLoTs = previous Left or Tops
               kwicks.stop().removeClass('active');
               for(j = 0; j < kwicks.size(); j++) {
                  prevWoHs[j] = kwicks.eq(j).css(WoH).replace(/px/, '');
                  prevLoTs[j] = kwicks.eq(j).css(LoT).replace(/px/, '');
               }
               var aniObj = {};
               aniObj[WoH] = o.max;
               var maxDif = o.max - prevWoHs[i];
               var prevWoHsMaxDifRatio = prevWoHs[i]/maxDif;
               kwick.addClass('active').animate(aniObj, {
                  step: function(now) {
                     // calculate animation completeness as percentage
                     var percentage = maxDif != 0 ? now/maxDif - prevWoHsMaxDifRatio : 1;
                     // adjsut other elements based on percentage
                     kwicks.each(function(j) {
                        if(j != i) {
                           kwicks.eq(j).css(WoH, prevWoHs[j] - ((prevWoHs[j] - o.min) * percentage) + 'px');
                        }
                        if(j > 0 && j < kwicks.size() - 1) { // if not the first or last kwick
                           kwicks.eq(j).css(LoT, prevLoTs[j] - ((prevLoTs[j] - preCalcLoTs[i][j]) * percentage) + 'px');
                        }
                     });
                  },
                  duration: o.duration,
                  easing: o.easing
               });
            });
         });

         if(!o.sticky) {
            container.bind("mouseleave", function() {
               var prevWoHs = [];
               var prevLoTs = [];
               kwicks.removeClass('active').stop();
               for(i = 0; i < kwicks.size(); i++) {
                  prevWoHs[i] = kwicks.eq(i).css(WoH).replace(/px/, '');
                  prevLoTs[i] = kwicks.eq(i).css(LoT).replace(/px/, '');
               }
               var aniObj = {};
               aniObj[WoH] = normWoH;
               var normDif = normWoH - prevWoHs[0];
               kwicks.eq(0).animate(aniObj, {
                  step: function(now) {
                     var percentage = normDif != 0 ? (now - prevWoHs[0])/normDif : 1;
                     for(i = 1; i < kwicks.size(); i++) {
                        kwicks.eq(i).css(WoH, prevWoHs[i] - ((prevWoHs[i] - normWoH) * percentage) + 'px');
                        if(i < kwicks.size() - 1) {
                           kwicks.eq(i).css(LoT, prevLoTs[i] - ((prevLoTs[i] - ((i * normWoH) + (i * o.spacing))) * percentage) + 'px');
                        }
                     }
                  },
                  duration: o.duration,
                  easing: o.easing
               });
            });
         }
      });
   };
})(jQuery);