/**
* author Remy Sharp
* url http://remysharp.com/tag/marquee
*/
(function ($) {
 $.fn.marquee = function (klass) {
 var newMarquee = [],
 last = this.length;
 // works out the left or right hand reset position, based on scroll
 // behavior, current direction and new direction
 function getReset(newDir, marqueeRedux, marqueeState) {
 var behavior = marqueeState.behavior, width = marqueeState.width, dir = marqueeState.dir;
 var r = 0;
 if (behavior == 'alternate') {
 r = newDir == 1 ? marqueeRedux[marqueeState.widthAxis] - (width*2) : width;
 } else if (behavior == 'slide') {
 if (newDir == -1) {
 r = dir == -1 ? marqueeRedux[marqueeState.widthAxis] : width;
 } else {
 r = dir == -1 ? marqueeRedux[marqueeState.widthAxis] - (width*2) : 0;
 }
 } else {
 r = newDir == -1 ? marqueeRedux[marqueeState.widthAxis] : 0;
 }
 return r;
 }
 // single "thread" animation
 function animateMarquee() {
 var i = newMarquee.length,
 marqueeRedux = null,
 $marqueeRedux = null,
 marqueeState = {},
 newMarqueeList = [],
 hitedge = false;
 
 while (i--) {
 marqueeRedux = newMarquee[i];
 $marqueeRedux = $(marqueeRedux);
 marqueeState = $marqueeRedux.data('marqueeState');
 
 if ($marqueeRedux.data('paused') !== true) {
 // TODO read scrollamount, dir, behavior, loops and last from data
 marqueeRedux[marqueeState.axis] += (marqueeState.scrollamount * marqueeState.dir);
 // only true if it's hit the end
 hitedge = marqueeState.dir == -1 ? marqueeRedux[marqueeState.axis] <= getReset(marqueeState.dir * -1, marqueeRedux, marqueeState) : marqueeRedux[marqueeState.axis] >= getReset(marqueeState.dir * -1, marqueeRedux, marqueeState);
 
 if ((marqueeState.behavior == 'scroll' && marqueeState.last == marqueeRedux[marqueeState.axis]) || (marqueeState.behavior == 'alternate' && hitedge && marqueeState.last != -1) || (marqueeState.behavior == 'slide' && hitedge && marqueeState.last != -1)) { 
 if (marqueeState.behavior == 'alternate') {
 marqueeState.dir *= -1; // flip
 }
 marqueeState.last = -1;
 $marqueeRedux.trigger('stop');
 marqueeState.loops--;
 if (marqueeState.loops === 0) {
 if (marqueeState.behavior != 'slide') {
 marqueeRedux[marqueeState.axis] = getReset(marqueeState.dir, marqueeRedux, marqueeState);
 } else {
 // corrects the position
 marqueeRedux[marqueeState.axis] = getReset(marqueeState.dir * -1, marqueeRedux, marqueeState);
 }
 $marqueeRedux.trigger('end');
 } else {
 // keep this marquee going
 newMarqueeList.push(marqueeRedux);
 $marqueeRedux.trigger('start');
 marqueeRedux[marqueeState.axis] = getReset(marqueeState.dir, marqueeRedux, marqueeState);
 }
 } else {
 newMarqueeList.push(marqueeRedux);
 }
 marqueeState.last = marqueeRedux[marqueeState.axis];
 // store updated state only if we ran an animation
 $marqueeRedux.data('marqueeState', marqueeState);
 } else {
 // even though it's paused, keep it in the list
 newMarqueeList.push(marqueeRedux); 
 }
 }
 newMarquee = newMarqueeList;
 
 if (newMarquee.length) {
 setTimeout(animateMarquee, 45);
 } 
 }
 
 // TODO consider whether using .html() in the wrapping process could lead to loosing predefined events...
 this.each(function (i) {
 var $marquee = $(this),
 width = $marquee.attr('width') || $marquee.width(),
 height = $marquee.attr('height') || $marquee.height(),
 $marqueeRedux = $marquee.after('<div ' + (klass ? 'class="' + klass + '" ' : '') + 'style="display: block-inline; width: ' + width + 'px; height: ' + height + 'px; overflow: hidden;"><div style="float: left; white-space: normal;">' + $marquee.html() + '</div></div>').next(),
 marqueeRedux = $marqueeRedux.get(0),
 hitedge = 0,
 direction = ($marquee.attr('direction') || 'left').toLowerCase(),
 marqueeState = {
 dir : /down|right/.test(direction) ? -1 : 1,
 axis : /left|right/.test(direction) ? 'scrollLeft' : 'scrollTop',
 widthAxis : /left|right/.test(direction) ? 'scrollWidth' : 'scrollHeight',
 last : -1,
 loops : $marquee.attr('loop') || -1,
 scrollamount : $marquee.attr('scrollamount') || this.scrollAmount || 2,
 behavior : ($marquee.attr('behavior') || 'scroll').toLowerCase(),
 width : /left|right/.test(direction) ? width : height
 };
 
 // corrects a bug in Firefox - the default loops for slide is -1
 if ($marquee.attr('loop') == -1 && marqueeState.behavior == 'slide') {
 marqueeState.loops = 1;
 }
 $marquee.remove();
 
 // add padding
 if (/left|right/.test(direction)) {
 $marqueeRedux.find('> div').css('padding', '0 ' + width + 'px');
 } else {
 $marqueeRedux.find('> div').css('padding', height + 'px 0');
 }
 
 // events
 $marqueeRedux.bind('stop', function () {
 $marqueeRedux.data('paused', true);
 }).bind('pause', function () {
 $marqueeRedux.data('paused', true);
 }).bind('start', function () {
 $marqueeRedux.data('paused', false);
 }).bind('unpause', function () {
 $marqueeRedux.data('paused', false);
 }).data('marqueeState', marqueeState); // finally: store the state
 
 // todo - rerender event allowing us to do an ajax hit and redraw the marquee
 newMarquee.push(marqueeRedux);
 marqueeRedux[marqueeState.axis] = getReset(marqueeState.dir, marqueeRedux, marqueeState);
 $marqueeRedux.trigger('start');
 
 // on the very last marquee, trigger the animation
 if (i+1 == last) {
 animateMarquee();
 }
 }); 
 return $(newMarquee);
 };
}(jQuery));