(function(){

    var current = 0;

    var max = 0;

    var container;

    var interval;

    var xml;

    var animateTarget = null;

    function init(){

      container = jQuery(".slide ul");

      max = container.children().length;

      //console.log();

      events();

      interval = setInterval(next, 3000);

  }

  // 무한 롤링 셋팅

  function setting(){

    container.css("margin-left","-600px");

    container.prepend(container.children()[max-1]);

  }

  function events(){

    jQuery("button.prev").on("click", prev);

    jQuery("button.next").on("click", next);

    jQuery(window).on("keydown", keydown);

  }

  function prev( e ){

    current--;

    if( current < 0 )  current = max-1;

    animate("prev");    // pram

  }

  function next( e ){

    current++;

    if( current > max-1 ) current = 0;

    animate("next");    // pram

  }

  function animate( $direction ){

    if( animateTarget !=null ){

      TweenMax.killTweensOf( animateTarget );

      animateTarget.css("margin-left","0");

    }

    if( $direction == "next"){

      jQuery(container.children()[1]).css("margin-left","600px");

      container.append( container.children()[0] );

    } else if( $direction == "prev"){

      container.prepend( container.children()[max-1] );

      jQuery(container.children()[0]).css("margin-left","-600px");

    }

    animateTarget = jQuery(container.children()[0]);

    TweenMax.to( animateTarget, 0.8, { marginLeft:0, ease:Expo.easeOut });

    clearInterval(interval);  // 누적된어 있는것을 클리어 함

    interval = setInterval(next, 3000);  // Interval 누적됨

  }

  function keydown( e ){

    //console.log(e); 키보드 이벤트 로그

    if( e.which == 39 /*right*/ ){

        next();

    }else if( e.which == 37 /*left*/ ){

        prev();

    }

  }

  jQuery( document ).ready( init );

})();