var PageTransitions = function() {

  var $main, $pages, pagesCount,
    isAnimating = false,
    endCurrPage = false,
    endNextPage = false,
    animEndEventNames = {
      'WebkitAnimation': 'webkitAnimationEnd',
      'MozAnimation': 'animationend', // mozAnimationEnd
      'OAnimation': 'oAnimationEnd',
      'msAnimation': 'MSAnimationEnd',
      'animation': 'animationend'
    },
    // animation end event name
    animEndEventName = animEndEventNames[Modernizr.prefixed('animation')],
    // support css animations
    support = Modernizr.cssanimations;

  function init(main) {
    $main = $(main);
    $pages = $main.children('.pt-page');
    pagesCount = $pages.length;

    $pages.removeClass('pt-page-current').each(function() {
      var $page = $(this);
      $page.data('originalClassList', $page.attr('class'));
    }).eq(0).addClass('pt-page-current');

    $main.get(0).className = $main.get(0).className.replace(/\s*pt-item-\d+\s*/ig, ' ');
    $main.addClass('pt-item-1');
    $main.addClass('pt-first');
    if (pagesCount == 1) {
      $main.addClass('pt-last');
    }
  }

  function gotoPage(animation, page) {
    if (isAnimating) {
      return false;
    }

    isAnimating = true;

    var $currPage = $pages.filter('.pt-page-current');

    if (page == 'prev') {
      page = $currPage.index() - 1;
    } else if (typeof(page) != 'number') {
      page = $currPage.index() + 1;
    }

    if (page < 0) {
      page = pagesCount - 1;
    } else if (page >= pagesCount) {
      page = 0;
    }

    $main.get(0).className = $main.get(0).className.replace(/\s?pt-item-\d+\s?/ig, ' ');
    $main.addClass('pt-item-'+(page+1));

    $main.removeClass('pt-first pt-last');
    if (page == 0) {
      $main.addClass('pt-first');
    }
    if (page == (pagesCount - 1)) {
      $main.addClass('pt-last');
    }

    var $nextPage = $pages.eq(page).addClass('pt-page-current'),
      outClass = '',
      inClass = '';

    switch (animation) {
    case 1:
      outClass = 'pt-page-moveToLeft';
      inClass = 'pt-page-moveFromRight';
      break;
    case 2:
      outClass = 'pt-page-moveToRight';
      inClass = 'pt-page-moveFromLeft';
      break;
    case 3:
      outClass = 'pt-page-moveToTop';
      inClass = 'pt-page-moveFromBottom';
      break;
    case 4:
      outClass = 'pt-page-moveToBottom';
      inClass = 'pt-page-moveFromTop';
      break;
    case 5:
      outClass = 'pt-page-fade';
      inClass = 'pt-page-moveFromRight pt-page-ontop';
      break;
    case 6:
      outClass = 'pt-page-fade';
      inClass = 'pt-page-moveFromLeft pt-page-ontop';
      break;
    case 7:
      outClass = 'pt-page-fade';
      inClass = 'pt-page-moveFromBottom pt-page-ontop';
      break;
    case 8:
      outClass = 'pt-page-fade';
      inClass = 'pt-page-moveFromTop pt-page-ontop';
      break;
    case 9:
      outClass = 'pt-page-moveToLeftFade';
      inClass = 'pt-page-moveFromRightFade';
      break;
    case 10:
      outClass = 'pt-page-moveToRightFade';
      inClass = 'pt-page-moveFromLeftFade';
      break;
    case 11:
      outClass = 'pt-page-moveToTopFade';
      inClass = 'pt-page-moveFromBottomFade';
      break;
    case 12:
      outClass = 'pt-page-moveToBottomFade';
      inClass = 'pt-page-moveFromTopFade';
      break;
    case 13:
      outClass = 'pt-page-moveToLeftEasing pt-page-ontop';
      inClass = 'pt-page-moveFromRight';
      break;
    case 14:
      outClass = 'pt-page-moveToRightEasing pt-page-ontop';
      inClass = 'pt-page-moveFromLeft';
      break;
    case 15:
      outClass = 'pt-page-moveToTopEasing pt-page-ontop';
      inClass = 'pt-page-moveFromBottom';
      break;
    case 16:
      outClass = 'pt-page-moveToBottomEasing pt-page-ontop';
      inClass = 'pt-page-moveFromTop';
      break;
    case 17:
      outClass = 'pt-page-scaleDown';
      inClass = 'pt-page-moveFromRight pt-page-ontop';
      break;
    case 18:
      outClass = 'pt-page-scaleDown';
      inClass = 'pt-page-moveFromLeft pt-page-ontop';
      break;
    case 19:
      outClass = 'pt-page-scaleDown';
      inClass = 'pt-page-moveFromBottom pt-page-ontop';
      break;
    case 20:
      outClass = 'pt-page-scaleDown';
      inClass = 'pt-page-moveFromTop pt-page-ontop';
      break;
    case 21:
      outClass = 'pt-page-scaleDown';
      inClass = 'pt-page-scaleUpDown pt-page-delay300';
      break;
    case 22:
      outClass = 'pt-page-scaleDownUp';
      inClass = 'pt-page-scaleUp pt-page-delay300';
      break;
    case 23:
      outClass = 'pt-page-moveToLeft pt-page-ontop';
      inClass = 'pt-page-scaleUp';
      break;
    case 24:
      outClass = 'pt-page-moveToRight pt-page-ontop';
      inClass = 'pt-page-scaleUp';
      break;
    case 25:
      outClass = 'pt-page-moveToTop pt-page-ontop';
      inClass = 'pt-page-scaleUp';
      break;
    case 26:
      outClass = 'pt-page-moveToBottom pt-page-ontop';
      inClass = 'pt-page-scaleUp';
      break;
    case 27:
      outClass = 'pt-page-scaleDownCenter';
      inClass = 'pt-page-scaleUpCenter pt-page-delay400';
      break;
    case 28:
      outClass = 'pt-page-rotateRightSideFirst';
      inClass = 'pt-page-moveFromRight pt-page-delay200 pt-page-ontop';
      break;
    case 29:
      outClass = 'pt-page-rotateLeftSideFirst';
      inClass = 'pt-page-moveFromLeft pt-page-delay200 pt-page-ontop';
      break;
    case 30:
      outClass = 'pt-page-rotateTopSideFirst';
      inClass = 'pt-page-moveFromTop pt-page-delay200 pt-page-ontop';
      break;
    case 31:
      outClass = 'pt-page-rotateBottomSideFirst';
      inClass = 'pt-page-moveFromBottom pt-page-delay200 pt-page-ontop';
      break;
    case 32:
      outClass = 'pt-page-flipOutRight';
      inClass = 'pt-page-flipInLeft pt-page-delay500';
      break;
    case 33:
      outClass = 'pt-page-flipOutLeft';
      inClass = 'pt-page-flipInRight pt-page-delay500';
      break;
    case 34:
      outClass = 'pt-page-flipOutTop';
      inClass = 'pt-page-flipInBottom pt-page-delay500';
      break;
    case 35:
      outClass = 'pt-page-flipOutBottom';
      inClass = 'pt-page-flipInTop pt-page-delay500';
      break;
    case 36:
      outClass = 'pt-page-rotateFall pt-page-ontop';
      inClass = 'pt-page-scaleUp';
      break;
    case 37:
      outClass = 'pt-page-rotateOutNewspaper';
      inClass = 'pt-page-rotateInNewspaper pt-page-delay500';
      break;
    case 38:
      outClass = 'pt-page-rotatePushLeft';
      inClass = 'pt-page-moveFromRight';
      break;
    case 39:
      outClass = 'pt-page-rotatePushRight';
      inClass = 'pt-page-moveFromLeft';
      break;
    case 40:
      outClass = 'pt-page-rotatePushTop';
      inClass = 'pt-page-moveFromBottom';
      break;
    case 41:
      outClass = 'pt-page-rotatePushBottom';
      inClass = 'pt-page-moveFromTop';
      break;
    case 42:
      outClass = 'pt-page-rotatePushLeft';
      inClass = 'pt-page-rotatePullRight pt-page-delay180';
      break;
    case 43:
      outClass = 'pt-page-rotatePushRight';
      inClass = 'pt-page-rotatePullLeft pt-page-delay180';
      break;
    case 44:
      outClass = 'pt-page-rotatePushTop';
      inClass = 'pt-page-rotatePullBottom pt-page-delay180';
      break;
    case 45:
      outClass = 'pt-page-rotatePushBottom';
      inClass = 'pt-page-rotatePullTop pt-page-delay180';
      break;
    case 46:
      outClass = 'pt-page-rotateFoldLeft';
      inClass = 'pt-page-moveFromRightFade';
      break;
    case 47:
      outClass = 'pt-page-rotateFoldRight';
      inClass = 'pt-page-moveFromLeftFade';
      break;
    case 48:
      outClass = 'pt-page-rotateFoldTop';
      inClass = 'pt-page-moveFromBottomFade';
      break;
    case 49:
      outClass = 'pt-page-rotateFoldBottom';
      inClass = 'pt-page-moveFromTopFade';
      break;
    case 50:
      outClass = 'pt-page-moveToRightFade';
      inClass = 'pt-page-rotateUnfoldLeft';
      break;
    case 51:
      outClass = 'pt-page-moveToLeftFade';
      inClass = 'pt-page-rotateUnfoldRight';
      break;
    case 52:
      outClass = 'pt-page-moveToBottomFade';
      inClass = 'pt-page-rotateUnfoldTop';
      break;
    case 53:
      outClass = 'pt-page-moveToTopFade';
      inClass = 'pt-page-rotateUnfoldBottom';
      break;
    case 54:
      outClass = 'pt-page-rotateRoomLeftOut pt-page-ontop';
      inClass = 'pt-page-rotateRoomLeftIn';
      break;
    case 55:
      outClass = 'pt-page-rotateRoomRightOut pt-page-ontop';
      inClass = 'pt-page-rotateRoomRightIn';
      break;
    case 56:
      outClass = 'pt-page-rotateRoomTopOut pt-page-ontop';
      inClass = 'pt-page-rotateRoomTopIn';
      break;
    case 57:
      outClass = 'pt-page-rotateRoomBottomOut pt-page-ontop';
      inClass = 'pt-page-rotateRoomBottomIn';
      break;
    case 58:
      outClass = 'pt-page-rotateCubeLeftOut pt-page-ontop';
      inClass = 'pt-page-rotateCubeLeftIn';
      break;
    case 59:
      outClass = 'pt-page-rotateCubeRightOut pt-page-ontop';
      inClass = 'pt-page-rotateCubeRightIn';
      break;
    case 60:
      outClass = 'pt-page-rotateCubeTopOut pt-page-ontop';
      inClass = 'pt-page-rotateCubeTopIn';
      break;
    case 61:
      outClass = 'pt-page-rotateCubeBottomOut pt-page-ontop';
      inClass = 'pt-page-rotateCubeBottomIn';
      break;
    case 62:
      outClass = 'pt-page-rotateCarouselLeftOut pt-page-ontop';
      inClass = 'pt-page-rotateCarouselLeftIn';
      break;
    case 63:
      outClass = 'pt-page-rotateCarouselRightOut pt-page-ontop';
      inClass = 'pt-page-rotateCarouselRightIn';
      break;
    case 64:
      outClass = 'pt-page-rotateCarouselTopOut pt-page-ontop';
      inClass = 'pt-page-rotateCarouselTopIn';
      break;
    case 65:
      outClass = 'pt-page-rotateCarouselBottomOut pt-page-ontop';
      inClass = 'pt-page-rotateCarouselBottomIn';
      break;
    case 66:
      outClass = 'pt-page-rotateSidesOut';
      inClass = 'pt-page-rotateSidesIn pt-page-delay200';
      break;
    case 67:
      outClass = 'pt-page-rotateSlideOut';
      inClass = 'pt-page-rotateSlideIn';
      break;
    case 68:
        outClass = 'pt-page-fade-out';
        inClass = 'pt-page-fade-in pt-page-delay400';
        break;
    default:
      outClass = 'pt-page-moveToLeft';
      inClass = 'pt-page-moveFromRight';
      break;
    }

    $currPage.addClass(outClass).on(animEndEventName, function() {
      $currPage.off(animEndEventName);
      endCurrPage = true;
      if (endNextPage) {
        onEndAnimation($currPage, $nextPage);
      }
    });

    $nextPage.addClass(inClass).on(animEndEventName, function() {
      $nextPage.off(animEndEventName);
      endNextPage = true;
      if (endCurrPage) {
        onEndAnimation($currPage, $nextPage);
      }
    });

    if (!support) {
      onEndAnimation($currPage, $nextPage);
    }
  }

  function onEndAnimation($outpage, $inpage) {
    endCurrPage = false;
    endNextPage = false;
    resetPage($outpage, $inpage);
    isAnimating = false;
  }

  function resetPage($outpage, $inpage) {
    $outpage.attr('class', $outpage.data('originalClassList'));
    $inpage.attr('class', $inpage.data('originalClassList') + ' pt-page-current');
  }

  return {
    init: init,
    gotoPage: gotoPage
  };

};