$(function() {
  /* Convert score to numeric number for sorting */
  $.tablesorter.addParser({
    id: 'score',
    format: function(s, table, cell, cellIndex) {
      return s.replace(/¼/,'.25');
      return s.replace(/½/,'.5');
      return s.replace(/¾/,'.75');
    },
    type: 'numeric'
  });

  /* Sort a tournament table with tablesorter */
  $('.tablesorter th.score').data('sorter', false);
  $('.tablesorter th.points').data('sorter', 'score');
  $('.tablesorter th.berger').data('sorter', 'score');
  $('.tablesorter').tablesorter({
    theme       : 'blue',
    widgets     : ['zebra'],
    sortReset   : true,
    sortRestart : true
  });

  /* Navigate through game moves by mouse wheel over the chess board */
  $('#GameBoard').mousewheel(function(event) {
    if (event.deltaY == -1) {
      $('#forwardButton').click();
    } else if (event.deltaY == 1) {
      $('#backButton').click();
    }
    event.stopPropagation();
    return false;
  });
})

function customFunctionOnPgnGameLoad() {
  /* Stylize pgn4web elements by Bootstrap */
  $('#GameSelSelect').addClass('form-control');
  $('#autoplayButton').click(refreshButtonset);

  /* No titles for mouse wheel over the chess board */
  $('#GameBoard .pieceImage').removeAttr('title');
}

function customFunctionOnMove() {
  refreshButtonset();

  /* Scroll the game text to the current move */
  var $gameText = $('#GameText');
  var $moveOn = $gameText.find('.moveOn:first');
  var gtHeight = $gameText.height();
  if ($moveOn.length) {
    var height = $moveOn.height();
    var y = $moveOn.position().top;
    if (y < height * 5) {
      $gameText.scrollTop($gameText.scrollTop() + y - height * 5);
    } else if (y > (gtHeight - height * 6)) {
      $gameText.scrollTop($gameText.scrollTop() + y + height * 6 - gtHeight);
    }
  }
}

function refreshButtonset() {
  $('#GameButtons input').addClass('btn btn-default');
}