// Ratio column to show ratio as 2 integers seperated by a colon
// image ratios are defined as 'width:height' of image
// written as a colon separating two integers


function OnInit(w) {
  w.name = 'Ratio';
  w.version = '1.0';
  w.desc = 'Column to show aspect ratio of image as 2 integers seperated by a colon';
  w.url = '';
  w.copyright = '(c)2023';
  w.default_enable = true;
  w.min_version = '12.28';
}


function OnAddColumns(z) {
  var y = z.AddColumn();
  y.name = 'ratio';
  y.label = 'Ratio';
  y.justify = 'center';
  y.type = 'wordsort';
  y.autogroup = true;
  y.autorefresh = true;
  y.method = 'OnRatio';
}


function gcd_iterative(x, y) {
  while(y) {
    var t = y;
    y = x % y;
    x = t;
  }
  return x;
}


function simplifyFraction(numerator, denominator) {
  // Get the greatest common factor of the numerator and denominator
  var gcd = gcd_iterative(numerator, denominator);

  // Divide the numerator and denominator by the GCD
  return {
    numerator: numerator / gcd,
    denominator: denominator / gcd,
  };
}


function OnRatio(x) {
  var c = x.item;
  if (c.metadata != 'image') return;

  var width = c.metadata.image.picwidth;
  var height = c.metadata.image.picheight;
  var result = simplifyFraction(width, height);
  var antecedent = result.numerator;
  var consequent = result.denominator;

  x.value = antecedent + ":" + consequent;
}