/*
 * Check if an argument is a positition value candidate
 * - unit
 * - literal with calc
 */
-is-position-value($value) {
  return type($value) == 'unit' || (type($value) == 'literal' && match('^calc(.*?)$', $value));
}

/*
 * Position helper
 *
 * Examples:
 *   position(right 10px)
 *   position(top 0 left 0)
 *   position(top left)
 *   position(center)
 *   position(cover)
 *
 */

position() {
  _return = false;

  if current-property {
    add-property(current-property, arguments);
    _return = true;
  }
  return if _return;

  return if length(arguments) == 0;

  // position(center)
  if (length(arguments) == 1 && arguments[0] == center) {
    top: 50%;
    left: 50%;
    transform: translateY(-50%) translateX(-50%);
    _return = true;
  }
  return if _return;

  // position(cover)
  if (length(arguments) == 1 && arguments[0] == cover) {
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    _return = true;
  }
  return if _return;

  // position([<anchor> <unit>])
  $i = 0;

  for $j in (1..4) {
    if length(arguments) > $i { // @stylint off
      {arguments[$i]}: -is-position-value(arguments[$i + 1]) ? arguments[$i += 1] : 0
      $i += 1;
    }
  }
}

/*
 * Absolute position helper
 *
 * Examples:
 *   absolute()
 *   absolute(right 10px)
 *   absolute(top 0 left 0)
 *   absolute(top left)
 *   absolute(center)
 *   absolute(cover)
 */
absolute() {
  position: absolute;
  position(arguments);
}

/*
 * Fixed position helper
 *
 * Examples:
 *   fixed()
 *   fixed(right 10px)
 *   fixed(top 0 left 0)
 *   fixed(top left)
 *   fixed(center)
 *   fixed(cover)
 */
fixed() {
  position: fixed;
  position(arguments);
}

/*
 * Relative position helper
 *
 * Examples:
 *   relative()
 *   relative(right 10px)
 *   relative(top 0 left 0)
 *   relative(top left)
 */
relative() {
  position: relative;
  position(arguments);
}

/*
 * Static position helper
 *
 * Examples:
 *   static()
 *   static(right 10px)
 *   static(top 0 left 0)
 *   static(top left)
 */
static() {
  position: static;
  position(arguments);
}

/*
 * Sticky position helper
 *
 * Examples:
 *   sticky()
 *   sticky(right 10px)
 *   sticky(top 0 left 0)
 *   sticky(top left)
 */
sticky() {
  position: sticky;
  position(arguments);
}