export const getDiscoveryPanelCollapseState = ({
  currentScrollTop = 0,
  lastScrollTop = 0,
  isCollapsed = false,
  threshold = 16,
  directionThreshold = 2,
  allowExpand = true,
}) => {
  const current = Math.max(Number(currentScrollTop) || 0, 0);
  const last = Math.max(Number(lastScrollTop) || 0, 0);
  const delta = current - last;

  if (delta > directionThreshold && current > threshold) {
    return true;
  }

  if (allowExpand && delta < -directionThreshold) {
    return false;
  }

  return isCollapsed;
};

export const canExpandDiscoveryPanelFromScroll = ({
  isTouching = false,
  touchDirection = "",
  lastDownGestureAt = 0,
  now = Date.now(),
  gestureRetainMs = 800,
}) => {
  if (isTouching) {
    return touchDirection === "down";
  }

  const lastDownAt = Math.max(Number(lastDownGestureAt) || 0, 0);
  if (!lastDownAt) {
    return false;
  }

  const currentTime = Math.max(Number(now) || 0, 0);
  return currentTime - lastDownAt <= gestureRetainMs;
};