export const MIN_FOCUS_NODE_TARGET_ZOOM = 0.1;
export const MAX_FOCUS_NODE_TARGET_ZOOM = 2;
export const FOCUS_NODE_TARGET_ZOOM_STEP = 0.01;

export type FocusNodeTargetZoom = number;

export function normalizeFocusNodeTargetZoom(
  value: unknown,
  fallback: FocusNodeTargetZoom
): FocusNodeTargetZoom {
  if (typeof value !== "number" || !Number.isFinite(value)) {
    return fallback;
  }

  const clamped = Math.max(
    MIN_FOCUS_NODE_TARGET_ZOOM,
    Math.min(MAX_FOCUS_NODE_TARGET_ZOOM, value)
  );
  // Keep persisted values stable and avoid float noise.
  const normalized =
    Math.round(clamped / FOCUS_NODE_TARGET_ZOOM_STEP) *
    FOCUS_NODE_TARGET_ZOOM_STEP;
  return Number(normalized.toFixed(2));
}