/**
 * Thin frontend-only crop_fill setting (#99).
 * Default 0.9 — replaces duplicated FILL = 0.9 in png/inventory + png/overlay.
 * Not a full M3 Settings surface; localStorage so it survives reloads.
 */
import { DEFAULT_CROP_FILL, clampFill } from '../png/crop';

const KEY = 'slabuploader.crop_fill';

let cached: number | null = null;

export function getCropFill(): number {
  if (cached != null) return cached;
  if (typeof localStorage === 'undefined') {
    cached = DEFAULT_CROP_FILL;
    return cached;
  }
  try {
    const raw = localStorage.getItem(KEY);
    if (raw == null) {
      cached = DEFAULT_CROP_FILL;
      return cached;
    }
    cached = clampFill(Number.parseFloat(raw));
    return cached;
  } catch {
    cached = DEFAULT_CROP_FILL;
    return cached;
  }
}

export function setCropFill(fill: number): number {
  const next = clampFill(fill);
  cached = next;
  if (typeof localStorage !== 'undefined') {
    try {
      localStorage.setItem(KEY, String(next));
    } catch {
      /* private mode / quota — in-memory still updated */
    }
  }
  return next;
}

/** Test helper: clear cached value (and optional storage). */
export function _resetCropFillForTests(): void {
  cached = null;
  if (typeof localStorage !== 'undefined') {
    try {
      localStorage.removeItem(KEY);
    } catch {
      /* ignore */
    }
  }
}