// Copyright (c) 2026 PowerOn AG
// All rights reserved.
/**
 * LayoutPersistenceAdapter — pluggable persistence for layout state.
 *
 * Default implementation uses localStorage.
 * NOT used for navigation state (URL is source-of-truth) or settings values (DB).
 * Use for: panel widths, collapse state, user UI preferences.
 */

import type { LayoutPersistenceAdapter } from './types';

const PREFIX = 'po_layout_';

function _buildKey(scope: string, key: string): string {
  return `${PREFIX}${scope}:${key}`;
}

export function _createLocalStorageAdapter(scope: string): LayoutPersistenceAdapter {
  return {
    scope,
    load<T>(key: string): T | null {
      try {
        const raw = localStorage.getItem(_buildKey(scope, key));
        if (raw === null) return null;
        return JSON.parse(raw) as T;
      } catch {
        return null;
      }
    },
    save<T>(key: string, value: T): void {
      try {
        localStorage.setItem(_buildKey(scope, key), JSON.stringify(value));
      } catch {
        // localStorage full or unavailable — silently ignore for UI preferences
      }
    },
  };
}