import { type IStorageGateway } from '@/application/ports/output/IStorageGateway';

export class LocalStorageGateway implements IStorageGateway {
  save<T>(key: string, value: T): void {
    window.localStorage.setItem(key, JSON.stringify(value));
  }

  load<T>(key: string): T | null {
    const raw = window.localStorage.getItem(key);
    if (raw === null) {
      return null;
    }
    try {
      return JSON.parse(raw) as T;
    } catch {
      return null;
    }
  }

  remove(key: string): void {
    window.localStorage.removeItem(key);
  }

  listKeys(prefix: string): string[] {
    const keys: string[] = [];
    for (let i = 0; i < window.localStorage.length; i++) {
      const key = window.localStorage.key(i);
      if (key !== null && key.startsWith(prefix)) {
        keys.push(key);
      }
    }
    return keys;
  }
}