/*** EXPORT ------------------------------------------- ***/

export type Storage = {
  get<T>(key: string): T | null;
  remove(key: string): void;
  set<T>(key: string, value: T): void;
};

export function createLocalStorage(namespace: string): Storage {
  const prefix = `${namespace}:`;

  function available(): boolean {
    try {
      return typeof globalThis.localStorage !== "undefined";
    } catch {
      return false;
    }
  }

  return {
    get<T>(key: string): T | null {
      if (!available())
        return null;

      const raw = globalThis.localStorage.getItem(prefix + key);

      if (raw === null)
        return null;

      try {
        return JSON.parse(raw) as T;
      } catch {
        return null;
      }
    },
    remove(key: string): void {
      if (!available())
        return;

      globalThis.localStorage.removeItem(prefix + key);
    },
    set<T>(key: string, value: T): void {
      if (!available())
        return;

      globalThis.localStorage.setItem(prefix + key, JSON.stringify(value));
    }
  };
}

export function createMemoryStorage(): Storage {
  const store = new Map<string, string>();

  return {
    get<T>(key: string): T | null {
      const raw = store.get(key);

      if (raw === undefined)
        return null;

      try {
        return JSON.parse(raw) as T;
      } catch {
        return null;
      }
    },
    remove(key: string): void {
      store.delete(key);
    },
    set<T>(key: string, value: T): void {
      store.set(key, JSON.stringify(value));
    }
  };
}