export interface StorageAdapter {
  get(key: string[]): Promise<Record<string, any> | undefined>;
  remove(key: string[]): Promise<void>;
  set(key: string[], value: any, expiry?: Date): Promise<void>;
  scan(prefix: string[]): AsyncIterable<[string[], any]>;
}

const SEPERATOR = String.fromCharCode(0x1f);

export function joinKey(key: string[]) {
  return key.join(SEPERATOR);
}

export function splitKey(key: string) {
  return key.split(SEPERATOR);
}

export namespace Storage {
  function encode(key: string[]) {
    return key.map((k) => k.replaceAll(SEPERATOR, ""));
  }
  export function get<T>(adapter: StorageAdapter, key: string[]) {
    return adapter.get(encode(key)) as Promise<T | null>;
  }

  export function set(adapter: StorageAdapter, key: string[], value: any, ttl?: number) {
    const expiry = ttl ? new Date(Date.now() + ttl * 1000) : undefined;
    return adapter.set(encode(key), value, expiry);
  }

  export function remove(adapter: StorageAdapter, key: string[]) {
    return adapter.remove(encode(key));
  }

  export function scan<T>(adapter: StorageAdapter, key: string[]): AsyncIterable<[string[], T]> {
    return adapter.scan(encode(key));
  }
}