/**
 * Minimal key-value storage adapter.
 * Pass `localStorage` in browser environments, or any Map-backed adapter for Node.js / tests.
 */
export interface IPluginStorage {
  getItem(key: string): string | null;
  setItem(key: string, value: string): void;
}

/**
 * Minimal event emitter interface for the plugin events API.
 * Compatible with Node.js EventEmitter, matrix-js-sdk MatrixClient, and similar clients.
 */
export interface IPluginEventClient {
  on(event: string, handler: (...args: any[]) => void): void;
  off(event: string, handler: (...args: any[]) => void): void;
}

/**
 * In-memory storage implementation — used as the default when no storage adapter is provided.
 */
export class MemoryStorage implements IPluginStorage {
  private readonly store = new Map<string, string>();

  /** @inheritdoc */
  getItem(key: string): string | null {
    return this.store.get(key) ?? null;
  }

  /** @inheritdoc */
  setItem(key: string, value: string): void {
    this.store.set(key, value);
  }
}