import {
  registerOidcClient,
  OidcClientConfig,
  OidcRegistrationClientMetadata,
  createClient,
  MatrixClient,
} from "matrix-js-sdk";
import { SessionConfigStore, SessionConfig } from "./storage/SessionStore.js";

const CLIENT_PREFIX = "wildcard";

export class SessionManager {
  store: SessionConfigStore;
  constructor(store: SessionConfigStore) {
    this.store = store;
  }
  async createSession(config: SessionConfig): Promise<MatrixClient> {
    const client = createClient({
      baseUrl: config.baseUrl,
      accessToken: config.accessToken,
      deviceId: config.deviceId,
      ...(config.refreshToken && { refreshToken: config.refreshToken }),
    });
    void (await this.store.storeNewSessionConfig(config));
    return client;
  }
}

/**
 * Registers a client with the homeserver for authentication.
 * @param oidcClientConfig - The OIDC client configuration provided by MatrixClient.getAuthMetadata().
 * @param clientMetadata - The OIDC registration client metadata, should be configured by your app.
 * @returns A promise that resolves to the client ID you should use when logging in clients.
 */
export async function registerClientWithHomeserver(
  oidcClientConfig: OidcClientConfig,
  clientMetadata: OidcRegistrationClientMetadata,
): Promise<string> {
  const clientId = await registerOidcClient(oidcClientConfig, clientMetadata);
  return clientId;
}

export function generateDeviceId(): string {
  function generateRandomChars(length: number): string {
    const allowedCharacters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    let result = "";
    for (let i = 0; i < length; i++) {
      result += allowedCharacters.charAt(Math.floor(Math.random() * allowedCharacters.length));
    }
    return result;
  }
  return CLIENT_PREFIX + generateRandomChars(10);
}