import { randomBytes } from 'crypto';

export interface IssuedToken {
  token: string;
  userId: string;
  username: string;
  displayName: string;
  signalingServerUrl: string;
  issuedAt: number;
  expiresAt: number;
}

const TOKEN_TTL_MS = 24 * 60 * 60 * 1000;
const tokens = new Map<string, IssuedToken>();

export function issueToken(params: {
  userId: string;
  username: string;
  displayName: string;
  signalingServerUrl: string;
}): IssuedToken {
  const token = randomBytes(32).toString('hex');
  const issuedAt = Date.now();
  const issued: IssuedToken = {
    token,
    issuedAt,
    expiresAt: issuedAt + TOKEN_TTL_MS,
    userId: params.userId,
    username: params.username,
    displayName: params.displayName,
    signalingServerUrl: params.signalingServerUrl
  };

  tokens.set(token, issued);
  return issued;
}

export function consumeToken(token: string): IssuedToken | null {
  const issued = tokens.get(token);

  if (!issued) {
    return null;
  }

  if (issued.expiresAt < Date.now()) {
    tokens.delete(token);
    return null;
  }

  return issued;
}

export function revokeToken(token: string): void {
  tokens.delete(token);
}

export function clearAllTokens(): void {
  tokens.clear();
}

export function pruneExpiredTokens(): void {
  const now = Date.now();

  for (const [token, issued] of tokens) {
    if (issued.expiresAt < now) {
      tokens.delete(token);
    }
  }
}