export interface GeneratorOptions {
  length: number;
  includeUppercase: boolean;
  includeLowercase: boolean;
  includeNumbers: boolean;
  includeSymbols: boolean;
}

/**
 * Generate a cryptographically random password.
 */
export function generatePassword(options: Partial<GeneratorOptions> = {}): string {
  const {
    length = 20,
    includeUppercase = true,
    includeLowercase = true,
    includeNumbers = true,
    includeSymbols = true,
  } = options;

  let chars = "";
  if (includeLowercase) chars += "abcdefghijklmnopqrstuvwxyz";
  if (includeUppercase) chars += "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  if (includeNumbers) chars += "0123456789";
  if (includeSymbols) chars += "!@#$%^&*";

  if (chars.length === 0) chars = "abcdefghijklmnopqrstuvwxyz";

  const array = crypto.getRandomValues(new Uint32Array(length));
  let password = "";
  for (let i = 0; i < length; i++) {
    password += chars[array[i] % chars.length];
  }
  return password;
}