const DEFAULT_VISIBLE_EDGE = 4;

export type RedactableValue = string | null | undefined;

export function redactSecret(value: RedactableValue, visibleEdge: number = DEFAULT_VISIBLE_EDGE): string {
  return redactValue(value, { visibleEdge, label: "secret" });
}

export function redactPairingCode(value: RedactableValue, visibleEdge: number = DEFAULT_VISIBLE_EDGE): string {
  return redactValue(value, { visibleEdge, label: "pairingCode" });
}

export function redactKey(value: RedactableValue, visibleEdge: number = DEFAULT_VISIBLE_EDGE): string {
  return redactValue(value, { visibleEdge, label: "key" });
}

export function redactValue(
  value: RedactableValue,
  options: { visibleEdge?: number; label?: string } = {}
): string {
  const visibleEdge = options.visibleEdge ?? DEFAULT_VISIBLE_EDGE;
  const label = options.label ?? "value";

  if (!value) {
    return `<redacted:${label}:empty>`;
  }

  if (value.length <= visibleEdge * 2) {
    return `<redacted:${label}:${value.length}>`;
  }

  return `${value.slice(0, visibleEdge)}…${value.slice(-visibleEdge)} <redacted:${label}:${value.length}>`;
}

export function safeErrorMessage(error: unknown): string {
  if (error instanceof Error) {
    return error.message;
  }

  return String(error);
}