/**
 * Org default inbound policy: every email domain accepts inbound mail via
 * catch-all store with bounded retention, so replies to platform-sent mail
 * are never bounced by omission. Explicit SmartMTA routes always outrank
 * this no-route fallback; explicit per-domain policies are preserved.
 */

export interface IInboundPolicyLike {
  defaultAction: 'store' | 'reject';
  retentionDays: number;
}

export const DEFAULT_INBOUND_POLICY: IInboundPolicyLike = Object.freeze({
  defaultAction: 'store',
  retentionDays: 30,
});

export function applyDefaultInboundPolicy<T extends { inboundPolicy?: IInboundPolicyLike }>(
  domainsArg: T[] | undefined,
): T[] {
  return (domainsArg || []).map((domain) => ({
    ...domain,
    inboundPolicy: domain.inboundPolicy ?? { ...DEFAULT_INBOUND_POLICY },
  }));
}