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import { customAlphabet } from "nanoid";
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import { TEMP_MAILBOX_TTL_HOURS, type TempMailboxTtlHours } from "@/shared/contracts";
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import type { InboxRecord } from "@/worker/types";
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export const createLocalPart = customAlphabet("abcdefghijklmnopqrstuvwxyz0123456789", 10);
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export const ADMIN_SESSION_TTL_MS = 60 * 60 * 1000;
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export const WEBSOCKET_TICKET_TTL_MS = 60 * 1000;
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export const EXPIRED_INBOX_CLEANUP_BATCH_SIZE = 100;
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export const RESERVED_ADDRESSES = ["admin", "postmaster", "abuse", "webmaster"] as const;
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export const RESERVED_ADDRESS_VALUES = [...RESERVED_ADDRESSES];
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export function hoursToMs(hours: number) {
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  return hours * 60 * 60 * 1000;
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}
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export function normalizeDomainName(domainName: string) {
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  return domainName.trim().toLowerCase();
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}
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export function isAllowedTempMailboxTtl(hours: number): hours is TempMailboxTtlHours {
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  return TEMP_MAILBOX_TTL_HOURS.includes(hours as TempMailboxTtlHours);
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}
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export function ttlHoursFromInbox(inbox: InboxRecord) {
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  if (!inbox.expiresAt) {
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    return null;
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  }
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  const ttlHours = Math.round((inbox.expiresAt.getTime() - inbox.createdAt.getTime()) / hoursToMs(1));
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  return isAllowedTempMailboxTtl(ttlHours) ? ttlHours : null;
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}
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export function computeInboxExpiry(createdAt: Date, ttlHours: TempMailboxTtlHours) {
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  return new Date(createdAt.getTime() + hoursToMs(ttlHours));
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}