import { calendarHref } from "@/worker/caldav/paths";
import type { CalDavDoDb } from "@/worker/db/cal-dav-do/client";
import { calendarSyncToken, ensureCalendar, latestChangeSeq, objectByName } from "@/worker/db/cal-dav-do/repository";
import { calDavError, type CalDavError } from "@/worker/objects/cal-dav/types";
import {
  collectionWritePrecondition,
  type CollectionConditionalInput,
} from "@/worker/objects/common/collection-preconditions";

export type CalendarConditionalInput = CollectionConditionalInput;

export function calendarWritePrecondition(
  db: CalDavDoDb,
  input: CalendarConditionalInput,
  targetHref: string,
  targetEtag: string | null,
): CalDavError | null {
  return collectionWritePrecondition(db, input, targetHref, targetEtag, {
    basePath: "/calendars",
    collectionHref: calendarHref,
    ensureCollection: ensureCalendar,
    objectEtag: (db, calendarId, objectName) => objectByName(db, calendarId, objectName)?.etag ?? null,
    latestChangeSeq,
    syncToken: calendarSyncToken,
    preconditionFailed: (message) => calDavError(412, "precondition_failed", message),
  });
}