// The `createAndAttach` action every Festipod collection handler uses (attendees, contacts), in place
// of the one `PodCollectionsHandlerMixin` (@activitypods/app 2.3.2) gives them.
//
// The mixin's version calls `pod-collections.createAndAttach`, then derives a WAC group slug from the
// collection URI it returns. That call returns undefined when it attaches nothing — the resource
// already carries a value for the predicate (written by its creator or by another app), or the pod
// refused to create the collection — and the mixin then runs `new URL(undefined)`, which throws. The
// webhook call that runs the watcher is not awaited by the platform, so that throw ended the whole
// backend process (observed 2026-10-12, an event POSTed with `apods:attendees` already set). Here,
// nothing attached means no group to create.

/** The action definition; runs bound to a service with the mixin's settings and `getGroupSlugFromCollectionUri`. */
const guardedCreateAndAttach = {
  async handler(ctx) {
    const { resourceUri, actorUri } = ctx.params;
    const { attachPredicate, collectionOptions, createWacGroup } = this.settings;

    const collectionUri = await ctx.call('pod-collections.createAndAttach', {
      resourceUri,
      attachPredicate,
      collectionOptions,
      actorUri
    });
    if (!collectionUri) {
      this.logger.info(`No ${attachPredicate} collection attached to ${resourceUri} (already carries one, or creation refused)`);
      return undefined;
    }
    // The service's own follow-up for a collection it has just created (attendees: record it as
    // Festipod's, see public-read-ledger.js) — right after the attach, so a failure of what follows
    // (the WAC group) cannot skip it.
    if (typeof this.onCollectionAttached === 'function') {
      await this.onCollectionAttached(ctx, { resourceUri, collectionUri, actorUri });
    }

    if (createWacGroup) {
      await ctx.call('pod-wac-groups.create', {
        groupSlug: this.getGroupSlugFromCollectionUri(collectionUri),
        actorUri
      });
    }
    return collectionUri;
  }
};

module.exports = { guardedCreateAndAttach };