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import rndstr from 'rndstr';
import { Note } from '@/models/entities/note.js';
import { User } from '@/models/entities/user.js';
import { PromoReads, PromoNotes, Notes, Users } from '@/models/index.js';
export async function injectPromo(timeline: Note[], user?: User | null) {
if (timeline.length < 5) return;
// TODO: readやexpireフィルタはクエリ側でやる
const reads = user ? await PromoReads.findBy({
userId: user.id,
}) : [];
let promos = await PromoNotes.find();
promos = promos.filter(n => n.expiresAt.getTime() > Date.now());
promos = promos.filter(n => !reads.map(r => r.noteId).includes(n.noteId));
if (promos.length === 0) return;
// Pick random promo
const promo = promos[Math.floor(Math.random() * promos.length)];
const note = await Notes.findOneByOrFail({ id: promo.noteId });
// Join
note.user = await Users.findOneByOrFail({ id: note.userId });
(note as any)._prId_ = rndstr('a-z0-9', 8);
// Inject promo
timeline.splice(3, 0, note);
}
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