63 lines
2.0 KiB
TypeScript
63 lines
2.0 KiB
TypeScript
import * as functions from 'firebase-functions'
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import * as admin from 'firebase-admin'
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const LOVE = 'love'
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interface SwipeEntry {
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action?: string
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swipedAt?: number
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}
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/**
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* Creates a revealed date match when both partners have swiped LOVE on the
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* same date idea.
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*
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* Trigger: couples/{coupleId}/date_swipes/{dateIdeaId} (onWrite)
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*
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* The `date_matches` collection is server-write-only — Firestore rules deny all
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* client writes (`allow create, update, delete: if false`). This trigger is
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* therefore the single source of truth for match creation. The client only
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* records swipes and observes `date_matches` for the result.
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*
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* Idempotency: the match document id is the date idea id and creation runs in a
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* transaction, so repeated swipes on the same idea and concurrent invocations
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* never produce a duplicate match.
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*/
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export const createDateMatchOnMutualLove = functions.firestore
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.document('couples/{coupleId}/date_swipes/{dateIdeaId}')
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.onWrite(async (change, context) => {
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const after = change.after.data()
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if (!after) return // swipe document was deleted
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const actions = (after.actions ?? {}) as Record<string, SwipeEntry>
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const lovedBy = Object.entries(actions)
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.filter(([, entry]) => entry?.action === LOVE)
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.map(([uid]) => uid)
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.sort()
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// A match needs both partners to have loved the same idea.
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if (lovedBy.length < 2) return
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const { coupleId, dateIdeaId } = context.params as {
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coupleId: string
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dateIdeaId: string
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}
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const db = admin.firestore()
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const matchRef = db
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.collection('couples')
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.doc(coupleId)
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.collection('date_matches')
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.doc(dateIdeaId)
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await db.runTransaction(async (tx) => {
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const existing = await tx.get(matchRef)
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if (existing.exists) return // already matched — no-op
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tx.set(matchRef, {
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dateIdeaId,
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matchedBy: lovedBy,
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revealedAt: admin.firestore.FieldValue.serverTimestamp(),
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})
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})
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})
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