"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
exports.onCoupleLeave = void 0;
const admin = __importStar(require("firebase-admin"));
const firestore_1 = require("firebase-functions/v2/firestore");
const push_1 = require("../notifications/push");
const idempotency_1 = require("../notifications/idempotency");
const log_1 = require("../log");
/**
 * Firestore trigger that notifies the remaining partner when a user's coupleId
 * field is cleared (i.e. the user left the couple or was removed).
 *
 * Path: users/{userId}
 * Condition: previous coupleId was non-empty and new coupleId is null/missing.
 */
exports.onCoupleLeave = (0, firestore_1.onDocumentUpdated)('users/{userId}', async (event) => {
    var _a, _b, _c, _d, _e, _f;
    const { userId } = event.params;
    const previousData = (_b = (_a = event.data) === null || _a === void 0 ? void 0 : _a.before.data()) !== null && _b !== void 0 ? _b : {};
    const currentData = (_d = (_c = event.data) === null || _c === void 0 ? void 0 : _c.after.data()) !== null && _d !== void 0 ? _d : {};
    const previousCoupleId = previousData.coupleId;
    const currentCoupleId = currentData.coupleId;
    // Only act when coupleId transitions from a real value to null/empty.
    if (!previousCoupleId || typeof previousCoupleId !== 'string') {
        return;
    }
    if (currentCoupleId) {
        return;
    }
    const db = admin.firestore();
    const coupleDoc = await db.collection('couples').doc(previousCoupleId).get();
    if (!coupleDoc.exists) {
        log_1.logger.warn(`[onCoupleLeave] couple ${previousCoupleId} not found`);
        return;
    }
    const userIds = ((_f = (_e = coupleDoc.data()) === null || _e === void 0 ? void 0 : _e.userIds) !== null && _f !== void 0 ? _f : []);
    const partnerId = userIds.find((uid) => uid !== userId);
    if (!partnerId) {
        log_1.logger.warn(`[onCoupleLeave] no partner found for couple ${previousCoupleId}`);
        return;
    }
    // Make sure the partner is still paired in this couple.
    // If both users are leaving simultaneously, avoid duplicate/phantom notifications.
    const partnerUserDoc = await db.collection('users').doc(partnerId).get();
    const partnerData = partnerUserDoc.data();
    const partnerCoupleId = partnerData === null || partnerData === void 0 ? void 0 : partnerData.coupleId;
    if (partnerCoupleId !== previousCoupleId) {
        log_1.logger.log(`[onCoupleLeave] partner ${partnerId} is no longer in couple ${previousCoupleId}; skipping notification`);
        return;
    }
    // Dedupe redelivery of this leave (at-least-once) so the partner isn't double-notified and the
    // in-app record isn't duplicated.
    if (!(await (0, idempotency_1.claimOnce)((0, idempotency_1.notifMark)(db, previousCoupleId, `leave-${userId}`)))) {
        log_1.logger.log(`[onCoupleLeave] already notified partner of ${userId} leaving; skipping`);
        return;
    }
    const notificationPayload = {
        type: 'partner_left',
        title: 'Your partner has left',
        body: 'You are no longer paired. Tap to create a new invite.',
    };
    // Write an in-app notification record for the partner.
    // This is read-only denied for clients; the Cloud Function writes it.
    await db
        .collection('users')
        .doc(partnerId)
        .collection('notification_queue')
        .add(Object.assign(Object.assign({}, notificationPayload), { read: false, createdAt: admin.firestore.FieldValue.serverTimestamp() }));
    const res = await (0, push_1.sendPushToUser)(db, admin.messaging(), partnerId, {
        notification: {
            title: notificationPayload.title,
            body: notificationPayload.body,
        },
        android: { notification: { channelId: 'partner_activity' } }, // E-OBS
        data: {
            type: notificationPayload.type,
        },
    }, partnerData);
    if (res.sent === 0 && res.failed === 0) {
        log_1.logger.log(`[onCoupleLeave] no FCM tokens for partner ${partnerId}`);
        return;
    }
    log_1.logger.log(`[onCoupleLeave] notified partner ${partnerId} that user ${userId} left couple ${previousCoupleId}`);
});
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