"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
exports.isDeadTokenError = isDeadTokenError;
exports.selectDeadTokens = selectDeadTokens;
exports.pruneDeadTokens = pruneDeadTokens;
const admin = __importStar(require("firebase-admin"));
/**
 * FCM error codes that mean a token is *permanently* dead and safe to delete.
 *
 * Deliberately narrow. We only prune on errors that unambiguously blame the TOKEN:
 *   - `registration-token-not-registered` — the app was uninstalled / data-cleared / token rotated.
 *   - `invalid-registration-token`        — the token string itself is malformed.
 * We intentionally do NOT include `messaging/invalid-argument` or any transient/server error
 * (`unavailable`, `internal`, `quota-exceeded`, auth issues): those can be caused by a bad *payload*
 * or a temporary outage, and treating them as dead would let one bug wipe every user's tokens.
 */
const DEAD_TOKEN_CODES = new Set([
    'messaging/registration-token-not-registered',
    'messaging/invalid-registration-token',
]);
/** Extract the `messaging/*` code from a firebase-admin messaging rejection, wherever it lives. */
function messagingErrorCode(reason) {
    var _a, _b;
    const r = reason;
    const code = (_b = (_a = r === null || r === void 0 ? void 0 : r.errorInfo) === null || _a === void 0 ? void 0 : _a.code) !== null && _b !== void 0 ? _b : r === null || r === void 0 ? void 0 : r.code;
    return typeof code === 'string' ? code : undefined;
}
/** True only when an FCM send rejection means the token is permanently invalid (safe to delete). */
function isDeadTokenError(reason) {
    const code = messagingErrorCode(reason);
    return code !== undefined && DEAD_TOKEN_CODES.has(code);
}
/**
 * Pure: given the same `tokens` array and `Promise.allSettled` results a caller already has, return the
 * distinct token strings that FCM reported as permanently dead. Index `i` in results maps to `tokens[i]`.
 */
function selectDeadTokens(tokens, results) {
    const dead = new Set();
    results.forEach((r, i) => {
        const token = tokens[i];
        if (r.status === 'rejected' && token && isDeadTokenError(r.reason))
            dead.add(token);
    });
    return [...dead];
}
/**
 * Best-effort removal of tokens FCM reported as permanently dead. Pass the `tokens` array and the
 * `Promise.allSettled` results from the send you just performed; any dead token is deleted from the
 * user's `fcmTokens` subcollection and cleared from the legacy `fcmToken` field if it matches.
 *
 * Never throws — pruning is housekeeping and must never fail the notification path it runs after.
 * Returns the number of token records removed.
 */
async function pruneDeadTokens(db, uid, tokens, results) {
    var _a;
    const dead = new Set(selectDeadTokens(tokens, results));
    if (dead.size === 0)
        return 0;
    try {
        const userRef = db.collection('users').doc(uid);
        const [tokenSnap, userDoc] = await Promise.all([
            userRef.collection('fcmTokens').get(),
            userRef.get(),
        ]);
        const batch = db.batch();
        let removed = 0;
        tokenSnap.docs.forEach((d) => {
            var _a;
            const t = (_a = d.data()) === null || _a === void 0 ? void 0 : _a.token;
            if (typeof t === 'string' && dead.has(t)) {
                batch.delete(d.ref);
                removed++;
            }
        });
        const legacy = (_a = userDoc.data()) === null || _a === void 0 ? void 0 : _a.fcmToken;
        if (typeof legacy === 'string' && dead.has(legacy)) {
            batch.update(userRef, { fcmToken: admin.firestore.FieldValue.delete() });
            removed++;
        }
        if (removed > 0) {
            await batch.commit();
            console.log(`[pruneDeadTokens] uid=${uid} removed ${removed} dead token(s)`);
        }
        return removed;
    }
    catch (e) {
        console.warn(`[pruneDeadTokens] uid=${uid} prune failed (ignored):`, e);
        return 0;
    }
}
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