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* Conversation routes - private messaging.
*
* GET /api/conversations/:id/messages -> Get conversation messages
* POST /api/conversations/:id/messages -> Send message (with FCM push + RTDB broadcast)
*/
const router = require('express').Router();
const { db, rtdb, FieldValue } = require('../utils/firebase');
const { generateId, now } = require('../utils/helpers');
const { sendFcmToTokens, cleanupInvalidTokens } = require('../utils/fcm');
const log = require('../utils/log');
const DEFAULT_MESSAGE_LIMIT = 50;
const MAX_MESSAGE_LIMIT = 200;
const MAX_TEXT_LENGTH = 2000;
const MAX_IMAGES_PER_MESSAGE = 10;
const MAX_SENDER_NAME_LENGTH = 50;
const VALID_MESSAGE_TYPES = ['TEXT', 'IMAGE', 'STICKER', 'ROOM_INVITE', 'MOD_ACTION'];
/**
* Build a plain message object from a Firestore message doc.
*/
function buildMessage(doc) {
return {
id: doc.id,
messageId: doc.id,
senderId: doc.senderId || '',
senderName: doc.senderName || '',
text: doc.text || '',
imageUrls: doc.imageUrls || [],
type: doc.type || 'TEXT',
createdAt: doc.createdAt || 0,
editedAt: doc.editedAt || null,
editCount: doc.editCount || 0,
replyToMessageId: doc.replyToId || doc.replyToMessageId || null,
replyToText: doc.replyToText || null,
replyToSenderName: doc.replyToSenderName || null,
stickerUrl: doc.stickerUrl || null,
roomInviteId: doc.roomInviteId || null,
roomInviteName: doc.roomInviteName || null,
reactions: doc.reactions || {},
isRecalled: !!doc.isRecalled,
isHidden: !!doc.isHidden,
hiddenBy: doc.hiddenBy || null,
};
}
/** Check if the current time falls within a user's DND schedule. */
function isInDndPeriod(user) {
if (!user.dndEnabled) return false;
const utcNow = new Date();
const currentMinutes = utcNow.getUTCHours() * 60 + utcNow.getUTCMinutes();
const dndStart = (user.dndStartHour || 0) * 60 + (user.dndStartMinute || 0);
const dndEnd = (user.dndEndHour || 0) * 60 + (user.dndEndMinute || 0);
if (dndStart <= dndEnd) {
return currentMinutes >= dndStart && currentMinutes < dndEnd;
}
return currentMinutes >= dndStart || currentMinutes < dndEnd;
}
/** Determine if a recipient should receive a notification. */
function shouldNotifyRecipient(user, settings) {
if (!user) return false;
if (user.pmNotificationsEnabled === false) return false;
if (isInDndPeriod(user)) return false;
if (settings?.isMuted) return false;
if (!user.fcmTokens || user.fcmTokens.length === 0) return false;
return true;
}
/**
* Send FCM push notifications to conversation participants (except sender).
* Uses batch Firestore reads to minimize read cost.
*/
async function sendMessageNotifications(
conversationId,
senderId,
senderName,
previewText,
type,
recipients,
isGroup,
groupName,
) {
try {
Iif (recipients.length === 0) return;
const userRefs = recipients.map((p) => db.doc(`users/${p.userId}`));
const settingsRefs = recipients.map((p) =>
db.doc(`conversations/${conversationId}/userSettings/${p.userId}`),
);
const [userSnaps, settingsSnaps] = await Promise.all([
db.getAll(...userRefs),
db.getAll(...settingsRefs),
]);
const usersById = {};
for (const snap of userSnaps) {
if (snap.exists) usersById[snap.id] = snap.data();
}
const settingsById = {};
for (const snap of settingsSnaps) {
if (snap.exists) settingsById[snap.id] = snap.data();
}
for (const p of recipients) {
const recipientId = p.userId;
const user = usersById[recipientId];
const settings = settingsById[recipientId];
if (!shouldNotifyRecipient(user, settings)) continue;
const showPreview = user.pmNotificationPreview !== false;
const data = {
type: 'PM',
senderId,
senderName: isGroup ? `${senderName} (${groupName || 'Group'})` : senderName,
messageText: showPreview ? previewText : 'New message',
conversationId,
isGroup: String(isGroup),
showPreview: String(showPreview),
};
const invalidTokens = await sendFcmToTokens(user.fcmTokens, data);
if (invalidTokens.length > 0) {
await cleanupInvalidTokens(invalidTokens, recipientId);
}
}
} catch (err) {
log.error('conversations', 'Failed to send message notifications', {
conversationId,
error: err.message,
});
}
}
/** Broadcast a conversation event via RTDB. */
async function broadcastToConversation(conversationId, data) {
try {
await rtdb.ref(`conversations/${conversationId}/events/lastEvent`).set({
type: data.type,
ts: Date.now(),
});
} catch (err) {
log.error('conversations', 'Failed to write RTDB event', {
conversationId,
error: err.message,
});
}
}
// -- Get messages --
router.get('/conversations/:id/messages', async (req, res) => {
try {
// Verify the requester is a participant
const convSnap = await db.doc(`conversations/${req.params.id}`).get();
if (!convSnap.exists) return res.status(404).json({ error: 'Conversation not found' });
const participantIds = convSnap.data().participantIds || [];
if (!participantIds.includes(req.auth.uniqueId)) {
return res.status(403).json({ error: 'Not a participant of this conversation' });
}
const limit = Math.min(
Number.parseInt(req.query.limit, 10) || DEFAULT_MESSAGE_LIMIT,
MAX_MESSAGE_LIMIT,
);
const snap = await db
.collection(`conversations/${req.params.id}/messages`)
.orderBy('createdAt', 'desc')
.limit(limit)
.get();
const messages = snap.docs.map((d) => ({ id: d.id, ...d.data() }));
// Return in chronological order (oldest first)
return res.json(messages.toReversed().map(buildMessage));
} catch (err) {
log.error('conversations', 'Failed to fetch messages', {
conversationId: req.params.id,
error: err.message,
});
return res.status(500).json({ error: 'Internal server error' });
}
});
// -- Send message --
router.post('/conversations/:id/messages', async (req, res) => {
try {
const uniqueId = req.auth.uniqueId;
const body = req.body;
if (!body) return res.status(400).json({ error: 'Invalid body' });
const conversationId = req.params.id;
const messageId = generateId();
const timestamp = now();
const type = body.type || 'TEXT';
const senderId = uniqueId;
const senderName = (body.senderName || '').slice(0, MAX_SENDER_NAME_LENGTH);
const text = (body.text || '').slice(0, MAX_TEXT_LENGTH);
// Validate message type
if (!VALID_MESSAGE_TYPES.includes(type)) {
return res.status(400).json({ error: 'Invalid message type' });
}
// Validate imageUrls count
const imageUrls = Array.isArray(body.imageUrls)
? body.imageUrls.slice(0, MAX_IMAGES_PER_MESSAGE)
: [];
log.info('conversations', 'Sending message', { conversationId, senderId, type });
// Build preview text for lastMessage
let previewText = text;
if (type === 'IMAGE') previewText = '[Image]';
else if (type === 'STICKER') previewText = '[Sticker]';
else if (type === 'ROOM_INVITE') previewText = '[Room Invite]';
// Read conversation to get participant list and group info
const convSnap = await db.doc(`conversations/${conversationId}`).get();
if (!convSnap.exists) return res.status(404).json({ error: 'Conversation not found' });
const convDoc = convSnap.data();
if (!convDoc) return res.status(500).json({ error: 'Corrupted conversation data' });
const participantIds = convDoc.participantIds || [];
if (!participantIds.includes(senderId)) {
return res.status(403).json({ error: 'Not a participant of this conversation' });
}
const recipientIds = participantIds.filter((pid) => pid !== senderId);
const isGroup = !!convDoc.isGroup;
const groupName = convDoc.groupName || null;
const msgData = {
senderId,
senderName,
text,
type,
imageUrls,
stickerUrl: body.stickerUrl || null,
roomInviteId: body.roomInviteId || null,
roomInviteName: body.roomInviteName || null,
replyToId: body.replyToMessageId || null,
replyToText: body.replyToText || null,
replyToSenderName: body.replyToSenderName || null,
reactions: {},
isRecalled: false,
isHidden: false,
hiddenBy: null,
editCount: 0,
editedAt: null,
createdAt: timestamp,
};
// Batch: write message + update conversation lastMessage + increment unread counts
const lastMessage = { text: previewText, senderId, senderName, type, createdAt: timestamp };
const batch = db.batch();
batch.set(db.doc(`conversations/${conversationId}/messages/${messageId}`), msgData);
batch.set(
db.doc(`conversations/${conversationId}`),
{
lastMessage,
lastMessageAt: timestamp,
},
{ merge: true },
);
// Increment unread counts for all recipients (set+merge in case doc doesn't exist yet)
for (const pid of recipientIds) {
batch.set(
db.doc(`conversations/${conversationId}/userSettings/${pid}`),
{
unreadCount: FieldValue.increment(1),
},
{ merge: true },
);
}
await batch.commit();
// Un-hide conversation for all recipients (fire-and-forget)
Promise.all(
recipientIds.map((pid) =>
db
.doc(`conversations/${conversationId}/userSettings/${pid}`)
.set({ isHidden: false }, { merge: true }),
),
).catch((err) =>
log.error('conversations', 'Failed to un-hide for recipients', {
conversationId,
error: err.message,
}),
);
// FCM notifications + RTDB broadcast (fire-and-forget)
const recipients = recipientIds.map((id) => ({ userId: id }));
sendMessageNotifications(
conversationId,
senderId,
senderName,
previewText,
type,
recipients,
isGroup,
groupName,
).catch((err) =>
log.error('conversations', 'Failed to send notifications', {
conversationId,
error: err.message,
}),
);
broadcastToConversation(conversationId, { type: 'new_message' }).catch((err) =>
log.error('conversations', 'Failed to broadcast event', {
conversationId,
error: err.message,
}),
);
return res.json(
buildMessage({ id: messageId, ...msgData, replyToMessageId: msgData.replyToId }),
);
} catch (err) {
log.error('conversations', 'Failed to send message', {
conversationId: req.params.id,
senderId: req.auth?.uniqueId,
error: err.message,
});
return res.status(500).json({ error: 'Internal server error' });
}
});
module.exports = router;
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