refactor: history processing

1. fixes issue when some chats/messages are not synced
2. adds info about whether the history chunk is the latest

src/Utils/history.ts

@@ -1,7 +1,8 @@
-import { downloadContentFromMessage } from "./messages-media";
-import { proto } from "../../WAProto";
+import { downloadContentFromMessage } from "./messages-media"
+import { proto } from "../../WAProto"
 import { promisify } from 'util'
-import { inflate } from "zlib";
+import { inflate } from "zlib"
+import { Chat, Contact } from "../Types"
 
 const inflatePromise = promisify(inflate)
 
@@ -16,4 +17,66 @@ export const downloadHistory = async(msg: proto.IHistorySyncNotification) => {
 
 	const syncData = proto.HistorySync.decode(buffer)
 	return syncData
+}
+
+export const processHistoryMessage = (item: proto.IHistorySync, historyCache: Set<string>) => {
+	const isLatest = historyCache.size === 0
+	const messages: proto.IWebMessageInfo[] = []
+	const contacts: Contact[] = []
+	const chats: Chat[] = []
+	switch(item.syncType) {
+		case proto.HistorySync.HistorySyncHistorySyncType.INITIAL_BOOTSTRAP:
+		case proto.HistorySync.HistorySyncHistorySyncType.RECENT:
+			for(const chat of item.conversations) {
+				const contactId = `c:${chat.id}`
+				if(chat.name && !historyCache.has(contactId)) {
+					contacts.push({
+						id: chat.id,
+						name: chat.name
+					})
+					historyCache.add(contactId)
+				}
+
+				for(const { message } of chat.messages || []) {
+					const uqId = `${message?.key.remoteJid}:${message.key.id}`
+					if(message && !historyCache.has(uqId)) {
+						messages.push(message)
+						historyCache.add(uqId)
+					}
+				}
+
+				delete chat.messages
+				if(!historyCache.has(chat.id)) {
+					chats.push(chat)
+					historyCache.add(chat.id)
+				}
+			}
+		break
+		case proto.HistorySync.HistorySyncHistorySyncType.PUSH_NAME:
+			for(const c of item.pushnames) {
+				const contactId = `c:${c.id}`
+				if(historyCache.has(contactId)) {
+					contacts.push({ notify: c.pushname, id: c.id })
+					historyCache.add(contactId)
+				}
+			}
+		break
+		case proto.HistorySync.HistorySyncHistorySyncType.INITIAL_STATUS_V3:
+			// TODO
+		break
+	}
+
+	if(chats.length || contacts.length || messages.length) {
+		return {
+			chats,
+			contacts,
+			messages,
+			isLatest,
+		}
+	}
+}
+
+export const downloadAndProcessHistorySyncNotification = async(msg: proto.IHistorySyncNotification, historyCache: Set<string>) => {
+	const historyMsg = await downloadHistory(msg)
+	return processHistoryMessage(historyMsg, historyCache)
 }