Add pagination to message screen.

js/db.js

@@ -30,6 +30,7 @@ function openDb() {
         msgStore = db.createObjectStore("messages", { keyPath: "id" });
         msgStore.createIndex("from", "from", { unique: false });
         msgStore.createIndex("fingerprint", ["from", "timestamp"], { unique: false });
+        msgStore.createIndex("cidTimestampId", ["chatId", "timestamp", "id"], { unique: false });
       } else {
         msgStore = tx.objectStore("messages");
       }
@@ -172,6 +173,39 @@ export async function loadLatestMessages(chatId, limit = 50) {
   });
 }
 
+export async function loadOlderMessages(chatId, oldestTimestamp, oldestId, limit = 50) {
+  const db = await openDb();
+
+  return new Promise((resolve, reject) => {
+    const tx = db.transaction("messages", "readonly");
+    const store = tx.objectStore("messages");
+    const idx = store.index("cidTimestampId");
+
+    const out = [];
+
+    const parsedTimestamp = isNaN(oldestTimestamp) ? oldestTimestamp : Number(oldestTimestamp);
+
+    const range = IDBKeyRange.bound(
+      [chatId, -Infinity, ""],
+      [chatId, parsedTimestamp, oldestId],
+      false,
+      false
+    );
+
+    idx.openCursor(range, "prev").onsuccess = (e) => {
+      const cursor = e.target.result;
+      if (!cursor) return resolve(out);
+
+      out.push(cursor.value);
+
+      if (out.length >= limit) resolve(out);
+      else cursor.continue();
+    };
+
+    tx.onerror = () => reject(tx.error);
+  });
+}
+
 export async function upsertMedia(reqId, blob, filename) {
   const db = await openDb();
 

js/storage.js

@@ -1,4 +1,4 @@
-import { loadChatsSorted, loadLatestMessages, loadMedia, upsertChats, upsertMedia, upsertMessages } from "./db.js";
+import { loadChatsSorted, loadLatestMessages, loadMedia, loadOlderMessages, upsertChats, upsertMedia, upsertMessages } from "./db.js";
 import { waha } from "./waha.js";
 
 let online = false;
@@ -107,6 +107,14 @@ export async function getChatMessages(chatId) {
   }
 }
 
+export async function getMoreChatMessages(chatId, oldestTimestamp, oldestId, limit = 50) {
+  if (online) {
+    return waha.getChatMessages(chatId, oldestTimestamp);
+  } else {
+    return await loadOlderMessages(chatId, oldestTimestamp, oldestId);
+  }
+}
+
 export async function getChatPicture(chatId) {
   if (online) {
     return await waha.getChatPicture(chatId);

js/ui.js

@@ -1,7 +1,7 @@
 import { formatTime } from "./utils.js";
 import { waha } from "./waha.js";
 import { config } from "./config.js";
-import { getChatPicture, getMessage, getMedia } from "./storage.js";
+import { getChatPicture, getMessage, getMedia, getMoreChatMessages } from "./storage.js";
 
 export const elements = {
     chatList: document.getElementById('chat-list'),
@@ -136,19 +136,48 @@ export const ui = {
             elements.messagesContainer.innerHTML = '<div class="loading-chats">No messages. Say hello!</div>';
             return;
         }
+
+        const loadMore = document.createElement("button");
+        loadMore.classList.add("load-more-btn");
+        loadMore.innerText = "Load more";
+        loadMore.addEventListener('click', () => {
+            this.loadMoreMessages(chatId, userID);
+        });
+        elements.messagesContainer.appendChild(loadMore);
         
         for (const msg of messages) {
-            this.appendSingleMessage(msg, activeChatName, userID, chatId);
+            this.appendSingleMessage(msg, userID, chatId);
         }
         
         this.scrollToBottom();
     },
+
+    async loadMoreMessages(chatId, userId) {
+        const oldest = document.querySelector('.message-group:first-of-type');
+        const oldestTimestamp = oldest.dataset.timestamp;
+        const oldestId = oldest.id;
+        console.log(oldest)
+        console.log(oldestId)
+        console.log(oldestTimestamp)
+
+        const loadMoreButton = document.querySelector('.load-more-btn');
+        loadMoreButton.removeEventListener('click', this.loadMoreMessages);
+
+        const msgs = await getMoreChatMessages(chatId, oldestTimestamp, oldestId);
+        msgs.shift();
+        
+        msgs.forEach(async msg => {
+            loadMoreButton.after(this.generateMessage(msg, userId, chatId));
+        });
+
+        loadMoreButton.addEventListener('click', this.loadMoreMessages);
+    },
     
     /**
     * Append a single message (used for optimistic updates immediately upon sending)
     */
-    appendSingleMessage(msg, activeChatName, userID, chatId, isLocal = false) {
-        elements.messagesContainer.appendChild(this.generateMessage(msg, activeChatName, userID, chatId, isLocal))
+    appendSingleMessage(msg, userID, chatId, isLocal = false) {
+        elements.messagesContainer.appendChild(this.generateMessage(msg, userID, chatId, isLocal))
     },
     
     generateTempMessageLink(msg) {
@@ -169,7 +198,7 @@ export const ui = {
         return a;
     },
     
-    generateMessage(msg, activeChatName, userID, chatId, isLocal = false) {
+    generateMessage(msg, userID, chatId, isLocal = false) {
         const isOutgoing = msg.fromMe || msg.sender === 'me';
         
         function getPrevMessageElem() {
@@ -181,6 +210,7 @@ export const ui = {
         const groupDiv = document.createElement('div');
         groupDiv.className = `message-group ${isOutgoing ? 'outgoing' : 'incoming'}`;
         groupDiv.id = msg.id;
+        groupDiv.dataset.timestamp = msg.timestamp;
         groupDiv.dataset.from = msg.participant || msg.from;
         
         const senderName = isOutgoing ? userID : (msg._data.notifyName || msg.from);

js/waha.js

@@ -69,7 +69,7 @@ async function downloadFile(path, options = {}) {
 
 export const waha = {
     async getVersion() {
-        return request('/api/version');
+        return await request('/api/version');
     },
 
     async getChats() {
@@ -89,8 +89,9 @@ export const waha = {
         });
     },
 
-    async getChatMessages(chatId) {
-        return request(`/api/${config.session}/chats/${chatId}/messages?downloadMedia=false&limit=40`);
+    async getChatMessages(chatId, beforeTimestamp) {
+        console.log(`/api/${config.session}/chats/${chatId}/messages?downloadMedia=false&limit=40&sortBy=timestamp${beforeTimestamp ? `&filter.timestamp.gte=${beforeTimestamp}` : "" }`);
+        return request(`/api/${config.session}/chats/${chatId}/messages?downloadMedia=false&limit=40${beforeTimestamp ? `&filter.timestamp.lte=${beforeTimestamp}` : "" }`);
     },
 
     async getSingleChatMessage(chatId, messageId, downladMedia) {