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Dockerfile

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+# Dockerfile
+# Use an official Node.js runtime as the base image
+FROM node:22.1.0
+
+WORKDIR /usr/src/app
+
+# Copy only package files first for better layer caching
+# Use 1000:1000 for non-root user/group typically used in these images
+COPY --chown=1000:1000 package.json package-lock.json ./
+
+# Install production dependencies only
+RUN npm install --production --ignore-scripts
+
+# Copy the rest of the application files
+# This includes app.js, public/index.html, data/users.json (initially empty if not existing)
+COPY --chown=1000:1000 . .
+
+# Expose the port Hugging Face expects (usually 7860)
+EXPOSE 7860
+
+# Ensure the app runs as non-root user (good practice)
+USER 1000
+
+# Start the application using the start script from package.json
+CMD ["npm", "start"]

app.js

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+// --- START: Additions/Modifications in app.js ---
+
+const express = require('express');
+const http = require('http');
+const socketIo = require('socket.io');
+const path = require('path');
+const fs = require('fs').promises; // Use promise-based fs
+// const bcrypt = require('bcrypt'); // Still commented out, needed for secure apps
+
+// Create express app and server
+const app = express();
+const server = http.createServer(app);
+const io = socketIo(server);
+
+// --- Configuration ---
+const PUBLIC_DIR = path.join(__dirname, 'public');
+const DATA_DIR = path.join(__dirname, 'data'); // Directory for data files
+const USERS_FILE_PATH = path.join(DATA_DIR, 'users.json'); // Path to users file
+
+// Serve static files from the 'public' directory
+app.use(express.static(PUBLIC_DIR));
+
+// --- State ---
+let registeredUsers = {}; // Will be loaded from file
+// onlineUsers structure: { socketId: { username, isTyping, inCallWith: null | string (socketId) } }
+const onlineUsers = {};
+const usernameToSocketId = {}; // Helper map: { username: socketId }
+
+// --- File Helper Functions (loadUsers, saveUsers - remain the same) ---
+// ... (Keep existing loadUsers and saveUsers functions) ...
+
+async function loadUsers() {
+    try {
+        await fs.mkdir(DATA_DIR, { recursive: true });
+        const data = await fs.readFile(USERS_FILE_PATH, 'utf8');
+        return JSON.parse(data);
+    } catch (error) {
+        if (error.code === 'ENOENT') {
+            console.log('users.json not found, starting with empty user list.');
+            return {};
+        } else if (error instanceof SyntaxError) {
+            console.error('Error parsing users.json:', error);
+            return {};
+        } else {
+            console.error('Error loading users.json:', error);
+            return {};
+        }
+    }
+}
+
+async function saveUsers(usersData) {
+    try {
+        await fs.mkdir(DATA_DIR, { recursive: true });
+        const data = JSON.stringify(usersData, null, 2);
+        await fs.writeFile(USERS_FILE_PATH, data, 'utf8');
+        console.log('User data saved to users.json');
+    } catch (error) {
+        console.error('Error saving users.json:', error);
+    }
+}
+
+
+// --- Socket.IO Logic ---
+io.on('connection', (socket) => {
+    console.log('A user connected:', socket.id);
+    // Note: currentUsername is only valid *after* successful login within this closure.
+    // Use onlineUsers[socket.id]?.username safely elsewhere.
+
+    // --- Handle Login/Registration Attempt (Modified to track usernameToSocketId) ---
+    socket.on('attempt_login', async (credentials) => {
+        if (!credentials || !credentials.username || !credentials.password) {
+            socket.emit('login_fail', 'Username and password are required.');
+            return;
+        }
+
+        const { username, password } = credentials;
+
+        const isAlreadyOnline = usernameToSocketId[username]; // Check map directly
+        if (isAlreadyOnline) {
+            socket.emit('login_fail', `User "${username}" is already logged in.`);
+            return;
+        }
+
+        if (registeredUsers.hasOwnProperty(username)) {
+            if (registeredUsers[username] === password) { // INSECURE
+                console.log(`Login success: ${username} (${socket.id})`);
+                loginUser(socket, username);
+            } else {
+                console.log(`Login fail: Invalid password for ${username} (${socket.id})`);
+                socket.emit('login_fail', 'Invalid username or password.');
+            }
+        } else {
+            console.log(`Registering new user: ${username} (${socket.id})`);
+            registeredUsers[username] = password; // INSECURE
+            await saveUsers(registeredUsers);
+            loginUser(socket, username);
+        }
+    });
+
+    // Modified loginUser to update maps and state
+    function loginUser(socketInstance, username) {
+        // Store user info
+        onlineUsers[socketInstance.id] = {
+            username: username,
+            isTyping: false,
+            inCallWith: null // Initially not in a call
+        };
+        usernameToSocketId[username] = socketInstance.id; // Add to lookup map
+
+        socketInstance.emit('login_success', username);
+        io.emit('user_join', username);
+        io.emit('user_list', getUsersPublicInfo());
+    }
+
+    // --- Message Handling (remains the same) ---
+    socket.on('message', (data) => {
+        const senderInfo = onlineUsers[socket.id];
+        if (!senderInfo || !data || !data.text) return;
+
+        if (senderInfo.isTyping) {
+            senderInfo.isTyping = false;
+            // Don't need to exclude sender ID here as getUsersTyping doesn't include self by default logic
+            socket.broadcast.emit('user_typing_status', getUsersTyping());
+        }
+
+        io.emit('message', {
+            username: senderInfo.username,
+            text: data.text,
+            timestamp: new Date().toISOString() // Use ISO string for consistency
+        });
+    });
+
+    // --- Typing Indicator Handling (remains the same) ---
+    socket.on('typing', () => {
+        const userInfo = onlineUsers[socket.id];
+        if (userInfo && !userInfo.isTyping) {
+            userInfo.isTyping = true;
+            socket.broadcast.emit('user_typing_status', getUsersTyping(socket.id)); // Exclude self
+        }
+    });
+
+    socket.on('stop_typing', () => {
+        const userInfo = onlineUsers[socket.id];
+        if (userInfo && userInfo.isTyping) {
+            userInfo.isTyping = false;
+            socket.broadcast.emit('user_typing_status', getUsersTyping(socket.id)); // Exclude self
+        }
+    });
+
+    // --- Disconnect Handling (Modified to handle calls and maps) ---
+    socket.on('disconnect', () => {
+        const userInfo = onlineUsers[socket.id];
+        if (userInfo) {
+            const username = userInfo.username;
+            const userInCallWithSocketId = userInfo.inCallWith;
+
+            console.log(`${username} (${socket.id}) disconnected`);
+
+            // --- Hang up any active call ---
+            if (userInCallWithSocketId && onlineUsers[userInCallWithSocketId]) {
+                console.log(`Disconnect: Hanging up call between ${username} and ${onlineUsers[userInCallWithSocketId].username}`);
+                io.to(userInCallWithSocketId).emit('call-ended'); // Notify the other user
+                onlineUsers[userInCallWithSocketId].inCallWith = null; // Clear call state for the other user
+            }
+            // --- End hang up ---
+
+            delete onlineUsers[socket.id];          // Remove from online list
+            delete usernameToSocketId[username];    // Remove from lookup map
+
+            socket.broadcast.emit('user_leave', username);
+            io.emit('user_list', getUsersPublicInfo()); // Send updated list
+            // Update typing status if the disconnected user was typing
+            if (userInfo.isTyping) {
+                socket.broadcast.emit('user_typing_status', getUsersTyping());
+            }
+        } else {
+            console.log('User disconnected before login:', socket.id);
+        }
+    });
+
+
+    // --- START: WebRTC Signaling Handlers ---
+
+    /**
+     * Initiates a call request from caller to target.
+     * data: { targetUsername: string }
+     */
+    socket.on('request-call', (data) => {
+        const callerInfo = onlineUsers[socket.id];
+        if (!callerInfo) return; // Should not happen if logged in
+
+        const targetUsername = data.targetUsername;
+        const targetSocketId = usernameToSocketId[targetUsername];
+        const targetInfo = targetSocketId ? onlineUsers[targetSocketId] : null;
+
+        console.log(`Call request from ${callerInfo.username} (${socket.id}) to ${targetUsername}`);
+
+        if (!targetInfo) {
+            console.log(`Call target ${targetUsername} not found or offline.`);
+            socket.emit('call-denied', { reason: 'User is offline.' });
+            return;
+        }
+
+        if (targetInfo.inCallWith) {
+            console.log(`Call target ${targetUsername} is already in a call.`);
+            socket.emit('call-denied', { reason: `${targetUsername} is busy.` });
+            return;
+        }
+
+        if (callerInfo.inCallWith) {
+             console.log(`Caller ${callerInfo.username} is already in a call.`);
+             socket.emit('call-denied', { reason: `You are already in a call.` });
+             return;
+        }
+
+        // Send call offer prompt to the target user
+        console.log(`Sending incoming call notification to ${targetUsername} (${targetSocketId})`);
+        io.to(targetSocketId).emit('incoming-call', {
+            callerUsername: callerInfo.username
+        });
+    });
+
+     /**
+     * Target user accepts the call.
+     * data: { callerUsername: string }
+     */
+    socket.on('accept-call', (data) => {
+        const acceptorInfo = onlineUsers[socket.id]; // The user accepting the call
+        if (!acceptorInfo) return;
+
+        const callerUsername = data.callerUsername;
+        const callerSocketId = usernameToSocketId[callerUsername];
+        const callerInfo = callerSocketId ? onlineUsers[callerSocketId] : null;
+
+        console.log(`${acceptorInfo.username} accepted call from ${callerUsername}`);
+
+        if (!callerInfo) {
+            console.log(`Original caller ${callerUsername} not found.`);
+            socket.emit('call-denied', { reason: 'Caller went offline.' });
+            return;
+        }
+
+        if (callerInfo.inCallWith || acceptorInfo.inCallWith) {
+             console.log(`Call conflict: ${callerUsername} or ${acceptorInfo.username} already in call.`);
+             // Notify both potential parties that call cannot proceed
+             socket.emit('call-denied', { reason: 'Call conflict or one party is busy.' });
+             io.to(callerSocketId).emit('call-denied', { reason: 'Call conflict or the other party became busy.'});
+             return;
+        }
+
+        // Mark both users as in call with each other
+        acceptorInfo.inCallWith = callerSocketId;
+        callerInfo.inCallWith = socket.id; // socket.id is the acceptor's socket id
+
+        // Notify the original caller to start the WebRTC offer process
+        io.to(callerSocketId).emit('call-accepted', {
+            acceptorUsername: acceptorInfo.username
+        });
+
+        // Notify the acceptor to wait for the offer
+        socket.emit('prepare-for-offer', {
+             callerUsername: callerInfo.username
+        });
+
+        console.log(`Call established between ${callerUsername} (${callerSocketId}) and ${acceptorInfo.username} (${socket.id})`);
+    });
+
+
+     /**
+     * Target user rejects the call.
+     * data: { callerUsername: string }
+     */
+    socket.on('reject-call', (data) => {
+        const rejectorInfo = onlineUsers[socket.id];
+        if (!rejectorInfo) return;
+
+        const callerUsername = data.callerUsername;
+        const callerSocketId = usernameToSocketId[callerUsername];
+
+        console.log(`${rejectorInfo.username} rejected call from ${callerUsername}`);
+
+        if (callerSocketId) {
+            io.to(callerSocketId).emit('call-rejected', {
+                rejectorUsername: rejectorInfo.username
+            });
+        }
+    });
+
+    /**
+     * Relays the WebRTC Offer from caller to acceptor.
+     * data: { targetUsername: string, offer: RTCSessionDescriptionInit }
+     */
+    socket.on('webrtc-offer', (data) => {
+        const callerInfo = onlineUsers[socket.id];
+        if (!callerInfo) return;
+
+        const targetUsername = data.targetUsername;
+        const targetSocketId = usernameToSocketId[targetUsername];
+
+        if (targetSocketId && onlineUsers[targetSocketId]?.inCallWith === socket.id) {
+             console.log(`Relaying WebRTC offer from ${callerInfo.username} to ${targetUsername}`);
+             io.to(targetSocketId).emit('webrtc-offer', {
+                 offer: data.offer,
+                 callerUsername: callerInfo.username // Send caller username with the offer
+             });
+        } else {
+            console.warn(`WebRTC Offer: Target ${targetUsername} not found or not in call with ${callerInfo.username}`);
+        }
+    });
+
+    /**
+     * Relays the WebRTC Answer from acceptor to caller.
+     * data: { targetUsername: string (original caller), answer: RTCSessionDescriptionInit }
+     */
+    socket.on('webrtc-answer', (data) => {
+        const acceptorInfo = onlineUsers[socket.id];
+        if (!acceptorInfo) return;
+
+        const targetUsername = data.targetUsername; // This is the original caller
+        const targetSocketId = usernameToSocketId[targetUsername];
+
+        if (targetSocketId && onlineUsers[targetSocketId]?.inCallWith === socket.id) {
+             console.log(`Relaying WebRTC answer from ${acceptorInfo.username} to ${targetUsername}`);
+             io.to(targetSocketId).emit('webrtc-answer', {
+                 answer: data.answer,
+                 acceptorUsername: acceptorInfo.username // Send acceptor username with the answer
+             });
+        } else {
+             console.warn(`WebRTC Answer: Target ${targetUsername} not found or not in call with ${acceptorInfo.username}`);
+        }
+    });
+
+    /**
+     * Relays ICE Candidates between peers.
+     * data: { targetUsername: string, candidate: RTCIceCandidateInit }
+     */
+    socket.on('webrtc-ice-candidate', (data) => {
+        const senderInfo = onlineUsers[socket.id];
+        if (!senderInfo) return;
+
+        const targetUsername = data.targetUsername;
+        const targetSocketId = usernameToSocketId[targetUsername];
+
+        // Check if the target is actually the one sender is in call with
+        if (targetSocketId && senderInfo.inCallWith === targetSocketId) {
+            // console.log(`Relaying ICE candidate from ${senderInfo.username} to ${targetUsername}`); // Too noisy
+            io.to(targetSocketId).emit('webrtc-ice-candidate', {
+                candidate: data.candidate
+            });
+        } else {
+             // console.warn(`ICE Candidate: Target ${targetUsername} not found or sender ${senderInfo.username} not in call with them.`);
+        }
+    });
+
+    /**
+     * Handles user explicitly hanging up the call.
+     * data: {} (might include target if needed, but server knows from inCallWith)
+     */
+    socket.on('hangup-call', () => {
+        const userInfo = onlineUsers[socket.id];
+        if (!userInfo || !userInfo.inCallWith) {
+            // Not in a call, nothing to hang up
+            return;
+        }
+
+        const targetSocketId = userInfo.inCallWith;
+        const targetInfo = onlineUsers[targetSocketId];
+
+        console.log(`${userInfo.username} is hanging up call with ${targetInfo?.username || 'unknown'}`);
+
+        // Notify the other user
+        if (targetInfo) {
+            io.to(targetSocketId).emit('call-ended');
+            targetInfo.inCallWith = null; // Clear target's call state
+        }
+
+        // Clear caller's call state
+        userInfo.inCallWith = null;
+
+        // Optional: send confirmation back to the hanger-upper
+        socket.emit('call-ended');
+    });
+
+    // --- END: WebRTC Signaling Handlers ---
+
+});
+
+// --- Helper Functions (Modified getUsersTyping) ---
+function getUsersPublicInfo() {
+    // Return username and potentially busy status? For now just usernames.
+    return Object.values(onlineUsers).map(u => u.username);
+}
+
+// Modified to exclude the caller from the list sent back to them
+function getUsersTyping(excludeSocketId = null) {
+    return Object.entries(onlineUsers)
+                 .filter(([id, user]) => id !== excludeSocketId && user.isTyping)
+                 .map(([id, user]) => user.username);
+}
+
+// --- Find Local IP (remains the same) ---
+function getLocalIp() {
+    // ... (Keep existing getLocalIp function) ...
+     const { networkInterfaces } = require('os');
+     const nets = networkInterfaces();
+     for (const name of Object.keys(nets)) {
+         for (const net of nets[name]) {
+             if (net.family === 'IPv4' && !net.internal) {
+                 return net.address;
+             }
+         }
+     }
+     return '127.0.0.1';
+}
+const localIp = getLocalIp();
+
+// --- Start Server (IIFE remains the same) ---
+(async () => {
+    registeredUsers = await loadUsers();
+    console.log(`Loaded ${Object.keys(registeredUsers).length} registered users.`);
+
+    // const PORT = process.env.PORT || 3000; // Find this line or similar
+const PORT = process.env.PORT || 7860; // Change 3000 to 7860
+    server.listen(PORT, () => {
+        console.log(`Server running on port ${PORT}`);
+        console.log(`Access it locally at: http://localhost:${PORT}`);
+        if (localIp !== '127.0.0.1') {
+            console.log(`Access on local network (e.g., mobile): http://${localIp}:${PORT}`);
+        }
+        console.log(`Serving files from: ${PUBLIC_DIR}`);
+        console.log(`User data file: ${USERS_FILE_PATH}`);
+        console.warn('--- SECURITY WARNING: Storing plain text passwords in users.json! ---');
+        console.warn('--- WebRTC Note: Using public STUN servers. TURN server might be needed for reliability. ---');
+    });
+
+    server.on('error', (error) => {
+        console.error('Server failed to start:', error);
+        process.exit(1);
+    });
+})();
+
+// --- END: Additions/Modifications in app.js ---

data/users.json

@@ -0,0 +1,5 @@
+{
+  "pc": "123",
+  "mobile": "123",
+  "pc2": "123"
+}

package-lock.json

@@ -0,0 +1,1032 @@
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+  "name": "chat-app",
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+  "requires": true,
+  "packages": {
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+      "name": "chat-app",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
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+        "socket.io": "^4.8.1"
+      }
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+        "qs": "^6.14.0",
+        "raw-body": "^3.0.0",
+        "type-is": "^2.0.0"
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+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
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+}

package.json

@@ -0,0 +1,16 @@
+{
+  "name": "chat-app",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^5.1.0",
+    "socket.io": "^4.8.1"
+  }
+}

public/index.html

@@ -0,0 +1,1382 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>WhatsApp Style Chat + Video</title>
+    <!-- Include Emoji Picker library -->
+    <script type="module" src="https://cdn.jsdelivr.net/npm/emoji-picker-element@^1/index.js"></script>
+    <style>
+        /* Basic Reset & Body Styling */
+        * { box-sizing: border-box; margin: 0; padding: 0; }
+        html, body { height: 100%; overflow: hidden; } /* Prevent scrolling */
+        body {
+            font-family: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
+            background-color: #DADBD3; /* WhatsApp Web-like background */
+            display: flex;
+            justify-content: center;
+            align-items: center;
+            position: relative; /* Needed for absolute positioning of call container */
+        }
+
+        /* Container to hold the chat app */
+        .app-container {
+            width: 100%;
+            max-width: 800px;
+            height: 100%; /* Use full viewport height */
+            max-height: 95vh; /* Max height limit */
+            background-color: #E5DDD5; /* Chat background */
+            display: flex;
+            flex-direction: column;
+            box-shadow: 0 1px 1px 0 rgba(0,0,0,0.06), 0 2px 5px 0 rgba(0,0,0,0.2);
+            overflow: hidden; /* Important for layout */
+            position: relative; /* Context for absolute video container */
+        }
+
+        /* --- Login Screen --- */
+        #login-screen {
+            display: flex; flex-direction: column; justify-content: center; align-items: center;
+            text-align: center; padding: 40px; background-color: #f8f9fa; height: 100%;
+        }
+        #login-screen h1 { color: #444; margin-bottom: 30px; font-weight: 300; }
+        /* --- Login Screen Form --- */
+        #login-form {
+            display: flex;
+            flex-direction: column;
+            align-items: center;
+        }
+        #login-screen input[type="text"],
+        #login-screen input[type="password"] { /* Style both inputs */
+             padding: 12px 15px;
+             margin-bottom: 20px;
+             border: 1px solid #ccc;
+             border-radius: 20px;
+             width: 250px;
+             font-size: 1em;
+             outline: none;
+        }
+        #login-screen input[type="text"]:focus,
+        #login-screen input[type="password"]:focus {
+             border-color: #075E54;
+             box-shadow: 0 0 0 2px rgba(7, 94, 84, 0.2);
+        }
+        #login-screen button {
+             padding: 12px 30px;
+             background-color: #075E54;
+             color: white;
+             border: none;
+             border-radius: 20px;
+             cursor: pointer;
+             font-size: 1em;
+             transition: background-color 0.2s;
+        }
+        #login-screen button:hover { background-color: #128C7E; }
+        /* --- Login Error Message --- */
+        #login-error {
+            color: #d9534f; /* Red color for errors */
+            margin-top: 15px;
+            font-size: 0.9em;
+            height: 1.2em; /* Reserve space even when empty */
+            text-align: center;
+            font-weight: bold;
+            min-width: 250px; /* Match input width roughly */
+        }
+
+        /* --- Chat Screen --- */
+        #chat-screen {
+            display: none; /* Hidden initially */
+            flex-direction: column;
+            height: 100%;
+            width: 100%;
+        }
+
+        /* Chat Header */
+        .chat-header {
+            background-color: #075E54;
+            color: white;
+            padding: 10px 15px;
+            display: flex;
+            align-items: center;
+            font-size: 1.1em;
+            min-height: 60px; /* Fixed height */
+            flex-shrink: 0; /* Prevent shrinking */
+        }
+        .chat-header h1 {
+             font-size: 1.2em;
+             font-weight: 500;
+        }
+
+        /* Messages Area */
+        #messages {
+            flex-grow: 1; /* Takes available space */
+            padding: 20px 5%; /* Padding left/right */
+            overflow-y: auto; /* Enable scrolling */
+            background-color: #E5DDD5; /* Default chat background color */
+            /* Optional: Add the WhatsApp background pattern */
+            /* background-image: url('https://user-images.githubusercontent.com/15075759/28719144-86dc0f70-73b1-11e7-911d-60d70fcded21.png'); */
+            display: flex;
+            flex-direction: column;
+            gap: 5px; /* Small gap between elements (messages/separators) */
+        }
+
+        /* --- Date Separator --- */
+        .date-separator {
+            align-self: center;
+            background-color: #e1f7fb; /* Light blueish */
+            color: #586063;
+            font-size: 0.75em;
+            padding: 4px 10px;
+            border-radius: 8px;
+            margin: 15px 0 10px 0; /* Space around separator */
+            font-weight: 500;
+            box-shadow: 0 1px 1px rgba(0,0,0,0.05);
+        }
+
+        /* Individual Message Container Styling */
+        .message {
+            display: flex;
+            max-width: 70%; /* Max width of a message bubble + avatar */
+            align-items: flex-end; /* Align avatar and bubble bottom */
+            gap: 8px; /* Space between avatar and bubble */
+            margin-bottom: 5px; /* Space below each message */
+            position: relative; /* Added relative for call button */
+        }
+
+        /* --- Avatar Styling --- */
+        .avatar {
+            width: 30px;
+            height: 30px;
+            border-radius: 50%;
+            background-color: #ccc; /* Default bg */
+            color: white;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            font-size: 0.8em;
+            font-weight: bold;
+            text-transform: uppercase;
+            flex-shrink: 0; /* Prevent shrinking */
+        }
+
+        /* Message Bubble Styling */
+        .message-bubble {
+            padding: 8px 12px;
+            border-radius: 8px;
+            position: relative; /* For timestamp positioning */
+            word-wrap: break-word; /* Wrap long words */
+            box-shadow: 0 1px 1px rgba(0,0,0,0.1);
+            min-width: 80px; /* Ensure timestamp fits well */
+        }
+
+        .message .username {
+            font-weight: bold;
+            font-size: 0.9em;
+            margin-bottom: 3px;
+            color: #075E54; /* Default color, can be adjusted */
+            display: block; /* Take its own line if needed */
+        }
+
+        .message .text {
+             font-size: 0.95em;
+             margin-right: 45px; /* Space for timestamp */
+             line-height: 1.4;
+             color: #303030; /* Main text color */
+        }
+
+        .message .time {
+            font-size: 0.7em;
+            color: #999;
+            position: absolute; /* Position relative to bubble */
+            bottom: 5px;
+            right: 8px;
+            white-space: nowrap; /* Prevent timestamp wrapping */
+        }
+
+        /* Incoming Message Styling */
+        .message.incoming {
+            align-self: flex-start; /* Align container to left */
+        }
+        .message.incoming .message-bubble {
+            background-color: #FFFFFF; /* White bubble */
+            border-top-left-radius: 0; /* Flat corner like WA */
+        }
+         /* Optionally assign different colors to incoming usernames */
+         .message.incoming .username {
+             /* Example: Use avatar color logic here if desired */
+             color: hsl(var(--user-hue, 0), 50%, 40%);
+         }
+        /* Hide avatar placeholder for outgoing messages */
+        .message.outgoing .avatar {
+            display: none;
+        }
+
+
+        /* Outgoing Message Styling */
+        .message.outgoing {
+            align-self: flex-end; /* Align container to right */
+        }
+        .message.outgoing .message-bubble {
+            background-color: #DCF8C6; /* Light green bubble */
+            border-top-right-radius: 0; /* Flat corner like WA */
+        }
+         /* Hide username for outgoing messages for cleaner look */
+         .message.outgoing .username {
+             display: none;
+         }
+         .message.outgoing .time {
+             color: #6aaa96; /* Slightly different time color */
+         }
+
+
+        /* System Message Styling */
+        .system-message {
+            align-self: center; /* Center align */
+            background-color: #E1F3FB; /* Light blue background */
+            color: #555;
+            font-size: 0.8em;
+            padding: 5px 10px;
+            border-radius: 10px;
+            margin: 10px 0;
+            font-style: italic;
+            box-shadow: 0 1px 1px rgba(0,0,0,0.05);
+        }
+
+        /* --- Call Button on Incoming Messages --- */
+        .call-button {
+            background: none; border: none; cursor: pointer;
+            font-size: 1.1em; color: #075E54; padding: 2px 5px;
+            position: absolute; /* Position near the message bubble */
+            top: -10px; /* Adjust as needed */
+            right: -25px; /* Adjust as needed */
+            display: none; /* Hide by default */
+            opacity: 0.7;
+            transition: opacity 0.2s;
+            z-index: 5; /* Ensure it's clickable over potential bubble margins */
+        }
+        .message.incoming:hover .call-button {
+            display: inline-block; /* Show on hover of incoming message */
+        }
+        .call-button:hover {
+            opacity: 1;
+            color: #128C7E;
+        }
+
+        /* --- Footer Area (Input + Typing Indicator) --- */
+        .chat-footer {
+             background-color: #F0F0F0; /* Light grey background for whole footer */
+             padding: 5px 15px 10px 15px; /* Padding top adjusted */
+             display: flex;
+             flex-direction: column; /* Stack input form and typing indicator */
+             flex-shrink: 0; /* Prevent shrinking */
+             border-top: 1px solid #e0e0e0; /* Subtle top border */
+             position: relative; /* Needed for emoji picker positioning context */
+        }
+
+         /* --- Typing Indicator --- */
+        #typing-indicator {
+            height: 20px; /* Reserve space */
+            font-size: 0.8em;
+            color: #777;
+            font-style: italic;
+            padding-left: 5px; /* Align with start of input area roughly */
+            min-height: 20px; /* Ensure it takes space even when empty */
+            overflow: hidden;
+            text-overflow: ellipsis;
+            white-space: nowrap;
+            visibility: hidden; /* Hide until someone is typing */
+        }
+
+        /* Message Input Form */
+        #message-form {
+            display: flex;
+            align-items: center;
+            width: 100%; /* Take full width within footer */
+        }
+
+        /* --- Emoji Button --- */
+        #emoji-button {
+            background: none;
+            border: none;
+            font-size: 1.6em; /* Larger emoji icon */
+            padding: 8px;
+            cursor: pointer;
+            color: #54656f;
+            margin-right: 5px;
+            flex-shrink: 0;
+        }
+         #emoji-button:hover {
+            color: #3b4a54;
+         }
+
+        /* Input Field */
+        #message-input {
+            flex-grow: 1;
+            padding: 10px 15px;
+            border: none;
+            border-radius: 20px; /* Rounded input field */
+            margin-right: 10px;
+            font-size: 1em;
+            outline: none;
+            background-color: #fff; /* White background for input */
+        }
+
+        /* Send Button */
+        #message-form button[type="submit"] {
+            background-color: #128C7E; /* WhatsApp Send Green */
+            color: white;
+            border: none;
+            border-radius: 50%; /* Circular button */
+            width: 44px;
+            height: 44px;
+            cursor: pointer;
+            font-size: 1.5em;
+             display: flex;
+            justify-content: center;
+            align-items: center;
+            transition: background-color 0.2s;
+            flex-shrink: 0;
+            /* Simple Send Icon using SVG */
+             padding-bottom: 2px; /* Adjust symbol position slightly */
+        }
+         /* Simple SVG Send Icon */
+         #message-form button[type="submit"] svg {
+             width: 24px;
+             height: 24px;
+             fill: white;
+         }
+
+        #message-form button[type="submit"]:hover {
+            background-color: #075E54; /* Darker green on hover */
+        }
+
+         /* --- Emoji Picker --- */
+        emoji-picker {
+            position: absolute;
+            bottom: 65px; /* Position above input area footer */
+            left: 10px;   /* Adjust left positioning */
+            z-index: 10;
+            display: none; /* Hidden by default */
+            box-shadow: 0 4px 10px rgba(0,0,0,0.2);
+            border-radius: 8px;
+            border: 1px solid #ccc;
+         }
+        emoji-picker.visible {
+            display: block;
+        }
+
+
+        /* Hide the original separate user list block (if it existed) */
+        #user-list { display: none; }
+
+
+        /* --- Video Call Container --- */
+        #call-container {
+            position: absolute;
+            top: 0; left: 0; right: 0; bottom: 0;
+            background-color: rgba(0, 0, 0, 0.9); /* Dark overlay */
+            display: none; /* Hidden by default */
+            flex-direction: column;
+            justify-content: center;
+            align-items: center;
+            z-index: 100;
+            padding: 20px;
+        }
+        #call-container.active {
+             display: flex; /* Show when call is active */
+        }
+
+        #video-grid {
+            display: flex;
+            justify-content: center;
+            align-items: center;
+            gap: 10px;
+            width: 100%;
+            max-width: 700px; /* Limit width */
+            position: relative; /* For positioning local video */
+            flex-grow: 1; /* Take available space */
+            min-height: 200px; /* Ensure grid takes some space even before video loads */
+        }
+
+        #remote-video {
+            width: 100%; /* Take full width */
+            max-height: 80vh; /* Limit height */
+            background-color: #222;
+            border-radius: 8px;
+            object-fit: contain; /* Scale video nicely */
+        }
+
+        #local-video {
+            width: 25%; /* Smaller local video */
+            max-width: 150px;
+            position: absolute;
+            bottom: 15px;
+            right: 15px;
+            border: 2px solid rgba(255, 255, 255, 0.5);
+            border-radius: 5px;
+            background-color: #333;
+            object-fit: cover; /* Fill the small frame */
+            z-index: 101; /* Above remote video if overlapping */
+        }
+
+        #call-controls {
+            display: flex;
+            gap: 20px;
+            margin-top: 15px;
+            flex-shrink: 0; /* Prevent shrinking */
+        }
+
+        #call-controls button {
+            padding: 12px 18px;
+            border-radius: 50%; /* Circular buttons */
+            border: none;
+            cursor: pointer;
+            font-size: 1.4em; /* Icon size */
+            width: 55px;
+            height: 55px;
+            display: flex;
+            justify-content: center;
+            align-items: center;
+            transition: background-color 0.2s;
+        }
+
+        #hangup-button {
+            background-color: #ff4d4d; /* Red */
+            color: white;
+        }
+        #hangup-button:hover {
+             background-color: #e60000;
+        }
+
+        /* --- Incoming Call Notification --- */
+        #incoming-call-notification {
+            position: absolute;
+            top: 70px; /* Below header */
+            left: 50%;
+            transform: translateX(-50%);
+            background-color: #075E54;
+            color: white;
+            padding: 15px 25px;
+            border-radius: 8px;
+            box-shadow: 0 4px 10px rgba(0,0,0,0.3);
+            z-index: 110;
+            display: none; /* Hidden by default */
+            text-align: center;
+            min-width: 280px;
+        }
+        #incoming-call-notification p {
+            margin-bottom: 15px;
+            font-size: 1.1em;
+        }
+        #incoming-call-controls button {
+             padding: 8px 15px;
+             margin: 0 10px;
+             border: none;
+             border-radius: 5px;
+             cursor: pointer;
+             font-size: 0.9em;
+             transition: background-color 0.2s;
+        }
+        #accept-call-button { background-color: #25D366; color: white; }
+        #reject-call-button { background-color: #ff4d4d; color: white; }
+        #accept-call-button:hover { background-color: #1DAF53; }
+        #reject-call-button:hover { background-color: #e60000; }
+
+    </style>
+</head>
+<body>
+    <!-- Main container for the app -->
+    <div class="app-container">
+
+        <!-- Login Screen View -->
+        <div id="login-screen">
+             <h1>Login or Register</h1>
+             <form id="login-form">
+                 <input type="text" id="username-input" placeholder="Enter your username" required autocomplete="username">
+                 <input type="password" id="password-input" placeholder="Enter your password" required autocomplete="current-password">
+                 <button type="submit">Login / Register</button>
+             </form>
+             <!-- Area to display login errors -->
+             <div id="login-error"></div>
+        </div>
+
+        <!-- Chat Screen View (Initially Hidden) -->
+        <div id="chat-screen">
+            <!-- Chat Header -->
+            <div class="chat-header">
+                <h1 id="chat-title">Group Chat</h1>
+            </div>
+
+            <!-- Message Display Area -->
+            <div id="messages">
+                <!-- Messages, Date Separators, Avatars will be added here by JS -->
+            </div>
+
+            <!-- Footer: Typing Indicator + Input Form -->
+            <div class="chat-footer">
+                 <div id="typing-indicator"></div> <!-- Typing indicator display -->
+                 <form id="message-form">
+                    <!-- Emoji toggle button -->
+                    <button type="button" id="emoji-button">😀</button>
+                    <!-- Message text input -->
+                    <input type="text" id="message-input" placeholder="Type a message" required autocomplete="off">
+                    <!-- Send message button -->
+                    <button type="submit">
+                        <svg viewBox="0 0 24 24"><path fill="currentColor" d="M1.101 21.757 23.8 12.028 1.101 2.3l.011 7.912 13.623 1.816-13.623 1.817-.011 7.912z"></path></svg>
+                    </button>
+                 </form>
+            </div>
+
+            <!-- Emoji Picker Element (positioned absolutely relative to footer) -->
+            <emoji-picker class="light"></emoji-picker>
+
+        </div> <!-- End #chat-screen -->
+
+        <!-- Video Call UI -->
+        <div id="call-container">
+            <div id="video-grid">
+                <video id="remote-video" playsinline autoplay></video>
+                <video id="local-video" playsinline autoplay muted></video> <!-- Muted local video -->
+            </div>
+            <div id="call-controls">
+                <button id="hangup-button">❌</button> <!-- Simple hangup icon -->
+                 <!-- Add mute/video toggle buttons later if needed -->
+            </div>
+        </div>
+
+        <!-- Incoming Call Notification -->
+        <div id="incoming-call-notification">
+             <p id="incoming-call-text">Incoming call from User...</p>
+             <div id="incoming-call-controls">
+                 <button id="accept-call-button">✔️ Accept</button>
+                 <button id="reject-call-button">✖️ Reject</button>
+             </div>
+        </div>
+
+    </div> <!-- End .app-container -->
+
+    <!-- Include Socket.IO client library -->
+    <script src="/socket.io/socket.io.js"></script>
+    <!-- Main application JavaScript -->
+    <script>
+        const socket = io();
+        let currentUsername = ''; // Stores the username after successful login
+        let lastMessageDate = null; // Tracks date for separators
+        let typingTimeout = null;   // Timer for typing indicator
+
+        // --- DOM Elements ---
+        const loginScreen = document.getElementById('login-screen');
+        const chatScreen = document.getElementById('chat-screen');
+        const loginForm = document.getElementById('login-form');
+        const usernameInput = document.getElementById('username-input');
+        const passwordInput = document.getElementById('password-input');
+        const loginError = document.getElementById('login-error');
+        const messagesDiv = document.getElementById('messages');
+        const messageForm = document.getElementById('message-form');
+        const messageInput = document.getElementById('message-input');
+        const chatTitle = document.getElementById('chat-title');
+        const typingIndicator = document.getElementById('typing-indicator');
+        const emojiButton = document.getElementById('emoji-button');
+        const emojiPicker = document.querySelector('emoji-picker');
+
+        // --- Video Call DOM Elements & State ---
+        const callContainer = document.getElementById('call-container');
+        const localVideo = document.getElementById('local-video');
+        const remoteVideo = document.getElementById('remote-video');
+        const hangupButton = document.getElementById('hangup-button');
+        const incomingCallNotification = document.getElementById('incoming-call-notification');
+        const incomingCallText = document.getElementById('incoming-call-text');
+        const acceptCallButton = document.getElementById('accept-call-button');
+        const rejectCallButton = document.getElementById('reject-call-button');
+
+        let localStream = null;
+        let peerConnection = null;
+        let isCallActive = false;
+        let otherUserInCall = null; // Stores the username of the person we are calling/is calling us
+        let pendingCallOffer = null; // Store offer if received before local media ready
+
+        // STUN servers configuration (using Google's public servers)
+        const iceServers = {
+            iceServers: [
+                { urls: 'stun:stun.l.google.com:19302' },
+                { urls: 'stun:stun1.l.google.com:19302' },
+                // Add TURN servers here if you have them for better reliability
+            ],
+        };
+        // --- END: Video Call DOM Elements & State ---
+
+
+        // --- Event Listeners (Chat + Call) ---
+
+        // Login form submission
+        loginForm.addEventListener('submit', (e) => {
+            e.preventDefault();
+            const username = usernameInput.value.trim();
+            const password = passwordInput.value; // Get password
+            loginError.textContent = ''; // Clear previous errors
+            if (username && password) {
+                socket.emit('attempt_login', { username, password });
+            } else {
+                loginError.textContent = 'Please enter both username and password.';
+            }
+        });
+
+        // Message form submission
+        messageForm.addEventListener('submit', (e) => {
+            e.preventDefault();
+            const text = messageInput.value.trim();
+            if (text && currentUsername) {
+                const timestamp = new Date().toISOString(); // Use ISO string for consistency
+                // Display own message immediately
+                addMessage(currentUsername, text, timestamp);
+                // Send message data to server
+                socket.emit('message', { text });
+                // Clear typing status immediately
+                if (typingTimeout) {
+                     clearTimeout(typingTimeout);
+                     typingTimeout = null;
+                     socket.emit('stop_typing'); // Inform server typing stopped
+                 }
+                messageInput.value = ''; // Clear input field
+                emojiPicker.classList.remove('visible'); // Hide emoji picker
+                messageInput.focus(); // Keep focus on input
+            }
+        });
+
+        // --- Typing Indicator Logic ---
+        messageInput.addEventListener('input', () => {
+            if (!currentUsername) return; // Ignore typing if not logged in
+            if (!typingTimeout) {
+                socket.emit('typing'); // Send 'typing' event only on the first keypress after pause
+            } else {
+                clearTimeout(typingTimeout); // Reset the timeout if already typing
+            }
+            // Set a timeout to send 'stop_typing' if no input for 1.5 seconds
+            typingTimeout = setTimeout(() => {
+                socket.emit('stop_typing');
+                typingTimeout = null; // Reset the timeout ID state
+            }, 1500);
+        });
+
+        // --- Emoji Picker Logic ---
+        emojiButton.addEventListener('click', () => {
+            emojiPicker.classList.toggle('visible');
+            if(emojiPicker.classList.contains('visible')) {
+                 messageInput.focus(); // Keep focus on input when picker opens
+            }
+        });
+        emojiPicker.addEventListener('emoji-click', event => {
+            messageInput.value += event.detail.unicode;
+            emojiPicker.classList.remove('visible'); // Hide picker after selection
+            messageInput.focus(); // Return focus to input field
+        });
+         // Hide emoji picker if a click occurs outside
+         document.addEventListener('click', (event) => {
+            const isClickInsidePicker = emojiPicker.contains(event.target);
+            const isClickOnEmojiButton = (event.target === emojiButton || emojiButton.contains(event.target)); // Check button itself or icon inside
+
+            if (!isClickInsidePicker && !isClickOnEmojiButton && emojiPicker.classList.contains('visible')) {
+                 emojiPicker.classList.remove('visible');
+            }
+         });
+
+
+        // --- Video Call Event Listeners ---
+
+        // Hang Up Button
+        hangupButton.addEventListener('click', () => {
+             hangUpCall(); // Cleans up locally and optionally notifies server
+        });
+
+        // Accept Incoming Call Button
+        acceptCallButton.addEventListener('click', () => {
+            const callerUsername = incomingCallNotification.dataset.caller;
+            if (callerUsername) {
+                 console.log(`Accepting call from ${callerUsername}`);
+                 hideIncomingCallNotification();
+                 socket.emit('accept-call', { callerUsername });
+                 // The server will respond with 'prepare-for-offer' or handle errors
+            } else {
+                console.error("Cannot accept call, caller username not found in notification data.");
+                hideIncomingCallNotification(); // Hide inconsistent notification
+            }
+        });
+
+        // Reject Incoming Call Button
+        rejectCallButton.addEventListener('click', () => {
+            const callerUsername = incomingCallNotification.dataset.caller;
+             if (callerUsername) {
+                 console.log(`Rejecting call from ${callerUsername}`);
+                 hideIncomingCallNotification();
+                 socket.emit('reject-call', { callerUsername });
+                 otherUserInCall = null; // Ensure state is cleared locally
+             } else {
+                 console.error("Cannot reject call, caller username not found in notification data.");
+                 hideIncomingCallNotification(); // Hide inconsistent notification
+             }
+        });
+
+        // --- END: Video Call Event Listeners ---
+
+
+        // --- Socket Event Handlers (Chat + Call) ---
+
+        // LOGIN SUCCESS
+        socket.on('login_success', (username) => {
+            currentUsername = username; // Store logged-in username
+            loginScreen.style.display = 'none'; // Hide login screen
+            chatScreen.style.display = 'flex'; // Show chat screen
+            chatTitle.textContent = `Chatting as ${currentUsername}`; // Update header
+            messagesDiv.innerHTML = ''; // Clear any previous messages
+            lastMessageDate = null;    // Reset date separator tracking
+            messageInput.focus(); // Focus the message input field
+            requestNotificationPermission(); // Ask for notification permission
+            resetCallState(); // Ensure call state is clean on login
+        });
+
+        // LOGIN FAIL
+        socket.on('login_fail', (errorMessage) => {
+            loginError.textContent = errorMessage; // Show error message
+            passwordInput.value = ''; // Clear password field for retry
+            passwordInput.focus();    // Focus password field after error
+        });
+
+        // INCOMING MESSAGE
+        socket.on('message', (data) => {
+            // Only display if the message is from a different user
+            if (data.username !== currentUsername) {
+                 addMessage(data.username, data.text, data.timestamp); // Pass ISO timestamp
+                 showNotification(`${data.username}: ${data.text}`); // Show notification if tab not active
+            }
+        });
+
+        // USER JOIN/LEAVE/LIST
+        socket.on('user_join', (username) => {
+            if (username !== currentUsername && currentUsername) { // Also check if current user is logged in
+                addSystemMessage(`${username} has joined`);
+            }
+        });
+        socket.on('user_leave', (username) => {
+             if (username !== currentUsername && currentUsername) { // Check if current user is logged in
+                addSystemMessage(`${username} has left`);
+                 // If the user who left was the one we were in a call with
+                 if (isCallActive && otherUserInCall === username) {
+                    console.log("Other user disconnected during call.");
+                    addSystemMessage(`Call with ${username} ended (user disconnected).`);
+                    hangUpCall(false); // Clean up locally, don't emit hangup again
+                 }
+            }
+        });
+        socket.on('user_list', (users) => {
+            console.log("Online users:", users);
+            // Potential future use: update online status indicators, etc.
+        });
+
+        // TYPING STATUS
+        socket.on('user_typing_status', (typingUsers) => {
+             // Filter out the current user from the list of typers
+             const otherTypingUsers = typingUsers.filter(u => u !== currentUsername);
+            if (otherTypingUsers.length === 0) {
+                typingIndicator.textContent = ''; // Clear indicator text
+                typingIndicator.style.visibility = 'hidden'; // Hide the indicator element
+            } else {
+                 let text = '';
+                 if (otherTypingUsers.length === 1) {
+                     text = `${otherTypingUsers[0]} is typing...`;
+                 } else if (otherTypingUsers.length <= 3) {
+                     text = `${otherTypingUsers.join(', ')} are typing...`;
+                 } else {
+                      text = 'Several people are typing...';
+                 }
+                 typingIndicator.textContent = text; // Set the indicator text
+                 typingIndicator.style.visibility = 'visible'; // Make the indicator element visible
+            }
+        });
+
+
+        // --- START: Video Call Socket Handlers ---
+
+        // Notification of an incoming call
+        socket.on('incoming-call', ({ callerUsername }) => {
+             if (isCallActive || otherUserInCall || incomingCallNotification.style.display === 'block') {
+                 // Already in a call, processing one, or notification already shown
+                 console.warn("Received incoming call while busy or already notified, rejecting.");
+                 socket.emit('reject-call', { callerUsername }); // Inform server to notify caller
+                 return;
+             }
+             console.log(`Incoming call from ${callerUsername}`);
+             otherUserInCall = callerUsername; // Tentatively set the user we might talk to
+             showIncomingCallNotification(callerUsername);
+        });
+
+        // The user we called has accepted
+        socket.on('call-accepted', ({ acceptorUsername }) => {
+            if (!otherUserInCall || otherUserInCall !== acceptorUsername) {
+                console.warn(`Received call-accepted from ${acceptorUsername}, but expected ${otherUserInCall || 'nobody'}.`);
+                // Maybe the call was cancelled or timed out locally? Reset state just in case.
+                if (!isCallActive) resetCallState(); // Reset if not actually in call setup
+                return;
+            }
+            console.log(`${acceptorUsername} accepted the call. Starting WebRTC offer.`);
+            // otherUserInCall should already be set correctly from initiateCallRequest
+            startCallNegotiation(true); // Start negotiation as the caller (will create offer)
+        });
+
+        // We accepted a call, now prepare for the offer from the caller
+        socket.on('prepare-for-offer', ({ callerUsername }) => {
+             if (!otherUserInCall || otherUserInCall !== callerUsername) {
+                console.warn(`Received prepare-for-offer from ${callerUsername}, but expected ${otherUserInCall || 'nobody'}.`);
+                // Maybe the user cancelled/rejected before server processed accept? Reset state.
+                 if (!isCallActive) resetCallState();
+                 return;
+             }
+             console.log(`Call accepted. Preparing to receive offer from ${callerUsername}.`);
+             // otherUserInCall should be set from 'incoming-call' handler or accept button logic
+             startCallNegotiation(false); // Start negotiation as the callee (will wait for offer)
+        });
+
+
+        // The user we called rejected the call
+        socket.on('call-rejected', ({ rejectorUsername }) => {
+            if (otherUserInCall === rejectorUsername) {
+                console.log(`${rejectorUsername} rejected the call.`);
+                addSystemMessage(`Call rejected by ${rejectorUsername}.`);
+                resetCallState(); // Clean up our state since the call attempt failed
+            } else {
+                console.warn(`Received rejection from ${rejectorUsername}, but was expecting ${otherUserInCall || 'nobody'}`);
+            }
+        });
+
+        // The call could not proceed (user busy, offline, conflict)
+        socket.on('call-denied', ({ reason }) => {
+            console.log(`Call denied: ${reason}`);
+            addSystemMessage(`Call could not be started: ${reason}`);
+             hideIncomingCallNotification(); // Ensure notification is hidden
+            resetCallState(); // Clean up our state since the call attempt failed
+        });
+
+        // Receive WebRTC offer from the caller
+        socket.on('webrtc-offer', async ({ offer, callerUsername }) => {
+             if (otherUserInCall !== callerUsername) {
+                 console.warn(`Received offer from ${callerUsername}, but currently expect call with ${otherUserInCall || 'nobody'}. Ignoring.`);
+                 return;
+             }
+             if (!peerConnection) {
+                 console.warn("Received offer, but PeerConnection is not ready. Storing offer.");
+                 // Store the offer to handle once the peer connection is ready (in startCallNegotiation(false))
+                 pendingCallOffer = { offer, callerUsername };
+                 // If startCallNegotiation hasn't run yet, this will be picked up there.
+                 // If it HAS run but PC isn't ready (unlikely), need more robust handling.
+                 return;
+             }
+             console.log("Received WebRTC Offer from", callerUsername);
+             try {
+                await peerConnection.setRemoteDescription(new RTCSessionDescription(offer));
+                console.log("Remote description (offer) set. Creating answer...");
+                const answer = await peerConnection.createAnswer();
+                await peerConnection.setLocalDescription(answer);
+                console.log("Local description (answer) set. Sending answer...");
+                socket.emit('webrtc-answer', { targetUsername: otherUserInCall, answer });
+                pendingCallOffer = null; // Clear any pending offer
+            } catch (error) {
+                console.error("Error handling offer:", error);
+                addSystemMessage("Error setting up call connection (offer).");
+                hangUpCall(); // Attempt cleanup
+            }
+        });
+
+        // Receive WebRTC answer from the acceptor
+        socket.on('webrtc-answer', async ({ answer, acceptorUsername }) => {
+             if (!peerConnection || otherUserInCall !== acceptorUsername) {
+                  console.warn(`Received answer from ${acceptorUsername}, but not ready or wrong user (expected ${otherUserInCall || 'nobody'}).`);
+                 return;
+             }
+             console.log("Received WebRTC Answer from", acceptorUsername);
+             try {
+                 await peerConnection.setRemoteDescription(new RTCSessionDescription(answer));
+                 console.log("Remote description (answer) set. Connection should establish.");
+             } catch (error) {
+                 console.error("Error handling answer:", error);
+                 addSystemMessage("Error setting up call connection (answer).");
+                 hangUpCall(); // Attempt cleanup
+             }
+        });
+
+        // Receive ICE candidate from the peer
+        socket.on('webrtc-ice-candidate', ({ candidate }) => {
+             if (!peerConnection || !peerConnection.remoteDescription) {
+                  // Wait until remote description is set before adding candidates
+                  console.warn("Received ICE candidate prematurely. Ignoring.");
+                 return;
+             }
+             if (!candidate) {
+                 console.log("Received null ICE candidate (end of candidates signal).");
+                 return;
+             }
+            // console.log("Received ICE Candidate"); // Can be very noisy
+            try {
+                peerConnection.addIceCandidate(new RTCIceCandidate(candidate))
+                    .catch(e => console.error("Error adding received ICE candidate", e));
+            } catch (error) {
+                // Ignore errors like "Error processing ICE candidate" if state is wrong
+                if (!isCallActive) {
+                    console.warn("Ignoring ICE candidate error as call is not active:", error.message);
+                } else {
+                    console.error("Error processing received ICE candidate:", error);
+                }
+            }
+        });
+
+        // Call ended by the other user (hangup or disconnect) or server cleanup
+        socket.on('call-ended', () => {
+             console.log("Received 'call-ended' signal.");
+             if (isCallActive) {
+                 addSystemMessage(`Call with ${otherUserInCall || 'user'} ended.`);
+                 hangUpCall(false); // Clean up locally, don't emit hangup again
+             } else {
+                 // Might receive this if call was rejected/denied and server initiated cleanup,
+                 // or if local state was already cleaned up. Ensure UI is reset.
+                 console.log("Call already ended locally or wasn't active. Ensuring cleanup.");
+                 resetCallState();
+                 hideIncomingCallNotification();
+             }
+        });
+
+
+        // --- END: Video Call Socket Handlers ---
+
+
+        // --- Helper Functions (Chat + Call) ---
+
+        // Add Regular Message (Includes Call Button)
+        function addMessage(username, text, timestampISO) {
+            const messageDate = new Date(timestampISO); // Parse ISO string
+            maybeAddDateSeparator(messageDate); // Check if a date separator is needed
+
+            const messageDiv = document.createElement('div');
+            messageDiv.classList.add('message');
+
+            const isOutgoing = (username === currentUsername);
+            messageDiv.classList.add(isOutgoing ? 'outgoing' : 'incoming');
+
+            // Add Avatar only for incoming messages
+            if (!isOutgoing) {
+                messageDiv.appendChild(createAvatar(username));
+            }
+
+            const bubble = document.createElement('div');
+            bubble.classList.add('message-bubble');
+
+            // Add username span only for incoming messages
+            if (!isOutgoing) {
+                const usernameSpan = document.createElement('span');
+                usernameSpan.className = 'username';
+                usernameSpan.textContent = username;
+                // Optional: Apply user-specific color
+                // const userHue = stringToHslColor(username, 0, 0, true);
+                // usernameSpan.style.setProperty('--user-hue', userHue);
+                bubble.appendChild(usernameSpan);
+
+                // --- Add Call Button for Incoming Messages ---
+                const callBtn = document.createElement('button');
+                callBtn.className = 'call-button';
+                callBtn.innerHTML = '📞'; // Phone icon
+                callBtn.title = `Call ${username}`;
+                callBtn.onclick = (e) => {
+                    e.stopPropagation(); // Prevent triggering other click events if nested
+                    initiateCallRequest(username);
+                };
+                // Append near the bubble, but within the message container for positioning
+                messageDiv.appendChild(callBtn);
+                // --- End Call Button ---
+            }
+
+            const textSpan = document.createElement('span');
+            textSpan.className = 'text';
+            textSpan.textContent = text; // Use textContent for security
+
+            const timeSpan = document.createElement('span');
+            timeSpan.className = 'time';
+            // Format time as HH:MM
+            timeSpan.textContent = `${messageDate.getHours()}:${String(messageDate.getMinutes()).padStart(2, '0')}`;
+
+            bubble.appendChild(textSpan);
+            bubble.appendChild(timeSpan);
+            messageDiv.appendChild(bubble); // Add bubble after avatar/call button
+
+            messagesDiv.appendChild(messageDiv);
+            scrollToBottom(); // Scroll down after adding message
+        }
+
+        // Add System Message
+        function addSystemMessage(text) {
+            maybeAddDateSeparator(new Date()); // Check date for system messages too
+            const message = document.createElement('div');
+            message.className = 'system-message';
+            message.textContent = text;
+            messagesDiv.appendChild(message);
+            scrollToBottom(); // Scroll down
+        }
+
+        // --- Date Separator Logic ---
+        function maybeAddDateSeparator(messageDate) {
+            const messageDay = messageDate.toDateString();
+            const lastDay = lastMessageDate ? lastMessageDate.toDateString() : null;
+            if (messageDay !== lastDay) {
+                const separator = document.createElement('div');
+                separator.className = 'date-separator';
+                separator.textContent = formatDateSeparator(messageDate); // Format the date text
+                messagesDiv.appendChild(separator);
+                lastMessageDate = messageDate; // Update the date of the last displayed item
+            }
+        }
+        function formatDateSeparator(date) {
+            const today = new Date();
+            const yesterday = new Date(today);
+            yesterday.setDate(today.getDate() - 1);
+            if (date.toDateString() === today.toDateString()) { return 'Today'; }
+            else if (date.toDateString() === yesterday.toDateString()) { return 'Yesterday'; }
+            else { return date.toLocaleDateString(undefined, { day: 'numeric', month: 'short', year: 'numeric' }); }
+        }
+
+        // --- Avatar Creation Logic ---
+        function createAvatar(username) {
+            const avatar = document.createElement('div');
+            avatar.className = 'avatar';
+            const initials = username?.substring(0, 2).toUpperCase() || '?';
+            avatar.textContent = initials;
+            avatar.style.backgroundColor = stringToHslColor(username || '', 50, 60); // Saturation 50%, Lightness 60%
+            return avatar;
+        }
+        function stringToHslColor(str, s, l, hueOnly = false) {
+            if (!str) return hueOnly ? 0 : `hsl(0, ${s}%, ${l}%)`;
+            let hash = 0;
+            for (let i = 0; i < str.length; i++) {
+                hash = str.charCodeAt(i) + ((hash << 5) - hash); hash = hash & hash;
+            }
+            const h = Math.abs(hash % 360);
+            return hueOnly ? h : `hsl(${h}, ${s}%, ${l}%)`;
+        }
+
+        // --- Scrolling ---
+        function scrollToBottom() {
+            requestAnimationFrame(() => {
+                 messagesDiv.scrollTo({ top: messagesDiv.scrollHeight, behavior: 'smooth' });
+            });
+        }
+
+         // --- Browser Notifications ---
+         function requestNotificationPermission() {
+             if ('Notification' in window && Notification.permission !== 'granted' && Notification.permission !== 'denied') {
+                 Notification.requestPermission().then(permission => {
+                    if (permission === 'granted') { console.log('Notification permission granted.'); }
+                    else { console.log('Notification permission denied.'); }
+                 });
+             }
+         }
+         function showNotification(body) {
+             if (!('Notification' in window) || Notification.permission !== 'granted') { return; }
+             if (document.hidden) { // Only show if tab is not active
+                  const notification = new Notification('New Chat Message', {
+                      body: body,
+                      icon: '/favicon.ico' // Optional: place an icon named favicon.ico in your public folder
+                  });
+                  setTimeout(notification.close.bind(notification), 5000);
+                  notification.onclick = () => { window.focus(); };
+             }
+         }
+
+        // --- START: Video Call Helper Functions ---
+
+        // 1. Request to start a call with a user
+        function initiateCallRequest(targetUsername) {
+            if (isCallActive) {
+                addSystemMessage("You are already in a call.");
+                return;
+            }
+             if (otherUserInCall || incomingCallNotification.style.display === 'block') {
+                 addSystemMessage("Cannot start a new call while another is pending or incoming.");
+                 return;
+             }
+             if (targetUsername === currentUsername) {
+                addSystemMessage("You cannot call yourself.");
+                return;
+            }
+            console.log(`Requesting call with ${targetUsername}`);
+            addSystemMessage(`Calling ${targetUsername}...`);
+            otherUserInCall = targetUsername; // Tentatively set target for this call attempt
+            socket.emit('request-call', { targetUsername });
+            // Now wait for 'call-accepted', 'call-rejected', or 'call-denied' from server
+        }
+
+        // 2. Start media streams and WebRTC negotiation (called after acceptance)
+        async function startCallNegotiation(isCaller) {
+             console.log(`Starting negotiation. Is Caller: ${isCaller}`);
+             if (isCallActive) {
+                 console.warn("Negotiation requested but call is already active.");
+                 return; // Don't start negotiation again if already active
+             }
+             if (!otherUserInCall) {
+                 console.error("Cannot start negotiation, other user not set.");
+                 resetCallState(); // Reset if state is inconsistent
+                 return;
+             }
+
+             addSystemMessage(`Starting video call with ${otherUserInCall}...`);
+             showCallUI(); // Show the video elements and controls
+
+             try {
+                 // Get local camera/mic stream
+                 console.log("Requesting user media...");
+                 localStream = await navigator.mediaDevices.getUserMedia({ video: true, audio: true });
+                 localVideo.srcObject = localStream;
+                 console.log("Local stream obtained.");
+
+                 // Create PeerConnection
+                 createPeerConnection(); // This sets up the peerConnection object
+
+                 // Add local tracks to the connection BEFORE creating offer/answer
+                 localStream.getTracks().forEach(track => {
+                     if (peerConnection) {
+                         peerConnection.addTrack(track, localStream);
+                         console.log(`Added local track: ${track.kind}`);
+                     }
+                 });
+
+                 isCallActive = true; // Mark call as active *after* getting media/PC setup
+
+                 if (isCaller) {
+                     // Caller creates the offer
+                     if (!peerConnection) throw new Error("PeerConnection not available for creating offer.");
+                     console.log("Creating offer...");
+                     const offer = await peerConnection.createOffer();
+                     await peerConnection.setLocalDescription(offer);
+                     console.log("Local description (offer) set. Sending offer...");
+                     socket.emit('webrtc-offer', { targetUsername: otherUserInCall, offer });
+                 } else {
+                     // Callee waits for the offer (handled by 'webrtc-offer' socket event)
+                     console.log("Waiting for offer from caller...");
+                     // If an offer arrived *before* we were ready (before PC was created), handle it now
+                     if (pendingCallOffer) {
+                        console.log("Handling pending offer received earlier.");
+                        await handlePendingOffer();
+                     }
+                 }
+
+             } catch (error) {
+                 console.error("Error starting call negotiation:", error);
+                 addSystemMessage(`Error starting call: ${error.message}. Please check camera/mic permissions.`);
+                 hangUpCall(); // Clean up on error
+             }
+        }
+
+
+        // 3. Create the RTCPeerConnection object and set up listeners
+        function createPeerConnection() {
+             console.log("Creating PeerConnection with ICE servers:", iceServers);
+             // Clean up any previous connection first
+             if (peerConnection) {
+                 console.warn("Closing existing PeerConnection before creating new one.");
+                 peerConnection.close();
+             }
+
+             peerConnection = new RTCPeerConnection(iceServers);
+
+             // Listener for ICE candidates generated by the browser
+             peerConnection.onicecandidate = (event) => {
+                 if (event.candidate && otherUserInCall && isCallActive) { // Send only if call is active and peer known
+                     // console.log("Generated ICE Candidate:", event.candidate); // Noisy
+                     socket.emit('webrtc-ice-candidate', {
+                         targetUsername: otherUserInCall,
+                         candidate: event.candidate,
+                     });
+                 } else if (!event.candidate) {
+                     console.log("All ICE candidates have been sent.");
+                 }
+             };
+
+             // Listener for when the remote peer adds a track (video/audio)
+             peerConnection.ontrack = (event) => {
+                 console.log("Remote track received:", event.track.kind, "Stream count:", event.streams.length);
+                 if (event.streams && event.streams[0]) {
+                     console.log("Attaching remote stream to video element");
+                     remoteVideo.srcObject = event.streams[0];
+                 } else {
+                     // Fallback for browsers that might not bundle tracks into streams initially
+                     if (!remoteVideo.srcObject) {
+                         remoteVideo.srcObject = new MediaStream();
+                     }
+                      if(remoteVideo.srcObject.getVideoTracks().length === 0 && event.track.kind === 'video') {
+                          console.warn("Adding video track to remote stream.");
+                          remoteVideo.srcObject.addTrack(event.track);
+                      }
+                      if(remoteVideo.srcObject.getAudioTracks().length === 0 && event.track.kind === 'audio') {
+                          console.warn("Adding audio track to remote stream.");
+                          remoteVideo.srcObject.addTrack(event.track);
+                      }
+                 }
+             };
+
+             // Listen for connection state changes
+             peerConnection.oniceconnectionstatechange = () => {
+                 if (!peerConnection) return; // Connection might be closed already
+                 console.log(`ICE Connection State: ${peerConnection.iceConnectionState}`);
+                 if (peerConnection.iceConnectionState === 'failed' ||
+                     peerConnection.iceConnectionState === 'disconnected' ||
+                     peerConnection.iceConnectionState === 'closed') {
+                      if(isCallActive) { // Prevent cleanup if already hung up
+                         console.warn(`ICE connection issue: ${peerConnection.iceConnectionState}.`);
+                         // Avoid aggressive hangup on 'disconnected' as it might recover
+                         if (peerConnection.iceConnectionState === 'failed') {
+                            addSystemMessage("Call connection failed.");
+                            hangUpCall(); // Hang up on definite failure
+                         }
+                      }
+                 }
+             };
+
+             peerConnection.onconnectionstatechange = () => {
+                 if (!peerConnection) return;
+                 console.log(`Connection State: ${peerConnection.connectionState}`);
+                 if (peerConnection.connectionState === 'failed' || peerConnection.connectionState === 'closed') {
+                     if (isCallActive) {
+                         console.warn(`Connection issue: ${peerConnection.connectionState}.`);
+                         addSystemMessage("Call connection lost or closed.");
+                         hangUpCall(false); // Clean up locally if connection definitively fails/closes
+                     }
+                 } else if (peerConnection.connectionState === 'connected') {
+                     console.log("Peers connected successfully!");
+                     // Call is fully established
+                 }
+             };
+        }
+
+        // 4. Handle incoming call notification UI
+        function showIncomingCallNotification(callerUsername) {
+             incomingCallText.textContent = `Incoming call from ${callerUsername}`;
+             incomingCallNotification.dataset.caller = callerUsername; // Store caller name
+             incomingCallNotification.style.display = 'block';
+        }
+
+        function hideIncomingCallNotification() {
+             incomingCallNotification.style.display = 'none';
+             if (incomingCallNotification.dataset.caller) {
+                 delete incomingCallNotification.dataset.caller;
+             }
+             // If we hide the notification without accepting/rejecting, reset the potential peer
+             if (!isCallActive && otherUserInCall === incomingCallNotification.dataset.caller) {
+                 otherUserInCall = null;
+             }
+        }
+
+        // 5. Show/Hide the main video call UI
+        function showCallUI() {
+             callContainer.classList.add('active');
+        }
+
+        function hideCallUI() {
+             callContainer.classList.remove('active');
+        }
+
+        // 6. Clean up call state and resources
+        function hangUpCall(notifyServer = true) {
+            if (!isCallActive && !otherUserInCall && !localStream && !peerConnection) {
+                // Already cleaned up or never started
+                console.log("Hang up called, but no active call or resources found.");
+                resetCallState(); // Ensure UI is hidden etc.
+                return;
+            }
+            console.log("Hanging up call...");
+
+            if (isCallActive && notifyServer && otherUserInCall) {
+                 // Only notify server if the call was considered active and we know who to notify about
+                 console.log("Notifying server of hangup.");
+                 socket.emit('hangup-call'); // Inform the server/other peer
+             } else {
+                 console.log("Hangup: Not notifying server (call not active, peer unknown, or notifyServer=false).")
+             }
+
+            // Close peer connection
+             if (peerConnection) {
+                 peerConnection.close();
+                 peerConnection = null;
+                 console.log("PeerConnection closed.");
+             } else {
+                 console.log("Hangup: No PeerConnection to close.");
+             }
+
+            // Stop local media tracks
+             if (localStream) {
+                 localStream.getTracks().forEach(track => track.stop());
+                 localStream = null;
+                 console.log("Local stream stopped.");
+             } else {
+                  console.log("Hangup: No local stream to stop.");
+             }
+
+            // Reset video elements
+             localVideo.srcObject = null;
+             remoteVideo.srcObject = null;
+
+             // Reset state variables (critical!)
+             const previouslyActive = isCallActive;
+             isCallActive = false;
+             otherUserInCall = null;
+             pendingCallOffer = null;
+
+             // Hide UI elements
+             hideCallUI();
+             hideIncomingCallNotification(); // Ensure notification is hidden too
+
+             if (previouslyActive) {
+                 addSystemMessage("Call ended."); // Inform user only if call was active
+             }
+             console.log("Call cleanup complete.");
+        }
+
+        // 7. Reset call state completely (use cautiously, e.g., on login)
+        function resetCallState() {
+             console.log("Resetting call state completely...");
+             hangUpCall(false); // Clean up everything without notifying server
+        }
+
+        // 8. Handle pending offer if received before negotiation started fully
+        async function handlePendingOffer() {
+             if (!peerConnection) {
+                 console.error("Cannot handle pending offer: PeerConnection is not ready.");
+                 pendingCallOffer = null; // Discard invalid offer
+                 resetCallState();
+                 return;
+             }
+             if (!pendingCallOffer || !otherUserInCall) {
+                  console.warn("Attempted to handle pending offer, but no offer or peer found.");
+                  return; // No pending offer or state mismatch
+             }
+
+             const { offer, callerUsername } = pendingCallOffer;
+             if (callerUsername !== otherUserInCall) {
+                 console.warn("Pending offer username mismatch. Ignoring.");
+                 pendingCallOffer = null;
+                 return;
+             }
+
+             console.log("Handling pending WebRTC Offer received earlier.");
+             try {
+                 await peerConnection.setRemoteDescription(new RTCSessionDescription(offer));
+                 console.log("Pending: Remote description (offer) set. Creating answer...");
+                 const answer = await peerConnection.createAnswer();
+                 await peerConnection.setLocalDescription(answer);
+                 console.log("Pending: Local description (answer) set. Sending answer...");
+                 socket.emit('webrtc-answer', { targetUsername: otherUserInCall, answer });
+                 pendingCallOffer = null; // Clear the pending offer
+             } catch (error) {
+                 console.error("Error handling pending offer:", error);
+                 addSystemMessage("Error setting up call connection (pending offer).");
+                 hangUpCall(); // Attempt cleanup
+             }
+        }
+
+        // --- END: Video Call Helper Functions ---
+
+    </script>
+</body>
+</html>