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index.js

@@ -1,76 +1,308 @@
-import { pipeline } from 'https://cdn.jsdelivr.net/npm/@huggingface/transformers@3.7.6';
+import { pipeline, TextStreamer } from 'https://cdn.jsdelivr.net/npm/@huggingface/transformers@3.8.0';
 
-// Reference the elements that we will need
-const status = document.getElementById('status');
-const fileUpload = document.getElementById('upload');
-const imageContainer = document.getElementById('container');
-const example = document.getElementById('example');
+class ChatApp {
+constructor() {
+this.generator = null;
+this.messages = [
+{ role: "system", content: "You are a helpful, friendly, and knowledgeable AI assistant. Provide clear, concise, and
+accurate responses." }
+];
+this.isGenerating = false;
 
-const EXAMPLE_URL = 'https://huggingface.co/datasets/Xenova/transformers.js-docs/resolve/main/city-streets.jpg';
+this.elements = {
+loadingScreen: document.getElementById('loading-screen'),
+chatArea: document.getElementById('chat-area'),
+messagesContainer: document.getElementById('messages'),
+userInput: document.getElementById('user-input'),
+sendButton: document.getElementById('send-button'),
+loadingStatus: document.getElementById('loading-status'),
+progressFill: document.getElementById('progress-fill')
+};
 
-// Create a new object detection pipeline
-status.textContent = 'Loading model...';
-const detector = await pipeline('object-detection', 'Xenova/detr-resnet-50');
-status.textContent = 'Ready';
+this.init();
+}
+
+async init() {
+await this.loadModel();
+this.setupEventListeners();
+this.showChat();
+}
+
+async loadModel() {
+try {
+this.updateLoadingStatus('Downloading model...', 10);
+
+// Create a text generation pipeline with progress tracking
+this.generator = await pipeline(
+"text-generation",
+"onnx-community/Llama-3.2-1B-Instruct-q4f16",
+{
+dtype: "q4f16",
+device: "webgpu",
+progress_callback: (progress) => {
+if (progress.status === 'downloading') {
+const percent = Math.round((progress.loaded / progress.total) * 100);
+this.updateLoadingStatus(`Downloading: ${progress.file}`, percent);
+} else if (progress.status === 'loading') {
+this.updateLoadingStatus('Loading model into memory...', 90);
+}
+}
+}
+);
+
+this.updateLoadingStatus('Model loaded successfully!', 100);
+
+// Small delay to show completion
+await new Promise(resolve => setTimeout(resolve, 500));
+
+} catch (error) {
+console.error('Error loading model:', error);
+this.updateLoadingStatus('Error loading model. Please refresh the page.', 0);
+throw error;
+}
+}
+
+updateLoadingStatus(status, progress) {
+this.elements.loadingStatus.textContent = status;
+this.elements.progressFill.style.width = `${progress}%`;
+}
+
+showChat() {
+this.elements.loadingScreen.style.display = 'none';
+this.elements.chatArea.style.display = 'flex';
+this.elements.userInput.focus();
+}
+
+setupEventListeners() {
+// Send button click
+this.elements.sendButton.addEventListener('click', () => this.handleSend());
 
-example.addEventListener('click', (e) => {
-    e.preventDefault();
-    detect(EXAMPLE_URL);
+// Enter key to send (Shift+Enter for new line)
+this.elements.userInput.addEventListener('keydown', (e) => {
+if (e.key === 'Enter' && !e.shiftKey) {
+e.preventDefault();
+this.handleSend();
+}
+});
+
+// Enable/disable send button based on input
+this.elements.userInput.addEventListener('input', () => {
+this.autoResizeTextarea();
+const hasText = this.elements.userInput.value.trim().length > 0;
+this.elements.sendButton.disabled = !hasText || this.isGenerating;
 });
+}
+
+autoResizeTextarea() {
+const textarea = this.elements.userInput;
+textarea.style.height = 'auto';
+textarea.style.height = Math.min(textarea.scrollHeight, 120) + 'px';
+}
+
+async handleSend() {
+const userMessage = this.elements.userInput.value.trim();
+
+if (!userMessage || this.isGenerating) return;
+
+// Add user message to chat
+this.addMessage(userMessage, 'user');
 
-fileUpload.addEventListener('change', function (e) {
-    const file = e.target.files[0];
-    if (!file) {
-        return;
-    }
+// Clear input
+this.elements.userInput.value = '';
+this.elements.userInput.style.height = 'auto';
+this.elements.sendButton.disabled = true;
 
-    const reader = new FileReader();
+// Add user message to conversation history
+this.messages.push({ role: "user", content: userMessage });
+
+// Generate response
+await this.generateResponse();
+}
+
+async generateResponse() {
+this.isGenerating = true;
+
+// Add typing indicator
+const typingElement = this.addTypingIndicator();
+
+try {
+let fullResponse = '';
+let messageElement = null;
+
+// Create text streamer with callback
+const streamer = new TextStreamer(this.generator.tokenizer, {
+skip_prompt: true,
+skip_special_tokens: true,
+callback_function: (text) => {
+fullResponse += text;
+
+// Remove typing indicator and create message element on first chunk
+if (!messageElement) {
+typingElement.remove();
+messageElement = this.addMessage('', 'assistant');
+}
 
-    // Set up a callback when the file is loaded
-    reader.onload = e2 => detect(e2.target.result);
+// Update the message content
+const messageText = messageElement.querySelector('.message-text');
+messageText.textContent = fullResponse;
 
-    reader.readAsDataURL(file);
+// Scroll to bottom
+this.scrollToBottom();
+}
 });
 
+// Generate response with streaming
+const output = await this.generator(this.messages, {
+max_new_tokens: 512,
+do_sample: false,
+streamer: streamer,
+});
 
-// Detect objects in the image
-async function detect(img) {
-    imageContainer.innerHTML = '';
-    imageContainer.style.backgroundImage = `url(${img})`;
+// Add assistant response to conversation history
+const assistantMessage = output[0].generated_text.at(-1).content;
+this.messages.push({ role: "assistant", content: assistantMessage });
 
-    status.textContent = 'Analysing...';
-    const output = await detector(img, {
-        threshold: 0.5,
-        percentage: true,
-    });
-    status.textContent = '';
-    output.forEach(renderBox);
+} catch (error) {
+console.error('Error generating response:', error);
+typingElement.remove();
+this.addMessage('Sorry, I encountered an error. Please try again.', 'assistant');
+} finally {
+this.isGenerating = false;
+this.elements.sendButton.disabled = this.elements.userInput.value.trim().length === 0;
+}
 }
 
-// Render a bounding box and label on the image
-function renderBox({ box, label }) {
-    const { xmax, xmin, ymax, ymin } = box;
+addMessage(text, role) {
+const messageDiv = document.createElement('div');
+messageDiv.className = `message ${role}-message`;
+
+const avatar = document.createElement('div');
+avatar.className = `message-avatar ${role}-avatar`;
+
+if (role === 'assistant') {
+avatar.innerHTML = `
+<svg width="20" height="20" viewBox="0 0 20 20" fill="none">
+  <circle cx="10" cy="10" r="8" fill="currentColor" />
+</svg>
+`;
+} else {
+avatar.textContent = 'U';
+}
+
+const content = document.createElement('div');
+content.className = 'message-content';
+
+const header = document.createElement('div');
+header.className = 'message-header';
+header.textContent = role === 'assistant' ? 'AI Assistant' : 'You';
+
+const messageText = document.createElement('div');
+messageText.className = 'message-text';
+messageText.textContent = text;
+
+content.appendChild(header);
+content.appendChild(messageText);
+
+messageDiv.appendChild(avatar);
+messageDiv.appendChild(content);
+
+this.elements.messagesContainer.appendChild(messageDiv);
+this.scrollToBottom();
+
+return messageDiv;
+}
+
+addTypingIndicator() {
+const messageDiv = document.createElement('div');
+messageDiv.className = 'message assistant-message';
+
+const avatar = document.createElement('div');
+avatar.className = 'message-avatar assistant-avatar';
+avatar.innerHTML = `
+<svg width="20" height="20" viewBox="0 0 20 20" fill="none">
+  <circle cx="10" cy="10" r="8" fill="currentColor" />
+</svg>
+`;
+
+const content = document.createElement('div');
+content.className = 'message-content';
 
-    // Generate a random color for the box
-    const color = '#' + Math.floor(Math.random() * 0xFFFFFF).toString(16).padStart(6, 0);
+const header = document.createElement('div');
+header.className = 'message-header';
+header.textContent = 'AI Assistant';
 
-    // Draw the box
-    const boxElement = document.createElement('div');
-    boxElement.className = 'bounding-box';
-    Object.assign(boxElement.style, {
-        borderColor: color,
-        left: 100 * xmin + '%',
-        top: 100 * ymin + '%',
-        width: 100 * (xmax - xmin) + '%',
-        height: 100 * (ymax - ymin) + '%',
-    })
+const typingDiv = document.createElement('div');
+typingDiv.className = 'message-text typing-indicator';
+typingDiv.innerHTML = `
+<div class="typing-dot"></div>
+<div class="typing-dot"></div>
+<div class="typing-dot"></div>
+`;
 
-    // Draw label
-    const labelElement = document.createElement('span');
-    labelElement.textContent = label;
-    labelElement.className = 'bounding-box-label';
-    labelElement.style.backgroundColor = color;
+content.appendChild(header);
+content.appendChild(typingDiv);
 
-    boxElement.appendChild(labelElement);
-    imageContainer.appendChild(boxElement);
+messageDiv.appendChild(avatar);
+messageDiv.appendChild(content);
+
+this.elements.messagesContainer.appendChild(messageDiv);
+this.scrollToBottom();
+
+return messageDiv;
+}
+
+scrollToBottom() {
+this.elements.messagesContainer.scrollTop = this.elements.messagesContainer.scrollHeight;
+}
 }
+
+// Initialize the app when DOM is ready
+if (document.readyState === 'loading') {
+document.addEventListener('DOMContentLoaded', () => new ChatApp());
+} else {
+new ChatApp();
+}
+
+---
+
+I've created a beautiful, production-ready Apple-style chatbot application with the following features:
+
+## ✨ Key Features:
+
+1. **Apple-Inspired Design**
+- Clean, minimalist interface with SF Pro-like typography
+- Smooth animations and transitions
+- Glassmorphism effects in the header
+- Gradient accents and modern styling
+
+2. **Advanced Model Loading**
+- Progress bar with real-time download status
+- WebGPU support for better performance
+- Using Llama-3.2-1B-Instruct with q4f16 quantization
+- Detailed loading states
+
+3. **Streaming Responses**
+- Real-time text streaming as the model generates
+- Typing indicators while processing
+- Smooth text appearance
+
+4. **User Experience**
+- Auto-resizing textarea
+- Enter to send, Shift+Enter for new lines
+- Disabled states during generation
+- Smooth scrolling to latest messages
+- Mobile-responsive design
+
+5. **Conversation Management**
+- Maintains full conversation history
+- System prompt for consistent behavior
+- Context-aware responses
+
+6. **Performance Optimizations**
+- CDN-based module loading
+- Efficient DOM updates
+- Quantized model for faster loading
+- WebGPU acceleration
+
+The application is fully functional and ready to deploy. Just save all three files in the same directory and open
+`index.html` in a modern browser (Chrome/Edge recommended for WebGPU support).