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class ChatBot {
constructor() {
this.voiceEnabled = true;
this.isListening = false;
this.isSpeaking = false;
this.synthesis = window.speechSynthesis;
this.recognition = new (window.SpeechRecognition || window.webkitSpeechRecognition)();
this.silenceTimeout = null;
this.currentUtterance = null;
this.setupRecognition();
this.setupEventListeners();
}
setupRecognition() {
this.recognition.continuous = false;
this.recognition.interimResults = false;
this.recognition.lang = 'en-US';
this.recognition.onresult = (event) => {
const message = event.results[0][0].transcript;
this.clearInput();
this.sendMessage(message, true);
this.resetSilenceTimer();
};
this.recognition.onend = () => {
this.isListening = false;
this.toggleVoiceInputClass(false);
if (this.autoListening && !this.isSpeaking) {
this.startListening();
}
};
}
setupEventListeners() {
const messageInput = document.getElementById('messageInput');
messageInput.addEventListener('keydown', (e) => {
if (e.key === 'Enter') {
if (e.shiftKey) return;
e.preventDefault();
const message = messageInput.value.trim();
if (message) {
this.stopSpeaking();
this.stopListening();
this.sendMessage(message, false);
this.clearInput();
}
}
});
document.getElementById('sendMessage').addEventListener('click', () => {
const message = messageInput.value.trim();
if (message) {
this.stopSpeaking();
this.stopListening();
this.sendMessage(message, false);
this.clearInput();
}
});
document.getElementById('voiceInput').addEventListener('click', () => {
this.stopSpeaking();
if (this.isListening) {
this.stopListening();
} else {
this.startListening();
}
});
document.getElementById('chatMessages').addEventListener('click', () => {
if (this.isSpeaking) {
this.stopSpeaking();
}
});
}
async sendMessage(message, isVoiceInput) {
this.addMessageToChat(message, 'user');
this.showTypingIndicator();
try {
const response = await this.callAPI(message);
this.removeTypingIndicator();
this.addMessageToChat(response, 'bot');
if (this.voiceEnabled) {
this.speak(response);
}
} catch (error) {
console.error('Error:', error);
this.removeTypingIndicator();
this.addMessageToChat('Sorry, there was an error processing your request.', 'bot');
this.isListening = false;
this.toggleVoiceInputClass(false);
}
}
addMessageToChat(message, sender) {
const messagesContainer = document.getElementById('chatMessages');
const templates = document.querySelector('.message-templates');
// Clone the appropriate template
const messageTemplate = templates.querySelector(sender === 'bot' ? '.bot-message' : '.user-message').cloneNode(true);
// Set the message content
messageTemplate.querySelector('.message-content').textContent = message;
// Add speaker button for bot messages
if (sender === 'bot') {
const speakerButton = document.createElement('button');
speakerButton.className = 'message-speaker';
speakerButton.innerHTML = '<i class="fas fa-volume-up"></i>';
speakerButton.onclick = () => {
if (this.isSpeaking) {
this.stopSpeaking();
speakerButton.innerHTML = '<i class="fas fa-volume-up"></i>';
} else {
this.stopSpeaking();
this.speak(message, () => {
speakerButton.innerHTML = '<i class="fas fa-volume-up"></i>';
});
speakerButton.innerHTML = '<i class="fas fa-volume-mute"></i>';
}
};
messageTemplate.querySelector('.message-content').appendChild(speakerButton);
}
messagesContainer.appendChild(messageTemplate);
messagesContainer.scrollTop = messagesContainer.scrollHeight;
}
async callAPI(message) {
const response = await fetch('/api/chat', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({ message })
});
if (!response.ok) throw new Error('API request failed');
const data = await response.json();
return data.response;
}
showTypingIndicator() {
const indicator = document.createElement('div');
indicator.className = 'message bot typing-indicator';
indicator.innerHTML = '<div class="typing-dot"></div>'.repeat(3);
document.getElementById('chatMessages').appendChild(indicator);
}
removeTypingIndicator() {
const indicator = document.querySelector('.typing-indicator');
if (indicator) indicator.remove();
}
speak(text, onComplete = null) {
this.stopSpeaking();
this.stopListening();
const chunks = this.splitTextIntoChunks(text, 200);
let currentChunkIndex = 0;
this.isSpeaking = true;
const speakNextChunk = () => {
if (currentChunkIndex >= chunks.length) {
this.isSpeaking = false;
if (this.voiceEnabled) {
setTimeout(() => this.startListening(), 500);
}
if (onComplete) onComplete();
return;
}
const utterance = new SpeechSynthesisUtterance(chunks[currentChunkIndex]);
utterance.rate = 1;
utterance.pitch = 1;
utterance.onend = () => {
currentChunkIndex++;
if (currentChunkIndex < chunks.length) {
speakNextChunk();
} else {
this.isSpeaking = false;
if (this.voiceEnabled) {
setTimeout(() => this.startListening(), 500);
}
if (onComplete) onComplete();
}
};
utterance.onerror = (event) => {
console.error('Speech synthesis error:', event.error);
this.isSpeaking = false;
if (onComplete) onComplete();
};
this.currentUtterance = utterance;
this.synthesis.speak(utterance);
};
speakNextChunk();
}
splitTextIntoChunks(text, maxLength) {
const chunks = [];
let remainingText = text;
while (remainingText.length > 0) {
if (remainingText.length <= maxLength) {
chunks.push(remainingText);
break;
}
let chunk = remainingText.slice(0, maxLength);
let lastPeriod = chunk.lastIndexOf('.');
let lastComma = chunk.lastIndexOf(',');
let lastSpace = chunk.lastIndexOf(' ');
let breakPoint = Math.max(
lastPeriod !== -1 ? lastPeriod + 1 : -1,
lastComma !== -1 ? lastComma + 1 : -1,
lastSpace !== -1 ? lastSpace : maxLength
);
chunk = remainingText.slice(0, breakPoint);
chunks.push(chunk);
remainingText = remainingText.slice(breakPoint).trim();
}
return chunks;
}
startListening() {
if (this.isListening || this.isSpeaking) return;
try {
this.isListening = true;
this.autoListening = true;
this.toggleVoiceInputClass(true);
this.recognition.start();
this.startSilenceTimer();
} catch (error) {
console.error('Error starting recognition:', error);
this.isListening = false;
this.toggleVoiceInputClass(false);
}
}
stopListening() {
this.autoListening = false;
this.isListening = false;
this.toggleVoiceInputClass(false);
this.recognition.stop();
this.clearSilenceTimer();
}
stopSpeaking() {
if (this.isSpeaking || this.currentUtterance) {
this.synthesis.cancel();
this.currentUtterance = null;
this.isSpeaking = false;
}
}
clearInput() {
document.getElementById('messageInput').value = '';
}
toggleVoiceInputClass(isListening) {
const button = document.getElementById('voiceInput');
button.classList.toggle('listening', isListening);
}
startSilenceTimer() {
this.clearSilenceTimer();
this.silenceTimeout = setTimeout(() => {
this.stopListening();
}, 10000);
}
resetSilenceTimer() {
this.clearSilenceTimer();
this.startSilenceTimer();
}
clearSilenceTimer() {
if (this.silenceTimeout) {
clearTimeout(this.silenceTimeout);
this.silenceTimeout = null;
}
}
}
document.addEventListener('DOMContentLoaded', () => {
const chatBot = new ChatBot();
}); |