// Universal AI Chatbot Script
    const chatbotToggle = document.getElementById('chatbot-toggle');
    const chatbotWindow = document.getElementById('chatbot-window');
    const chatbotSend = document.getElementById('chatbot-send');
    const chatbotInput = document.getElementById('chatbot-input');
    const chatbotMessages = document.getElementById('chatbot-messages');
    const API_ENDPOINT = 'chatbot-answer.php'; // Update as needed

    let isLoading = false;
    let chatInitialized = false;
    let chatSessionId = null; // Unique ID for the chat session

    // Initialize chat session ID on page load
    document.addEventListener('DOMContentLoaded', () => {
    // Generate or retrieve chat_session_id
    chatSessionId = getCookie('chat_session_id') || generateChatSessionId();
    setCookie('chat_session_id', chatSessionId, 1); // Store for 1 day

    setTimeout(() => {
        if (!chatInitialized) {
        appendMessage('Bot', 'Hello! How may I assist you today?', 'bot');
        chatInitialized = true;
        }
    }, 1000);
    });

    // Function to generate a unique chat session ID
    function generateChatSessionId() {
    return 'chat_' + Math.random().toString(36).substr(2, 9) + '_' + Date.now();
    }

    // Cookie handling functions
    function setCookie(name, value, days = 1) {
    const expires = new Date(Date.now() + days * 864e5).toUTCString();
    document.cookie = name + '=' + encodeURIComponent(value) + '; expires=' + expires + '; path=/';
    }

    function getCookie(name) {
    return document.cookie.split('; ').reduce((r, v) => {
        const parts = v.split('=');
        return parts[0] === name ? decodeURIComponent(parts[1]) : r;
    }, '');
    }

    chatbotToggle.onclick = () => {
    chatbotWindow.style.display = chatbotWindow.style.display === 'block' ? 'none' : 'block';
    };

    chatbotSend.onclick = sendMessage;
    chatbotInput.addEventListener('keydown', function(e) {
    if (e.key === 'Enter') sendMessage();
    });

    let previousUserMessage = '';
    let answerdata = '';

    function sendMessage() {
    const msg = chatbotInput.value.trim();
    if (!msg) return;
    appendMessage('You', msg, 'user');
    chatbotInput.value = '';

    // Detect slot navigation and set cookie
    if (/next slot/i.test(msg)) {
        let page = parseInt(getCookie('slot_page') || '0', 10);
        setCookie('slot_page', page + 1);
    } else if (/(book|schedule|want|arrange|need|require|organize|plan|set|line up|organize).*demo/i.test(msg)) {
        setCookie('slot_page', 0);
    }

    appendMessage('Bot', 'Writing...', 'bot');
    addMessageToTranscript('user', msg);
    resetInactivityTimer();

    // Prepare request data
    const requestData = {
        question: msg,
        lastUserMsg: previousUserMessage,
        slot_page: getCookie('slot_page'),
        slot_data: getCookie('slot_data'),
        chat_session_id: chatSessionId, // Include chat session ID
        client_id: 'MzY=',
        booking_session_id: getCookie('booking_session_id') || '' // Include booking session ID if available
    };

    // Handle slot number selection
    if (/^\d{1,4}$/.test(msg.trim())) {
        try {
        console.log('=== Slot Selection Debug ===');
        const lastResponse = JSON.parse(localStorage.getItem('last_slot_response') || '{}');
        
        if (lastResponse && lastResponse.slots && Array.isArray(lastResponse.slots)) {
            console.log('Sending slots to server:', lastResponse.slots);
            requestData.slot_number = parseInt(msg.trim(), 10);
            requestData.displayedSlots = JSON.stringify(lastResponse.slots);
            if (lastResponse.selected_date) {
            requestData.selected_date = lastResponse.selected_date;
            }
            if (lastResponse.slot_page !== undefined) {
            requestData.slot_page = lastResponse.slot_page;
            }
            console.log('Slot data prepared for sending:', {
            slot_number: requestData.slot_number,
            slots: lastResponse.slots.length,
            selected_date: requestData.selected_date,
            slot_page: requestData.slot_page,
            chat_session_id: requestData.chat_session_id,
            booking_session_id: requestData.booking_session_id,
            client_id: 'MzY='
            });
        } else {
            console.warn('No valid slots found in last response');
        }
        } catch (e) {
        console.error('Error handling slot selection:', e);
        }
    }

    fetch(API_ENDPOINT, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(requestData)
    })
    .then(res => res.json())
    .then(data => {
        chatbotMessages.removeChild(chatbotMessages.lastChild);
        appendMessage('Bot', data.answer ? data.answer : 'No answer found.', 'bot');
        addMessageToTranscript('Bot', data.answer ? data.answer : 'No answer found.');
        answerdata += '+' + data.answer;

        // Store booking_session_id if provided
        if (data.booking_session_id) {
        setCookie('booking_session_id', data.booking_session_id, 1);
        }
        if (data.slot_data) {
        setCookie('slot_data', data.slot_data);
        }
        // Store slot response
        if (data.slots && Array.isArray(data.slots)) {
        console.log('=== Storing Slots Data ===');
        const responseData = {
            slots: data.slots,
            timestamp: new Date().toISOString()
        };
        if (data.selected_date !== undefined) {
            responseData.selected_date = data.selected_date;
        }
        if (data.slot_page !== undefined) {
            responseData.slot_page = data.slot_page;
        }
        try {
            localStorage.setItem('last_slot_response', JSON.stringify(responseData));
            console.log('Stored slot data in localStorage:', {
            slots: responseData.slots.length,
            selected_date: responseData.selected_date,
            slot_page: responseData.slot_page
            });
        } catch (e) {
            console.error('Error storing slot data:', e);
        }
        }
    })
    .catch(() => {
        chatbotMessages.removeChild(chatbotMessages.lastChild);
        appendMessage('Bot', 'Sorry, there was an error getting the answer.', 'bot');
        addMessageToTranscript('Bot', 'Sorry, there was an error getting the answer.');
    });
    previousUserMessage += '+' + msg;
    if (/(bye|goodbye|thank you|thanks|see you)/i.test(msg)) {
        endChat();
    }
    resetInactivityTimer();
    }

    // --- Chat Transcript and End Chat Logic ---
    let chatTranscript = [];
    let inactivityTimer = null;
    const INACTIVITY_LIMIT = 10 * 60 * 1000; // 10 minutes

    function addMessageToTranscript(sender, message) {
    chatTranscript.push({ sender, message });
    }

    function resetInactivityTimer() {
    if (inactivityTimer) clearTimeout(inactivityTimer);
    inactivityTimer = setTimeout(() => {
        console.log("Inactivity timeout");
        endChat();
    }, INACTIVITY_LIMIT);
    }

    function endChat() {
    if (chatTranscript.length === 0) return;
    const payload = JSON.stringify({
        action: 'end_chat',
        transcript: chatTranscript,
        chat_session_id: chatSessionId, // Include chat session ID
        client_id: 'MzY=',
        booking_session_id: getCookie('booking_session_id') || '' // Include booking session ID
    });
    if (navigator.sendBeacon) {
        const blob = new Blob([payload], { type: 'application/json' });
        navigator.sendBeacon(API_ENDPOINT, blob);
    } else {
        fetch(API_ENDPOINT, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: payload
        });// Universal AI Chatbot Script
    const chatbotToggle = document.getElementById('chatbot-toggle');
    const chatbotWindow = document.getElementById('chatbot-window');
    const chatbotSend = document.getElementById('chatbot-send');
    const chatbotInput = document.getElementById('chatbot-input');
    const chatbotMessages = document.getElementById('chatbot-messages');
    const API_ENDPOINT = 'chatbot-answer-new.php'; // Update as needed

    let isLoading = false;
    let chatInitialized = false;
    let chatSessionId = null; // Unique ID for the chat session

    // Initialize chat session ID on page load
    document.addEventListener('DOMContentLoaded', () => {
    // Generate or retrieve chat_session_id
    chatSessionId = getCookie('chat_session_id') || generateChatSessionId();
    setCookie('chat_session_id', chatSessionId, 1); // Store for 1 day

    setTimeout(() => {
        if (!chatInitialized) {
        appendMessage('Bot', 'Hello! How may I assist you today?', 'bot');
        chatInitialized = true;
        }
    }, 1000);
    });

    // Function to generate a unique chat session ID
    function generateChatSessionId() {
    return 'chat_' + Math.random().toString(36).substr(2, 9) + '_' + Date.now();
    }

    // Cookie handling functions
    function setCookie(name, value, days = 1) {
    const expires = new Date(Date.now() + days * 864e5).toUTCString();
    document.cookie = name + '=' + encodeURIComponent(value) + '; expires=' + expires + '; path=/';
    }

    function getCookie(name) {
    return document.cookie.split('; ').reduce((r, v) => {
        const parts = v.split('=');
        return parts[0] === name ? decodeURIComponent(parts[1]) : r;
    }, '');
    }

    chatbotToggle.onclick = () => {
    chatbotWindow.style.display = chatbotWindow.style.display === 'block' ? 'none' : 'block';
    };

    chatbotSend.onclick = sendMessage;
    chatbotInput.addEventListener('keydown', function(e) {
    if (e.key === 'Enter') sendMessage();
    });

    let previousUserMessage = '';
    let answerdata = '';

    function sendMessage() {
    const msg = chatbotInput.value.trim();
    if (!msg) return;
    appendMessage('You', msg, 'user');
    chatbotInput.value = '';

    // Detect slot navigation and set cookie
    if (/next slot/i.test(msg)) {
        let page = parseInt(getCookie('slot_page') || '0', 10);
        setCookie('slot_page', page + 1);
    } else if (/(book|schedule|want|arrange|need|require|organize|plan|set|line up|organize).*demo/i.test(msg)) {
        setCookie('slot_page', 0);
    }

    appendMessage('Bot', 'Writing...', 'bot');
    addMessageToTranscript('user', msg);
    resetInactivityTimer();

    // Prepare request data
    const requestData = {
        question: msg,
        lastUserMsg: previousUserMessage,
        slot_page: getCookie('slot_page'),
        slot_data: getCookie('slot_data'),
        chat_session_id: chatSessionId, // Include chat session ID
        client_id: 'MzY=',
        booking_session_id: getCookie('booking_session_id') || '' // Include booking session ID if available
    };

    // Handle slot number selection
    if (/^\d{1,4}$/.test(msg.trim())) {
        try {
        console.log('=== Slot Selection Debug ===');
        const lastResponse = JSON.parse(localStorage.getItem('last_slot_response') || '{}');
        
        if (lastResponse && lastResponse.slots && Array.isArray(lastResponse.slots)) {
            console.log('Sending slots to server:', lastResponse.slots);
            requestData.slot_number = parseInt(msg.trim(), 10);
            requestData.displayedSlots = JSON.stringify(lastResponse.slots);
            if (lastResponse.selected_date) {
            requestData.selected_date = lastResponse.selected_date;
            }
            if (lastResponse.slot_page !== undefined) {
            requestData.slot_page = lastResponse.slot_page;
            }
            console.log('Slot data prepared for sending:', {
            slot_number: requestData.slot_number,
            slots: lastResponse.slots.length,
            selected_date: requestData.selected_date,
            slot_page: requestData.slot_page,
            chat_session_id: requestData.chat_session_id,
            booking_session_id: requestData.booking_session_id,
            client_id: 'MzY='
            });
        } else {
            console.warn('No valid slots found in last response');
        }
        } catch (e) {
        console.error('Error handling slot selection:', e);
        }
    }

    fetch(API_ENDPOINT, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(requestData)
    })
    .then(res => res.json())
    .then(data => {
        chatbotMessages.removeChild(chatbotMessages.lastChild);
        appendMessage('Bot', data.answer ? data.answer : 'No answer found.', 'bot');
        addMessageToTranscript('Bot', data.answer ? data.answer : 'No answer found.');
        answerdata += '+' + data.answer;

        // Store booking_session_id if provided
        if (data.booking_session_id) {
        setCookie('booking_session_id', data.booking_session_id, 1);
        }
        if (data.slot_data) {
        setCookie('slot_data', data.slot_data);
        }
        // Store slot response
        if (data.slots && Array.isArray(data.slots)) {
        console.log('=== Storing Slots Data ===');
        const responseData = {
            slots: data.slots,
            timestamp: new Date().toISOString()
        };
        if (data.selected_date !== undefined) {
            responseData.selected_date = data.selected_date;
        }
        if (data.slot_page !== undefined) {
            responseData.slot_page = data.slot_page;
        }
        try {
            localStorage.setItem('last_slot_response', JSON.stringify(responseData));
            console.log('Stored slot data in localStorage:', {
            slots: responseData.slots.length,
            selected_date: responseData.selected_date,
            slot_page: responseData.slot_page
            });
        } catch (e) {
            console.error('Error storing slot data:', e);
        }
        }
    })
    .catch(() => {
        chatbotMessages.removeChild(chatbotMessages.lastChild);
        appendMessage('Bot', 'Sorry, there was an error getting the answer.', 'bot');
        addMessageToTranscript('Bot', 'Sorry, there was an error getting the answer.');
    });
    previousUserMessage += '+' + msg;
    if (/(bye|goodbye|thank you|thanks|see you)/i.test(msg)) {
        endChat();
    }
    resetInactivityTimer();
    }

    // --- Chat Transcript and End Chat Logic ---
    let chatTranscript = [];
    let inactivityTimer = null;
    const INACTIVITY_LIMIT = 10 * 60 * 1000; // 10 minutes

    function addMessageToTranscript(sender, message) {
    chatTranscript.push({ sender, message });
    }

    function resetInactivityTimer() {
    if (inactivityTimer) clearTimeout(inactivityTimer);
    inactivityTimer = setTimeout(() => {
        console.log("Inactivity timeout");
        endChat();
    }, INACTIVITY_LIMIT);
    }

    function endChat() {
        if (chatTranscript.length === 0) return;
        const payload = JSON.stringify({
            action: 'end_chat',
            transcript: chatTranscript,
            chat_session_id: chatSessionId, // Include chat session ID
            client_id: 'MzY=',
            booking_session_id: getCookie('booking_session_id') || '' // Include booking session ID
        });
        if (navigator.sendBeacon) {
            const blob = new Blob([payload], { type: 'application/json' });
            navigator.sendBeacon(API_ENDPOINT, blob);
        } else {
            fetch(API_ENDPOINT, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: payload
            });
        }
        chatTranscript = [];
        if (inactivityTimer) clearTimeout(inactivityTimer);
            // Clear booking_session_id but keep chat_session_id for potential new chats
            setCookie('booking_session_id', '', -1);
        }

        window.addEventListener('beforeunload', function() {
            endChat();
        });

        function linkify(text) {
            return text.replace(/(https?:\/\/[^\s]+)/g, '<a href="$1" target="_blank" rel="noopener">$1</a>');
        }
       function appendMessage(sender, text, type) {
            const msgDiv = document.createElement('div');
            msgDiv.className = 'chatbot-msg' + (type === 'user' ? ' user' : '');
            msgDiv.innerHTML = '<strong>' + sender + ':</strong> ' + ((type === 'bot') ? linkify(text) : text);
            chatbotMessages.appendChild(msgDiv);
            chatbotMessages.scrollTop = chatbotMessages.scrollHeight;
        }
    }
     chatTranscript = [];
        if (inactivityTimer) clearTimeout(inactivityTimer);
        // Clear booking_session_id but keep chat_session_id for potential new chats
        setCookie('booking_session_id', '', -1);
        }

        window.addEventListener('beforeunload', function() {
        endChat();
        });

        function linkify(text) {
        return text.replace(/(https?:\/\/[^\s]+)/g, '<a href="$1" target="_blank" rel="noopener">$1</a>');
        }

        function appendMessage(sender, text, type) {
        const msgDiv = document.createElement('div');
        msgDiv.className = 'chatbot-msg' + (type === 'user' ? ' user' : '');
        msgDiv.innerHTML = '<strong>' + sender + ':</strong> ' + ((type === 'bot') ? linkify(text) : text);
        chatbotMessages.appendChild(msgDiv);
        chatbotMessages.scrollTop = chatbotMessages.scrollHeight;
        }