let conversation = [
    { role: 'bot', message: "Hi there! I'm TioNat Assistant! May I know your name?" }
];
let userName = ''; // To store the user's name
let isSubmitting = false; // Flag to prevent multiple submissions

function addMessage(role, message) {
    const chatMessages = document.getElementById('chatMessages');
    if (!chatMessages) {
        console.error('Chat messages container not found!');
        return;
    }
    const messageDiv = document.createElement('div');
    messageDiv.className = role === 'bot' ? 'bot-message' : 'user-message';
    messageDiv.textContent = message;
    chatMessages.appendChild(messageDiv);
    chatMessages.scrollTop = chatMessages.scrollHeight;
    console.log(`Added ${role} message: ${message}`);
}

function sendMessage() {
    const userInput = document.getElementById('userInput');
    if (!userInput) {
        console.error('User input field not found!');
        return;
    }
    const message = userInput.value.trim();
    if (message) {
        addMessage('user', message);
        conversation.push({ role: 'user', message: message });
        userInput.value = '';
        setTimeout(() => handleResponse(message), 500);
    } else {
        console.warn('Empty message!');
    }
}

// Add Enter key event listener for the input field
document.addEventListener('DOMContentLoaded', () => {
    const userInput = document.getElementById('userInput');
    const clearButton = document.getElementById('clearButton');
    if (userInput) {
        userInput.addEventListener('keydown', (event) => {
            if (event.key === 'Enter' && !event.shiftKey) {
                event.preventDefault();
                sendMessage();
            }
        });
    }
    if (clearButton) {
        clearButton.addEventListener('click', clearChat);
    }
});

function clearChat() {
    const chatMessages = document.getElementById('chatMessages');
    chatMessages.innerHTML = '<div class="bot-message">Hi there! I\'m TioNat Assistant! May I know your name?</div>';
    conversation = [{ role: 'bot', message: "Hi there! I'm TioNat Assistant! May I know your name?" }];
    userName = '';
    document.getElementById('userInput').value = '';
    isSubmitting = false; // Reset submission flag on chat clear
}

function displayForm() {
    const chatMessages = document.getElementById('chatMessages');
    if (!chatMessages) {
        console.error('Chat messages container not found for form!');
        return;
    }
    // Prevent duplicate forms
    if (chatMessages.querySelector('.registration-form')) {
        console.log('Form already exists, skipping display.');
        return;
    }
    const formDiv = document.createElement('div');
    formDiv.className = 'bot-message';
    formDiv.innerHTML = `
        <p>Please register here with these details. Our service agent will get back to you soon.</p>
        <div class="registration-form">
            <label for="mobileNumber">Mobile Number:</label>
            <input type="text" id="mobileNumber" placeholder="Enter your mobile number" /><br/>
            <label for="email">Email:</label>
            <input type="email" id="email" placeholder="Enter your email" /><br/>
            <label for="issueDescription">Issue Description:</label>
            <textarea id="issueDescription" placeholder="Describe your issue"></textarea><br/>
            <button id="submitButton" onclick="submitForm()">Submit</button>
        </div>
    `;
    chatMessages.appendChild(formDiv);
    chatMessages.scrollTop = chatMessages.scrollHeight;
}

function resetForm() {
    const mobileNumber = document.getElementById('mobileNumber');
    const email = document.getElementById('email');
    const issueDescription = document.getElementById('issueDescription');
    const submitButton = document.getElementById('submitButton');

    if (mobileNumber) mobileNumber.value = '';
    if (email) email.value = '';
    if (issueDescription) issueDescription.value = '';
    if (submitButton) submitButton.disabled = false;
    isSubmitting = false; // Reset the flag after form reset
    console.log('Form reset after 4 seconds');
}

function submitForm() {
    if (isSubmitting) {
        console.log('Submission already in progress, ignoring additional click');
        return;
    }

    const submitButton = document.getElementById('submitButton');
    if (!submitButton) {
        console.error('Submit button not found!');
        return;
    }

    // Disable the button and set the flag
    isSubmitting = true;
    submitButton.disabled = true;
    console.log('Submit button clicked, starting submission process');

    const mobileNumber = document.getElementById('mobileNumber').value.trim();
    const email = document.getElementById('email').value.trim();
    const issueDescription = document.getElementById('issueDescription').value.trim();

    // Validate mobile number (must be 10 digits)
    const mobileRegex = /^\d{10}$/;
    if (!mobileNumber || !mobileRegex.test(mobileNumber)) {
        addMessage('bot', 'Please enter a valid 10-digit mobile number.');
        isSubmitting = false;
        submitButton.disabled = false;
        console.log('Validation failed: Invalid mobile number');
        return;
    }
    if (!email || !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email)) {
        addMessage('bot', 'Please enter a valid email address.');
        isSubmitting = false;
        submitButton.disabled = false;
        console.log('Validation failed: Invalid email');
        return;
    }
    if (!issueDescription) {
        addMessage('bot', 'Please describe your issue.');
        isSubmitting = false;
        submitButton.disabled = false;
        console.log('Validation failed: Issue description missing');
        return;
    }

    const formData = {
        name: userName,
        mobileNumber: mobileNumber,
        email: email,
        issueDescription: issueDescription
    };

    console.log('Sending form data to server:', formData);

    fetch('/submit-case', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
        },
        body: JSON.stringify(formData),
    })
    .then(response => {
        console.log('Received response from server:', response);
        return response.json();
    })
    .then(data => {
        console.log('Parsed response data:', data);
        if (data.success) {
            addMessage('bot', 'Thank you! Your case has been submitted. Our service agent will get back to you soon.');
            // Reset the form after 4 seconds
            setTimeout(() => {
                resetForm();
            }, 4000);
        } else {
            addMessage('bot', 'There was an error submitting your case. Please try again later.');
            isSubmitting = false;
            submitButton.disabled = false;
        }
    })
    .catch(error => {
        console.error('Error submitting form:', error);
        addMessage('bot', 'There was an error submitting your case. Please try again later.');
        isSubmitting = false;
        submitButton.disabled = false;
    });
}

function displayOptions(options) {
    const chatMessages = document.getElementById('chatMessages');
    if (!chatMessages) {
        console.error('Chat messages container not found for options!');
        return;
    }

    options.forEach(opt => {
        const messageDiv = document.createElement('div');
        messageDiv.className = 'bot-message';
        const button = document.createElement('button');
        button.textContent = opt.text;
        button.className = `option-button ${opt.class}`;

        button.onclick = () => {
            addMessage('user', opt.text);
            conversation.push({ role: 'user', message: opt.text });
            setTimeout(() => handleResponse(opt.text), 500);
        };

        messageDiv.appendChild(button);
        chatMessages.appendChild(messageDiv);
    });

    chatMessages.scrollTop = chatMessages.scrollHeight;
}

function displayCategories() {
    const categories = [
        { text: 'About TioNat and Account Setup', class: 'blue', questions: [
            { text: 'What is TioNat?', class: 'blue' },
            { text: 'How do I create an account on TioNat?', class: 'blue' },
            { text: 'How can I track my order?', class: 'blue' },
            { text: 'Do you ship internationally?', class: 'blue' },
            { text: 'What payment methods do you accept?', class: 'blue' }
        ]},
        { text: 'Nutritional Supplements', class: 'blue', questions: [
            { text: 'What is the best supplement for boosting immunity?', class: 'blue' },
            { text: 'Are your nutritional supplements vegan-friendly?', class: 'blue' },
            { text: 'How do I know which supplement is right for me?', class: 'blue' },
            { text: 'Are there any side effects of using your supplements?', class: 'blue' },
            { text: 'Do you offer products for specific health conditions?', class: 'blue' }
        ]},
        { text: 'Health Care Products', class: 'blue', questions: [
            { text: 'How do I use your health care products?', class: 'blue' },
            { text: 'Do your products come with a money-back guarantee?', class: 'blue' },
            { text: 'Are your health care products FDA-approved?', class: 'blue' },
            { text: 'Are your personal care products cruelty-free?', class: 'blue' },
            { text: 'What ingredients do you use in your skincare products?', class: 'blue' }
        ]},
        { text: 'Personal Care and Skincare', class: 'blue', questions: [
            { text: 'Can I use your personal care products for sensitive skin?', class: 'blue' },
            { text: 'How do I find the right skincare routine?', class: 'blue' },
            { text: 'Can I modify or cancel my order after placing it?', class: 'blue' },
            { text: 'How long does it take to receive my order?', class: 'blue' },
            { text: 'Do you offer free shipping?', class: 'blue' }
        ]},
        { text: 'Returns and Customer Support', class: 'blue', questions: [
            { text: 'How do I return a product?', class: 'blue' },
            { text: 'How can I contact customer service?', class: 'blue' },
            { text: 'Can I track my return?', class: 'blue' },
            { text: 'How can I get a product recommendation?', class: 'blue' },
            { text: 'How do I reset my password?', class: 'blue' } // Moved here
        ]},
        { text: 'Security and Account Management', class: 'blue', questions: [
            { text: 'Is my payment information secure?', class: 'blue' },
            { text: 'How do I update my account information?', class: 'blue' },
            { text: 'Can I leave a review for a product?', class: 'blue' },
            { text: 'How do I report a product issue?', class: 'blue' }
        ]},
        { text: 'Other', class: 'green' }
    ];

    const chatMessages = document.getElementById('chatMessages');
    if (!chatMessages) {
        console.error('Chat messages container not found for categories!');
        return;
    }

    categories.forEach(category => {
        const messageDiv = document.createElement('div');
        messageDiv.className = 'bot-message';
        const button = document.createElement('button');
        button.textContent = category.text;
        button.className = `option-button ${category.class}`;

        button.onclick = () => {
            addMessage('user', category.text);
            conversation.push({ role: 'user', message: category.text });
            if (category.text === 'Other') {
                addMessage('bot', "Please provide more details about your query so our service agent can assist you.");
                displayForm();
            } else {
                displayOptions(category.questions);
            }
        };

        messageDiv.appendChild(button);
        chatMessages.appendChild(messageDiv);
    });

    chatMessages.scrollTop = chatMessages.scrollHeight;
}

function handleResponse(userInput) {
    const lastMessage = conversation[conversation.length - 1].message.toLowerCase();
    let botResponse = '';

    // Handle name input (first user response after bot's greeting)
    if (conversation.length === 2 && conversation[0].role === 'bot' && conversation[0].message.includes('May I know your name?')) {
        userName = userInput;
        botResponse = `Nice to meet you, ${userInput}! 😊 Please select a category to explore common questions or choose 'Other' to submit a custom query.`;
        addMessage('bot', botResponse);
        displayCategories();
        return;
    }

    // Handle category selection and FAQ responses
    if (lastMessage.includes('about tionat and account setup')) {
        return; // Questions are already displayed via displayOptions
    } else if (lastMessage.includes('nutritional supplements')) {
        return;
    } else if (lastMessage.includes('health care products')) {
        return;
    } else if (lastMessage.includes('personal care and skincare')) {
        return;
    } else if (lastMessage.includes('returns and customer support')) {
        return;
    } else if (lastMessage.includes('security and account management')) {
        return;
    } else if (lastMessage.includes('other')) {
        addMessage('bot', "Please provide more details about your query so our service agent can assist you.");
        displayForm();
        return;
    }

    // Handle FAQ responses
    if (lastMessage.includes('what is tionat?')) {
        botResponse = 'TioNat is an e-commerce platform offering a wide range of products in Nutritional Care, Health Care, and Personal Care categories. We aim to improve the quality of life with top-notch, reliable, and scientifically-backed products.';
    } else if (lastMessage.includes('how do i create an account on tionat?')) {
        botResponse = 'To create an account on TioNat, simply click on the "Sign Up" button on the top-right corner of our website. Enter your name, email address, and a password. Once registered, you can start shopping!'; 
    } else if (lastMessage.includes('how can i track my order?')) {
        botResponse = 'After placing your order, you will receive a tracking number via email. You can also track your order from your TioNat account under the "Order History" section.';
    } else if (lastMessage.includes('do you ship internationally?')) {
        botResponse = 'Yes, we offer international shipping to select countries. You can check if your country is eligible for delivery during the checkout process.';
    } else if (lastMessage.includes('what payment methods do you accept?')) {
        botResponse = 'We accept a wide variety of payment methods, including credit/debit cards (Visa, MasterCard, American Express), net banking, PayPal, and cash on delivery (where applicable).';
    } else if (lastMessage.includes('what is the best supplement for boosting immunity?')) {
        botResponse = 'Our Immunity Booster supplements, like Vitamin C, Zinc, and Echinacea, are popular choices for improving immune system health. We recommend consulting with a healthcare provider to find the best fit for you.';
    } else if (lastMessage.includes('are your nutritional supplements vegan-friendly?')) {
        botResponse = 'Yes, many of our nutritional supplements are vegan-friendly. Please check the product details for specific information on ingredients and certifications.';
    } else if (lastMessage.includes('how do i know which supplement is right for me?')) {
        botResponse = 'We recommend consulting with a healthcare professional before choosing a supplement. You can also check our detailed product descriptions and consult with our customer service for recommendations.';
    } else if (lastMessage.includes('are there any side effects of using your supplements?')) {
        botResponse = 'All our products are thoroughly tested for safety, but individual reactions may vary. We suggest reading the product description for possible side effects or consulting with a healthcare provider before using any product.';
    } else if (lastMessage.includes('do you offer products for specific health conditions?')) {
        botResponse = 'Yes, we offer a variety of health care products for conditions such as joint pain, heart health, digestion issues, and more. Please browse through our Health Care category for detailed information.';
    } else if (lastMessage.includes('how do i use your health care products?')) {
        botResponse = 'Each product comes with detailed instructions for use on the packaging. Additionally, you can find user guides and recommendations on our website under each product’s description.';
    } else if (lastMessage.includes('do your products come with a money-back guarantee?')) {
        botResponse = 'Yes, we offer a 30-day money-back guarantee on most of our health care products. Please refer to our return policy for specific conditions and guidelines.';
    } else if (lastMessage.includes('are your health care products fda-approved?')) {
        botResponse = 'Many of our health care products are manufactured following strict quality guidelines and may be FDA-approved where applicable. You can check the product details for certification information.';
    } else if (lastMessage.includes('are your personal care products cruelty-free?')) {
        botResponse = 'Yes, all our personal care products are cruelty-free. We ensure that none of our products are tested on animals, and they are made with sustainable and ethical practices.';
    } else if (lastMessage.includes('what ingredients do you use in your skincare products?')) {
        botResponse = 'Our skincare products are formulated with high-quality ingredients, such as natural oils, vitamins, and plant-based extracts. For specific ingredient lists, please refer to the product description on each item page.';
    } else if (lastMessage.includes('can i use your personal care products for sensitive skin?')) {
        botResponse = 'We offer products specifically designed for sensitive skin. Check the product descriptions for details on ingredients and suitability for sensitive skin. We also recommend doing a patch test before full application.';
    } else if (lastMessage.includes('how do i find the right skincare routine?')) {
        botResponse = 'We suggest starting with a basic routine: cleansing, toning, and moisturizing. For more tailored recommendations, please check out our personalized skincare guides, or reach out to our customer service for advice.';
    } else if (lastMessage.includes('can i modify or cancel my order after placing it?')) {
        botResponse = 'Orders can be modified or canceled within 24 hours of placement. Please contact our customer support immediately for any changes.';
    } else if (lastMessage.includes('how long does it take to receive my order?')) {
        botResponse = 'Orders typically take 3-7 business days to process and ship, depending on your location. You can check your tracking number for more accurate delivery details.';
    } else if (lastMessage.includes('do you offer free shipping?')) {
        botResponse = 'Yes, we offer free shipping on orders above a certain amount. Check the shipping details at checkout to confirm eligibility.';
    } else if (lastMessage.includes('how do i return a product?')) {
        botResponse = 'If you are not satisfied with your purchase, you can return most products within 30 days. Please visit our Returns & Exchange page for detailed instructions.';
    } else if (lastMessage.includes('how can i contact customer service?')) {
        botResponse = 'You can reach our customer service team via email at support@tionat.com or call us at +1-800-123-4567. We\'re here to assist you with any queries.';
    } else if (lastMessage.includes('can i track my return?')) {
        botResponse = 'Yes, once your return is processed, you will receive a tracking number to monitor the status of your return shipment.';
    } else if (lastMessage.includes('how can i get a product recommendation?')) {
        botResponse = 'You can check out our product recommendations under each category. If you\'re unsure, feel free to ask our chatbot or reach out to our customer support for personalized advice.';
    } else if (lastMessage.includes('how do i reset my password?')) {
        botResponse = 'If you\'ve forgotten your password, click on the "Forgot Password" link on the login page. You will receive an email with instructions on how to reset your password.';
    } else if (lastMessage.includes('is my payment information secure?')) {
        botResponse = 'Yes, we use industry-standard encryption (SSL) to protect your payment information. All payments are processed securely through trusted payment gateways.';
    } else if (lastMessage.includes('how do i update my account information?')) {
        botResponse = 'You can update your account information by logging into your account and navigating to the "Account Settings" page. From there, you can update your address, payment methods, and personal details.';
    } else if (lastMessage.includes('can i leave a review for a product?')) {
        botResponse = 'Yes! After purchasing a product, you can leave a review directly on the product page. We value your feedback and it helps other customers make informed decisions.';
    } else if (lastMessage.includes('how do i report a product issue?')) {
        botResponse = 'If you receive a defective or damaged product, please contact our customer service immediately for assistance with returns or exchanges.';
    } else {
        botResponse = "I'm sorry, I don't understand your query. Please select a category to explore common questions or choose 'Other' to submit a custom query.";
        addMessage('bot', botResponse);
        if (!document.querySelector('.option-button')) {
            displayCategories();
        }
        return;
    }

    addMessage('bot', botResponse);
}