let conversation = [
    { role: 'bot', message: "Hi there! I'm Chat Bot! May I know your name?" }
];
let userName = ''; // To store the user's name

// Reset conversation on page load
document.addEventListener('DOMContentLoaded', () => {
    conversation = [
        { role: 'bot', message: "Hi there! I'm Chat Bot! May I know your name?" }
    ];
    const chatMessages = document.getElementById('chatMessages');
    if (chatMessages) {
        chatMessages.innerHTML = '';
        addMessage('bot', "Hi there! I'm Chat Bot! May I know your name?");
    }
    console.log('Page loaded, conversation reset:', conversation);
});

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}`);
    console.log('Current conversation:', conversation);
}

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(() => {
            try {
                handleResponse(message);
            } catch (error) {
                console.error('Error in handleResponse:', error);
                addMessage('bot', 'Sorry, something went wrong. Please try again.');
            }
        }, 500);
    } else {
        console.warn('Empty message!');
    }
}

// Add Enter key event listener for the input field
document.addEventListener('DOMContentLoaded', () => {
    const userInput = document.getElementById('userInput');
    if (userInput) {
        userInput.addEventListener('keydown', (event) => {
            if (event.key === 'Enter' && !event.shiftKey) {
                event.preventDefault(); // Prevent default behavior (e.g., form submission)
                sendMessage();
            }
        });
    } else {
        console.error('User input field not found during initialization!');
    }
});

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 onclick="submitForm()">Submit</button>
        </div>
    `;
    chatMessages.appendChild(formDiv);
    chatMessages.scrollTop = chatMessages.scrollHeight;
    console.log('Form displayed successfully.');
}

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

    if (!mobileNumber || !email || !issueDescription) {
        addMessage('bot', 'Please fill in all fields before submitting.');
        return;
    }

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

    fetch('/submit-case', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
        },
        body: JSON.stringify(formData),
    })
    .then(response => response.json())
    .then(data => {
        if (data.success) {
            addMessage('bot', 'Thank you! Your case has been submitted. Our service agent will get back to you soon.');
        } else {
            addMessage('bot', 'There was an error submitting your case. Please try again later.');
        }
    })
    .catch(error => {
        console.error('Error submitting form:', error);
        addMessage('bot', 'There was an error submitting your case. Please try again later.');
    });
}

function clearOptions() {
    const chatMessages = document.getElementById('chatMessages');
    if (!chatMessages) return;
    const optionButtons = chatMessages.querySelectorAll('.bot-message .option-button');
    console.log(`Clearing ${optionButtons.length} existing option buttons.`);
    optionButtons.forEach(button => {
        if (button.parentElement) {
            button.parentElement.remove();
        }
    });
    // Log the current DOM state after clearing
    console.log('DOM after clearing options:', chatMessages.innerHTML);
}

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

    // Clear existing options before displaying new ones
    clearOptions();

    console.log(`Displaying ${options.length} options:`, options);
    options.forEach((opt, index) => {
        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.addEventListener('click', () => {
            console.log(`Button clicked: ${opt.text}`);
            addMessage('user', opt.text);
            conversation.push({ role: 'user', message: opt.text });
            setTimeout(() => {
                try {
                    handleResponse(opt.text);
                } catch (error) {
                    console.error('Error in handleResponse after button click:', error);
                    addMessage('bot', 'Sorry, something went wrong. Please try again.');
                }
            }, 500);
        });

        messageDiv.appendChild(button);
        chatMessages.appendChild(messageDiv);
        console.log(`Added button ${index + 1}: ${opt.text}`);
    });

    chatMessages.scrollTop = chatMessages.scrollHeight;
    // Log the DOM state after adding options
    console.log('DOM after adding options:', chatMessages.innerHTML);
}

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

    // Define categories
    const categories = [
        { text: 'About TioNat and Account Setup', class: 'blue' },
        { text: 'Nutritional Supplements', class: 'blue' },
        { text: 'Health Care Products', class: 'blue' },
        { text: 'Personal Care and Skincare', class: 'blue' },
        { text: 'Returns and Customer Support', class: 'blue' },
        { text: 'Security and Account Management', class: 'blue' },
        { text: 'Other', class: 'green' }
    ];

    // 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; // Store the user's name
        botResponse = `Nice to meet you, ${userInput}! 😊 Please select a category for your query:`;
        addMessage('bot', botResponse);
        displayOptions(categories, true); // Display category buttons
        return;
    }

    // Handle category selection
    if (categories.some(cat => cat.text.toLowerCase() === lastMessage)) {
        botResponse = `Thank you for selecting "${userInput}". Please provide more details about your query so our service agent can assist you.`;
        addMessage('bot', botResponse);
        displayForm();
        return;
    }

    // Handle unrecognized input
    botResponse = "I'm sorry, I don't understand your query. Please select a category for your query:";
    addMessage('bot', botResponse);
    if (!document.querySelector('.option-button')) {
        displayOptions(categories, true);
    }
}