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document.addEventListener('DOMContentLoaded', () => {
    // Starry Background Animation
    const stars = document.createElement('canvas');
    stars.className = 'stars';
    document.body.appendChild(stars);
    const ctx = stars.getContext('2d');
    stars.width = window.innerWidth;
    stars.height = window.innerHeight;
    const starArray = [];
    for (let i = 0; i < 100; i++) {
        starArray.push({
            x: Math.random() * stars.width,
            y: Math.random() * stars.height,
            radius: Math.random() * 2,
            opacity: Math.random()
        });
    }
    function animateStars() {
        ctx.clearRect(0, 0, stars.width, stars.height);
        starArray.forEach(star => {
            ctx.beginPath();
            ctx.arc(star.x, star.y, star.radius, 0, Math.PI * 2);
            ctx.fillStyle = `rgba(255, 255, 255, ${star.opacity})`;
            ctx.fill();
            star.opacity += (Math.random() - 0.5) * 0.05;
            if (star.opacity > 1) star.opacity = 1;
            if (star.opacity < 0) star.opacity = 0;
        });
        requestAnimationFrame(animateStars);
    }
    animateStars();

    // Card Hover Effects
    const cards = document.querySelectorAll(".card");
    cards.forEach(card => {
        card.addEventListener("mouseenter", () => {
            if (!card.classList.contains('shadowed')) {
                card.style.transition = "transform 0.4s ease-in-out";
                card.style.transform = "scale(1.05) rotate(0.5deg)";
            }
        });
        card.addEventListener("mouseleave", () => {
            if (!card.classList.contains('shadowed')) {
                card.style.transform = "scale(1) rotate(0deg)";
            }
        });
    });

    // Window Resize Handler for Canvas
    window.addEventListener('resize', () => {
        stars.width = window.innerWidth;
        stars.height = window.innerHeight;
        starArray.length = 0;
        for (let i = 0; i < 100; i++) {
            starArray.push({
                x: Math.random() * stars.width,
                y: Math.random() * stars.height,
                radius: Math.random() * 2,
                opacity: Math.random()
            });
        }
    });

    // Box Click to Open Modal
    document.querySelectorAll('.function-box').forEach(box => {
        box.addEventListener('click', () => {
            const modalId = box.dataset.modal;
            document.getElementById(modalId).classList.remove('hidden');
            // Dim other function-box elements
            document.querySelectorAll('.function-box').forEach(otherBox => {
                if (otherBox !== box) {
                    otherBox.classList.add('shadowed');
                }
            });
        });
    });

    // Chatbot Icon Click
    document.querySelector('.chatbot-icon').addEventListener('click', () => {
        document.getElementById('chatbot-modal').classList.remove('hidden');
    });

    // Close Modal
    document.querySelectorAll('.close-modal').forEach(closeBtn => {
        closeBtn.addEventListener('click', () => {
            closeBtn.closest('.modal').classList.add('hidden');
            // Reset forms and responses
            const forms = closeBtn.closest('.modal').querySelectorAll('form');
            forms.forEach(form => form.reset());
            const responseCards = closeBtn.closest('.modal').querySelectorAll('.response-card');
            responseCards.forEach(card => {
                card.classList.add('hidden');
                card.innerHTML = '';
            });
            const spinners = closeBtn.closest('.modal').querySelectorAll('.loading-spinner');
            spinners.forEach(spinner => spinner.classList.add('hidden'));
            const dropAreas = closeBtn.closest('.modal').querySelectorAll('.drop-area p');
            dropAreas.forEach(p => p.textContent = 'Drop File Here or Click to Choose');
            // Clear chatbot conversation
            if (closeBtn.closest('.modal').id === 'chatbot-modal') {
                document.getElementById('chatbot-conversation').innerHTML = '';
            }
            // Remove dimming from all function-box elements
            document.querySelectorAll('.function-box').forEach(box => {
                box.classList.remove('shadowed');
            });
        });
    });

    // Tab Switching for Summarize and Translate
    document.querySelectorAll('.tab-btn').forEach(btn => {
        btn.addEventListener('click', () => {
            const tab = btn.dataset.tab;
            btn.closest('.modal').querySelectorAll('.tab-btn').forEach(b => b.classList.remove('active'));
            btn.classList.add('active');
            btn.closest('.modal').querySelectorAll('.tab-content').forEach(content => {
                content.classList.add('hidden');
                if (content.dataset.tab === tab) content.classList.remove('hidden');
            });
        });
    });

    // File Drop Handler
    window.handleDrop = function(event, dropArea) {
        event.preventDefault();
        const fileInput = dropArea.querySelector('input[type="file"]');
        const files = event.dataTransfer.files;
        if (files.length > 0) {
            fileInput.files = files;
            dropArea.querySelector('p').textContent = `Selected: ${files[0].name}`;
        }
    };

    // Chatbot Form Submission
    document.getElementById('chatbot-form').addEventListener('submit', async (e) => {
        e.preventDefault();
        const input = e.target.querySelector('input');
        const message = input.value.trim();
        const spinner = e.target.querySelector('.loading-spinner');
        if (!message) return;

        spinner.classList.remove('hidden');
        const conversation = document.getElementById('chatbot-conversation');
        conversation.innerHTML += `<p class="user-message">You: ${message}</p>`;
        conversation.scrollTop = conversation.scrollHeight;
        input.value = '';

        try {
            const response = await fetch('/chat', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ message })
            });
            const data = await response.json();
            spinner.classList.add('hidden');
            if (response.ok) {
                conversation.innerHTML += `<p class="bot-message">Gemini: ${data.response}</p>`;
            } else {
                conversation.innerHTML += `<p class="bot-message">Error: ${data.detail}</p>`;
            }
            conversation.scrollTop = conversation.scrollHeight;
        } catch (error) {
            spinner.classList.add('hidden');
            conversation.innerHTML += `<p class="bot-message">Error: ${error.message}</p>`;
            conversation.scrollTop = conversation.scrollHeight;
        }
    });

    // Form Submissions for Other Functionalities
    const forms = {
        'summarize-form': { endpoint: '/process', intent: 'summarize' },
        'summarize-file-form': { endpoint: '/process', intent: 'summarize' },
        'translate-text-form': { endpoint: '/process', intent: 'translate' },
        'translate-file-form': { endpoint: '/process', intent: 'file-translate' },
        'file-qa-form': { endpoint: '/process', intent: 'file-qa' },
        'image-caption-form': { endpoint: '/process', intent: 'image-to-text' },
        'visual-qa-form': { endpoint: '/process', intent: 'visual-qa' },
        'visualize-form': { endpoint: '/process', intent: 'visualize' }
    };

    Object.keys(forms).forEach(formId => {
        const form = document.getElementById(formId);
        form.addEventListener('submit', async (e) => {
            e.preventDefault();
            const formData = new FormData();
            const responseCard = form.nextElementSibling;
            const spinner = form.querySelector('.loading-spinner');
            responseCard.classList.add('hidden');
            responseCard.innerHTML = '';
            spinner.classList.remove('hidden');

            // Append intent to FormData
            formData.append('intent', forms[formId].intent);

            if (formId === 'summarize-form') {
                formData.append('text', form.querySelector('input[type="text"]').value);
            } else if (formId === 'summarize-file-form') {
                const file = form.querySelector('input[type="file"]').files[0];
                if (!file) {
                    responseCard.innerHTML = `<p class="text-red-500">Please select a file.</p>`;
                    responseCard.classList.remove('hidden');
                    spinner.classList.add('hidden');
                    return;
                }
                formData.append('file', file);
            } else if (formId === 'translate-text-form') {
                const text = form.querySelector('input[type="text"]').value;
                const lang = form.querySelector('select[name="language"]').value;
                formData.append('text', `Translate to ${lang}: ${text}`);
            } else if (formId === 'translate-file-form') {
                const file = form.querySelector('input[type="file"]').files[0];
                const lang = form.querySelector('select[name="language"]').value;
                if (!file) {
                    responseCard.innerHTML = `<p class="text-red-500">Please select a file.</p>`;
                    responseCard.classList.remove('hidden');
                    spinner.classList.add('hidden');
                    return;
                }
                formData.append('file', file);
                formData.append('text', `Translate to ${lang}`);
            } else if (formId === 'file-qa-form') {
                const file = form.querySelector('input[type="file"]').files[0];
                const text = form.querySelector('input[type="text"]').value;
                if (!file) {
                    responseCard.innerHTML = `<p class="text-red-500">Please select a file.</p>`;
                    responseCard.classList.remove('hidden');
                    spinner.classList.add('hidden');
                    return;
                }
                formData.append('file', file);
                formData.append('text', text);
            } else if (formId === 'image-caption-form') {
                const file = form.querySelector('input[type="file"]').files[0];
                if (!file) {
                    responseCard.innerHTML = `<p class="text-red-500">Please select an image.</p>`;
                    responseCard.classList.remove('hidden');
                    spinner.classList.add('hidden');
                    return;
                }
                formData.append('file', file);
            } else if (formId === 'visual-qa-form') {
                const file = form.querySelector('input[type="file"]').files[0];
                const text = form.querySelector('input[type="text"]').value;
                if (!file) {
                    responseCard.innerHTML = `<p class="text-red-500">Please select an image.</p>`;
                    responseCard.classList.remove('hidden');
                    spinner.classList.add('hidden');
                    return;
                }
                formData.append('file', file);
                formData.append('text', text);
            } else if (formId === 'visualize-form') {
                const file = form.querySelector('input[type="file"]').files[0];
                const visualizationType = form.querySelector('select[name="visualization-type"]').value;
                if (!file) {
                    responseCard.innerHTML = `<p class="text-red-500">Please select a file.</p>`;
                    responseCard.classList.remove('hidden');
                    spinner.classList.add('hidden');
                    return;
                }
                formData.append('file', file);
                formData.append('text', visualizationType);
            }

            try {
                const response = await fetch(forms[formId].endpoint, {
                    method: 'POST',
                    body: formData
                });
                const data = await response.json();
                spinner.classList.add('hidden');
                if (response.ok) {
                    responseCard.innerHTML = `<p>${data.response}</p>`;
                    if (data.additional_data) {
                        Object.entries(data.additional_data).forEach(([key, value]) => {
                            responseCard.innerHTML += `<p><strong>${key.replace('_', ' ').replace(/\b\w/g, char => char.toUpperCase())}:</strong> ${value}</p>`;
                        });
                    }
                    responseCard.classList.remove('hidden');
                } else {
                    responseCard.innerHTML = `<p class="text-red-500">Error: ${data.detail}</p>`;
                    responseCard.classList.remove('hidden');
                }
            } catch (error) {
                spinner.classList.add('hidden');
                responseCard.innerHTML = `<p class="text-red-500">Error: ${error.message}</p>`;
                responseCard.classList.remove('hidden');
            }
        });
    });
});