// --- CONFIGURATION & STATE ---
const config = {
    localApiUrl: localStorage.getItem('motif_api_url') || null,
};

// --- DOM ELEMENTS ---
const modal = document.getElementById('guide-modal');
const showGuideBtn = document.getElementById('show-guide');
const closeModalBtn = document.querySelector('.close-modal');
const saveConnectionBtn = document.getElementById('save-connection');
const apiUrlInput = document.getElementById('api-url');
const navItems = document.querySelectorAll('.nav-item');
const sections = document.querySelectorAll('main section');

// --- STARTUP BEHAVIOR ---
document.addEventListener('DOMContentLoaded', () => {
    // 1. Mandatory Setup Guide - Show popup if no API is saved
    if (!config.localApiUrl) {
        openModal();
    } else {
        apiUrlInput.value = config.localApiUrl;
    }
    
    // 2. Initialize Cool Cursor Trail Effect
    initializeCursorTrail();
});

// --- UI / NAVIGATION HANDLERS ---
navItems.forEach(item => {
    item.addEventListener('click', (e) => {
        // Handle Sidebar active state
        navItems.forEach(nav => nav.classList.remove('active'));
        item.classList.add('active');

        // Handle Main Section visibility (Scrolling effect control)
        const targetSectionId = item.getAttribute('data-target');
        sections.forEach(sec => sec.classList.remove('active-section'));
        document.getElementById(targetSectionId).classList.add('active-section');
    });
});

// --- MODAL / CONNECTION GUIDE LOGIC ---
function openModal() { modal.classList.add('active-modal'); }
function closeModal() { modal.classList.remove('active-modal'); }

showGuideBtn.addEventListener('click', openModal);
closeModalBtn.addEventListener('click', closeModal);
modal.addEventListener('click', (e) => {
    // Close if clicking overlay area outside the content box
    if (e.target === modal) closeModal(); 
});

saveConnectionBtn.addEventListener('click', () => {
    const enteredUrl = apiUrlInput.value.trim();
    if (enteredUrl) {
        localStorage.setItem('motif_api_url', enteredUrl);
        config.localApiUrl = enteredUrl;
        closeModal();
        alert(`Setup Complete! 🦄 Portal connected to backend at: ${enteredUrl}`);
    } else {
        alert('Please enter your local API address (e.g., http://localhost:7860)');
    }
});

// --- COOL MOUSE EFFECTS (PASTEL CURSOR TRAIL) ---
function initializeCursorTrail() {
    const trailContainer = document.getElementById('cursor-trail');
    const dots = [];
    const numDots = 12;
    
    // Create dots with alternating pastel colors
    for (let i = 0; i < numDots; i++) {
        const dot = document.createElement('div');
        dot.className = 'trail-dot';
        dot.style.backgroundColor = getPastelColor(i);
        trailContainer.appendChild(dot);
        dots.push({ element: dot, x: 0, y: 0 });
    }

    let mouseX = 0, mouseY = 0;

    window.addEventListener('mousemove', (e) => {
        mouseX = e.clientX;
        mouseY = e.clientY;
    });

    // Animation loop for dots lagging smoothly behind cursor
    function animateTrail() {
        let x = mouseX;
        let y = mouseY;
        
        dots.forEach((dot, index) => {
            const nextDot = dots[index + 1] || dots[0];
            
            dot.x = x;
            dot.y = y;
            dot.element.style.left = x + 'px';
            dot.element.style.top = y + 'px';
            dot.element.style.opacity = 1 - (index / numDots); // Trail fades out

            // Apply smooth lag effect
            x += (nextDot.x - x) * 0.3;
            y += (nextDot.y - y) * 0.3;
        });
        requestAnimationFrame(animateTrail);
    }
    animateTrail();
}

function getPastelColor(index) {
    const colors = ['#ffe6d9', '#d6eaff', '#fbe0e6', '#e1f7f1']; // Peach, Blue, Pink, Mint
    return colors[index % colors.length];
}

// --- GENERATION LOGIC (CONNECTION PLACEHOLDER) ---
const generateButtons = document.querySelectorAll('.generate-btn');
generateButtons.forEach(btn => {
    btn.addEventListener('click', handleGeneration);
});

async function handleGeneration(e) {
    if (!config.localApiUrl) {
        alert("Wait! 🛑 To keep this portal unlimited and free, you must connect to your own powerful local computer first. Click 'Connection Guide'.");
        openModal();
        return;
    }

    const outputArea = document.getElementById('video-output');
    
    // Add loading animation and swell effect
    outputArea.innerHTML = '<span class="status-text">Connecting to local GPU...</span><div class="loading-spinner"></div>';
    outputArea.closest('.animated-frame').classList.add('generating-active');

    // PLACEHOLDER GENERATION SIMULATION
    // In a real application, you would send a POST request to ${config.localApiUrl} here.
    console.log(`Sending generation request to local backend: ${config.localApiUrl}`);

    // Simulate backend processing time (4 seconds)
    setTimeout(() => {
        outputArea.innerHTML = ''; // Clear status spinner
        
        // Use placeholder output from model card
        const video = document.createElement('video');
        video.src = 'https://huggingface.co/Motif-Technologies/Motif-Video-2B/resolve/main/assets/banner.mp4'; 
        video.autoplay = true;
        video.loop = true;
        video.controls = true;
        video.style.width = '100%';
        outputArea.appendChild(video);
        
        outputArea.closest('.animated-frame').classList.remove('generating-active');
    }, 4000); 
}