// Main Application Script
document.addEventListener('DOMContentLoaded', function() {
    // Initialize Three.js Scene
    initThreeJSScene();
    initInteractive3DScene();
    
    // Load Blog Posts from API
    loadBlogPosts();
    
    // Theme Toggle Logic
    initThemeToggle();
    
    // Smooth Scroll for Anchor Links
    initSmoothScroll();
    
    // Initialize CMS Dashboard Demo
    initCMSDashboard();
});

// Three.js Background Animation
function initThreeJSScene() {
    const container = document.getElementById('threejs-container');
    if (!container) return;
    
    // Scene setup
    const scene = new THREE.Scene();
    const camera = new THREE.PerspectiveCamera(75, container.clientWidth / container.clientHeight, 0.1, 1000);
    const renderer = new THREE.WebGLRenderer({ antialias: true, alpha: true });
    
    renderer.setSize(container.clientWidth, container.clientHeight);
    renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
    container.appendChild(renderer.domElement);
    
    // Lighting
    const ambientLight = new THREE.AmbientLight(0xffffff, 0.6);
    scene.add(ambientLight);
    
    const directionalLight = new THREE.DirectionalLight(0xffffff, 0.8);
    directionalLight.position.set(5, 5, 5);
    scene.add(directionalLight);
    
    // Create floating geometric objects
    const geometryTypes = [
        new THREE.TorusGeometry(1, 0.4, 16, 100),
        new THREE.IcosahedronGeometry(1, 0),
        new THREE.OctahedronGeometry(1, 0),
        new THREE.TorusKnotGeometry(1, 0.3, 100, 16)
    ];
    
    const material = new THREE.MeshStandardMaterial({
        color: 0x3b82f6,
        metalness: 0.3,
        roughness: 0.4,
        transparent: true,
        opacity: 0.8
    });
    
    const objects = [];
    for (let i = 0; i < 8; i++) {
        const geometry = geometryTypes[Math.floor(Math.random() * geometryTypes.length)];
        const mesh = new THREE.Mesh(geometry, material.clone());
        
        mesh.position.x = (Math.random() - 0.5) * 20;
        mesh.position.y = (Math.random() - 0.5) * 10;
        mesh.position.z = (Math.random() - 0.5) * 20;
        
        mesh.rotation.x = Math.random() * Math.PI;
        mesh.rotation.y = Math.random() * Math.PI;
        
        mesh.userData = {
            speed: 0.02 + Math.random() * 0.03,
            rotationSpeed: {
                x: (Math.random() - 0.5) * 0.02,
                y: (Math.random() - 0.5) * 0.02,
                z: (Math.random() - 0.5) * 0.02
            },
            floatAmplitude: 0.5 + Math.random() * 1,
            floatSpeed: 1 + Math.random() * 2,
            initialY: mesh.position.y
        };
        
        mesh.material.color.setHSL(Math.random(), 0.7, 0.6);
        scene.add(mesh);
        objects.push(mesh);
    }
    
    camera.position.z = 15;
    
    // Animation loop
    function animate() {
        requestAnimationFrame(animate);
        
        objects.forEach(mesh => {
            // Floating animation
            mesh.position.y = mesh.userData.initialY + Math.sin(Date.now() * 0.001 * mesh.userData.floatSpeed) * mesh.userData.floatAmplitude;
            
            // Rotation
            mesh.rotation.x += mesh.userData.rotationSpeed.x;
            mesh.rotation.y += mesh.userData.rotationSpeed.y;
            mesh.rotation.z += mesh.userData.rotationSpeed.z;
            
            // Gentle orbit
            mesh.position.x += Math.cos(Date.now() * 0.001 * mesh.userData.speed) * 0.02;
            mesh.position.z += Math.sin(Date.now() * 0.001 * mesh.userData.speed) * 0.02;
        });
        
        renderer.render(scene, camera);
    }
    
    // Handle window resize
    window.addEventListener('resize', () => {
        camera.aspect = container.clientWidth / container.clientHeight;
        camera.updateProjectionMatrix();
        renderer.setSize(container.clientWidth, container.clientHeight);
    });
    
    animate();
}

// Interactive 3D Scene
function initInteractive3DScene() {
    const container = document.getElementById('interactive-3d');
    if (!container) return;
    
    const scene = new THREE.Scene();
    const camera = new THREE.PerspectiveCamera(75, container.clientWidth / container.clientHeight, 0.1, 1000);
    const renderer = new THREE.WebGLRenderer({ antialias: true, alpha: true });
    
    renderer.setSize(container.clientWidth, container.clientHeight);
    renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
    container.appendChild(renderer.domElement);
    
    // Add OrbitControls
    const controls = new THREE.OrbitControls(camera, renderer.domElement);
    controls.enableDamping = true;
    controls.dampingFactor = 0.05;
    
    // Create a more complex 3D object
    const geometry = new THREE.IcosahedronGeometry(3, 2);
    const material = new THREE.MeshNormalMaterial({ wireframe: false });
    const mesh = new THREE.Mesh(geometry, material);
    scene.add(mesh);
    
    // Add wireframe version
    const wireframe = new THREE.LineSegments(
        new THREE.WireframeGeometry(geometry),
        new THREE.LineBasicMaterial({ color: 0xffffff, linewidth: 2 })
    );
    mesh.add(wireframe);
    
    // Add particles around the object
    const particleGeometry = new THREE.BufferGeometry();
    const particleCount = 1000;
    const positions = new Float32Array(particleCount * 3);
    
    for (let i = 0; i < particleCount * 3; i += 3) {
        const radius = 5 + Math.random() * 3;
        const theta = Math.random() * Math.PI * 2;
        const phi = Math.random() * Math.PI;
        
        positions[i] = radius * Math.sin(phi) * Math.cos(theta);
        positions[i + 1] = radius * Math.cos(phi);
        positions[i + 2] = radius * Math.sin(phi) * Math.sin(theta);
    }
    
    particleGeometry.setAttribute('position', new THREE.BufferAttribute(positions, 3));
    
    const particleMaterial = new THREE.PointsMaterial({
        color: 0xa855f7,
        size: 0.05,
        transparent: true
    });
    
    const particles = new THREE.Points(particleGeometry, particleMaterial);
    scene.add(particles);
    
    camera.position.z = 10;
    
    // Animation loop
    function animate() {
        requestAnimationFrame(animate);
        
        mesh.rotation.x += 0.005;
        mesh.rotation.y += 0.005;
        
        particles.rotation.y += 0.001;
        
        controls.update();
        renderer.render(scene, camera);
    }
    
    // Handle window resize
    window.addEventListener('resize', () => {
        camera.aspect = container.clientWidth / container.clientHeight;
        camera.updateProjectionMatrix();
        renderer.setSize(container.clientWidth, container.clientHeight);
    });
    
    animate();
}

// Load Blog Posts from Mock API
async function loadBlogPosts() {
    const container = document.getElementById('blog-posts');
    if (!container) return;
    
    // Mock API URL - In a real implementation, this would be your headless CMS endpoint
    const mockApiUrl = 'https://jsonplaceholder.typicode.com/posts?_limit=6';
    
    try {
        container.innerHTML = `
            <div class="col-span-1 md:col-span-2 lg:col-span-3 text-center py-12">
                <div class="inline-block animate-spin rounded-full h-12 w-12 border-t-2 border-b-2 border-primary-600"></div>
                <p class="mt-4 text-gray-600 dark:text-gray-400">Loading articles from CMS...</p>
            </div>
        `;
        
        const response = await fetch(mockApiUrl);
        const posts = await response.json();
        
        container.innerHTML = '';
        
        posts.forEach((post, index) => {
            const colors = ['primary', 'secondary'];
            const color = colors[index % colors.length];
            
            const card = document.createElement('div');
            card.className = 'blog-card bg-white dark:bg-gray-800 rounded-2xl shadow-xl overflow-hidden transform transition-all duration-300 hover:shadow-2xl';
            card.innerHTML = `
                <div class="h-48 overflow-hidden">
                    <img src="https://static.photos/${color === 'primary' ? 'technology' : 'abstract'}/640x360/${index + 100}" 
                         alt="${post.title}" 
                         class="w-full h-full object-cover transform hover:scale-110 transition-transform duration-500">
                </div>
                <div class="p-6">
                    <div class="flex items-center gap-2 mb-4">
                        <span class="px-3 py-1 text-xs font-semibold rounded-full bg-${color}-100 dark:bg-${color}-900/30 text-${color}-600 dark:text-${color}-400">
                            ${color === 'primary' ? 'TECHNOLOGY' : 'DESIGN'}
                        </span>
                        <span class="text-gray-500 dark:text-gray-400 text-sm">${Math.floor(Math.random() * 30) + 1} min read</span>
                    </div>
                    <h3 class="text-xl font-bold mb-3 line-clamp-2">${post.title}</h3>
                    <p class="text-gray-600 dark:text-gray-400 mb-4 line-clamp-3">${post.body}</p>
                    <div class="flex items-center justify-between">
                        <div class="flex items-center gap-2">
                            <div class="w-8 h-8 rounded-full bg-gradient-to-r from-${color}-400 to-${color}-600 flex items-center justify-center text-white text-xs">
                                ${post.userId}
                            </div>
                            <span class="text-sm text-gray-700 dark:text-gray-300">Author ${post.userId}</span>
                        </div>
                        <a href="#" class="text-${color}-600 dark:text-${color}-400 hover:text-${color}-700 dark:hover:text-${color}-300 font-semibold text-sm flex items-center gap-1">
                            Read More <i data-feather="arrow-right" class="w-4 h-4"></i>
                        </a>
                    </div>
                </div>
            `;
            container.appendChild(card);
        });
        
        feather.replace();
    } catch (error) {
        console.error('Error loading blog posts:', error);
        container.innerHTML = `
            <div class="col-span-1 md:col-span-2 lg:col-span-3 text-center py-12">
                <i data-feather="alert-circle" class="w-16 h-16 text-red-500 mx-auto"></i>
                <p class="mt-4 text-gray-600 dark:text-gray-400">Unable to load articles. Please check your connection.</p>
            </div>
        `;
        feather.replace();
    }
}
// Theme Toggle Functionality
function initThemeToggle() {
    const themeToggles = document.querySelectorAll('[data-theme-toggle]');
    if (!themeToggles.length) return;
    
    const prefersDarkScheme = window.matchMedia('(prefers-color-scheme: dark)');
    const currentTheme = localStorage.getItem('theme') || (prefersDarkScheme.matches ? 'dark' : 'light');
    
    if (currentTheme === 'dark') {
        document.documentElement.classList.add('dark');
    }
    
    themeToggles.forEach(themeToggle => {
        themeToggle.addEventListener('click', () => {
            const isDark = document.documentElement.classList.toggle('dark');
            localStorage.setItem('theme', isDark ? 'dark' : 'light');
            
            // Update icons
            const icons = document.querySelectorAll('[data-feather]');
            icons.forEach(icon => {
                if (icon.getAttribute('data-feather') === 'moon' || icon.getAttribute('data-feather') === 'sun') {
                    icon.setAttribute('data-feather', isDark ? 'sun' : 'moon');
                }
            });
            feather.replace();
        });
    });
    
    // Also update icons on initial load
    setTimeout(() => {
        const isDark = document.documentElement.classList.contains('dark');
        const icons = document.querySelectorAll('[data-feather]');
        icons.forEach(icon => {
            if (icon.getAttribute('data-feather') === 'moon' || icon.getAttribute('data-feather') === 'sun') {
                icon.setAttribute('data-feather', isDark ? 'sun' : 'moon');
            }
        });
        feather.replace();
    }, 100);
}
// Smooth Scroll Implementation
function initSmoothScroll() {
    document.querySelectorAll('a[href^="#"]').forEach(anchor => {
        anchor.addEventListener('click', function(e) {
            e.preventDefault();
            
            const targetId = this.getAttribute('href');
            if (targetId === '#') return;
            
            const targetElement = document.querySelector(targetId);
            if (targetElement) {
                window.scrollTo({
                    top: targetElement.offsetTop - 80,
                    behavior: 'smooth'
                });
            }
        });
    });
}

// CMS Dashboard Demo
function initCMSDashboard() {
    // Simulate real-time updates
    setInterval(() => {
        const stats = document.querySelectorAll('.stat-value');
        stats.forEach(stat => {
            if (stat.classList.contains('animate-pulse')) {
                stat.classList.remove('animate-pulse');
                setTimeout(() => stat.classList.add('animate-pulse'), 10);
            }
        });
    }, 3000);
    
    // Simulate API call for CMS status
    setTimeout(() => {
        const statusIndicator = document.getElementById('cms-status');
        if (statusIndicator) {
            statusIndicator.innerHTML = `
                <div class="flex items-center gap-2 text-green-500">
                    <div class="w-3 h-3 bg-green-500 rounded-full animate-pulse"></div>
                    <span>CMS Connected • Real-time Sync Active</span>
                </div>
            `;
        }
    }, 1500);
}