// Intersection Observer for scroll animations
document.addEventListener('DOMContentLoaded', function() {
    const observerOptions = {
        threshold: 0.1,
        rootMargin: '0px 0px -50px 0px'
    };

    const observer = new IntersectionObserver((entries) => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                entry.target.style.opacity = '1';
                entry.target.classList.add('animate-fade-in');
            }
        });
    }, observerOptions);

    // Observe elements that should animate on scroll
    const elementsToObserve = document.querySelectorAll('section');
    elementsToObserve.forEach(el => {
        observer.observe(el);
    });

    // Stat counter animation
    const animateCounters = () => {
        const counters = document.querySelectorAll('[data-count]');
        
        counters.forEach(counter => {
            const target = parseInt(counter.getAttribute('data-count'));
            const duration = 2000;
            const step = target / (duration / 16);
            let current = 0;

            const timer = setInterval(() => {
                current += step;
                if (current >= target) {
                    counter.textContent = target;
                    clearInterval(timer);
                } else {
                    counter.textContent = Math.floor(current);
                }
            }, 16);
        });
    };

    // Trigger counter animation when stats section is visible
    const statsSection = document.querySelector('.grid');
    if (statsSection) {
        const statsObserver = new IntersectionObserver((entries) => {
            entries.forEach(entry => {
                if (entry.isIntersecting) {
                    animateCounters();
                    statsObserver.unobserve(entry.target);
                }
            });
        }, { threshold: 0.5 });
        
        statsObserver.observe(statsSection);
    }
});

// Mobile menu toggle
function toggleMobileMenu() {
    const mobileMenu = document.querySelector('.mobile-menu');
    const overlay = document.querySelector('.overlay');
    const hamburger = document.querySelector('.hamburger');
    
    if (mobileMenu && overlay && hamburger) {
        mobileMenu.classList.toggle('active');
        overlay.classList.toggle('active');
        hamburger.classList.toggle('active');
    }
}

// Close mobile menu when clicking overlay
function closeMobileMenu() {
    const mobileMenu = document.querySelector('.mobile-menu');
    const overlay = document.querySelector('.overlay');
    const hamburger = document.querySelector('.hamburger');
    
    if (mobileMenu && overlay && hamburger) {
        mobileMenu.classList.remove('active');
        overlay.classList.remove('active');
        hamburger.classList.remove('active');
    }
}

// Work filtering functionality (for work page)
let selectedCategory = 'all';

function showCategory(category) {
    selectedCategory = category;
    
    // Update tab buttons
    const tabButtons = document.querySelectorAll('.tab-button');
    tabButtons.forEach(btn => {
        if (btn.getAttribute('onclick').includes(category)) {
            btn.classList.add('bg-gray-900', 'text-white');
            btn.classList.remove('bg-gray-200', 'text-gray-700');
        } else {
            btn.classList.add('bg-gray-200', 'text-gray-700');
            btn.classList.remove('bg-gray-900', 'text-white');
        }
    });
    
    // Show/hide projects with animation
    const tabContents = document.querySelectorAll('.tab-content');
    tabContents.forEach(content => {
        content.classList.remove('active');
    });
    
    const activeContent = document.querySelector(`.tab-content[data-category="${category}"]`);
    if (activeContent) {
        setTimeout(() => {
            activeContent.classList.add('active');
        }, 100);
    }
}

// Project modal functionality (for work page)
function openProject(title) {
    const modal = document.createElement('div');
    modal.className = 'fixed inset-0 z-50 flex items-center justify-center p-4 modal-backdrop';
    modal.style.backgroundColor = 'rgba(0, 0, 0, 0.8)';
    
    modal.innerHTML = `
        <div class="bg-white rounded-lg max-w-4xl w-full max-h-[90vh] overflow-y-auto relative transform scale-95 transition-transform duration-300">
            <button onclick="closeProject()" class="absolute top-4 right-4 z-10 w-10 h-10 bg-white rounded-full flex items-center justify-center hover:bg-gray-100 transition-colors">
                <i data-feather="x" class="w-6 h-6"></i>
            </button>
            <img src="http://static.photos/640x360/42" alt="${title}" class="w-full h-auto">
            <div class="p-8">
                <h2 class="text-3xl font-light mb-4">${title}</h2>
                <p class="text-gray-600 mb-6">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.</p>
                <div class="flex flex-wrap gap-2 mb-6">
                    <span class="px-3 py-1 bg-gray-200 text-gray-700 rounded-full text-sm">Web Design</span>
                    <span class="px-3 py-1 bg-gray-200 text-gray-700 rounded-full text-sm">Branding</span>
                    <span class="px-3 py-1 bg-gray-200 text-gray-700 rounded-full text-sm">UI/UX</span>
                </div>
                <a href="contact.html" class="inline-flex items-center gap-2 px-6 py-3 bg-gray-900 text-white rounded-lg hover:bg-gray-800 transition-all">
                    Start a Similar Project
                    <i data-feather="arrow-right" class="w-4 h-4"></i>
                </a>
            </div>
        </div>
    `;
    
    document.body.appendChild(modal);
    document.body.style.overflow = 'hidden';
    
    // Animate in
    setTimeout(() => {
        modal.firstElementChild.style.transform = 'scale(1)';
    }, 10);
    
    // Re-render Feather icons
    if (window.feather) {
        feather.replace();
    }
}

function closeProject() {
    const modal = document.querySelector('.modal-backdrop');
    if (modal) {
        modal.firstElementChild.style.transform = 'scale(0.95)';
        setTimeout(() => {
            modal.remove();
            document.body.style.overflow = '';
        }, 300);
    }
}

// Close modal when clicking outside
document.addEventListener('click', function(e) {
    if (e.target.classList.contains('modal-backdrop')) {
        closeProject();
    }
});

// Form submission handler (for contact page)
function submitContactForm(e) {
    e.preventDefault();
    const form = e.target;
    const formData = new FormData(form);
    const submitBtn = form.querySelector('button[type="submit"]');
    
    // Show loading state
    const originalBtnText = submitBtn.innerHTML;
    submitBtn.innerHTML = '<span class="loading-dots">Sending</span>';
    submitBtn.disabled = true;
    
    // Simulate form submission
    setTimeout(() => {
        // Success message
        const successMessage = document.createElement('div');
        successMessage.className = 'mb-6 p-4 bg-green-100 text-green-700 rounded-lg';
        successMessage.innerHTML = `
            <div class="flex items-center gap-3">
                <i data-feather="check-circle" class="w-6 h-6"></i>
                <span>Thank you for your message! We'll get back to you soon.</span>
            </div>
        `;
        
        form.parentNode.insertBefore(successMessage, form);
        form.reset();
        
        // Reset button
        submitBtn.innerHTML = originalBtnText;
        submitBtn.disabled = false;
        
        // Re-render Feather icons
        if (window.feather) {
            feather.replace();
        }
        
        // Remove success message after 5 seconds
        setTimeout(() => {
            successMessage.remove();
        }, 5000);
    }, 2000);
}

// Smooth scroll to top
function scrollToTop() {
    window.scrollTo({
        top: 0,
        behavior: 'smooth'
    });
}

// Parallax effect for hero section
window.addEventListener('scroll', () => {
    const scrolled = window.pageYOffset;
    const parallax = document.querySelector('.parallax-bg');
    
    if (parallax && window.innerWidth > 768) {
        const yPos = -(scrolled * 0.5);
        parallax.style.transform = `translateY(${yPos}px)`;
    }
});

// Add hover effect to project cards
document.addEventListener('DOMContentLoaded', () => {
    const projectCards = document.querySelectorAll('.project-card');
    
    projectCards.forEach(card => {
        card.addEventListener('mouseenter', () => {
            card.style.transform = 'translateY(-8px)';
        });
        
        card.addEventListener('mouseleave', () => {
            card.style.transform = 'translateY(0)';
        });
    });
});

// Lazy loading images
function lazyLoadImages() {
    const images = document.querySelectorAll('img[loading="lazy"]');
    
    if ('IntersectionObserver' in window) {
        const imageObserver = new IntersectionObserver((entries, observer) => {
            entries.forEach(entry => {
                if (entry.isIntersecting) {
                    const img = entry.target;
                    img.src = img.dataset.src || img.src;
                    img.classList.remove('opacity-0');
                    img.classList.add('opacity-100');
                    observer.unobserve(img);
                }
            });
        });
        
        images.forEach(img => imageObserver.observe(img));
    }
}

// Initialize lazy loading
lazyLoadImages();

// Keyboard navigation for accessibility
document.addEventListener('keydown', (e) => {
    if (e.key === 'Escape') {
        closeProject();
        closeMobileMenu();
    }
});