// Global JavaScript for Beck-Publishing
document.addEventListener('DOMContentLoaded', function() {
    // Initialize animations
    initAnimations();
    
    // Initialize form handling
    initForms();
    
    // Initialize scroll effects
    initScrollEffects();
    
    // Initialize service worker for PWA (optional)
    if ('serviceWorker' in navigator) {
        navigator.serviceWorker.register('/sw.js')
            .then(() => console.log('Service Worker Registered'))
            .catch(err => console.log('Service Worker Registration Failed: ', err));
    }
});

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

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

    // Observe elements with animation class
    document.querySelectorAll('.animate-on-scroll').forEach(el => {
        observer.observe(el);
    });
}

function initForms() {
    // Contact form handling
    const contactForm = document.getElementById('contactForm');
    if (contactForm) {
        contactForm.addEventListener('submit', function(e) {
            e.preventDefault();
            const submitBtn = this.querySelector('button[type="submit"]');
            const originalText = submitBtn.textContent;
            
            // Show loading state
            submitBtn.disabled = true;
            submitBtn.innerHTML = '<div class="loading-spinner"></div> Processing...';
            
            // Simulate form submission (replace with actual API call)
            setTimeout(() => {
                alert('Thank you for your message! I\'ll get back to you soon.');
                contactForm.reset();
                submitBtn.disabled = false;
                submitBtn.textContent = originalText;
            }, 2000);
        });
    }
}

function initScrollEffects() {
    // Navbar scroll effect
    let lastScrollY = window.scrollY;
    const navbar = document.querySelector('custom-navbar');
    
    window.addEventListener('scroll', () => {
        if (!navbar) return;
        
        const currentScrollY = window.scrollY;
        
        if (currentScrollY > lastScrollY && currentScrollY > 100) {
            navbar.style.transform = 'translateY(-100%)';
        } else {
            navbar.style.transform = 'translateY(0)';
        }
        
        lastScrollY = currentScrollY;
        
        // Add shadow when scrolled
        if (currentScrollY > 50) {
            navbar.style.boxShadow = '0 4px 20px rgba(0, 0, 0, 0.1)';
        } else {
            navbar.style.boxShadow = 'none';
        }
    });
}

// Utility function for smooth scrolling
function smoothScrollTo(target) {
    const element = document.querySelector(target);
    if (element) {
        element.scrollIntoView({
            behavior: 'smooth',
            block: 'start'
        });
    }
}

// Debounce function for performance
function debounce(func, wait) {
    let timeout;
    return function executedFunction(...args) {
        const later = () => {
            clearTimeout(timeout);
            func(...args);
        };
        clearTimeout(timeout);
        timeout = setTimeout(later, wait);
    };
}

// Format phone number
function formatPhoneNumber(phone) {
    const cleaned = ('' + phone).replace(/\D/g, '');
    const match = cleaned.match(/^(\d{3})(\d{3})(\d{4})$/);
    if (match) {
        return '(' + match[1] + ') ' + match[2] + '-' + match[3];
    }
    return phone;
}

// Email validation
function isValidEmail(email) {
    const re = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return re.test(email);
}