// Theme Toggle Functionality
const themeToggle = document.querySelector('.theme-toggle');
const icon = themeToggle.querySelector('i');

// Check for saved theme preference
const savedTheme = localStorage.getItem('theme');
if (savedTheme) {
    document.documentElement.setAttribute('data-theme', savedTheme);
    updateIcon(savedTheme);
}

// Theme toggle click handler
themeToggle.addEventListener('click', () => {
    const currentTheme = document.documentElement.getAttribute('data-theme');
    const newTheme = currentTheme === 'dark' ? 'light' : 'dark';
    
    document.documentElement.setAttribute('data-theme', newTheme);
    localStorage.setItem('theme', newTheme);
    updateIcon(newTheme);
});

// Update icon based on theme
function updateIcon(theme) {
    icon.className = theme === 'dark' ? 'fas fa-sun' : 'fas fa-moon';
}

// Mobile Navigation Toggle
const burger = document.querySelector('.burger');
const nav = document.querySelector('.nav-links');
const navLinks = document.querySelectorAll('.nav-links li');

burger.addEventListener('click', () => {
    // Toggle Navigation
    nav.classList.toggle('active');

    // Animate Links
    navLinks.forEach((link, index) => {
        if (link.style.animation) {
            link.style.animation = '';
        } else {
            link.style.animation = `navLinkFade 0.5s ease forwards ${index / 7 + 0.3}s`;
        }
    });

    // Burger Animation
    burger.classList.toggle('toggle');
});

// Smooth Scrolling for Navigation Links
document.querySelectorAll('a[href^="#"]').forEach(anchor => {
    anchor.addEventListener('click', function (e) {
        e.preventDefault();
        document.querySelector(this.getAttribute('href')).scrollIntoView({
            behavior: 'smooth'
        });
    });
});

// Typing Animation
const typingText = document.querySelector('.typing-text');
const words = ['Software Developer', 'Cloud Developer', 'Problem Solver'];
let wordIndex = 0;
let charIndex = 0;
let isDeleting = false;

function type() {
    const currentWord = words[wordIndex];
    
    if (isDeleting) {
        typingText.textContent = currentWord.substring(0, charIndex - 1);
        charIndex--;
    } else {
        typingText.textContent = currentWord.substring(0, charIndex + 1);
        charIndex++;
    }

    if (!isDeleting && charIndex === currentWord.length) {
        isDeleting = true;
        setTimeout(type, 2000);
    } else if (isDeleting && charIndex === 0) {
        isDeleting = false;
        wordIndex = (wordIndex + 1) % words.length;
        setTimeout(type, 500);
    } else {
        setTimeout(type, isDeleting ? 100 : 200);
    }
}

// Start typing animation
type();

// Scroll Animation
const observerOptions = {
    threshold: 0.1
};

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

// Observe all sections
document.querySelectorAll('section').forEach(section => {
    observer.observe(section);
});

// Form Submission
const contactForm = document.querySelector('.contact-form');
contactForm.addEventListener('submit', (e) => {
    e.preventDefault();
    
    // Get form data
    const formData = new FormData(contactForm);
    const data = Object.fromEntries(formData);
    
    // Here you would typically send the data to a server
    console.log('Form submitted:', data);
    
    // Show success message
    alert('Thank you for your message! I will get back to you soon.');
    contactForm.reset();
});

// Add active class to navigation links on scroll
const sections = document.querySelectorAll('section');
const navItems = document.querySelectorAll('.nav-links a');

window.addEventListener('scroll', () => {
    let current = '';
    
    sections.forEach(section => {
        const sectionTop = section.offsetTop;
        const sectionHeight = section.clientHeight;
        if (pageYOffset >= sectionTop - sectionHeight / 3) {
            current = section.getAttribute('id');
        }
    });

    navItems.forEach(item => {
        item.classList.remove('active');
        if (item.getAttribute('href').slice(1) === current) {
            item.classList.add('active');
        }
    });
});

// Add CSS for active navigation link
const style = document.createElement('style');
style.textContent = `
    .nav-links a.active {
        color: #3498db;
        font-weight: bold;
    }
`;
document.head.appendChild(style);

// Initialize Tilt.js for hero image and skill cards
VanillaTilt.init(document.querySelectorAll(".image-container, .skill-category"), {
    max: 5,
    speed: 400,
    glare: true,
    "max-glare": 0.2
});

// Stats Counter Animation
function animateValue(element, start, end, duration) {
    let startTimestamp = null;
    const step = (timestamp) => {
        if (!startTimestamp) startTimestamp = timestamp;
        const progress = Math.min((timestamp - startTimestamp) / duration, 1);
        const currentValue = Math.floor(progress * (end - start) + start);
        element.textContent = currentValue + (element.dataset.suffix || '');
        if (progress < 1) {
            window.requestAnimationFrame(step);
        }
    };
    window.requestAnimationFrame(step);
}

// Stats Observer
const statsObserver = new IntersectionObserver((entries) => {
    entries.forEach(entry => {
        if (entry.isIntersecting) {
            const stats = entry.target.querySelectorAll('.stat-item h3');
            stats.forEach(stat => {
                const finalValue = parseInt(stat.dataset.value);
                stat.textContent = '0';
                animateValue(stat, 0, finalValue, 2000);
            });
            statsObserver.unobserve(entry.target);
        }
    });
}, {
    threshold: 0.5
});

// Observe the stats section
const statsSection = document.querySelector('.stats');
if (statsSection) {
    statsObserver.observe(statsSection);
}

// Scroll to Top Functionality
const scrollToTopButton = document.getElementById('scrollToTop');

// Show button when scrolling down
window.addEventListener('scroll', () => {
    if (window.pageYOffset > 300) {
        scrollToTopButton.classList.add('visible');
    } else {
        scrollToTopButton.classList.remove('visible');
    }
});

// Smooth scroll to top when clicked
scrollToTopButton.addEventListener('click', () => {
    window.scrollTo({
        top: 0,
        behavior: 'smooth'
    });
});