// Dark Mode System
class DarkModeManager {
    constructor() {
        this.isDark = localStorage.getItem('darkMode') === 'true' || 
                     (!localStorage.getItem('darkMode') && window.matchMedia('(prefers-color-scheme: dark)').matches);
        this.init();
    }

    init() {
        this.applyTheme();
        this.setupToggle();
        this.setupSystemThemeListener();
    }

    applyTheme() {
        if (this.isDark) {
            document.documentElement.classList.add('dark');
        } else {
            document.documentElement.classList.remove('dark');
        }
        this.updateToggleUI();
    }

    toggle() {
        this.isDark = !this.isDark;
        localStorage.setItem('darkMode', this.isDark);
        this.applyTheme();
    }

    setupToggle() {
        const toggles = document.querySelectorAll('.dark-mode-toggle');
        toggles.forEach(toggle => {
            toggle.addEventListener('click', () => this.toggle());
        });
    }

    updateToggleUI() {
        const toggles = document.querySelectorAll('.dark-mode-toggle');
        toggles.forEach(toggle => {
            if (this.isDark) {
                toggle.classList.add('active');
            } else {
                toggle.classList.remove('active');
            }
        });
    }

    setupSystemThemeListener() {
        window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', (e) => {
            if (!localStorage.getItem('darkMode')) {
                this.isDark = e.matches;
                this.applyTheme();
            }
        });
    }
}

// Smooth scroll for internal links
function initSmoothScroll() {
    document.querySelectorAll('a[href^="#"]').forEach(anchor => {
        anchor.addEventListener('click', function (e) {
            e.preventDefault();
            const target = document.querySelector(this.getAttribute('href'));
            if (target) {
                target.scrollIntoView({
                    behavior: 'smooth',
                    block: 'start'
                });
            }
        });
    });
}

// Intersection Observer for animations
function initScrollAnimations() {
    const observer = new IntersectionObserver((entries) => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                entry.target.classList.add('animate-fade-in');
            }
        });
    }, {
        threshold: 0.1,
        rootMargin: '0px 0px -50px 0px'
    });

    // Observe all sections and cards
    document.querySelectorAll('section, .group').forEach(el => {
        observer.observe(el);
    });
}

// Add CSS animation class
const style = document.createElement('style');
style.textContent = `
    @keyframes fade-in-up {
        from {
            opacity: 0;
            transform: translateY(30px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
    
    .animate-fade-in {
        animation: fade-in-up 0.8s ease-out forwards;
    }
`;
document.head.appendChild(style);

// Navigation scroll effect
function initNavigationEffects() {
    let lastScroll = 0;
    const header = document.querySelector('header');
    
    window.addEventListener('scroll', () => {
        const currentScroll = window.pageYOffset;
        
        if (header) {
            if (currentScroll > 100) {
                header.classList.add('backdrop-blur-lg', 'bg-white/80', 'dark:bg-slate-900/80');
                header.classList.remove('bg-white', 'dark:bg-slate-900');
            } else {
                header.classList.remove('backdrop-blur-lg', 'bg-white/80', 'dark:bg-slate-900/80');
                header.classList.add('bg-white', 'dark:bg-slate-900');
            }
        }
        
        lastScroll = currentScroll;
    });
}

// Initialize all features
document.addEventListener('DOMContentLoaded', () => {
    new DarkModeManager();
    initSmoothScroll();
    initScrollAnimations();
    initNavigationEffects();
    
    // Add loading state removal
    document.body.classList.add('loaded');
});

// Export for use in components
window.DarkModeManager = DarkModeManager;