/**
 * ArcaneNeko Website - Main Initialization
 * 
 * Handles: mobile menu, scroll reveal, stat counters, 
 * back-to-top, scroll progress, smooth scroll
 */

// ----------------------
// Mobile Hamburger Menu
// ----------------------
function initMobileMenu() {
    const hamburger = document.getElementById('hamburger');
    const mobileMenu = document.getElementById('mobileMenu');
    if (!hamburger || !mobileMenu) return;

    hamburger.addEventListener('click', () => {
        const open = hamburger.classList.toggle('open');
        mobileMenu.classList.toggle('open', open);
        hamburger.setAttribute('aria-expanded', String(open));
    });

    mobileMenu.querySelectorAll('a').forEach(link => {
        link.addEventListener('click', () => {
            hamburger.classList.remove('open');
            mobileMenu.classList.remove('open');
            hamburger.setAttribute('aria-expanded', 'false');
        });
    });
}

// ----------------------
// Scroll Reveal (cards)
// ----------------------
function initScrollReveal() {
    const observer = new IntersectionObserver(entries => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                entry.target.classList.add('visible');
                observer.unobserve(entry.target);
            }
        });
    }, { threshold: 0.1 });

    document.querySelectorAll('.reveal').forEach(el => observer.observe(el));
}

// ----------------------
// Stat Counter Animation
// ----------------------
function animateCount(el, target, suffix, duration) {
    const start = performance.now();
    const from  = 0;

    function step(now) {
        const elapsed  = now - start;
        const progress = Math.min(elapsed / duration, 1);
        const eased    = 1 - Math.pow(1 - progress, 3);
        const current  = Math.round(from + (target - from) * eased);
        el.textContent = current + suffix;
        if (progress < 1) requestAnimationFrame(step);
    }
    requestAnimationFrame(step);
}

function initStatCounters() {
    const statsBar = document.querySelector('.stats-bar');
    if (!statsBar) return;

    const observer = new IntersectionObserver(entries => {
        if (!entries[0].isIntersecting) return;
        observer.disconnect();

        document.querySelectorAll('.stat').forEach(el => el.classList.add('animated'));

        document.querySelectorAll('.stat-value[data-count]').forEach(el => {
            const target   = parseFloat(el.dataset.count);
            const suffix   = el.dataset.suffix || '';
            const duration = 1400;
            animateCount(el, target, suffix, duration);
        });

    }, { threshold: 0.5 });

    observer.observe(statsBar);
}

// ----------------------
// Back to Top Button
// ----------------------
function initBackToTop() {
    const btn = document.getElementById('backToTop');
    if (!btn) return;

    window.addEventListener('scroll', () => {
        btn.classList.toggle('visible', window.scrollY > 450);
    }, { passive: true });

    btn.addEventListener('click', () => {
        window.scrollTo({ top: 0, behavior: 'smooth' });
    });
}

// ----------------------
// Scroll Progress Bar (legal pages)
// ----------------------
function initScrollProgress() {
    const bar = document.getElementById('scrollProgress');
    if (!bar) return;

    const updateProgress = () => {
        const total = document.documentElement.scrollHeight - window.innerHeight;
        const progress = total > 0 ? (window.scrollY / total) * 100 : 0;
        const rounded = Math.round(progress);
        bar.style.width = progress + '%';
        bar.setAttribute('aria-valuenow', String(rounded));
    };

    updateProgress();
    window.addEventListener('scroll', updateProgress, { passive: true });
    window.addEventListener('resize', updateProgress);
}

// ----------------------
// Navbar scroll shadow
// ----------------------
function initNavShadow() {
    const navbar = document.querySelector('.navbar');
    if (!navbar) return;
    window.addEventListener('scroll', () => {
        navbar.style.boxShadow = window.scrollY > 10
            ? '0 4px 24px rgba(0,0,0,0.3)'
            : 'none';
    }, { passive: true });
}

// ----------------------
// Smooth scroll (hash links)
// ----------------------
function initSmoothScroll() {
    document.querySelectorAll('a[href^="#"]').forEach(anchor => {
        anchor.addEventListener('click', e => {
            const href = anchor.getAttribute('href');
            if (href === '#') return;
            const target = document.querySelector(href);
            if (target) {
                e.preventDefault();
                const offset = 80;
                window.scrollTo({
                    top: target.getBoundingClientRect().top + window.scrollY - offset,
                    behavior: 'smooth'
                });
            }
        });
    });
}

// ----------------------
// Legal page TOC highlight
// ----------------------
function initTocHighlight() {
    const sections = document.querySelectorAll('.legal-section');
    const tocLinks = document.querySelectorAll('.legal-toc a');
    if (!sections.length || !tocLinks.length) return;

    const observer = new IntersectionObserver(entries => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                tocLinks.forEach(l => l.classList.remove('active'));
                const active = document.querySelector(`.legal-toc a[href="#${entry.target.id}"]`);
                if (active) active.classList.add('active');
            }
        });
    }, { rootMargin: '-20% 0px -70% 0px' });

    sections.forEach(s => observer.observe(s));
}

// ----------------------
// Legal page mobile TOC
// ----------------------
function initLegalTocToggle() {
    document.querySelectorAll('.legal-toc').forEach(toc => {
        const button = toc.querySelector('.legal-toc-toggle');
        const panel = toc.querySelector('.legal-toc-panel');
        if (!button || !panel) return;

        button.addEventListener('click', () => {
            const open = toc.classList.toggle('open');
            button.setAttribute('aria-expanded', String(open));
        });

        panel.querySelectorAll('a').forEach(link => {
            link.addEventListener('click', () => {
                if (window.innerWidth <= 768) {
                    toc.classList.remove('open');
                    button.setAttribute('aria-expanded', 'false');
                }
            });
        });
    });
}

// ----------------------
// Init on DOM ready
// ----------------------
document.addEventListener('DOMContentLoaded', () => {
    // Apply saved theme before anything renders
    if (window.ThemeUtils) {
        window.ThemeUtils.applyTheme(window.ThemeUtils.getCurrentTheme());
    }

    // Theme toggle
    document.querySelectorAll('.theme-toggle').forEach(btn => {
        btn.addEventListener('click', () => {
            if (window.ThemeUtils) {
                window.ThemeUtils.applyTheme(window.ThemeUtils.nextTheme());
            }
        });
    });

    initMobileMenu();
    initScrollReveal();
    initStatCounters();
    initBackToTop();
    initScrollProgress();
    initNavShadow();
    initSmoothScroll();
    initTocHighlight();
    initLegalTocToggle();
});