/**
 * Tino Andri - Quantenheilung & Selbstheilung
 * JavaScript functionality
 */

document.addEventListener('DOMContentLoaded', function() {
    // Mobile navigation toggle
    const navToggle = document.querySelector('.nav-toggle');
    const navMenu = document.querySelector('.nav-menu');

    if (navToggle && navMenu) {
        navToggle.addEventListener('click', function() {
            navToggle.classList.toggle('active');
            navMenu.classList.toggle('active');
        });

        // Close menu when clicking a link
        navMenu.querySelectorAll('a').forEach(link => {
            link.addEventListener('click', () => {
                navToggle.classList.remove('active');
                navMenu.classList.remove('active');
            });
        });
    }

    // Smooth scroll for anchor links
    document.querySelectorAll('a[href^="#"]').forEach(anchor => {
        anchor.addEventListener('click', function(e) {
            e.preventDefault();
            const target = document.querySelector(this.getAttribute('href'));
            if (target) {
                const headerOffset = 80;
                const elementPosition = target.getBoundingClientRect().top;
                const offsetPosition = elementPosition + window.pageYOffset - headerOffset;

                window.scrollTo({
                    top: offsetPosition,
                    behavior: 'smooth'
                });
            }
        });
    });

    // Reveal elements on scroll
    const revealElements = document.querySelectorAll('.section');

    const revealOnScroll = () => {
        const windowHeight = window.innerHeight;

        revealElements.forEach(element => {
            const elementTop = element.getBoundingClientRect().top;
            const revealPoint = 150;

            if (elementTop < windowHeight - revealPoint) {
                element.classList.add('visible');
            }
        });
    };

    // Initial class setup
    revealElements.forEach(element => {
        element.classList.add('reveal');
    });

    // Run on load and scroll
    revealOnScroll();
    window.addEventListener('scroll', revealOnScroll, { passive: true });

    // Navigation background change on scroll
    const nav = document.querySelector('.nav');

    const updateNavOnScroll = () => {
        if (window.scrollY > 50) {
            nav.style.boxShadow = '0 2px 20px rgba(0, 0, 0, 0.1)';
        } else {
            nav.style.boxShadow = '0 2px 8px rgba(0, 0, 0, 0.06)';
        }
    };

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

    // Form submission (placeholder - replace with actual form handling)
    const contactForm = document.querySelector('.contact-form');

    if (contactForm) {
        contactForm.addEventListener('submit', function(e) {
            e.preventDefault();

            const formData = new FormData(this);
            const data = Object.fromEntries(formData);

            console.log('Form submitted:', data);

            alert('Vielen Dank für deine Nachricht! Ich werde mich bald bei dir melden.');
            this.reset();
        });
    }

    // Active navigation link highlighting
    const sections = document.querySelectorAll('section[id]');

    const highlightNav = () => {
        const scrollY = window.pageYOffset;

        sections.forEach(section => {
            const sectionHeight = section.offsetHeight;
            const sectionTop = section.offsetTop - 100;
            const sectionId = section.getAttribute('id');
            const navLink = document.querySelector(`.nav-menu a[href="#${sectionId}"]`);

            if (navLink) {
                if (scrollY > sectionTop && scrollY <= sectionTop + sectionHeight) {
                    navLink.style.color = 'var(--color-primary)';
                } else {
                    navLink.style.color = '';
                }
            }
        });
    };

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

    // =========================================================================
    // Testimonial Carousel
    // =========================================================================
    const carousel = document.querySelector('.carousel');

    if (carousel) {
        const track = carousel.querySelector('.carousel-track');
        const cards = track.querySelectorAll('.testimonial-card');
        const prevBtn = carousel.querySelector('.carousel-prev');
        const nextBtn = carousel.querySelector('.carousel-next');
        const dotsContainer = carousel.querySelector('.carousel-dots');
        const totalCards = cards.length;
        let currentIndex = 0;
        let autoAdvanceTimer = null;

        // Responsive visible count
        function getVisibleCount() {
            if (window.innerWidth <= 640) return 1;
            if (window.innerWidth <= 1024) return 2;
            return 3;
        }

        let visibleCount = getVisibleCount();

        function getMaxIndex() {
            return Math.max(0, totalCards - visibleCount);
        }

        // Build dots
        function buildDots() {
            dotsContainer.innerHTML = '';
            const dotCount = getMaxIndex() + 1;
            for (let i = 0; i < dotCount; i++) {
                const dot = document.createElement('button');
                dot.classList.add('carousel-dot');
                dot.setAttribute('aria-label', `Folie ${i + 1}`);
                if (i === currentIndex) dot.classList.add('active');
                dot.addEventListener('click', () => goTo(i));
                dotsContainer.appendChild(dot);
            }
        }

        function updateCarousel() {
            const gap = 24; // matches CSS gap
            const cardWidth = (track.clientWidth - gap * (visibleCount - 1)) / visibleCount;
            const offset = currentIndex * (cardWidth + gap);
            track.style.transform = `translateX(-${offset}px)`;

            // Update dots
            dotsContainer.querySelectorAll('.carousel-dot').forEach((dot, i) => {
                dot.classList.toggle('active', i === currentIndex);
            });

            // Update button states
            prevBtn.disabled = currentIndex === 0;
            nextBtn.disabled = currentIndex >= getMaxIndex();
        }

        function goTo(index) {
            currentIndex = Math.max(0, Math.min(index, getMaxIndex()));
            updateCarousel();
            resetAutoAdvance();
        }

        function goNext() {
            if (currentIndex >= getMaxIndex()) {
                goTo(0);
            } else {
                goTo(currentIndex + 1);
            }
        }

        function goPrev() {
            goTo(currentIndex - 1);
        }

        // Auto-advance
        function startAutoAdvance() {
            autoAdvanceTimer = setInterval(goNext, 6000);
        }

        function resetAutoAdvance() {
            clearInterval(autoAdvanceTimer);
            startAutoAdvance();
        }

        // Pause on hover
        carousel.addEventListener('mouseenter', () => clearInterval(autoAdvanceTimer));
        carousel.addEventListener('mouseleave', startAutoAdvance);

        // Button events
        prevBtn.addEventListener('click', goPrev);
        nextBtn.addEventListener('click', goNext);

        // Handle resize
        let resizeTimeout;
        window.addEventListener('resize', () => {
            clearTimeout(resizeTimeout);
            resizeTimeout = setTimeout(() => {
                const newCount = getVisibleCount();
                if (newCount !== visibleCount) {
                    visibleCount = newCount;
                    if (currentIndex > getMaxIndex()) currentIndex = getMaxIndex();
                    buildDots();
                }
                updateCarousel();
            }, 150);
        });

        // Initialize
        buildDots();
        updateCarousel();
        startAutoAdvance();
    }

    // =========================================================================
    // Accordion
    // =========================================================================
    document.querySelectorAll('.accordion-group').forEach(group => {
        const accordions = group.querySelectorAll('.accordion');

        accordions.forEach(accordion => {
            const header = accordion.querySelector('.accordion-header');

            header.addEventListener('click', () => {
                const isOpen = accordion.classList.contains('open');

                // Close all in this group
                accordions.forEach(a => a.classList.remove('open'));

                // Toggle clicked
                if (!isOpen) {
                    accordion.classList.add('open');
                }
            });
        });
    });
});