// ─── Scroll reveal ─────────────────────────────────────────
const reveals = document.querySelectorAll('.reveal');
const revealObserver = new IntersectionObserver((entries, observer) => {
    entries.forEach((entry) => {
        if (!entry.isIntersecting) {
            return;
        }

        entry.target.classList.add('visible');
        observer.unobserve(entry.target);
    });
}, {threshold: 0.1, rootMargin: '0px 0px -40px 0px'});
reveals.forEach((element) => revealObserver.observe(element));

// ─── Active nav link on scroll ──────────────────────────────
const sections = Array.from(document.querySelectorAll('section[id]'));
const navLinks = Array.from(document.querySelectorAll('.nav-links a'));
const updateActiveNavLink = () => {
    let currentSectionId = '';

    sections.forEach((section) => {
        if (window.scrollY >= section.offsetTop - 120) {
            currentSectionId = section.id;
        }
    });

    navLinks.forEach((link) => {
        const isActive = link.getAttribute('href') === `#${currentSectionId}`;
        link.classList.toggle('is-active', isActive);
    });
};
window.addEventListener('scroll', updateActiveNavLink, {passive: true});
updateActiveNavLink();

// ─── Project card links + filters ───────────────────────────
const filterChips = Array.from(document.querySelectorAll('.filter-chip'));
const projectCards = Array.from(document.querySelectorAll('#project-grid .project-card'));
const seeMoreButton = document.querySelector('#projects-see-more');
const cardLinks = document.querySelectorAll('.card-link[data-href]');
const DEFAULT_VISIBLE_PROJECTS = 9;
const interactiveSelector = 'a, button, input, textarea, select, summary, [role="button"]';

const isNestedInteractiveTarget = (card, target) => {
    if (!(target instanceof Element)) {
        return false;
    }

    const interactiveAncestor = target.closest(interactiveSelector);
    return interactiveAncestor !== null && interactiveAncestor !== card;
};

const goToCardHref = (card, event) => {
    const href = card.dataset.href;
    if (!href) {
        return;
    }

    const openInNewTab = event.metaKey || event.ctrlKey || event.button === 1;
    if (openInNewTab) {
        window.open(href, '_blank', 'noopener');
        return;
    }

    globalThis.location.href = href;
};

cardLinks.forEach((card) => {
    card.setAttribute('role', 'link');
    card.setAttribute('tabindex', '0');

    card.addEventListener('click', (event) => {
        if (isNestedInteractiveTarget(card, event.target)) {
            return;
        }

        goToCardHref(card, event);
    });

    card.addEventListener('keydown', (event) => {
        if (event.key !== 'Enter' && event.key !== ' ') {
            return;
        }

        if (isNestedInteractiveTarget(card, event.target)) {
            return;
        }

        event.preventDefault();
        goToCardHref(card, event);
    });
});

if (filterChips.length > 0 && projectCards.length > 0) {
    let selectedFilter = 'all';
    let isExpanded = false;

    const techByCard = new Map(
        projectCards.map((card) => [card, (card.dataset.tech || '').split(/\s+/).filter(Boolean)]),
    );

    const applyFilter = () => {
        const visibleCards = [];

        projectCards.forEach((card) => {
            const tech = techByCard.get(card) || [];
            const shouldShow = selectedFilter === 'all' || tech.includes(selectedFilter);
            card.classList.toggle('is-hidden', !shouldShow);

            if (!shouldShow) {
                return;
            }

            card.classList.remove('is-collapsed');
            visibleCards.push(card);
        });

        if (!isExpanded) {
            visibleCards.slice(DEFAULT_VISIBLE_PROJECTS).forEach((card) => {
                card.classList.add('is-collapsed');
            });
        }

        if (!seeMoreButton) {
            return;
        }

        const canExpand = visibleCards.length > DEFAULT_VISIBLE_PROJECTS;
        seeMoreButton.hidden = !canExpand;
        seeMoreButton.setAttribute('aria-expanded', canExpand && isExpanded ? 'true' : 'false');
        seeMoreButton.textContent = isExpanded ? 'See less' : 'See more';
    };

    filterChips.forEach((chip) => {
        chip.addEventListener('click', () => {
            selectedFilter = chip.dataset.filter || 'all';
            isExpanded = false;

            filterChips.forEach((otherChip) => {
                otherChip.classList.toggle('active', otherChip === chip);
            });

            applyFilter();
        });
    });

    if (seeMoreButton) {
        seeMoreButton.addEventListener('click', () => {
            isExpanded = !isExpanded;
            applyFilter();
        });
    }

    applyFilter();
}