const root = document.documentElement;
const saved = window?.localStorage?.getItem('theme');

// Umami: safe track (no-op if script blocked or not loaded)
function umamiTrack(name, data) {
    if (
        typeof window.umami !== 'undefined' &&
        typeof window.umami.track === 'function'
    ) {
        if (data != null) window.umami.track(name, data);
        else window.umami.track(name);
    }
}
const sysDark = window.matchMedia('(prefers-color-scheme: dark)').matches;

if (saved) {
    root.setAttribute('data-theme', saved);
} else {
    if (sysDark) {
        root.setAttribute('data-theme', 'dark');
    } else {
        root.setAttribute('data-theme', 'light');
    }
}

// Theme toggle
const themeToggle = document.getElementById('theme-toggle');
if (themeToggle) {
    themeToggle.addEventListener('click', () => {
        const current = root.getAttribute('data-theme') || 'light';
        const next = current === 'light' ? 'dark' : 'light';
        root.setAttribute('data-theme', next);
        try {
            localStorage.setItem('theme', next);
        } catch {
            /* localStorage unavailable (e.g. private browsing) */
        }
    });
}

// Umami: scroll depth (25%, 50%, 75%, 100%) – once per milestone
const scrollMilestones = new Set();
function onScroll() {
    const doc = document.documentElement;
    const scrollTop = doc.scrollTop || document.body.scrollTop;
    const scrollHeight =
        (doc.scrollHeight || document.body.scrollHeight) - window.innerHeight;
    if (scrollHeight <= 0) return;
    const pct = Math.round((scrollTop / scrollHeight) * 100);
    for (const m of [25, 50, 75, 100]) {
        if (pct >= m && !scrollMilestones.has(m)) {
            scrollMilestones.add(m);
            umamiTrack('scroll-depth', { depth: String(m) });
        }
    }
}
window.addEventListener('scroll', onScroll, { passive: true });

// Lightbox (structure from Lightbox.svelte; we fill content and handle open/close)
const dialog = document.querySelector('dialog.lightbox');
const lbContent = dialog?.querySelector('.lb-content');
const lbCaption = dialog?.querySelector('#lb-caption, .lb-caption');
let lightboxOpener = null;

function openLightbox(name, type, caption) {
    if (!dialog || !lbContent || !lbCaption) return;
    lightboxOpener = document.activeElement;
    document.body.style.overflow = 'hidden';

    if (type === 'video') {
        const video = document.createElement('video');
        video.src = `/assets/media/videos/${name}.mp4`;
        video.controls = true;
        video.autoplay = true;
        const track = document.createElement('track');
        track.kind = 'captions';
        track.src = `/assets/media/videos/${name}-captions.vtt`;
        track.default = true;
        video.appendChild(track);
        lbContent.replaceChildren(video);
    } else {
        const srcset = (bp) =>
            type === 'image'
                ? `/assets/media/${bp}/${name}@1x.webp 1x, /assets/media/${bp}/${name}.webp 2x`
                : `/assets/media/${bp}/${name}_still@1x.webp 1x, /assets/media/${bp}/${name}_still.webp 2x`;
        const picture = document.createElement('picture');
        const s1 = document.createElement('source');
        s1.media = '(min-width:1024px)';
        s1.srcset = srcset('desktop');
        const s2 = document.createElement('source');
        s2.media = '(min-width:768px)';
        s2.srcset = srcset('tablet');
        const s3 = document.createElement('source');
        s3.media = '(min-width:0px)';
        s3.srcset = srcset('mobile');
        const img = document.createElement('img');
        img.src = `/assets/media/thumbnail/${name}.webp`;
        img.alt = '';
        picture.append(s1, s2, s3, img);
        lbContent.replaceChildren(picture);
    }
    lbCaption.textContent = caption || '';
    umamiTrack('gallery-view', { name, type });
    dialog.removeAttribute('inert');
    dialog.setAttribute('aria-hidden', 'false');
    dialog.showModal();
}

function closeLightbox() {
    if (!dialog) return;
    if (lightboxOpener && typeof lightboxOpener.focus === 'function') {
        lightboxOpener.focus();
    }
    lightboxOpener = null;
    document.body.style.overflow = '';
    if (lbContent) lbContent.replaceChildren();
    if (lbCaption) lbCaption.textContent = '';
    dialog.setAttribute('aria-hidden', 'true');
    dialog.setAttribute('inert', '');
    dialog.close();
}

if (dialog) {
    // Add event handlers
    dialog.querySelector('.lb-close').addEventListener('click', closeLightbox);
    dialog.querySelector('.lb-close').addEventListener('keydown', (e) => {
        if (e.key === 'Enter' || e.key === ' ') {
            e.preventDefault();
            closeLightbox();
        }
    });
    dialog.addEventListener('close', closeLightbox);
    dialog.addEventListener('cancel', closeLightbox);
    dialog.addEventListener('click', (e) => {
        if (e.target === dialog) closeLightbox();
    });
}

// Gallery items
document.querySelectorAll('.gallery-item[data-name]').forEach((el) => {
    el.addEventListener('click', () => {
        const name = el.getAttribute('data-name');
        const type = el.getAttribute('data-type') || 'image';
        const caption = el.getAttribute('data-caption') || '';
        if (name) openLightbox(name, type, caption);
    });
    el.addEventListener('keydown', (e) => {
        if (e.key === 'Enter' || e.key === ' ') {
            e.preventDefault();
            const name = el.getAttribute('data-name');
            const type = el.getAttribute('data-type') || 'image';
            const caption = el.getAttribute('data-caption') || '';
            if (name) openLightbox(name, type, caption);
        }
    });
});

// Show video button (open lightbox with tour)
const showVideoBtn = document.getElementById('show_video');
if (showVideoBtn) {
    const openTour = () => {
        const name = showVideoBtn.getAttribute('data-name') || 'tour';
        const type = showVideoBtn.getAttribute('data-type') || 'video';
        const caption =
            showVideoBtn.getAttribute('data-caption') ||
            "Take the scenic route—explore your the home's highlights with a virtual walkthrough.";
        openLightbox(name, type, caption);
    };
    showVideoBtn.addEventListener('click', openTour);
    showVideoBtn.addEventListener('keydown', (e) => {
        if (e.key === 'Enter' || e.key === ' ') {
            e.preventDefault();
            openTour();
        }
    });
}