// ── Detail view ──

import { $, esc, api, fuzzyMatch } from './util.js';
import { state, parseTags, tagChipHtml, getChildren, getGroupCards, getRecent, markRecent } from './state.js';
import { renderMd, stripMd, firstImage, addCodeCopyButtons, formatTodoItems } from './markdown.js';
import { pushCardDelete, pushCardEdit, snapshotCard } from './undo.js';
import { showDialog } from './dialog.js';

const detail = $('detail');
const scroll = $('detail-scroll');
const titleEl = $('detail-title');
const bodyEl = $('detail-body');
const metaEl = $('detail-meta');
let morphTimer = null;
let morphGhost = null;
let imageFsOverlay = null;
let imageFsImg = null;
let fsScale = 1;
let fsTx = 0;
let fsTy = 0;
let fsPanning = false;
let fsStartX = 0;
let fsStartY = 0;
let fsStartTx = 0;
let fsStartTy = 0;
const FS_MIN_SCALE = 0.35;
const FS_MAX_SCALE = 8;

// ── Zoom ──

const ZOOM_KEY = 'hyprcrd-detail-zoom';

function applyZoom() {
    if (!titleEl) return;
    titleEl.style.fontSize = `${(1.125 * state.zoom).toFixed(3)}rem`;
    bodyEl.style.fontSize = `${(0.875 * state.zoom).toFixed(3)}rem`;
    metaEl.style.fontSize = `${Math.max(0.625, 0.6875 * state.zoom).toFixed(3)}rem`;
    titleEl.style.lineHeight = `${Math.max(1.35, 1.55 + (state.zoom - 1) * 0.3).toFixed(3)}`;
    bodyEl.style.lineHeight = `${Math.max(1.5, 1.7 + (state.zoom - 1) * 0.35).toFixed(3)}`;
    metaEl.style.lineHeight = `${Math.max(1.2, 1.35 + (state.zoom - 1) * 0.25).toFixed(3)}`;
}
applyZoom();

scroll?.addEventListener('wheel', e => {
    if (!detail.classList.contains('open') || !e.shiftKey || Math.abs(e.deltaY) < Math.abs(e.deltaX)) return;
    e.preventDefault();
    state.zoom = Math.min(2.2, Math.max(0.75, state.zoom + (e.deltaY < 0 ? 0.08 : -0.08)));
    state.zoom = Math.round(state.zoom * 100) / 100;
    localStorage.setItem(ZOOM_KEY, String(state.zoom));
    applyZoom();
}, { passive: false });

// ── Open / close ──

export function openDetail(id, options = {}) {
    const card = state.cards.find(c => c.id == id);
    if (!card) return;
    markRecent(id);

    const el = $('board')?.querySelector(`[data-id="${id}"]`);
    if (el) el.style.borderBottom = `3px solid ${card.color}`;

    if (!detail.classList.contains('open')) {
        state.openedFromSearch = $('search')?.classList.contains('open') || false;
        state.openedFromGallery = !!options.fromGallery;
        state.galleryOrigin = options.fromGallery ? (options.galleryOrigin || null) : null;
    } else if (options.fromGallery) {
        state.openedFromGallery = true;
        state.galleryOrigin = options.galleryOrigin || state.galleryOrigin || null;
    }
    state.viewingCard = card;

    renderSidebar(card);
    showContent(card);
    dismissStaleBanner();
    detail.classList.add('open');

    // Let plugins (collab-buckets unread-dot, etc.) react to the open.
    window.hyprcrd?.hooks?.emit?.('detail.opened', { id: card.id });
}

// ── Remote-update detection ──
//
// When a foreign edit arrives for the card the user is currently viewing,
// the pull replaces state.cards but the open detail view keeps rendering
// the stale object it captured on open. Instead of force-re-rendering
// under the user's finger (jarring when they're mid-read), surface a
// banner with a manual Reload button.

let staleBannerEl = null;

function dismissStaleBanner() {
    if (staleBannerEl) { staleBannerEl.remove(); staleBannerEl = null; }
}

function showStaleBanner(fresh) {
    dismissStaleBanner();
    const host = detail.querySelector('#detail-controls')?.parentElement;
    if (!host) return;
    const bar = document.createElement('div');
    bar.className = 'detail-stale-banner';
    bar.innerHTML = `
        <i class="ph ph-info"></i>
        <span>This card was updated${fresh?.updated_at ? ' ' + timeAgo(fresh.updated_at) : ''}.</span>
        <button class="detail-stale-reload">
            <i class="ph ph-arrows-clockwise text-xs"></i>
            <span>Reload</span>
        </button>
        <button class="detail-stale-dismiss" aria-label="Dismiss"><i class="ph ph-x text-xs"></i></button>
    `;
    host.insertBefore(bar, host.querySelector('#detail-controls').nextSibling);
    staleBannerEl = bar;
    bar.querySelector('.detail-stale-reload').addEventListener('click', () => {
        const current = state.cards.find(c => c.id == state.viewingCard?.id);
        if (current) {
            state.viewingCard = current;
            renderSidebar(current);
            showContent(current);
        }
        dismissStaleBanner();
    });
    bar.querySelector('.detail-stale-dismiss').addEventListener('click', dismissStaleBanner);
}

function timeAgo(iso) {
    const t = new Date(iso).getTime();
    if (!isFinite(t)) return '';
    const s = Math.max(0, (Date.now() - t) / 1000);
    if (s < 60)  return `${Math.floor(s)}s ago`;
    if (s < 3600) return `${Math.floor(s / 60)}m ago`;
    if (s < 86400) return `${Math.floor(s / 3600)}h ago`;
    return `${Math.floor(s / 86400)}d ago`;
}

// After every full card reload, check whether the card we're viewing is
// newer in the fresh state. If so, show the banner. Dismiss it if the
// detail view closed in the meantime.
function checkStaleViewingCard() {
    if (!detail.classList.contains('open') || !state.viewingCard) {
        dismissStaleBanner();
        return;
    }
    const viewingId = state.viewingCard.id;
    const fresh = state.cards.find(c => c.id == viewingId);
    if (!fresh) return; // card deleted — separate UX, skip banner
    const old = state.viewingCard;
    // Compare updated_at OR any field that might have changed. The detail
    // view captures viewingCard by reference on open, so a replaced
    // state.cards array (via _reloadAll) gives us a different object — if
    // any visible field differs, surface the banner.
    const changed =
        (fresh.updated_at || '') > (old.updated_at || '') ||
        (fresh.title || '')      !== (old.title || '')      ||
        (fresh.body || '')       !== (old.body || '')       ||
        (fresh.color || '')      !== (old.color || '')      ||
        (fresh.tags || '')       !== (old.tags || '');
    if (changed) showStaleBanner(fresh);
}
window.hyprcrd?.hooks?.on?.('cards.reloaded', checkStaleViewingCard);

function clearMorphGhost() {
    if (morphTimer) {
        clearTimeout(morphTimer);
        morphTimer = null;
    }
    if (morphGhost) {
        morphGhost.remove();
        morphGhost = null;
    }
}

let galleryImages = [];
let galleryIndex = 0;

function ensureImageFullscreenOverlay() {
    if (imageFsOverlay) return imageFsOverlay;

    const overlay = document.createElement('div');
    overlay.className = 'detail-image-fs-overlay';
    overlay.innerHTML = `
        <button type="button" class="detail-image-fs-close" aria-label="close image">
            <i class="ph ph-x text-xl"></i>
        </button>
        <button type="button" class="detail-image-fs-nav detail-image-fs-prev" aria-label="previous"><i class="ph ph-caret-left"></i></button>
        <button type="button" class="detail-image-fs-nav detail-image-fs-next" aria-label="next"><i class="ph ph-caret-right"></i></button>
        <div class="detail-image-fs-counter"></div>
        <div class="detail-image-fs-stage">
            <img class="detail-image-fs-img" alt="">
        </div>
    `;
    overlay.addEventListener('click', e => {
        if (e.target === overlay) closeImageFullscreen();
    });
    overlay.querySelector('.detail-image-fs-close')?.addEventListener('click', closeImageFullscreen);
    overlay.querySelector('.detail-image-fs-prev')?.addEventListener('click', e => { e.stopPropagation(); navigateGallery(-1); });
    overlay.querySelector('.detail-image-fs-next')?.addEventListener('click', e => { e.stopPropagation(); navigateGallery(1); });

    document.body.appendChild(overlay);
    imageFsOverlay = overlay;
    imageFsImg = overlay.querySelector('.detail-image-fs-img');
    if (imageFsImg) {
        imageFsImg.draggable = false;
        imageFsImg.addEventListener('mousedown', onImageFsMouseDown);
    }
    overlay.addEventListener('wheel', onImageFsWheel, { passive: false });
    document.addEventListener('mousemove', onImageFsMouseMove);
    document.addEventListener('mouseup', onImageFsMouseUp);
    return overlay;
}

function updateGalleryNav() {
    if (!imageFsOverlay) return;
    const hasGallery = galleryImages.length > 1;
    imageFsOverlay.querySelector('.detail-image-fs-prev').style.display = hasGallery ? '' : 'none';
    imageFsOverlay.querySelector('.detail-image-fs-next').style.display = hasGallery ? '' : 'none';
    const counter = imageFsOverlay.querySelector('.detail-image-fs-counter');
    counter.style.display = hasGallery ? '' : 'none';
    if (hasGallery) counter.textContent = `${galleryIndex + 1} / ${galleryImages.length}`;
}

function navigateGallery(dir) {
    if (galleryImages.length < 2) return;
    galleryIndex = (galleryIndex + dir + galleryImages.length) % galleryImages.length;
    resetImageFsTransform();
    if (imageFsImg) {
        imageFsImg.src = galleryImages[galleryIndex];
    }
    updateGalleryNav();
}

function applyImageFsTransform() {
    if (!imageFsImg) return;
    imageFsImg.style.transform = `translate(${fsTx}px, ${fsTy}px) scale(${fsScale})`;
}

function resetImageFsTransform() {
    fsScale = 1;
    fsTx = 0;
    fsTy = 0;
    fsPanning = false;
    imageFsOverlay?.classList.remove('dragging');
    applyImageFsTransform();
}

function onImageFsWheel(e) {
    if (!imageFsOverlay?.classList.contains('open') || !imageFsImg) return;
    e.preventDefault();

    const old = fsScale;
    const factor = Math.exp(-e.deltaY * 0.0015);
    const next = Math.min(FS_MAX_SCALE, Math.max(FS_MIN_SCALE, old * factor));
    if (Math.abs(next - old) < 0.0001) return;

    const r = imageFsOverlay.getBoundingClientRect();
    const cx = r.left + r.width / 2;
    const cy = r.top + r.height / 2;
    const px = e.clientX - cx;
    const py = e.clientY - cy;

    fsTx = px - ((px - fsTx) / old) * next;
    fsTy = py - ((py - fsTy) / old) * next;
    fsScale = next;
    applyImageFsTransform();
}

function onImageFsMouseDown(e) {
    if (!imageFsOverlay?.classList.contains('open')) return;
    if (e.button !== 0) return;
    e.preventDefault();
    fsPanning = true;
    fsStartX = e.clientX;
    fsStartY = e.clientY;
    fsStartTx = fsTx;
    fsStartTy = fsTy;
    imageFsOverlay.classList.add('dragging');
}

function onImageFsMouseMove(e) {
    if (!fsPanning || !imageFsOverlay?.classList.contains('open')) return;
    fsTx = fsStartTx + (e.clientX - fsStartX);
    fsTy = fsStartTy + (e.clientY - fsStartY);
    applyImageFsTransform();
}

function onImageFsMouseUp() {
    if (!fsPanning) return;
    fsPanning = false;
    imageFsOverlay?.classList.remove('dragging');
}

function openImageFullscreen(src, alt = '', gallery = []) {
    if (!src) return;
    const overlay = ensureImageFullscreenOverlay();
    resetImageFsTransform();
    galleryImages = gallery.length > 1 ? gallery : [];
    galleryIndex = galleryImages.indexOf(src);
    if (galleryIndex < 0) galleryIndex = 0;
    if (imageFsImg) {
        imageFsImg.src = src;
        imageFsImg.alt = alt || 'image';
    }
    updateGalleryNav();
    overlay.classList.add('open');
    document.body.classList.add('detail-image-fs-open');
}

function closeImageFullscreen() {
    if (!imageFsOverlay) return;
    fsPanning = false;
    imageFsOverlay.classList.remove('dragging');
    imageFsOverlay.classList.remove('open');
    document.body.classList.remove('detail-image-fs-open');
    if (imageFsImg) {
        imageFsImg.removeAttribute('src');
        imageFsImg.alt = '';
        imageFsImg.style.transform = '';
    }
    fsScale = 1;
    fsTx = 0;
    fsTy = 0;
}

function resolveMorphTarget(cardId) {
    if (state.openedFromGallery) {
        const grid = $('gallery-grid');
        if (grid) {
            if (state.galleryOrigin) {
                const exact = Array.from(grid.querySelectorAll('[data-gallery-origin]'))
                    .find(el => el.dataset.galleryOrigin === state.galleryOrigin);
                if (exact) return exact;
            }
            const byCard = grid.querySelector(`[data-card-id="${cardId}"]`);
            if (byCard) return byCard;
        }
    }

    const board = $('board');
    if (!board || !cardId) return null;

    const candidates = [];
    const pushCandidate = id => {
        if (!id) return;
        const s = String(id);
        if (!candidates.includes(s)) candidates.push(s);
    };

    // 1) direct card
    pushCandidate(cardId);

    const card = state.cards.find(c => c.id == cardId);
    if (card) {
        if (card.parent_id) {
            // 2) group parent (typical board representation for grouped cards)
            pushCandidate(card.parent_id);
            const parent = state.cards.find(c => c.id == card.parent_id);
            if (parent) {
                // 3) any visible member in expanded group view
                pushCandidate(parent.id);
                getChildren(parent.id).forEach(ch => pushCandidate(ch.id));
            }
        } else {
            const children = getChildren(card.id);
            if (children.length) {
                // parent with children: include visible members for expanded group view
                pushCandidate(card.id);
                children.forEach(ch => pushCandidate(ch.id));
            }
        }
    }

    for (const id of candidates) {
        const el = board.querySelector(`[data-id="${id}"]`);
        if (el) return el;
    }
    return null;
}

function startCloseMorph(cardId) {
    if (!cardId) return;
    if ($('search')?.classList.contains('open')) return;

    const card = state.cards.find(c => c.id == cardId);
    const panel = detail?.firstElementChild;
    const target = resolveMorphTarget(cardId);
    if (!panel || !target) return;

    // Use known inset values instead of getBoundingClientRect to avoid offset issues
    const isZen = detail.classList.contains('zen');
    const inset = isZen ? 0 : 40;
    const from = {
        left: inset,
        top: inset,
        width: window.innerWidth - inset * 2,
        height: window.innerHeight - inset * 2,
    };
    const to = target.getBoundingClientRect();
    if (from.width < 40 || from.height < 40 || to.width < 20 || to.height < 20) return;

    // Skip if target card is off-screen; morph would look broken.
    const visible = to.bottom > 0 && to.top < window.innerHeight && to.right > 0 && to.left < window.innerWidth;
    if (!visible) return;

    clearMorphGhost();

    const frame = document.createElement('div');
    frame.className = 'detail-close-frame';
    const targetCard = target.dataset.id
        ? state.cards.find(c => c.id == target.dataset.id)
        : card;
    Object.assign(frame.style, {
        position: 'fixed',
        left: `${from.left}px`,
        top: `${from.top}px`,
        width: `${from.width}px`,
        height: `${from.height}px`,
        borderColor: targetCard?.color || card?.color || 'var(--t-accent2)',
        margin: '0',
    });

    document.body.appendChild(frame);
    morphGhost = frame;

    // Force reflow so the browser commits the starting position before transitioning
    void frame.offsetWidth;

    requestAnimationFrame(() => {
        frame.style.left = `${to.left}px`;
        frame.style.top = `${to.top}px`;
        frame.style.width = `${to.width}px`;
        frame.style.height = `${to.height}px`;
        frame.style.opacity = '0.32';
        frame.style.borderRadius = '4px';
    });

    target.classList.add('card-morph-target');
    setTimeout(() => target.classList.remove('card-morph-target'), 360);

    const done = () => {
        if (frame === morphGhost) morphGhost = null;
        frame.remove();
    };
    frame.addEventListener('transitionend', done, { once: true });
    morphTimer = setTimeout(done, 430);
}

export function closeDetail(options = {}) {
    const animate = options?.animate !== false;
    const restoreGallery = options?.restoreGallery !== false;
    const cardId = state.viewingCard?.id;

    if (animate) startCloseMorph(cardId);
    else clearMorphGhost();
    closeImageFullscreen();

    detail.classList.remove('open', 'zen');
    dismissStaleBanner();
    removeZenHandles();
    document.documentElement.classList.remove('detail-zen-open');
    document.body.classList.remove('detail-zen-open');
    $('split-right')?.classList.add('hidden');
    const icon = $('detail-zen')?.querySelector('i');
    if (icon) icon.className = 'ph ph-corners-out text-sm';
    state.viewingCard = null;
    if (state.openedFromSearch) {
        state.openedFromSearch = false;
        $('search-input')?.focus();
    }
    if (state.openedFromGallery) {
        const galleryOpen = $('gallery')?.classList.contains('open');
        state.openedFromGallery = false;
        state.galleryOrigin = null;
        if (restoreGallery && !galleryOpen) window._openGallery?.();
    }
    if (state._returnToCalendar) {
        state._returnToCalendar = false;
        window._openCalendar?.();
    }
    // Return focus to body so board shortcuts work immediately.
    // Skipped when we just focused the search input (openedFromSearch).
    if (!state.openedFromSearch && document.activeElement && document.activeElement !== document.body) {
        document.activeElement.blur();
    }
}

export function showDetailCard(id) {
    const card = state.cards.find(c => c.id == id);
    if (!card) return;
    state.viewingCard = card;
    markRecent(id);

    document.querySelectorAll('#detail-sidebar-list .sidebar-card').forEach(sc => {
        const active = sc.dataset.sid == id;
        sc.classList.toggle('border-t-accent', active);
        sc.classList.toggle('bg-t-raised', active);
        sc.classList.toggle('border-transparent', !active);
    });
    showContent(card);
}

// ── Sidebar ──

function renderSidebar(card) {
    const sidebar = $('detail-sidebar');
    const list = $('detail-sidebar-list');
    const groupCards = getGroupCards(card);

    if (groupCards && groupCards.length > 1) {
        sidebar.classList.remove('hidden');
        sidebar.dataset.groupId = String(groupCards[0].id);
        $('detail-sidebar-count').textContent = groupCards.length;
        list.innerHTML = groupCards.map(gc => {
            const active = gc.id == card.id;
            const img = firstImage(gc.body);
            return `
            <div class="sidebar-card flex items-center gap-2 px-3 py-2.5 cursor-pointer border-l-2 transition-colors
                        ${active ? 'border-t-accent bg-t-raised' : 'border-transparent hover:bg-t-raised/50'}" data-sid="${gc.id}">
                <span class="w-2 h-2 rounded-full shrink-0" style="background:${gc.color}"></span>
                ${img ? `<span class="w-6 h-6 rounded-full shrink-0 bg-cover bg-center border border-t-border" style="background-image:url('${img}')"></span>` : ''}
                <span class="font-pixel text-[10px] ${active ? 'text-t-bright' : 'text-t-muted'} truncate flex-1">${esc(gc.title)}</span>
                <button onclick="event.stopPropagation();window._ungroupCard(${gc.id})" class="text-t-dim hover:text-t-danger transition-colors shrink-0 ${gc.id == groupCards[0]?.id ? 'invisible' : ''}" data-tip="ungroup">
                    <i class="ph ph-x text-[10px]"></i>
                </button>
            </div>`;
        }).join('');

        list.querySelectorAll('.sidebar-card').forEach(sc => {
            sc.addEventListener('click', () => showDetailCard(sc.dataset.sid));
        });
    } else {
        sidebar.classList.add('hidden');
        delete sidebar.dataset.groupId;
    }
}

// ── Content ──

function updateDoneButton(card) {
    const isDone = (card.tags || '').split(',').includes('done');
    const btn = $('detail-done');
    const label = $('detail-done-label');
    if (btn) {
        btn.classList.toggle('text-t-accent', isDone);
        btn.classList.toggle('border-t-accent', isDone);
    }
    if (label) label.textContent = isDone ? 'Undone' : 'Done';
}

function showContent(card) {
    $('detail-color').style.background = card.color;
    titleEl.textContent = card.title;
    updateDoneButton(card);
    const doneCorner = $('detail-done-corner');
    if (doneCorner) doneCorner.classList.toggle('hidden', !(card.tags || '').split(',').includes('done'));
    bodyEl.innerHTML = renderMd(card.body);
    addCodeCopyButtons(bodyEl);
    formatTodoItems(bodyEl);
    applyReadingResizeHandles(bodyEl);
    bindDetailImageFullscreen(bodyEl);

    // Interactive checkboxes
    bindCheckboxes(bodyEl, card);
}

export function bindCheckboxes(container, card) {
    container.querySelectorAll('.todo-item').forEach((item, idx) => {
        const btn = item.querySelector('.todo-cb');
        if (!btn) return;
        const toggle = async () => {
            let n = 0;
            const body = card.body.replace(/- \[([ x])\]/g, (m, s) => n++ === idx ? `- [${s === 'x' ? ' ' : 'x'}]` : m);
            card.body = body;
            await api(`api/cards/${card.id}`, { method: 'PATCH', body: { body } });
            const c = state.cards.find(x => x.id == card.id);
            if (c) c.body = body;
            btn.classList.toggle('checked');
            item.classList.toggle('todo-done');
            window._renderBoard();
        };
        item.addEventListener('click', toggle);
    });

    metaEl.textContent = '> created: ' + card.created_at + '  |  modified: ' + card.updated_at +
        (card.bucket_name ? '  |  bucket: ' + card.bucket_name : '');
    applyZoom();

    // Tags
    const tags = parseTags(card);
    const tagEl = $('detail-tags');
    if (tagEl) {
        if (tags.length) {
            tagEl.classList.remove('hidden');
            tagEl.innerHTML = tags.map(t => tagChipHtml(t)).join('');
            tagEl.querySelectorAll('.tag-seg[data-tag]').forEach(seg => {
                seg.addEventListener('click', e => {
                    const tag = seg.dataset.tag;
                    if (e.ctrlKey || e.metaKey) {
                        const idx = state.activeTags.indexOf(tag);
                        if (idx >= 0) state.activeTags.splice(idx, 1);
                        else state.activeTags.push(tag);
                    } else {
                        state.activeTags = [tag];
                    }
                    window._renderTagBar?.();
                    window._renderBoard();
                });
            });
        } else {
            tagEl.classList.add('hidden');
        }
    }

    // Backlinks
    const pattern = `[[${card.title}]]`.toLowerCase();
    const backlinks = state.cards.filter(c => c.id != card.id && (c.body || '').toLowerCase().includes(pattern));
    const blBox = $('detail-backlinks');
    const blList = $('detail-backlinks-list');
    if (backlinks.length) {
        blBox.classList.remove('hidden');
        blList.innerHTML = backlinks.map(b => `
            <button data-open-card="${b.id}" class="flex items-center gap-1.5 px-2 py-1 text-xs border border-t-border text-t-muted hover:border-t-accent2 hover:text-t-accent2 transition-colors">
                <span class="w-1.5 h-1.5 rounded-full shrink-0" style="background:${b.color}"></span>
                <span class="font-pixel text-[10px]">${esc(b.title)}</span>
            </button>`).join('');
        blList.querySelectorAll('[data-open-card]').forEach(btn => {
            btn.addEventListener('click', () => openDetail(btn.dataset.openCard));
        });
    } else {
        blBox.classList.add('hidden');
    }
}

function applyReadingResizeHandles(root) {
    if (!root) return;
    // Reading aid only: temporary per-block font-size scaling (not persisted).
    root.querySelectorAll('p, blockquote, pre').forEach(el => {
        el.classList.add('detail-reading-resize');

        const line = document.createElement('button');
        line.type = 'button';
        line.className = 'detail-font-dragline';
        line.dataset.tip = 'drag to resize text';
        line.setAttribute('aria-label', 'resize text');
        el.appendChild(line);

        line.addEventListener('mousedown', e => {
            e.preventDefault();
            e.stopPropagation();

            const startY = e.clientY;
            const startFont = parseFloat(getComputedStyle(el).fontSize) || 14;
            const startLineHeightPx = parseFloat(getComputedStyle(el).lineHeight);
            const lineRatio = Number.isFinite(startLineHeightPx) && startLineHeightPx > 0
                ? startLineHeightPx / startFont
                : 1.65;
            const prevSelect = document.body.style.userSelect;
            const min = 12;
            const max = 44;

            el.classList.add('resizing');
            document.body.style.userSelect = 'none';

            const onMove = ev => {
                const delta = ev.clientY - startY;
                const next = Math.min(max, Math.max(min, startFont + delta * 0.08));
                el.style.fontSize = `${next.toFixed(2)}px`;
                el.style.lineHeight = `${(next * lineRatio).toFixed(2)}px`;
            };

            const onUp = () => {
                document.removeEventListener('mousemove', onMove);
                document.removeEventListener('mouseup', onUp);
                document.body.style.userSelect = prevSelect;
                el.classList.remove('resizing');
            };

            document.addEventListener('mousemove', onMove);
            document.addEventListener('mouseup', onUp);
        });
    });
}

export function bindDetailImageFullscreen(root) {
    if (!root) return;

    // Gallery grids: single click, with prev/next
    root.querySelectorAll('.md-gallery').forEach(gallery => {
        const srcs = Array.from(gallery.querySelectorAll('img')).map(i => i.getAttribute('src'));
        gallery.querySelectorAll('.md-gallery-item').forEach(item => {
            const img = item.querySelector('img');
            if (!img) return;
            item.addEventListener('click', e => {
                e.preventDefault();
                e.stopPropagation();
                openImageFullscreen(img.getAttribute('src'), img.getAttribute('alt') || 'image', srcs);
            });
        });
    });

    // Regular images: double-click, no gallery nav
    root.querySelectorAll('img').forEach(img => {
        if (img.closest('.md-gallery')) return;
        img.dataset.tip = 'double-click to fullscreen';
        img.addEventListener('dblclick', e => {
            e.preventDefault();
            e.stopPropagation();
            openImageFullscreen(img.getAttribute('src'), img.getAttribute('alt') || 'image');
        });
    });
}

// ── Event listeners ──

// Delegated card-link clicks (replaces inline onclick)
detail.addEventListener('click', e => {
    const link = e.target.closest('.card-link[data-card-id]');
    if (link) { openDetail(link.dataset.cardId); return; }
    if (e.target === detail) closeDetail();
});
$('detail-close')?.addEventListener('click', closeDetail);

document.addEventListener('keydown', e => {
    if (!imageFsOverlay?.classList.contains('open')) return;
    if (e.key === 'ArrowLeft') { navigateGallery(-1); e.preventDefault(); return; }
    if (e.key === 'ArrowRight') { navigateGallery(1); e.preventDefault(); return; }
    if (e.key !== 'Escape') return;
    e.preventDefault();
    e.stopImmediatePropagation();
    closeImageFullscreen();
}, true);

// Zen mode
// Tree view toggle
// Extract selection to new card

const ZEN_WIDTH_KEY = 'hyprcrd-zen-width';
let zenWidth = parseInt(localStorage.getItem(ZEN_WIDTH_KEY)) || 680;
let zenHandles = [];

function applyZenWidth() {
    if (!scroll) return;
    if (detail.classList.contains('zen')) {
        scroll.style.maxWidth = zenWidth + 'px';
        // Position handles at content edges
        const margin = Math.max(0, (window.innerWidth - zenWidth) / 2);
        zenHandles.forEach(h => {
            h.el.style.left = h.side === 'left' ? (margin - 12) + 'px' : '';
            h.el.style.right = h.side === 'right' ? (margin - 12) + 'px' : '';
        });
    } else {
        scroll.style.maxWidth = '';
    }
}

function createZenHandles() {
    removeZenHandles();
    ['left', 'right'].forEach(side => {
        const el = document.createElement('div');
        Object.assign(el.style, {
            position: 'fixed', top: '0', bottom: '0', width: '24px',
            cursor: 'col-resize', zIndex: '200',
        });
        const bar = document.createElement('div');
        Object.assign(bar.style, {
            position: 'absolute', top: '50%', transform: 'translateY(-50%)',
            width: '4px', height: '48px', borderRadius: '2px',
            background: 'var(--t-muted)', opacity: '0.08', transition: 'opacity 0.2s',
        });
        bar.style[side === 'left' ? 'right' : 'left'] = '8px';
        el.appendChild(bar);

        el.addEventListener('mouseenter', () => { bar.style.opacity = '0.5'; });
        el.addEventListener('mouseleave', () => { if (!el._dragging) bar.style.opacity = '0.08'; });

        let startX, startW;
        el.addEventListener('mousedown', e => {
            e.preventDefault();
            startX = e.clientX;
            startW = zenWidth;
            el._dragging = true;
            bar.style.opacity = '0.7';
            document.body.style.cursor = 'col-resize';
            document.body.style.userSelect = 'none';

            const onMove = ev => {
                const dx = ev.clientX - startX;
                zenWidth = Math.max(400, Math.min(window.innerWidth - 80, startW + (side === 'left' ? -dx : dx) * 2));
                applyZenWidth();
            };
            const onUp = () => {
                el._dragging = false;
                bar.style.opacity = '0.08';
                document.body.style.cursor = '';
                document.body.style.userSelect = '';
                localStorage.setItem(ZEN_WIDTH_KEY, String(zenWidth));
                document.removeEventListener('mousemove', onMove);
                document.removeEventListener('mouseup', onUp);
            };
            document.addEventListener('mousemove', onMove);
            document.addEventListener('mouseup', onUp);
        });

        document.body.appendChild(el);
        zenHandles.push({ el, side });
    });
    applyZenWidth();
}

function removeZenHandles() {
    zenHandles.forEach(h => h.el.remove());
    zenHandles = [];
}

$('detail-zen')?.addEventListener('click', () => {
    detail.classList.toggle('zen');
    const isZen = detail.classList.contains('zen');
    document.documentElement.classList.toggle('detail-zen-open', isZen);
    document.body.classList.toggle('detail-zen-open', isZen);
    const icon = $('detail-zen')?.querySelector('i');
    if (icon) icon.className = isZen ? 'ph ph-corners-in text-sm' : 'ph ph-corners-out text-sm';
    if (isZen) createZenHandles();
    else { removeZenHandles(); scroll.style.maxWidth = ''; }
});

window.addEventListener('resize', () => { if (detail.classList.contains('zen')) applyZenWidth(); });

// ── Split pane (right) ──

const splitPane = $('split-right');
const splitSearch = $('split-search');
const splitPicks = $('split-picks');
const splitContent = $('split-content');

function findTaggedCards(card) {
    if (!card) return [];
    const myTags = parseTags(card);
    if (!myTags.length) return [];
    return state.cards
        .filter(c => c.id != card.id)
        .map(c => {
            const ct = parseTags(c);
            const shared = myTags.filter(t => ct.some(ct2 => ct2 === t || ct2.startsWith(t + '/') || t.startsWith(ct2 + '/')));
            return shared.length ? { card: c, score: shared.length } : null;
        })
        .filter(Boolean)
        .sort((a, b) => b.score - a.score)
        .slice(0, 12)
        .map(s => s.card);
}

function findRelatedCards(card) {
    if (!card) return [];
    const id = card.id;
    const title = (card.title || '').toLowerCase();
    const body = (card.body || '').toLowerCase();

    const stopwords = new Set(['the','and','for','that','this','with','from','are','was','were','been','have','has','had','not','but','what','all','can','her','his','how','its','may','new','now','old','see','way','who','did','get','let','say','she','too','use','eine','ein','der','die','das','und','ist','von','mit','den','dem','des','auf','fuer','auch','sich','noch','wie','man','aber','nach','bei','nur','dann','wenn','oder','als','bis','zum','zur','kann','doch','ich','wir','sie','aus','vor']);
    const words = `${card.title} ${stripMd(card.body)}`.toLowerCase()
        .split(/[^a-zA-Z0-9äöüß]+/)
        .filter(w => w.length >= 3 && !stopwords.has(w));
    const wordSet = [...new Set(words)];

    return state.cards
        .filter(c => c.id != id)
        .map(c => {
            let score = 0;
            const ct = (c.title || '').toLowerCase();
            const cb = stripMd(c.body || '').toLowerCase();

            if (body.includes(`[[${c.title.toLowerCase()}]]`)) score += 80;
            if ((c.body || '').toLowerCase().includes(`[[${title}]]`)) score += 80;
            if (card.bucket_id && c.bucket_id == card.bucket_id) score += 15;
            if (card.parent_id && c.parent_id == card.parent_id) score += 20;

            for (const w of wordSet) {
                if (ct.includes(w)) score += 6;
                if (cb.includes(w)) score += 2;
            }

            return score > 0 ? { card: c, score } : null;
        })
        .filter(Boolean)
        .sort((a, b) => b.score - a.score)
        .slice(0, 12)
        .map(s => s.card);
}

function renderSplitGroup(cards, label) {
    if (!cards.length) return '';
    return `<div class="px-3 pt-2 pb-1"><span class="font-pixel text-[9px] text-t-dim uppercase tracking-wider">${label}</span></div>` +
        cards.map(c => `<div class="split-pick" data-split-card="${c.id}">
            <span class="sp-dot" style="background:${c.color}"></span>
            <span class="font-pixel text-[10px] truncate flex-1">${esc(c.title)}</span>
            ${c.bucket_name ? `<span class="text-[8px] text-t-dim font-pixel">${esc(c.bucket_name)}</span>` : ''}
        </div>`).join('');
}

function renderSplitPicks(cards, label) {
    if (!cards.length) {
        splitPicks.innerHTML = `<div class="px-3 py-4 text-center text-t-dim font-pixel text-[9px] cursor-blink">no matches</div>`;
        return;
    }
    splitPicks.innerHTML = renderSplitGroup(cards, label);
    splitPicks.querySelectorAll('[data-split-card]').forEach(el => {
        el.addEventListener('click', () => loadSplitCard(el.dataset.splitCard));
    });
}

function renderSplitGroups(groups) {
    const html = groups.filter(g => g.cards.length).map(g => renderSplitGroup(g.cards, g.label)).join('');
    if (!html) {
        splitPicks.innerHTML = `<div class="px-3 py-4 text-center text-t-dim font-pixel text-[9px] cursor-blink">no matches</div>`;
        return;
    }
    splitPicks.innerHTML = html;
    splitPicks.querySelectorAll('[data-split-card]').forEach(el => {
        el.addEventListener('click', () => loadSplitCard(el.dataset.splitCard));
    });
}

function searchAllCards(query) {
    const q = query.toLowerCase().trim();
    const parts = q.split(/\s+/).filter(Boolean);
    const tagFilters = parts.filter(p => p.startsWith('#') && p.length > 1).map(p => p.substring(1));
    const words = parts.filter(p => !p.startsWith('#'));
    const textQ = words.join(' ');

    let pool = state.cards.filter(c => c.id != state.viewingCard?.id);
    if (tagFilters.length) {
        pool = pool.filter(c => {
            const ct = parseTags(c);
            return tagFilters.every(tf => ct.some(t => t === tf || t.startsWith(tf + '/') || t.includes(tf)));
        });
    }
    if (!words.length) return pool.slice(0, 15);

    return pool
        .map(c => {
            const t = (c.title || '').toLowerCase();
            const b = stripMd(c.body || '').toLowerCase();
            const tags = (c.tags || '').toLowerCase();
            let score = tagFilters.length ? 30 : 0;
            if (t.includes(textQ)) score += 50;
            if (t.startsWith(textQ)) score += 20;
            if (b.includes(textQ)) score += 10;
            if (tags.includes(textQ)) score += 40;
            for (const w of words) {
                if (t.includes(w)) score += 15;
                if (b.includes(w)) score += 5;
                if (tags.includes(w)) score += 20;
            }
            if (!score) {
                const fm = fuzzyMatch(textQ, t);
                if (fm !== null) score += 5 + fm;
            }
            return score > 0 ? { card: c, score } : null;
        })
        .filter(Boolean)
        .sort((a, b) => b.score - a.score)
        .slice(0, 15)
        .map(s => s.card);
}

let splitCardId = null;
let splitLastQuery = '';

function restoreSplitList() {
    if (splitLastQuery) {
        splitSearch.value = splitLastQuery;
        const results = searchAllCards(splitLastQuery);
        renderSplitPicks(results, `${results.length} result${results.length !== 1 ? 's' : ''}`);
    } else {
        openSplitPane();
    }
    splitContent.innerHTML = '';
}

function loadSplitCard(id) {
    const card = state.cards.find(c => c.id == id);
    if (!card) return;
    splitCardId = id;
    splitPicks.innerHTML = `<div class="flex items-center border-b border-t-border">
        <button id="split-back" class="flex items-center gap-1.5 flex-1 px-3 py-2 text-xs text-t-muted hover:text-t-accent hover:bg-t-raised transition-colors">
            <i class="ph ph-arrow-left text-sm"></i><span class="font-pixel text-[10px]">${splitLastQuery ? 'results' : 'related cards'}</span>
        </button>
        <button id="split-promote" class="flex items-center gap-1.5 px-3 py-2 text-xs text-t-muted hover:text-t-accent hover:bg-t-raised transition-colors" data-tip="open as main card">
            <i class="ph ph-arrow-line-left text-sm"></i><span class="font-pixel text-[10px]">Focus</span>
        </button>
    </div>`;
    splitPicks.querySelector('#split-back').addEventListener('click', restoreSplitList);
    splitPicks.querySelector('#split-promote').addEventListener('click', () => promoteSplitCard(id));
    splitSearch.value = '';
    splitContent.innerHTML = `
        <div class="card-bar w-16 mb-3 rounded-sm" style="background:${card.color}"></div>
        <h2 class="font-pixel text-t-bright text-sm mb-3 leading-relaxed">${esc(card.title)}</h2>
        <div class="prose text-xs text-t-text">${renderMd(card.body)}</div>
        <div class="mt-6 pt-3 border-t border-t-border text-[10px] text-t-dim font-pixel">
            > ${card.created_at}${card.bucket_name ? '  |  ' + esc(card.bucket_name) : ''}
        </div>`;
    splitContent.querySelectorAll('.card-link[data-card-id]').forEach(link => {
        link.addEventListener('click', () => loadSplitCard(link.dataset.cardId));
    });
    bindCheckboxes(splitContent, card);
    addCodeCopyButtons(splitContent);
    formatTodoItems(splitContent);
}

function promoteSplitCard(id) {
    // Open the split card as the main detail card, then refresh related in split pane
    openDetail(id);
    openSplitPane();
}

function openSplitPane() {
    if (!splitPane) return;
    splitPane.classList.remove('hidden');
    splitSearch.value = '';
    splitLastQuery = '';
    splitContent.innerHTML = '';
    const tagged = findTaggedCards(state.viewingCard);
    const related = findRelatedCards(state.viewingCard);
    // Dedupe: remove tagged cards from related
    const taggedIds = new Set(tagged.map(c => c.id));
    const relatedOnly = related.filter(c => !taggedIds.has(c.id));
    renderSplitGroups([
        { label: 'tags', cards: tagged },
        { label: 'related', cards: relatedOnly },
    ]);
    splitSearch.focus();
}

$('split-right-btn')?.addEventListener('click', () => {
    if (splitPane.classList.contains('hidden')) openSplitPane();
});

$('split-close')?.addEventListener('click', () => splitPane.classList.add('hidden'));

splitSearch?.addEventListener('input', () => {
    const q = splitSearch.value.trim();
    splitLastQuery = q;
    splitContent.innerHTML = '';
    if (!q) {
        const tagged = findTaggedCards(state.viewingCard);
        const related = findRelatedCards(state.viewingCard);
        const taggedIds = new Set(tagged.map(c => c.id));
        const relatedOnly = related.filter(c => !taggedIds.has(c.id));
        renderSplitGroups([
            { label: 'tags', cards: tagged },
            { label: 'related', cards: relatedOnly },
        ]);
        return;
    }
    const results = searchAllCards(q);
    renderSplitPicks(results, `${results.length} result${results.length !== 1 ? 's' : ''}`);
});

splitSearch?.addEventListener('keydown', e => {
    if (e.key === 'Escape') { splitPane.classList.add('hidden'); e.stopPropagation(); }
    if (e.key === 'Enter') {
        const first = splitPicks.querySelector('[data-split-card]');
        if (first) loadSplitCard(first.dataset.splitCard);
    }
});

$('detail-edit')?.addEventListener('click', () => {
    if (!state.viewingCard) return;
    const card = state.viewingCard;
    const fromGallery = state.openedFromGallery;
    const fromCalendar = state._returnToCalendar;
    state.openedFromSearch = false;
    state.openedFromGallery = false;
    state.galleryOrigin = null;
    state.returnToGalleryAfterEdit = fromGallery;
    state._returnToCalendar = false;
    closeDetail({ animate: false, restoreGallery: false });
    // Hide calendar so modal is visible
    if (fromCalendar) {
        $('calendar')?.classList.remove('open');
        state._returnToCalendar = true;
    }
    $('gallery')?.classList.remove('open');
    window._closeSearch();
    window._openModal(card);
});

$('detail-done')?.addEventListener('click', async () => {
    const card = state.viewingCard;
    if (!card) return;
    const isDone = (card.tags || '').split(',').includes('done');
    let newBody;
    if (isDone) {
        newBody = card.body.replace(/\s*#done\b/g, '');
    } else {
        newBody = (card.body || '').trimEnd() + ' #done';
    }
    await api(`api/cards/${card.id}`, { method: 'PATCH', body: { body: newBody, due_date: isDone ? card.due_date : null } });
    card.body = newBody;
    if (!isDone) card.due_date = null;
    const c = state.cards.find(x => x.id == card.id);
    if (c) { c.body = newBody; c.tags = newBody.match(/#[a-z0-9_/-]+/gi)?.map(t => t.substring(1).toLowerCase()).join(',') || ''; if (!isDone) c.due_date = null; }
    showContent(card);
    window._renderBoard();
    const doneCorner = $('detail-done-corner');
    if (doneCorner) doneCorner.classList.toggle('hidden', !newBody.includes('#done'));
});

$('detail-delete')?.addEventListener('click', async () => {
    if (!state.viewingCard) return;
    if (localStorage.getItem('hyprcrd-confirm-delete') !== '0') {
        const ok = await showDialog({ title: 'delete_card', message: `Really delete "${state.viewingCard.title}"?`, danger: true, okLabel: 'Delete' });
        if (!ok) return;
    }
    pushCardDelete('delete', snapshotCard(state.viewingCard));
    await api(`api/cards/${state.viewingCard.id}`, { method: 'DELETE' });
    state.galleryOrigin = null;
    closeDetail({ animate: false, restoreGallery: false });
    await window._reloadAll();
});

export async function ungroupCard(id) {
    await api(`api/cards/${id}`, { method: 'PATCH', body: { parent_id: null } });
    await window._reloadAll();
    if (state.viewingCard) openDetail(state.viewingCard.id == id ? id : state.viewingCard.id);
}