/*
 * Layout helpers (see layout.css).
 *
 * Sticky headers: measures the top nav and each table's group header so the column
 * header rows can stick directly beneath them (--nav-h, --sticky-top, --thead-r1).
 *
 * Card view: on phones and tablets each table row is shown as a card, with every cell
 * rendered as "Column name: value". CSS can't look up a cell's column header, so this
 * copies each header's text onto its cells as data-label.
 *
 * The dashboard re-renders its tables constantly, so both are reapplied (once per frame
 * at most) whenever the DOM changes.
 */
(function () {
    'use strict';

    const cardsQuery = window.matchMedia('(max-width: 1100px)');
    const clean = text => text.replace(/[\u2195\u25B2\u25BC\u00D7\u2715]/g, '').replace(/\s+/g, ' ').trim();

    function labelTable(table) {
        const thead = table.tHead;
        if (!thead) return;

        // The header row is the one with the most text (Custom View has a drag-handle row above it)
        let headerRow = null, best = -1;
        for (const row of thead.rows) {
            if (row.classList.contains('filter-row')) continue;
            const named = Array.from(row.cells).filter(c => clean(c.textContent)).length;
            if (named > best) { best = named; headerRow = row; }
        }
        if (!headerRow) return;

        for (const row of thead.rows) {
            if (row === headerRow) row.classList.add('card-label-row');
            else if (!row.classList.contains('filter-row')) row.classList.add('card-aux-row');
        }

        const labels = Array.from(headerRow.cells).map(c => clean(c.textContent));
        const apply = row => {
            Array.from(row.cells).forEach((cell, i) => {
                const label = cell.colSpan > 1 ? '' : (labels[i] || '');
                if (cell.dataset.label !== label) cell.dataset.label = label;
            });
        };
        thead.querySelectorAll('tr.filter-row').forEach(apply);
        for (const body of table.tBodies) for (const row of body.rows) apply(row);

    }

    // --- Sticky offsets ---------------------------------------------------------------
    function setVar(el, name, value) {
        if (el.style.getPropertyValue(name) !== value) el.style.setProperty(name, value);
    }
    function groupHeaderFor(table) {
        // The group header is a sibling of the table or of its wrapper
        for (let el = table.parentElement, depth = 0; el && depth < 3; el = el.parentElement, depth++) {
            const gh = el.querySelector(':scope > .group-header');
            if (gh) return gh;
        }
        return null;
    }
    function updateSticky() {
        const root = document.documentElement;
        const nav = document.querySelector('.top-nav');
        const navH = nav ? nav.getBoundingClientRect().height : 60;
        setVar(root, '--nav-h', navH + 'px');
        const dock = document.getElementById('usmt-term');
        setVar(root, '--dock-h', (dock ? Math.ceil(dock.getBoundingClientRect().height) : 0) + 'px');

        document.querySelectorAll('table.master-table').forEach(table => {
            if (!table.offsetParent) return;                    // hidden page/group: keep old values
            const gh = groupHeaderFor(table);
            const ghH = gh && getComputedStyle(gh).position === 'sticky' ? gh.getBoundingClientRect().height : 0;
            // 1px overlap tucks the table header under the group header: no hairline gap
            const top = Math.max(0, navH + ghH - 1) + 'px';
            setVar(table, '--sticky-top', top);
            if (table.parentElement) setVar(table.parentElement, '--sticky-top', top);   // for the filter chip bar
        });
        setupCustomHScroll();
    }

    // Custom View can be wider than the page. A sideways-scrolling box would stop its header
    // from sticking, so the box clips instead (overflow-x: clip) and the table is shifted
    // sideways by a scrollbar pinned to the bottom of the window. Wheel, shift+wheel and
    // touch swipes over the table drive the same scrollbar.
    function setupCustomHScroll() {
        const box = document.getElementById('scroll-custom');
        const host = document.getElementById('custom-table-host');
        const table = document.getElementById('table-custom');
        if (!box || !host || !table) return;
        let bar = document.getElementById('custom-hscroll');
        if (!bar) {
            bar = document.createElement('div');
            bar.id = 'custom-hscroll';
            bar.className = 'custom-hscroll no-copy';
            bar.appendChild(document.createElement('div'));
            box.insertAdjacentElement('afterend', bar);
            const applyX = () => { host.style.transform = bar.scrollLeft ? `translateX(${-bar.scrollLeft}px)` : ''; };
            bar.addEventListener('scroll', applyX, { passive: true });
            box.addEventListener('wheel', e => {
                if (bar.hidden) return;
                const dx = Math.abs(e.deltaX) > Math.abs(e.deltaY) ? e.deltaX : (e.shiftKey ? e.deltaY : 0);
                if (!dx) return;
                e.preventDefault();
                bar.scrollLeft += dx;
            }, { passive: false });
            let start = null;
            box.addEventListener('touchstart', e => {
                if (bar.hidden || e.touches.length !== 1) { start = null; return; }
                start = { x: e.touches[0].clientX, y: e.touches[0].clientY, left: bar.scrollLeft, lock: null };
            }, { passive: true });
            box.addEventListener('touchmove', e => {
                if (!start) return;
                const dx = e.touches[0].clientX - start.x, dy = e.touches[0].clientY - start.y;
                if (!start.lock && Math.hypot(dx, dy) > 8) start.lock = Math.abs(dx) > Math.abs(dy) ? 'x' : 'y';
                if (start.lock === 'x') { e.preventDefault(); bar.scrollLeft = start.left - dx; }
            }, { passive: false });
            box.addEventListener('touchend', () => { start = null; }, { passive: true });
        }
        if (cardsQuery.matches || !table.offsetParent) {
            bar.hidden = true;
            if (host.style.transform) host.style.transform = '';
            return;
        }
        const full = Math.ceil(table.getBoundingClientRect().width);
        const view = box.clientWidth;
        const inner = bar.firstChild;
        if (inner.style.width !== full + 'px') inner.style.width = full + 'px';
        const hide = full <= view + 1;
        if (bar.hidden !== hide) bar.hidden = hide;
        if (hide && bar.scrollLeft) { bar.scrollLeft = 0; host.style.transform = ''; }
    }

    // Auto-sizing text boxes (Workbench stacks) only grow while typing in the original;
    // size them to their contents whenever they're shown or re-rendered too.
    function autosizeTextareas() {
        document.querySelectorAll('textarea.auto-resize').forEach(t => {
            if (!t.offsetParent || document.activeElement === t) return;
            if (Math.abs(t.scrollHeight - t.clientHeight) <= 2) return;
            t.style.height = 'auto';
            t.style.height = t.scrollHeight + 'px';
        });
    }

    let queued = false;
    function run() {
        queued = false;
        updateSticky();
        autosizeTextareas();
        if (!cardsQuery.matches) return;
        document.querySelectorAll('table.master-table').forEach(labelTable);
    }
    function schedule() {
        if (queued) return;
        queued = true;
        requestAnimationFrame(run);
    }

    function start() {
        new MutationObserver(schedule).observe(document.body, { childList: true, subtree: true });
        if (cardsQuery.addEventListener) cardsQuery.addEventListener('change', schedule);
        else cardsQuery.addListener(schedule);
        window.addEventListener('resize', schedule);
        // Groups and pages are shown by toggling display (not a DOM change), so also
        // re-measure as the user scrolls; writes only happen when a value changes.
        window.addEventListener('scroll', schedule, { passive: true });
        // Page switches show and hide pages without changing the DOM
        if (typeof window.switchPage === 'function') {
            const orig = window.switchPage;
            window.switchPage = function () { const r = orig.apply(this, arguments); schedule(); return r; };
        }
        // The terminal dock opens, closes and resizes without a page resize
        if (window.ResizeObserver) {
            const watchDock = () => {
                const dock = document.getElementById('usmt-term');
                if (dock) new ResizeObserver(schedule).observe(dock); else setTimeout(watchDock, 500);
            };
            watchDock();
        }
        schedule();
    }
    if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', start);
    else start();
})();