/*
 * Card layout support for small screens.
 *
 * On phones and tablets (see mobile.css) 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 labels are reapplied (once per frame at most) whenever the
 * DOM changes. On wide screens it does nothing.
 */
(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);

        addFilterToggle(table, thead.querySelector('tr.filter-row'));
    }

    // Column filters take a lot of room above every card group, so they fold behind a
    // button that also shows how many filters are active.
    function addFilterToggle(table, filterRow) {
        if (!filterRow) return;
        let btn = table.previousElementSibling;
        if (!btn || !btn.classList.contains('card-filter-toggle')) {
            btn = document.createElement('button');
            btn.type = 'button';
            btn.className = 'card-filter-toggle';
            btn.addEventListener('click', () => { table.classList.toggle('show-filters'); updateToggle(table, btn); });
            table.parentNode.insertBefore(btn, table);
            filterRow.addEventListener('input', () => updateToggle(table, btn));
            filterRow.addEventListener('change', () => updateToggle(table, btn));
        }
        updateToggle(table, btn);
    }
    function updateToggle(table, btn) {
        const row = table.tHead && table.tHead.querySelector('tr.filter-row');
        if (!row) return;
        const active = Array.from(row.querySelectorAll('input[type="text"]')).filter(i => i.value.trim()).length
                     + row.querySelectorAll('input[type="checkbox"]:checked').length;
        const open = table.classList.contains('show-filters');
        const html = `${open ? 'Hide' : 'Show'} filters${active ? ` <span class="count">${active}</span>` : ''}`;
        if (btn.innerHTML !== html) btn.innerHTML = html;
    }

    let queued = false;
    function run() {
        queued = false;
        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);
        schedule();
    }
    if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', start);
    else start();
})();