// Behaviour the server-rendered pages need in the browser: theme, display
// mode, search and machine filter, the Live box, local times, copy buttons and
// the revoke popovers. The pages work without it; htmx and the SSE extension
// do the live updates. Everything stored in the browser is wrapped in
// try/catch because storage can be blocked.
(function () {
  'use strict';
  var root = document.documentElement;

  function load(area, key) {
    try { return window[area].getItem(key); } catch (e) { return null; }
  }
  function save(area, key, value) {
    try { window[area].setItem(key, value); } catch (e) { /* storage is blocked */ }
  }
  function each(selector, fn) {
    Array.prototype.forEach.call(document.querySelectorAll(selector), fn);
  }

  // Theme: the head script set the initial class; the toggle overrides it.
  var colorScheme = window.matchMedia ? window.matchMedia('(prefers-color-scheme: light)') : null;
  var themeButton = document.getElementById('theme-toggle');
  if (themeButton) {
    themeButton.addEventListener('click', function () {
      var light = !root.classList.contains('t-light');
      root.classList.toggle('t-light', light);
      themeButton.setAttribute('aria-pressed', String(light));
      save('localStorage', 'pu-theme', light ? 'light' : 'dark');
    });
    themeButton.setAttribute('aria-pressed', String(root.classList.contains('t-light')));
  }
  if (colorScheme && colorScheme.addEventListener) {
    colorScheme.addEventListener('change', function (e) {
      if (!load('localStorage', 'pu-theme')) root.classList.toggle('t-light', e.matches);
    });
  }

  // Display mode: icon, icon + text, or text.
  function setDisplay(mode) {
    ['icon', 'both', 'text'].forEach(function (m) { root.classList.toggle('d-' + m, m === mode); });
    each('[data-display]', function (b) { b.setAttribute('aria-pressed', String(b.dataset.display === mode)); });
  }
  setDisplay(root.classList.contains('d-icon') ? 'icon' : root.classList.contains('d-text') ? 'text' : 'both');

  // Search and machine filter. The rows are all in the page; this hides them.
  var filter = { q: '', machine: '' };
  try {
    var saved = JSON.parse(load('sessionStorage', 'pu-filter') || '{}');
    if (typeof saved.q === 'string') filter.q = saved.q;
    if (typeof saved.machine === 'string') filter.machine = saved.machine;
  } catch (e) { /* ignore a broken saved filter */ }
  var search = document.getElementById('q');
  if (search) search.value = filter.q;

  // The machine list is hidden on narrow screens; a filter that cannot be
  // seen or cleared there is ignored. Search still applies.
  var narrow = window.matchMedia ? window.matchMedia('(max-width:760px)') : null;

  function applyFilter() {
    var box = document.getElementById('services');
    if (!box) return;
    var groups = box.querySelectorAll('.grp');
    var known = Array.prototype.some.call(groups, function (g) { return g.dataset.key === filter.machine; });
    if (filter.machine && !known) filter.machine = '';
    var machine = narrow && narrow.matches ? '' : filter.machine;
    var q = filter.q.trim().toLowerCase();
    var any = false;
    Array.prototype.forEach.call(groups, function (g) {
      var inMachine = !machine || g.dataset.key === machine;
      var shown = 0;
      Array.prototype.forEach.call(g.querySelectorAll('.row'), function (row) {
        var match = inMachine && (!q || (row.dataset.search || '').indexOf(q) !== -1);
        row.hidden = !match;
        if (match) shown++;
      });
      g.hidden = shown === 0;
      if (shown > 0) any = true;
    });
    var none = document.getElementById('nomatch');
    if (none) none.hidden = any || groups.length === 0;
    each('#machines a', function (a) {
      var cur = a.dataset.machine === filter.machine;
      a.classList.toggle('cur', cur);
      if (cur) a.setAttribute('aria-current', 'true'); else a.removeAttribute('aria-current');
    });
  }
  if (narrow && narrow.addEventListener) narrow.addEventListener('change', function () { applyFilter(); });
  function saveFilter() { save('sessionStorage', 'pu-filter', JSON.stringify(filter)); }

  if (search) {
    search.addEventListener('input', function () { filter.q = search.value; saveFilter(); applyFilter(); });
  }

  // Live box: counts any event on the stream, including the server's ping.
  var live = document.getElementById('live');
  var liveAge = document.getElementById('live-age');
  var lastEvent = null;
  var down = false;
  var wired = typeof WeakSet === 'function' ? new WeakSet() : null;
  function touch() { lastEvent = Date.now(); }
  document.addEventListener('htmx:sseOpen', function (e) {
    var source = e.detail && e.detail.source;
    touch();
    down = false;
    if (source && wired && !wired.has(source)) {
      wired.add(source);
      ['ping', 'services', 'agents', 'jobs'].forEach(function (name) { source.addEventListener(name, touch); });
    }
  });
  document.addEventListener('htmx:sseError', function () { down = true; });
  function renderLive() {
    if (!live || !liveAge) return;
    live.classList.toggle('down', down);
    if (down) { liveAge.textContent = 'Reconnecting…'; return; }
    if (lastEvent === null) { liveAge.textContent = 'connecting…'; return; }
    var s = Math.max(0, Math.round((Date.now() - lastEvent) / 1000));
    liveAge.textContent = 'last event ' + (s < 60 ? s + ' s ago' : Math.floor(s / 60) + ' min ago');
  }

  // Times: the server writes <time datetime="..."> with its own clock as
  // fallback text; show them in the browser's time zone.
  var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
  function pad(n) { return (n < 10 ? '0' : '') + n; }
  function localiseTimes() {
    each('time[datetime]', function (t) {
      var d = new Date(t.getAttribute('datetime'));
      if (isNaN(d.getTime())) return;
      var text;
      if (t.hasAttribute('data-rel')) {
        var min = Math.floor((Date.now() - d.getTime()) / 60000);
        text = min < 1 ? 'just now' : min < 60 ? min + ' min ago' : min < 1440 ? Math.floor(min / 60) + ' h ago' : Math.floor(min / 1440) + ' d ago';
        t.title = d.toLocaleString();
      } else {
        var clock = pad(d.getHours()) + ':' + pad(d.getMinutes());
        text = d.toDateString() === new Date().toDateString() ? clock : months[d.getMonth()] + ' ' + d.getDate() + ' ' + clock;
      }
      if (t.textContent !== text) t.textContent = text;
    });
  }

  // Copy buttons: data-copy holds the text, data-copy-target the id of the element to copy.
  function flash(button, text) {
    if (!button.dataset.label) button.dataset.label = button.textContent;
    button.textContent = text;
    setTimeout(function () { button.textContent = button.dataset.label; }, 2000);
  }
  function copyFallback(button, text) {
    var target = button.dataset.copyTarget ? document.getElementById(button.dataset.copyTarget) : null;
    if (target) {
      var range = document.createRange();
      range.selectNodeContents(target);
      var selection = window.getSelection();
      selection.removeAllRanges();
      selection.addRange(range);
      flash(button, 'Press Ctrl+C');
      return;
    }
    var area = document.createElement('textarea');
    area.value = text;
    area.setAttribute('readonly', '');
    area.style.position = 'fixed';
    area.style.opacity = '0';
    document.body.appendChild(area);
    area.select();
    var ok = false;
    try { ok = document.execCommand('copy'); } catch (e) { /* not allowed */ }
    document.body.removeChild(area);
    flash(button, ok ? 'Copied' : 'Copy failed');
  }

  // Revoke popovers are <details>. A swap of the agent list would close them, so reopen those that were open.
  var openRevokes = [];

  document.addEventListener('click', function (e) {
    var display = e.target.closest('[data-display]');
    if (display) {
      setDisplay(display.dataset.display);
      save('localStorage', 'pu-display', display.dataset.display);
      return;
    }
    var machine = e.target.closest('#machines a');
    if (machine) {
      e.preventDefault();
      filter.machine = filter.machine === machine.dataset.machine ? '' : machine.dataset.machine;
      saveFilter();
      applyFilter();
      return;
    }
    var close = e.target.closest('[data-close]');
    if (close) {
      var details = close.closest('details');
      if (details) details.open = false;
      return;
    }
    var copy = e.target.closest('[data-copy], [data-copy-target]');
    if (copy) {
      var text = copy.dataset.copy;
      if (text === undefined) {
        var el = document.getElementById(copy.dataset.copyTarget);
        text = el ? el.textContent : '';
      }
      if (navigator.clipboard && navigator.clipboard.writeText) {
        navigator.clipboard.writeText(text).then(function () { flash(copy, 'Copied'); }, function () { copyFallback(copy, text); });
      } else {
        copyFallback(copy, text);
      }
    }
  });
  document.addEventListener('keydown', function (e) {
    if (e.key === 'Escape') each('details.rv[open]', function (d) { d.open = false; });
  });
  document.addEventListener('htmx:beforeSwap', function () {
    openRevokes = [];
    each('details.rv[open]', function (d) { openRevokes.push(d.dataset.id); });
  });
  document.addEventListener('htmx:afterSwap', function () {
    each('details.rv', function (d) { if (openRevokes.indexOf(d.dataset.id) !== -1) d.open = true; });
  });
  document.addEventListener('htmx:afterSettle', function () { applyFilter(); localiseTimes(); });

  applyFilter();
  localiseTimes();
  renderLive();
  setInterval(renderLive, 1000);
  setInterval(localiseTimes, 15000);
})();