/* One ANSI ramp per session.
 *
 * Boards rotated their welcome screens; this draws a palette instead. It is
 * held in sessionStorage so it stays put while you read and changes when you
 * come back, rather than flickering on every page load.
 *
 * Every ramp is three of the sixteen EGA indices, ordered dark to bright, and
 * none of them bottom out on the frame blue, which would dissolve the logo's
 * feet into the chrome. Without JS the CSS defaults apply and nothing is lost.
 */
(function () {
  var RAMPS = [
    ['#0000aa', '#00aaaa', '#55ffff'],   // ice
    ['#0000aa', '#00aaaa', '#ffffff'],   // ice/white
    ['#00aaaa', '#55ffff', '#ffffff'],   // shallow
    ['#555555', '#00aaaa', '#55ffff'],   // slate cyan
    ['#00aa00', '#55ff55', '#ffffff'],   // moss
    ['#555555', '#00aa00', '#55ff55'],   // slate green
    ['#00aa00', '#00aaaa', '#55ffff'],   // verdigris
    ['#aa0000', '#aa5500', '#ffff55'],   // ember
    ['#aa0000', '#ff5555', '#ffff55'],   // fire
    ['#aa5500', '#ff5555', '#ffff55'],   // rust
    ['#aa5500', '#ffff55', '#ffffff'],   // amber
    ['#555555', '#aaaaaa', '#ffffff'],   // mono
    ['#555555', '#aaaaaa', '#55ffff'],   // cold mono
    ['#aa00aa', '#ff55ff', '#ffffff'],   // violet
    ['#aa0000', '#aa00aa', '#ff55ff']    // sunset
  ];
  var i;
  try {
    i = sessionStorage.getItem('ramp');
    if (i === null) {
      i = Math.floor(Math.random() * RAMPS.length);
      sessionStorage.setItem('ramp', i);
    }
  } catch (e) {
    i = Math.floor(Math.random() * RAMPS.length);
  }
  var r = RAMPS[i % RAMPS.length];
  var s = document.documentElement.style;
  s.setProperty('--l1', r[0]);
  s.setProperty('--l2', r[1]);
  s.setProperty('--l3', r[2]);
})();

/* The prompt accepts commands.
 *
 * Numbers mean different things depending on the screen, which is how a board
 * worked: at the main menu they select an area, inside an area they select a
 * message. Nothing has to disambiguate because no two things on one screen
 * claim the same key. Anything typeable carries data-key and the chrome that
 * marks it, so the brackets are a promise rather than decoration.
 */
(function () {
  // The script sits in <head> so the ramp applies before first paint; the
  // command handler has to wait for a DOM to read its keys out of.
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init);
  } else {
    init();
  }

  function init() {
  var buf = '', timer;
  var out = document.getElementById('typed');
  if (!out) return;
  var hint = document.createElement('span');
  hint.className = 'hint';
  out.parentNode.insertBefore(hint, out.nextSibling.nextSibling);

  function keys() {
    var m = {};
    [].forEach.call(document.querySelectorAll('[data-key]'), function (a) {
      m[String(a.dataset.key).trim().toUpperCase()] = {
        href: a.getAttribute('href'),
        label: a.textContent.trim().replace(/\s+/g, ' ').slice(0, 44)
      };
    });
    return m;
  }
  var MAP = keys();

  // Echo what the number is pointing at, so a pause is informative rather than
  // just a delay: you can see it is right and wait, keep typing, or hit Enter.
  function show() {
    out.textContent = buf;
    var hit = MAP[buf];
    hint.textContent = hit ? '  ' + hit.label : '';
  }
  function go(k) {
    var hit = MAP[k];
    if (hit) { location.href = hit.href; return true; }
    return false;
  }

  addEventListener('keydown', function (e) {
    if (e.metaKey || e.ctrlKey || e.altKey) return;
    var k = e.key;

    clearTimeout(timer);
    if (k === 'Enter') {
      if (buf && !go(buf)) { out.textContent = ''; }
      buf = ''; show(); e.preventDefault(); return;
    }
    if (k === 'Backspace') { buf = buf.slice(0, -1); show(); e.preventDefault(); return; }
    if (k === 'Escape') { buf = ''; show(); e.preventDefault(); return; }

    if (/^[0-9]$/.test(k)) {
      buf += k;
      show();
      clearTimeout(timer);
      var longer = Object.keys(MAP).some(function (x) {
        return x.length > buf.length && x.indexOf(buf) === 0;
      });
      if (!longer) {
        // Nothing longer can match, so settle it now: go, or drop what was
        // typed so a mistyped number never sticks at the prompt.
        if (MAP[buf]) { go(buf); } else { buf = ''; show(); }
      } else if (MAP[buf]) {
        // Ambiguous: "1" is an area and "12" is an entry further down the same
        // screen. Terminal menus settled this on a short pause rather than
        // making every selection need Enter, so this does too.
        // 1200ms, because the message index runs past 40 and reaching for a
        // second digit takes longer than a confirmation would. Enter commits
        // at once for anyone who does not want to wait.
        timer = setTimeout(function () { go(buf); }, 1200);
      }
      e.preventDefault();
      return;
    }
    if (/^[a-zA-Z]$/.test(k)) {
      if (go(k.toUpperCase())) e.preventDefault();
    }
  });
  }
})();

/* The address is stored rot13 so it is not sitting in the HTML for a scraper to
 * lift. Same trick as tobias.raayoni-last.com. Without JS the fallback text
 * still reads, spelled out, so nothing is lost but the click.
 */
(function () {
  function rot13(s) {
    return s.replace(/[a-zA-Z]/g, function (c) {
      return String.fromCharCode((c <= 'Z' ? 90 : 122) >= (c = c.charCodeAt(0) + 13) ? c : c - 26);
    });
  }
  function init() {
    [].forEach.call(document.querySelectorAll('.mail[data-r]'), function (el) {
      var a = document.createElement('a');
      a.href = 'mailto:' + rot13(el.dataset.r);
      a.textContent = rot13(el.dataset.r);
      el.replaceWith(a);
    });
  }
  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', init);
  else init();
})();