{# Fill-in help of the Checkmk Settings: version, edition and filename of
   the installation file from the versions checkmk.com offers
   (download.checkmk.com/stable_downloads.json, loaded by the server,
   through the download proxy of the saved settings). Only on click: the
   Syncer often has no internet access, the examples work without it.

   The filename keeps {{CMK_VERSION}} in place of the version, so it fits
   again when only the version is changed later. Checkmk 2.5 renamed the
   editions; picking a version switches the edition to the name of that
   version's generation. #}
<style>
  .cmk-dl-help {
    margin: 4px 0 12px;
    padding: 10px 12px;
    border: 1px solid var(--surface-border, #cbd5e1);
    border-radius: 6px;
    background: var(--surface-subtle, #f8fafc);
    color: var(--surface-text, inherit);
  }
  .cmk-dl-help .cmk-dl-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    margin-top: 8px;
  }
  .cmk-dl-help select {
    max-width: 100%;
  }
  .cmk-dl-help .cmk-dl-note {
    color: var(--surface-muted, #64748b);
    font-size: 0.9em;
  }
</style>
<script>
(function() {
  var filename = document.getElementById('cmk_version_filename');
  var version = document.getElementById('cmk_version');
  var edition = document.getElementById('cmk_edition');
  if (!filename || !version || !edition) return;
  var catalogUrl = "{{ get_url('.download_catalog', id=request.args.get('id')) }}";

  // Edition of the settings (omd suffix) <-> name in the catalog
  var toCatalog = {cee: 'pro', cre: 'community', cce: 'ultimate', cme: 'ultimatemt'};
  var toOld = {pro: 'cee', community: 'cre', ultimate: 'cce', ultimatemt: 'cme'};
  var platformNames = {
    resolute: 'Ubuntu 26.04', noble: 'Ubuntu 24.04', jammy: 'Ubuntu 22.04',
    focal: 'Ubuntu 20.04', trixie: 'Debian 13', bookworm: 'Debian 12',
    bullseye: 'Debian 11', buster: 'Debian 10', el10: 'RHEL 10 and compatible',
    el9: 'RHEL 9 and compatible', el8: 'RHEL 8 and compatible',
    el7: 'RHEL 7 and compatible'
  };
  function platformName(key) {
    if (platformNames[key]) return platformNames[key];
    if (key.indexOf('cma-') === 0) return 'Checkmk Appliance (' + key + ')';
    var sles = /^sles(\d+)(?:sp(\d+)|\.(\d+))?$/.exec(key);
    if (sles) return 'SLES ' + sles[1] + (sles[2] ? ' SP' + sles[2] : (sles[3] ? '.' + sles[3] : ''));
    return key;
  }
  function isNewGeneration(major) {
    var parts = major.split('.').map(Number);
    return parts[0] > 2 || (parts[0] === 2 && parts[1] >= 5);
  }

  var group = filename.closest('.form-group') || filename.parentNode;
  var box = document.createElement('div');
  box.className = 'cmk-dl-help';
  box.innerHTML =
    '<button type="button" class="btn btn-sm btn-secondary cmk-dl-load">' +
    '<i class="fa fa-download"></i> Fill in from checkmk.com</button> ' +
    '<span class="cmk-dl-note">Version, edition and filename of the installation file. ' +
    'Only on click, the Syncer needs internet access (or the download proxy) for it.</span>' +
    '<div class="cmk-dl-note" style="margin-top:6px">Filename examples: ' +
    '<code>check-mk-pro-{' + '{CMK_VERSION}}_0.noble_amd64.deb</code>, ' +
    '<code>check-mk-pro-{' + '{CMK_VERSION}}-el9-38.x86_64.rpm</code>, ' +
    '<code>check-mk-enterprise-{' + '{CMK_VERSION}}_0.bookworm_amd64.deb</code> (up to 2.4). ' +
    'Version without edition, e.g. <code>2.4.0p12</code>.</div>' +
    '<div class="cmk-dl-row" hidden>' +
    '<select class="form-control form-control-sm cmk-dl-version" style="width:auto"></select>' +
    '<select class="form-control form-control-sm cmk-dl-platform" style="width:auto"></select>' +
    '<button type="button" class="btn btn-sm btn-primary cmk-dl-apply">Apply</button>' +
    '</div>' +
    '<div class="cmk-dl-note cmk-dl-status"></div>';
  group.parentNode.insertBefore(box, group.nextSibling);

  var row = box.querySelector('.cmk-dl-row');
  var versionSelect = box.querySelector('.cmk-dl-version');
  var platformSelect = box.querySelector('.cmk-dl-platform');
  var status = box.querySelector('.cmk-dl-status');
  var majors = [];

  function catalogEdition() {
    return toCatalog[edition.value] || edition.value || 'pro';
  }
  function chosenMajor() {
    return majors[parseInt(versionSelect.value, 10)];
  }
  function fillPlatforms() {
    var major = chosenMajor();
    var files = major && major.editions[catalogEdition()];
    var previous = platformSelect.value;
    platformSelect.innerHTML = '';
    if (!files) {
      status.textContent = 'No installation files of this edition for ' +
        (major ? major.major : 'this version') + '.';
      return;
    }
    status.textContent = '';
    Object.keys(files).sort(function(a, b) {
      return platformName(a).localeCompare(platformName(b));
    }).forEach(function(key) {
      var option = document.createElement('option');
      option.value = key;
      option.textContent = platformName(key);
      platformSelect.appendChild(option);
    });
    if (files[previous]) platformSelect.value = previous;
  }

  box.querySelector('.cmk-dl-load').addEventListener('click', function() {
    status.textContent = 'Loading versions from checkmk.com …';
    fetch(catalogUrl, {credentials: 'same-origin'})
      .then(function(response) { return response.json(); })
      .then(function(data) {
        if (data.error) { status.textContent = data.error; return; }
        majors = data.majors || [];
        versionSelect.innerHTML = '';
        majors.forEach(function(major, idx) {
          var option = document.createElement('option');
          option.value = idx;
          option.textContent = major.version + (major['class'] ? ' (' + major['class'] + ')' : '');
          versionSelect.appendChild(option);
        });
        row.hidden = false;
        fillPlatforms();
      })
      .catch(function(exp) { status.textContent = 'Could not load the versions: ' + exp; });
  });
  versionSelect.addEventListener('change', fillPlatforms);
  edition.addEventListener('change', function() { if (majors.length) fillPlatforms(); });

  box.querySelector('.cmk-dl-apply').addEventListener('click', function() {
    var major = chosenMajor();
    var files = major && major.editions[catalogEdition()];
    if (!files || !files[platformSelect.value]) return;
    var name = catalogEdition();
    var target = isNewGeneration(major.major) ? name : (toOld[name] || name);
    if (edition.value !== target) {
      edition.value = target;
      edition.dispatchEvent(new Event('change'));
    }
    version.value = major.version;
    filename.value = files[platformSelect.value];
    status.textContent = 'Filled in. The filename keeps {' + '{CMK_VERSION}' +
      '}, so it stays valid when only the version is changed.';
  });
})();
</script>