/* global api */

const loadingEl = document.getElementById('loadingState');
const listEl    = document.getElementById('vmList');
const emptyEl   = document.getElementById('emptyState');
const errorEl   = document.getElementById('error');
const noticeEl  = document.getElementById('notice');
const refreshBtn = document.getElementById('refreshBtn');
const settingsBtn = document.getElementById('settingsBtn');
const settingsOverlay = document.getElementById('settingsOverlay');
const viewerPathDisplay = document.getElementById('viewerPathDisplay');

document.getElementById('logoutBtn').addEventListener('click', async () => {
  await api.proxmox.logout();
});

refreshBtn.addEventListener('click', () => loadVMs());

// ── Settings (Windows only — VirtViewer's install folder name carries the
//    version number, so auto-detection can miss non-standard installs) ──

initSettings();

async function initSettings() {
  const platform = await api.settings.platform();
  if (platform !== 'win32') return;

  settingsBtn.classList.remove('hidden');
  settingsBtn.addEventListener('click', openSettings);
  document.getElementById('closeSettingsBtn').addEventListener('click', closeSettings);
  document.getElementById('browseViewerBtn').addEventListener('click', async () => {
    const chosen = await api.settings.browseViewerPath();
    if (chosen) await refreshViewerPathDisplay();
  });
  document.getElementById('resetViewerBtn').addEventListener('click', async () => {
    await api.settings.clearViewerPath();
    await refreshViewerPathDisplay();
  });
}

async function openSettings() {
  await refreshViewerPathDisplay();
  settingsOverlay.classList.remove('hidden');
}

function closeSettings() {
  settingsOverlay.classList.add('hidden');
}

async function refreshViewerPathDisplay() {
  const viewerPath = await api.settings.getViewerPath();
  viewerPathDisplay.textContent = viewerPath || 'automatisch erkannt';
}

// ── Load on mount ─────────────────────────────────────────

async function loadVMs() {
  clearMessages();
  listEl.classList.add('hidden');
  emptyEl.classList.add('hidden');
  loadingEl.classList.remove('hidden');

  const result = await api.proxmox.getVMs();

  loadingEl.classList.add('hidden');

  if (!result.success) {
    showError(result.error || 'Fehler beim Laden der VMs.');
    return;
  }

  const vms = result.vms;

  if (vms.length === 0) {
    emptyEl.classList.remove('hidden');
    return;
  }

  // Auto-connect when there is exactly one SPICE VM
  if (vms.length === 1) {
    showNotice(`Nur eine VM verfügbar — verbinde mit „${vms[0].name}" …`);
    await connectVM(vms[0]);
    return;
  }

  renderList(vms);
}

loadVMs();

// ── Render ────────────────────────────────────────────────

function renderList(vms) {
  // Only show the host when there's more than one — single-host setups don't need the noise.
  const multiHost = new Set(vms.map((vm) => vm.host)).size > 1;

  listEl.innerHTML = vms
    .map(
      (vm) => `
      <div class="vm-card" data-vmid="${vm.vmid}">
        <div class="vm-info">
          <div class="vm-name">${esc(vm.name)}</div>
          <div class="vm-meta">
            <span class="status-dot"></span>
            Läuft &nbsp;·&nbsp; ${multiHost ? `Host: ${esc(vm.host)} &nbsp;·&nbsp; ` : ''}Node: ${esc(vm.node)} &nbsp;·&nbsp; ID: ${vm.vmid}
          </div>
        </div>
        <button
          class="btn-connect"
          data-vmid="${vm.vmid}"
          data-host="${esc(vm.host)}"
          data-node="${esc(vm.node)}"
          data-name="${esc(vm.name)}"
        >Verbinden</button>
      </div>
    `
    )
    .join('');

  listEl.querySelectorAll('.btn-connect').forEach((btn) => {
    btn.addEventListener('click', () =>
      connectVM({
        vmid: btn.dataset.vmid,
        host: btn.dataset.host,
        node: btn.dataset.node,
        name: btn.dataset.name,
      })
    );
  });

  listEl.classList.remove('hidden');
}

// ── Connect ───────────────────────────────────────────────

async function connectVM(vm) {
  clearMessages();
  setAllButtons(true, 'Verbinde…');

  const result = await api.proxmox.connect(vm);

  setAllButtons(false, 'Verbinden');

  if (!result.success) {
    showError(result.error || 'Verbindung fehlgeschlagen.');
  } else {
    showNotice(`„${vm.name}" — SPICE-Sitzung gestartet.`);
  }
}

// ── Helpers ───────────────────────────────────────────────

function setAllButtons(disabled, label) {
  listEl.querySelectorAll('.btn-connect').forEach((b) => {
    b.disabled = disabled;
    b.textContent = label;
  });
}

function showError(msg) {
  errorEl.textContent = msg;
  errorEl.classList.remove('hidden');
}

function showNotice(msg) {
  noticeEl.textContent = msg;
  noticeEl.classList.remove('hidden');
  setTimeout(() => noticeEl.classList.add('hidden'), 5000);
}

function clearMessages() {
  errorEl.classList.add('hidden');
  noticeEl.classList.add('hidden');
}

function esc(str) {
  return String(str)
    .replace(/&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;');
}