const $ = (s) => document.querySelector(s);
let config = { supportedHint: '', maxUploadMb: 500, mailAvailable: false };
let me = null;

function toast(msg) {
  const t = $('#toast');
  t.textContent = msg; t.classList.add('show');
  clearTimeout(toast._t); toast._t = setTimeout(() => t.classList.remove('show'), 2200);
}
async function api(path, opts = {}) {
  const res = await fetch(path, opts);
  if (res.status === 401) { location.href = '/login'; throw new Error('Not signed in'); }
  const data = await res.json().catch(() => ({}));
  if (!res.ok) throw new Error(data.error || `Request failed (${res.status})`);
  return data;
}
function escapeHtml(s) {
  return String(s).replace(/[&<>"']/g, (c) =>
    ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[c]));
}

// --- session guard + user menu --------------------------------------------
async function boot() {
  me = await api('/api/me');
  if (!me.authed) { location.href = '/login'; return; }
  try { config = await api('/config.json'); } catch {}
  $('#usermenu .who').innerHTML =
    `Signed in as <b>${escapeHtml(me.user.username)}</b> <span class="role-badge ${me.user.role}">${me.user.role}</span>`;
  if (me.user.role === 'admin') $('#manageBtn').style.display = '';
  $('#dropSub').textContent = `or click to browse — ${config.supportedHint}`;
  hostWarning();
  load();
}

$('#logoutBtn').addEventListener('click', async () => {
  await fetch('/api/logout', { method: 'POST' });
  location.href = '/login';
});

function hostWarning() {
  const h = location.hostname;
  if (h === 'localhost' || h === '127.0.0.1' || h === '0.0.0.0') {
    $('#hostWarn').innerHTML =
      '<span class="warn">Heads up:</span> you\'re on localhost, so QR codes will point at this machine only. ' +
      'Open the app via this computer\'s LAN address (or set PUBLIC_BASE_URL) so phones can reach it.';
  }
}

// --- upload ----------------------------------------------------------------
const drop = $('#drop');
const fileInput = $('#file');
drop.addEventListener('click', () => fileInput.click());
['dragenter', 'dragover'].forEach((ev) =>
  drop.addEventListener(ev, (e) => { e.preventDefault(); drop.classList.add('drag'); }));
['dragleave', 'drop'].forEach((ev) =>
  drop.addEventListener(ev, (e) => { e.preventDefault(); drop.classList.remove('drag'); }));
drop.addEventListener('drop', (e) => { if (e.dataTransfer.files[0]) startUpload(e.dataTransfer.files[0]); });
fileInput.addEventListener('change', () => { if (fileInput.files[0]) startUpload(fileInput.files[0]); });

function startUpload(file) {
  const maxBytes = config.maxUploadMb * 1024 * 1024;
  if (file.size > maxBytes) { toast(`That file is over the ${config.maxUploadMb} MB limit.`); return; }
  const form = new FormData();
  form.append('file', file);
  form.append('title', $('#title').value);

  const bar = $('#progress');
  const fill = bar.querySelector('i');
  bar.style.display = 'block'; fill.style.width = '0%';
  $('#uploadNote').textContent = `Uploading ${file.name}…`;

  const xhr = new XMLHttpRequest();
  xhr.open('POST', '/api/sessions');
  xhr.upload.onprogress = (e) => { if (e.lengthComputable) fill.style.width = `${Math.round((e.loaded / e.total) * 100)}%`; };
  xhr.onload = async () => {
    bar.style.display = 'none';
    if (xhr.status === 401) { location.href = '/login'; return; }
    let data = {}; try { data = JSON.parse(xhr.responseText); } catch {}
    if (xhr.status >= 400) { $('#uploadNote').textContent = data.error || 'Upload failed.'; return; }
    $('#uploadNote').textContent = 'Converting… this can take a moment for large files.';
    $('#title').value = '';
    await pollUntilReady(data.id);
    load();
  };
  xhr.onerror = () => { bar.style.display = 'none'; $('#uploadNote').textContent = 'Upload failed.'; };
  xhr.send(form);
}

async function pollUntilReady(id) {
  for (let i = 0; i < 240; i++) {
    try {
      const m = await api(`/api/sessions/${id}`);
      if (m.status === 'ready') { $('#uploadNote').textContent = 'Ready.'; return; }
      if (m.status === 'error') { $('#uploadNote').textContent = `Conversion failed: ${m.error}`; return; }
    } catch {}
    load();
    await new Promise((r) => setTimeout(r, 1500));
  }
}

// --- session list ----------------------------------------------------------
$('#refresh').addEventListener('click', async () => {
  // Rotate every presentation's QR code so links from finished sessions stop working.
  try { await api('/api/sessions/rotate-codes', { method: 'POST' }); toast('New QR codes generated'); }
  catch {}
  load();
});

async function load() {
  let items;
  try { items = await api('/api/sessions'); } catch { return; }
  const list = $('#list');
  if (!items.length) {
    list.innerHTML = '<div class="empty">No presentations yet. Upload a file above to get your first QR code.</div>';
    return;
  }
  const grid = document.createElement('div');
  grid.className = 'grid';
  for (const s of items) grid.appendChild(tile(s));
  list.replaceChildren(grid);
}

function tile(s) {
  const el = document.createElement('div');
  el.className = 'card tile';
  const when = new Date(s.createdAt).toLocaleString();
  const presentUrl = `/present/${s.id}?token=${encodeURIComponent(s.presenterToken)}`;
  const displayUrl = `/display/${s.id}?token=${encodeURIComponent(s.presenterToken)}&k=${encodeURIComponent(s.accessToken || '')}`;
  const viewUrl = `${location.origin}/view/${s.id}`;
  const owner = (me.user.role === 'admin' && s.ownerName) ? ` · ${escapeHtml(s.ownerName)}` : '';

  el.innerHTML = `
    <div class="qr"><img alt="QR code" src="/api/sessions/${s.id}/qr.svg?v=${encodeURIComponent(s.accessToken || '')}" /></div>
    <div class="meta">
      <div class="title" title="${escapeHtml(s.title)}">${escapeHtml(s.title)}</div>
      <div class="row" style="margin:6px 0 0;">
        <span class="tag ${s.status}"><span class="dot"></span>${s.status}</span>
        <span class="tag"><span class="dot"></span>${s.kind || '…'}</span>
        ${s.viewers ? `<span class="tag"><span class="dot"></span>${s.viewers} watching</span>` : ''}
      </div>
      <div class="note" style="margin-top:6px;">${when}${owner}</div>
      ${s.status === 'error' ? `<div class="note" style="color:var(--danger)">${escapeHtml(s.error || '')}</div>` : ''}
      <div class="row">
        <a class="btn primary small" href="${presentUrl}" target="_blank" rel="noopener" ${s.status !== 'ready' ? 'aria-disabled="true" style="pointer-events:none;opacity:.45"' : ''}>Present</a>
        ${s.status === 'ready' ? `<a class="btn small" href="${presentUrl}" target="_blank" rel="noopener" data-display="${displayUrl}">Present Local Only</a>` : ''}
        ${s.status === 'ready' ? `<a class="btn ghost small" href="/qr/${s.id}" target="_blank" rel="noopener">QR Code</a>` : ''}
        ${config.mailAvailable ? `<button class="btn ghost small" data-email="${s.id}" data-title="${escapeHtml(s.title)}">Email</button>` : ''}
        <button class="btn ghost small" data-copy="${viewUrl}">Copy link</button>
        <a class="btn ghost small" href="/view/${s.id}" target="_blank" rel="noopener">Open viewer</a>
        <button class="btn danger small" data-del="${s.id}">Delete</button>
      </div>
    </div>`;

  el.querySelector('[data-copy]').addEventListener('click', (e) =>
    navigator.clipboard.writeText(e.target.dataset.copy).then(() => toast('Audience link copied')));
  const emailBtn = el.querySelector('[data-email]');
  if (emailBtn) emailBtn.addEventListener('click', (e) => openEmail(e.target.dataset.email, e.target.dataset.title));
  const localBtn = el.querySelector('[data-display]');
  if (localBtn) localBtn.addEventListener('click', (e) => {
    // The anchor itself opens the presenter console (tab 1). Open the clean,
    // controls-free display as a second browser tab (no features string, so it's
    // a tab — not a popup window — and isn't blocked like the old version).
    const w = window.open(e.currentTarget.dataset.display, '_blank');
    if (w) w.opener = null; else toast('Allow pop-ups to open the display tab');
  });
  el.querySelector('[data-del]').addEventListener('click', async (e) => {
    if (!confirm('Delete this presentation for everyone?')) return;
    await api(`/api/sessions/${e.target.dataset.del}`, { method: 'DELETE' });
    load();
  });
  return el;
}

// --- email share modal -----------------------------------------------------
let emailSessionId = null;
function openEmail(id, title) {
  emailSessionId = id;
  $('#emailTitle').textContent = `Send "${title}"`;
  $('#emailTo').value = ''; $('#emailMsg').value = ''; $('#emailErr').textContent = '';
  $('#emailOverlay').classList.add('show');
  $('#emailTo').focus();
}
function closeEmail() { $('#emailOverlay').classList.remove('show'); }
$('#emailCancel').addEventListener('click', closeEmail);
$('#emailOverlay').addEventListener('click', (e) => { if (e.target.id === 'emailOverlay') closeEmail(); });
$('#emailSend').addEventListener('click', async () => {
  $('#emailErr').textContent = '';
  $('#emailSend').disabled = true;
  try {
    const r = await api(`/api/sessions/${emailSessionId}/email`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ to: $('#emailTo').value, message: $('#emailMsg').value })
    });
    closeEmail();
    toast(`Sent to ${r.sentTo.join(', ')}`);
  } catch (e) {
    $('#emailErr').textContent = e.message;
  } finally {
    $('#emailSend').disabled = false;
  }
});

boot();