// GoWebMail app.js — full client

// ── State ──────────────────────────────────────────────────────────────────
const S = {
  me: null, accounts: [], providers: {gmail:false,outlook:false},
  folders: [], messages: [], totalMessages: 0,
  currentPage: 1, currentFolder: 'unified', currentFolderName: 'Unified Inbox',
  currentMessage: null, selectedMessageId: null,
  searchQuery: '', composeMode: 'new', composeReplyToId: null, composeForwardFromId: null,
  filterUnread: false, filterAttachment: false,
  sortOrder: 'date-desc', // 'date-desc' | 'date-asc' | 'size-desc'
};

// ── Boot ───────────────────────────────────────────────────────────────────
async function init() {
  const [me, providers, wl] = await Promise.all([
    api('GET','/me'), api('GET','/providers'), api('GET','/remote-content-whitelist'),
  ]);
  if (me) {
    S.me = me;
    document.getElementById('user-display').textContent = me.username || me.email;
    if (me.role === 'admin') document.getElementById('admin-link').style.display = 'block';
  }
  if (providers) { S.providers = providers; updateProviderButtons(); }
  if (wl?.whitelist) S.remoteWhitelist = new Set(wl.whitelist);

  await loadAccounts();
  await loadFolders();
  await loadMessages();
  // Seed poller ID so we don't notify on initial load
  if (S.messages.length > 0) {
    POLLER.lastKnownID = Math.max(...S.messages.map(m=>m.id));
  }

  const p = new URLSearchParams(location.search);
  if (p.get('connected')) { toast('Account connected!', 'success'); history.replaceState({},'','/'); }
  if (p.get('error'))     { toast('Connection failed: '+p.get('error'), 'error'); history.replaceState({},'','/'); }

  document.addEventListener('keydown', e => {
    if (['INPUT','TEXTAREA','SELECT'].includes(e.target.tagName)) return;
    if (e.target.contentEditable === 'true') return;
    if ((e.metaKey||e.ctrlKey) && e.key==='n') { e.preventDefault(); openCompose(); }
    if ((e.metaKey||e.ctrlKey) && e.key==='k') { e.preventDefault(); document.getElementById('search-input').focus(); }
  });

  initComposeDragResize();
  startPoller();
}

// ── Providers ──────────────────────────────────────────────────────────────
function updateProviderButtons() {
  ['gmail','outlook'].forEach(p => {
    const btn = document.getElementById('btn-'+p);
    if (!btn) return;
    if (!S.providers[p]) { btn.disabled=true; btn.classList.add('unavailable'); btn.title='Not configured'; }
  });
}

// ── Accounts popup ─────────────────────────────────────────────────────────
function toggleAccountsMenu(e) {
  e.stopPropagation();
  const popup = document.getElementById('accounts-popup');
  const backdrop = document.getElementById('accounts-popup-backdrop');
  if (popup.classList.contains('open')) {
    closeAccountsMenu(); return;
  }
  renderAccountsPopup();
  popup.classList.add('open');
  backdrop.classList.add('open');
}
function closeAccountsMenu() {
  document.getElementById('accounts-popup').classList.remove('open');
  document.getElementById('accounts-popup-backdrop').classList.remove('open');
}

function renderAccountsPopup() {
  const el = document.getElementById('accounts-popup-list');
  if (!S.accounts.length) {
    el.innerHTML = '<div style="font-size:12px;color:var(--muted);padding:8px 0">No accounts connected.</div>';
    return;
  }
  el.innerHTML = S.accounts.map(a => `
    <div class="acct-popup-item" title="${esc(a.email_address)}${a.last_error?' ⚠ '+esc(a.last_error):''}">
      <div style="display:flex;align-items:center;gap:8px;flex:1;min-width:0">
        <span class="account-dot" style="background:${a.color};flex-shrink:0"></span>
        <span style="font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap">${esc(a.display_name||a.email_address)}</span>
        ${a.last_error?'<span style="color:var(--danger);font-size:11px">⚠</span>':''}
      </div>
      <div style="display:flex;gap:4px;flex-shrink:0">
        <button class="icon-btn" title="Sync now" onclick="syncNow(${a.id},event)">
          <svg width="13" height="13" viewBox="0 0 24 24" fill="currentColor"><path d="M12 4V1L8 5l4 4V6c3.31 0 6 2.69 6 6 0 1.01-.25 1.97-.7 2.8l1.46 1.46C19.54 15.03 20 13.57 20 12c0-4.42-3.58-8-8-8zm0 14c-3.31 0-6-2.69-6-6 0-1.01.25-1.97.7-2.8L5.24 7.74C4.46 8.97 4 10.43 4 12c0 4.42 3.58 8 8 8v3l4-4-4-4v3z"/></svg>
        </button>
        <button class="icon-btn" title="Settings" onclick="openEditAccount(${a.id})">
          <svg width="13" height="13" viewBox="0 0 24 24" fill="currentColor"><path d="M3 17.25V21h3.75L17.81 9.94l-3.75-3.75L3 17.25zM20.71 7.04c.39-.39.39-1.02 0-1.41l-2.34-2.34c-.39-.39-1.02-.39-1.41 0l-1.83 1.83 3.75 3.75 1.83-1.83z"/></svg>
        </button>
        <button class="icon-btn" title="Remove" onclick="deleteAccount(${a.id})" style="color:var(--danger)">
          <svg width="13" height="13" viewBox="0 0 24 24" fill="currentColor"><path d="M6 19c0 1.1.9 2 2 2h8c1.1 0 2-.9 2-2V7H6v12zM19 4h-3.5l-1-1h-5l-1 1H5v2h14V4z"/></svg>
        </button>
      </div>
    </div>`).join('');
}

// ── Accounts ───────────────────────────────────────────────────────────────
async function loadAccounts() {
  const data = await api('GET','/accounts');
  if (!data) return;
  S.accounts = data;
  renderAccountsPopup();
  populateComposeFrom();
}

function connectOAuth(p) { location.href='/auth/'+p+'/connect'; }

function openAddAccountModal() {
  ['imap-email','imap-name','imap-password','imap-host','smtp-host'].forEach(id=>{ const el=document.getElementById(id); if(el) el.value=''; });
  document.getElementById('imap-port').value='993';
  document.getElementById('smtp-port').value='587';
  const r=document.getElementById('test-result'); if(r){r.style.display='none';r.className='test-result';}
  closeAccountsMenu();
  openModal('add-account-modal');
}

async function testNewConnection() {
  const btn=document.getElementById('test-btn'), result=document.getElementById('test-result');
  const body={email:document.getElementById('imap-email').value.trim(),password:document.getElementById('imap-password').value,
    imap_host:document.getElementById('imap-host').value.trim(),imap_port:parseInt(document.getElementById('imap-port').value)||993,
    smtp_host:document.getElementById('smtp-host').value.trim(),smtp_port:parseInt(document.getElementById('smtp-port').value)||587};
  if (!body.email||!body.password||!body.imap_host){result.textContent='Email, password and IMAP host required.';result.className='test-result err';result.style.display='block';return;}
  btn.innerHTML='<span class="spinner-inline"></span>Testing...';btn.disabled=true;
  const r=await api('POST','/accounts/test',body);
  btn.textContent='Test Connection';btn.disabled=false;
  result.textContent=(r?.ok)?'✓ Connection successful!':((r?.error)||'Connection failed');
  result.className='test-result '+((r?.ok)?'ok':'err'); result.style.display='block';
}

async function addIMAPAccount() {
  const btn=document.getElementById('save-acct-btn');
  const body={email:document.getElementById('imap-email').value.trim(),display_name:document.getElementById('imap-name').value.trim(),
    password:document.getElementById('imap-password').value,imap_host:document.getElementById('imap-host').value.trim(),
    imap_port:parseInt(document.getElementById('imap-port').value)||993,smtp_host:document.getElementById('smtp-host').value.trim(),
    smtp_port:parseInt(document.getElementById('smtp-port').value)||587};
  if (!body.email||!body.password||!body.imap_host){toast('Email, password and IMAP host required','error');return;}
  btn.disabled=true;btn.textContent='Connecting...';
  const r=await api('POST','/accounts',body);
  btn.disabled=false;btn.textContent='Connect';
  if (r?.ok){
    toast('Account added — syncing…','success');
    closeModal('add-account-modal');
    await loadAccounts();
    // Background sync takes a moment — reload folders/messages after a short wait
    setTimeout(async ()=>{ await loadFolders(); await loadMessages(); toast('Sync complete','success'); }, 3000);
  } else toast(r?.error||'Failed to add account','error');
}

async function detectMailSettings() {
  const email=document.getElementById('imap-email').value.trim();
  if (!email||!email.includes('@')){toast('Enter your email address first','error');return;}
  const btn=document.getElementById('detect-btn');
  btn.innerHTML='<span class="spinner-inline"></span>Detecting…';btn.disabled=true;
  const r=await api('POST','/accounts/detect',{email});
  btn.textContent='Auto-detect';btn.disabled=false;
  if (!r){toast('Detection failed','error');return;}
  document.getElementById('imap-host').value=r.imap_host||'';
  document.getElementById('imap-port').value=r.imap_port||993;
  document.getElementById('smtp-host').value=r.smtp_host||'';
  document.getElementById('smtp-port').value=r.smtp_port||587;
  if(r.detected) toast(`Detected ${r.imap_host} / ${r.smtp_host}`,'success');
  else toast('No servers found — filled with defaults based on domain','info');
}

async function syncNow(id, e) {
  if (e) e.stopPropagation();
  toast('Syncing…','info');
  const r = await api('POST','/accounts/'+id+'/sync');
  if (r?.ok) { toast('Synced '+(r.synced||0)+' messages','success'); loadAccounts(); loadFolders(); loadMessages(); }
  else toast(r?.error||'Sync failed','error');
}

// ── Edit Account modal ─────────────────────────────────────────────────────
async function openEditAccount(id) {
  closeAccountsMenu();
  const r=await api('GET','/accounts/'+id);
  if (!r) return;
  document.getElementById('edit-account-id').value=id;
  document.getElementById('edit-account-email').textContent=r.email_address;
  document.getElementById('edit-name').value=r.display_name||'';
  document.getElementById('edit-password').value='';
  document.getElementById('edit-imap-host').value=r.imap_host||'';
  document.getElementById('edit-imap-port').value=r.imap_port||993;
  document.getElementById('edit-smtp-host').value=r.smtp_host||'';
  document.getElementById('edit-smtp-port').value=r.smtp_port||587;
  document.getElementById('edit-sync-days').value=r.sync_days||30;
  // Restore sync mode select: map stored days/mode back to a preset option
  const sel = document.getElementById('edit-sync-mode');
  if (r.sync_mode==='all' || !r.sync_days) {
    sel.value='all';
  } else {
    const presetMap={30:'preset-30',90:'preset-90',180:'preset-180',365:'preset-365',730:'preset-730',1825:'preset-1825'};
    sel.value = presetMap[r.sync_days] || 'days';
  }
  toggleSyncDaysField();
  const errEl=document.getElementById('edit-last-error'), connEl=document.getElementById('edit-conn-result');
  connEl.style.display='none';
  errEl.style.display=r.last_error?'block':'none';
  if (r.last_error) errEl.textContent='Last sync error: '+r.last_error;

  // Load hidden folders for this account
  const hiddenEl = document.getElementById('edit-hidden-folders');
  const hidden = S.folders.filter(f=>f.account_id===id && f.is_hidden);
  if (!hidden.length) {
    hiddenEl.innerHTML='<span style="color:var(--muted);font-size:12px">No hidden folders.</span>';
  } else {
    hiddenEl.innerHTML = hidden.map(f=>`
      <div style="display:flex;align-items:center;justify-content:space-between;padding:5px 0;border-bottom:1px solid var(--border)">
        <span style="font-size:13px">${esc(f.name)}</span>
        <button class="btn-secondary" style="font-size:11px;padding:3px 10px" onclick="unhideFolder(${f.id})">Unhide</button>
      </div>`).join('');
  }

  openModal('edit-account-modal');
}

async function unhideFolder(folderId) {
  const f = S.folders.find(f=>f.id===folderId);
  if (!f) return;
  const r = await api('PUT','/folders/'+folderId+'/visibility',{is_hidden:false, sync_enabled:true});
  if (r?.ok) {
    toast('Folder restored to sidebar','success');
    await loadFolders();
    // Refresh hidden list in modal
    const accId = parseInt(document.getElementById('edit-account-id').value);
    if (accId) {
      const hiddenEl = document.getElementById('edit-hidden-folders');
      const hidden = S.folders.filter(f=>f.account_id===accId && f.is_hidden);
      if (!hidden.length) hiddenEl.innerHTML='<span style="color:var(--muted);font-size:12px">No hidden folders.</span>';
      else hiddenEl.innerHTML = hidden.map(f=>`
        <div style="display:flex;align-items:center;justify-content:space-between;padding:5px 0;border-bottom:1px solid var(--border)">
          <span style="font-size:13px">${esc(f.name)}</span>
          <button class="btn-secondary" style="font-size:11px;padding:3px 10px" onclick="unhideFolder(${f.id})">Unhide</button>
        </div>`).join('');
    }
  } else toast('Failed to unhide folder','error');
}

function toggleSyncDaysField() {
  const mode=document.getElementById('edit-sync-mode')?.value;
  const row=document.getElementById('edit-sync-days-row');
  if (row) row.style.display=(mode==='days')?'flex':'none';
}

async function testEditConnection() {
  const btn=document.getElementById('edit-test-btn'), connEl=document.getElementById('edit-conn-result');
  const pw=document.getElementById('edit-password').value, email=document.getElementById('edit-account-email').textContent.trim();
  if (!pw){connEl.textContent='Enter new password to test.';connEl.className='test-result err';connEl.style.display='block';return;}
  btn.innerHTML='<span class="spinner-inline"></span>Testing...';btn.disabled=true;
  const r=await api('POST','/accounts/test',{email,password:pw,
    imap_host:document.getElementById('edit-imap-host').value.trim(),imap_port:parseInt(document.getElementById('edit-imap-port').value)||993,
    smtp_host:document.getElementById('edit-smtp-host').value.trim(),smtp_port:parseInt(document.getElementById('edit-smtp-port').value)||587});
  btn.textContent='Test Connection';btn.disabled=false;
  connEl.textContent=(r?.ok)?'✓ Successful!':((r?.error)||'Failed');
  connEl.className='test-result '+((r?.ok)?'ok':'err'); connEl.style.display='block';
}

async function saveAccountEdit() {
  const id=document.getElementById('edit-account-id').value;
  const body={display_name:document.getElementById('edit-name').value.trim(),
    imap_host:document.getElementById('edit-imap-host').value.trim(),imap_port:parseInt(document.getElementById('edit-imap-port').value)||993,
    smtp_host:document.getElementById('edit-smtp-host').value.trim(),smtp_port:parseInt(document.getElementById('edit-smtp-port').value)||587};
  const pw=document.getElementById('edit-password').value;
  if (pw) body.password=pw;
  const modeVal = document.getElementById('edit-sync-mode').value;
  let syncMode='all', syncDays=0;
  if (modeVal==='days') {
    syncMode='days'; syncDays=parseInt(document.getElementById('edit-sync-days').value)||30;
  } else if (modeVal.startsWith('preset-')) {
    syncMode='days'; syncDays=parseInt(modeVal.replace('preset-',''));
  } // else 'all': syncMode='all', syncDays=0
  const [r1, r2] = await Promise.all([
    api('PUT','/accounts/'+id, body),
    api('PUT','/accounts/'+id+'/sync-settings',{
      sync_mode: syncMode,
      sync_days: syncDays,
    }),
  ]);
  if (r1?.ok){toast('Account updated','success');closeModal('edit-account-modal');loadAccounts();}
  else toast(r1?.error||'Update failed','error');
}

async function deleteAccount(id) {
  const a=S.accounts.find(a=>a.id===id);
  inlineConfirm(
    'Remove '+(a?a.email_address:'this account')+'? All synced messages will be deleted.',
    async () => {
      const r=await api('DELETE','/accounts/'+id);
      if (r?.ok){toast('Account removed','success');closeAccountsMenu();loadAccounts();loadFolders();loadMessages();}
      else toast('Remove failed','error');
    }
  );
}

// ── Inline confirm (replaces browser confirm()) ────────────────────────────
function inlineConfirm(message, onOk, onCancel) {
  const el   = document.getElementById('inline-confirm');
  const msg  = document.getElementById('inline-confirm-msg');
  const ok   = document.getElementById('inline-confirm-ok');
  const cancel = document.getElementById('inline-confirm-cancel');
  msg.textContent = message;
  el.classList.add('open');
  const cleanup = () => { el.classList.remove('open'); ok.onclick=null; cancel.onclick=null; };
  ok.onclick     = () => { cleanup(); onOk && onOk(); };
  cancel.onclick = () => { cleanup(); onCancel && onCancel(); };
}

// ── Folders ────────────────────────────────────────────────────────────────
async function loadFolders() {
  const data=await api('GET','/folders');
  if (!data) return;
  S.folders=data||[];
  renderFolders();
  updateUnreadBadge();
}

const FOLDER_ICONS = {
  inbox:'<path d="M20 4H4c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V6c0-1.1-.9-2-2-2zm0 4l-8 5-8-5V6l8 5 8-5v2z"/>',
  sent:'<path d="M2.01 21L23 12 2.01 3 2 10l15 2-15 2z"/>',
  drafts:'<path d="M3 17.25V21h3.75L17.81 9.94l-3.75-3.75L3 17.25zM20.71 7.04c.39-.39.39-1.02 0-1.41l-2.34-2.34c-.39-.39-1.02-.39-1.41 0l-1.83 1.83 3.75 3.75 1.83-1.83z"/>',
  trash:'<path d="M6 19c0 1.1.9 2 2 2h8c1.1 0 2-.9 2-2V7H6v12zM19 4h-3.5l-1-1h-5l-1 1H5v2h14V4z"/>',
  spam:'<path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm1 15h-2v-2h2v2zm0-4h-2V7h2v6z"/>',
  archive:'<path d="M20.54 5.23l-1.39-1.68C18.88 3.21 18.47 3 18 3H6c-.47 0-.88.21-1.16.55L3.46 5.23C3.17 5.57 3 6.02 3 6.5V19c0 1.1.9 2 2 2h14c1.1 0 2-.9 2-2V6.5c0-.48-.17-.93-.46-1.27zM12 17.5L6.5 12H10v-2h4v2h3.5L12 17.5zM5.12 5l.81-1h12l.94 1H5.12z"/>',
  custom:'<path d="M20 6h-2.18c.07-.44.18-.86.18-1 0-2.21-1.79-4-4-4s-4 1.79-4 4c0 .14.11.56.18 1H8c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h12c1.1 0 2-.9 2-2V8c0-1.1-.9-2-2-2z"/>',
};

function renderFolders() {
  const el=document.getElementById('folders-by-account');
  const accMap={}; S.accounts.forEach(a=>accMap[a.id]=a);
  const byAcc={};
  S.folders.filter(f=>!f.is_hidden).forEach(f=>{(byAcc[f.account_id]=byAcc[f.account_id]||[]).push(f);});
  const prio=['inbox','sent','drafts','trash','spam','archive'];
  el.innerHTML=Object.entries(byAcc).map(([accId,folders])=>{
    const acc=accMap[parseInt(accId)];
    const accColor = acc?.color || '#888';
    const accEmail = acc?.email_address || 'Account '+accId;
    if(!folders?.length) return '';
    const sorted=[...prio.map(t=>folders.find(f=>f.folder_type===t)).filter(Boolean),...folders.filter(f=>f.folder_type==='custom')];
    return `<div class="nav-folder-header">
        <span style="width:6px;height:6px;border-radius:50%;background:${accColor};display:inline-block;flex-shrink:0"></span>
        <span style="flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap">${esc(accEmail)}</span>
        <button class="icon-sync-btn" title="Sync account" onclick="syncNow(${parseInt(accId)},event)" style="margin-left:4px">
          <svg width="11" height="11" viewBox="0 0 24 24" fill="currentColor"><path d="M12 4V1L8 5l4 4V6c3.31 0 6 2.69 6 6 0 1.01-.25 1.97-.7 2.8l1.46 1.46C19.54 15.03 20 13.57 20 12c0-4.42-3.58-8-8-8zm0 14c-3.31 0-6-2.69-6-6 0-1.01.25-1.97.7-2.8L5.24 7.74C4.46 8.97 4 10.43 4 12c0 4.42 3.58 8 8 8v3l4-4-4-4v3z"/></svg>
        </button>
      </div>`+sorted.map(f=>`
      <div class="nav-item${f.sync_enabled?'':' folder-nosync'}" id="nav-f${f.id}" data-fid="${f.id}" onclick="selectFolder(${f.id},'${esc(f.name)}')"
           oncontextmenu="showFolderMenu(event,${f.id})">
        <svg viewBox="0 0 24 24" fill="currentColor">${FOLDER_ICONS[f.folder_type]||FOLDER_ICONS.custom}</svg>
        ${esc(f.name)}
        ${f.unread_count>0?`<span class="unread-badge">${f.unread_count}</span>`:''}
        ${!f.sync_enabled?'<span style="font-size:9px;color:var(--muted);margin-left:auto" title="Sync disabled">⊘</span>':''}
      </div>`).join('');
  }).join('');
}

function showFolderMenu(e, folderId) {
  e.preventDefault(); e.stopPropagation();
  const f = S.folders.find(f=>f.id===folderId);
  if (!f) return;
  const syncLabel = f.sync_enabled ? '⊘ Disable sync' : '↻ Enable sync';
  const otherFolders = S.folders.filter(x=>x.id!==folderId&&x.account_id===f.account_id&&!x.is_hidden).slice(0,16);
  const moveItems = otherFolders.map(x=>
    `<div class="ctx-item ctx-sub-item" onclick="moveFolderContents(${folderId},${x.id});closeMenu()">${esc(x.name)}</div>`
  ).join('');
  const moveEntry = otherFolders.length ? `
    <div class="ctx-item ctx-has-sub">📂 Move messages to
      <span class="ctx-sub-arrow">›</span>
      <div class="ctx-submenu">${moveItems}</div>
    </div>` : '';
  const isTrashOrSpam = f.folder_type==='trash' || f.folder_type==='spam';
  const emptyEntry = isTrashOrSpam
    ? `<div class="ctx-item danger" onclick="confirmEmptyFolder(${folderId});closeMenu()">🗑 Empty ${f.name}</div>` : '';
  const disabledCount = S.folders.filter(x=>x.account_id===f.account_id&&!x.sync_enabled).length;
  const enableAllEntry = disabledCount > 0
    ? `<div class="ctx-item" onclick="enableAllFolderSync(${f.account_id});closeMenu()">↻ Enable sync for all folders (${disabledCount})</div>` : '';
  showCtxMenu(e, `
    <div class="ctx-item" onclick="syncFolderNow(${folderId});closeMenu()">↻ Sync this folder</div>
    <div class="ctx-item" onclick="toggleFolderSync(${folderId});closeMenu()">${syncLabel}</div>
    ${enableAllEntry}
    <div class="ctx-item" onclick="markFolderAllRead(${folderId});closeMenu()">✓ Mark all as read</div>
    <div class="ctx-sep"></div>
    ${moveEntry}
    ${emptyEntry}
    <div class="ctx-item" onclick="confirmHideFolder(${folderId});closeMenu()">👁 Hide from sidebar</div>
    <div class="ctx-item danger" onclick="confirmDeleteFolder(${folderId});closeMenu()">🗑 Delete folder</div>`);
}

async function syncFolderNow(folderId) {
  toast('Syncing folder…','info');
  const r=await api('POST','/folders/'+folderId+'/sync');
  if (r?.ok) { toast('Synced '+(r.synced||0)+' messages','success'); loadFolders(); loadMessages(); }
  else toast(r?.error||'Sync failed','error');
}

async function markFolderAllRead(folderId) {
  const r=await api('POST','/folders/'+folderId+'/mark-all-read');
  if(r?.ok){
    toast(`Marked ${r.marked||0} message(s) as read`,'success');
    loadFolders();
    loadMessages();
  } else toast(r?.error||'Failed','error');
}

async function toggleFolderSync(folderId) {
  const f = S.folders.find(f=>f.id===folderId);
  if (!f) return;
  const newSync = !f.sync_enabled;
  const r = await api('PUT','/folders/'+folderId+'/visibility',{is_hidden:f.is_hidden, sync_enabled:newSync});
  if (r?.ok) {
    f.sync_enabled = newSync;
    toast(newSync?'Folder sync enabled':'Folder sync disabled', 'success');
    renderFolders();
  } else toast('Update failed','error');
}

async function enableAllFolderSync(accountId) {
  const r = await api('POST','/accounts/'+accountId+'/enable-all-sync');
  if (r?.ok) {
    // Update local state
    S.folders.forEach(f=>{ if(f.account_id===accountId) f.sync_enabled=true; });
    toast(`Sync enabled for ${r.enabled||0} folder${r.enabled===1?'':'s'}`, 'success');
    renderFolders();
  } else toast('Failed to enable sync', 'error');
}

async function confirmEmptyFolder(folderId) {
  const f = S.folders.find(f=>f.id===folderId);
  if (!f) return;
  const label = f.folder_type==='trash' ? 'Trash' : 'Spam';
  inlineConfirm(
    `Permanently delete all messages in ${label}? This cannot be undone.`,
    async () => {
      const r = await api('POST','/folders/'+folderId+'/empty');
      if (r?.ok) {
        toast(`Emptied ${label} (${r.deleted||0} messages)`, 'success');
        // Remove locally
        S.messages = S.messages.filter(m=>m.folder_id!==folderId);
        if (S.currentMessage && S.currentFolder===folderId) resetDetail();
        await loadFolders();
        if (S.currentFolder===folderId) renderMessageList();
      } else toast('Failed to empty folder','error');
    }
  );
}

async function confirmHideFolder(folderId) {
  const f = S.folders.find(f=>f.id===folderId);
  if (!f) return;
  inlineConfirm(
    `Hide "${f.name}" from sidebar? You can unhide it from account settings.`,
    async () => {
      const r = await api('PUT','/folders/'+folderId+'/visibility',{is_hidden:true, sync_enabled:false});
      if (r?.ok) { toast('Folder hidden','success'); await loadFolders(); }
      else toast('Update failed','error');
    }
  );
}

async function confirmDeleteFolder(folderId) {
  const f = S.folders.find(f=>f.id===folderId);
  if (!f) return;
  const countRes = await api('GET','/folders/'+folderId+'/count');
  const count = countRes?.count ?? '?';
  inlineConfirm(
    `Delete folder "${f.name}"? This will permanently delete all ${count} message${count===1?'':'s'} inside it. This cannot be undone.`,
    async () => {
      const r = await api('DELETE','/folders/'+folderId);
      if (r?.ok) {
        toast('Folder deleted','success');
        S.folders = S.folders.filter(x=>x.id!==folderId);
        if (S.currentFolder===folderId) selectFolder('unified','Unified Inbox');
        renderFolders(); loadMessages();
      } else toast(r?.error||'Delete failed','error');
    }
  );
}

async function moveFolderContents(fromId, toId) {
  const from = S.folders.find(f=>f.id===fromId);
  const to   = S.folders.find(f=>f.id===toId);
  if (!from||!to) return;
  inlineConfirm(
    `Move all messages from "${from.name}" into "${to.name}"?`,
    async () => {
      const r = await api('POST','/folders/'+fromId+'/move-to/'+toId);
      if (r?.ok) { toast(`Moved ${r.moved||0} messages`,'success'); loadFolders(); loadMessages(); }
      else toast(r?.error||'Move failed','error');
    }
  );
}

function updateUnreadBadge() {
  const total=S.folders.filter(f=>f.folder_type==='inbox').reduce((s,f)=>s+(f.unread_count||0),0);
  const badge=document.getElementById('unread-total');
  badge.textContent=total; badge.style.display=total>0?'':'none';
}

// ── Messages ───────────────────────────────────────────────────────────────
function selectFolder(folderId, folderName) {
  S.currentFolder=folderId; S.currentFolderName=folderName||S.currentFolderName;
  S.currentPage=1; S.messages=[]; S.searchQuery='';
  document.getElementById('search-input').value='';
  document.getElementById('panel-title').textContent=folderName||S.currentFolderName;
  document.querySelectorAll('.nav-item').forEach(n=>n.classList.remove('active'));
  const navEl=folderId==='unified'?document.getElementById('nav-unified')
    :folderId==='starred'?document.getElementById('nav-starred')
    :document.getElementById('nav-f'+folderId);
  if (navEl) navEl.classList.add('active');
  loadMessages();
}

const handleSearch=debounce(q=>{
  S.searchQuery=q.trim(); S.currentPage=1;
  document.getElementById('panel-title').textContent=q.trim()?'Search: '+q.trim():S.currentFolderName;
  loadMessages();
},350);

async function loadMessages(append) {
  const list=document.getElementById('message-list');
  if (!append) list.innerHTML='<div class="spinner" style="margin-top:60px"></div>';
  let result;
  if (S.searchQuery) result=await api('GET',`/search?q=${encodeURIComponent(S.searchQuery)}&page=${S.currentPage}&page_size=50`);
  else if (S.currentFolder==='unified') result=await api('GET',`/messages/unified?page=${S.currentPage}&page_size=50`);
  else if (S.currentFolder==='starred') result=await api('GET',`/messages/starred?page=${S.currentPage}&page_size=50`);
  else result=await api('GET',`/messages?folder_id=${S.currentFolder}&page=${S.currentPage}&page_size=50`);
  if (!result){list.innerHTML='<div class="empty-state"><p>Failed to load</p></div>';return;}
  S.totalMessages=result.total||(result.messages||[]).length;
  if (append) S.messages.push(...(result.messages||[]));
  else S.messages=result.messages||[];
  renderMessageList();
  document.getElementById('panel-count').textContent=S.totalMessages>0?S.totalMessages+' messages':'';
}

function setFilter(mode) {
  S.filterUnread = (mode === 'unread');
  S.filterAttachment = (mode === 'attachment');
  S.sortOrder = (mode === 'unread' || mode === 'default' || mode === 'attachment') ? 'date-desc' : mode;

  // Update checkmarks
  ['default','unread','attachment','date-desc','date-asc','size-desc'].forEach(k => {
    const el = document.getElementById('fopt-'+k);
    if (el) el.textContent = (k === mode ? '✓ ' : '○ ') + el.textContent.slice(2);
  });

  // Update button label
  const labels = {
    'default':'Filter', 'unread':'Unread', 'attachment':'📎 Has Attachment',
    'date-desc':'↓ Date', 'date-asc':'↑ Date', 'size-desc':'↓ Size'
  };
  const labelEl = document.getElementById('filter-label');
  if (labelEl) {
    labelEl.textContent = labels[mode] || 'Filter';
    labelEl.style.color = mode !== 'default' ? 'var(--accent)' : '';
  }
  const menuEl = document.getElementById('filter-dropdown-menu');
  if (menuEl) menuEl.style.display = 'none';
  renderMessageList();
}

// Keep old names as aliases so nothing else breaks
function toggleFilterUnread() { setFilter(S.filterUnread ? 'default' : 'unread'); }
function setSortOrder(order) { setFilter(order); }

// ── Multi-select state ────────────────────────────────────────
if (!window.SEL) window.SEL = { ids: new Set(), lastIdx: -1 };

function renderMessageList() {
  const list=document.getElementById('message-list');
  let msgs = [...S.messages];

  // Filter
  if (S.filterUnread) msgs = msgs.filter(m => !m.is_read);
  if (S.filterAttachment) msgs = msgs.filter(m => m.has_attachment);

  // Sort
  if (S.sortOrder === 'date-asc') msgs.sort((a,b) => new Date(a.date)-new Date(b.date));
  else if (S.sortOrder === 'size-desc') msgs.sort((a,b) => (b.size||0)-(a.size||0));
  else msgs.sort((a,b) => new Date(b.date)-new Date(a.date));

  if (!msgs.length){
    const emptyMsg = S.filterUnread ? 'No unread messages' : S.filterAttachment ? 'No messages with attachments' : 'No messages';
    list.innerHTML=`<div class="empty-state"><svg viewBox="0 0 24 24"><path d="M20 4H4c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V6c0-1.1-.9-2-2-2zm0 4l-8 5-8-5V6l8 5 8-5v2z"/></svg><p>${emptyMsg}</p></div>`;
    return;
  }

  // Update bulk action bar
  updateBulkBar();

  list.innerHTML=msgs.map((m,i)=>`
    <div class="message-item ${m.id===S.selectedMessageId&&!SEL.ids.size?'active':''} ${!m.is_read?'unread':''} ${SEL.ids.has(m.id)?'selected':''}"
         data-id="${m.id}" data-idx="${i}"
         draggable="true"
         onclick="handleMsgClick(event,${m.id},${i})"
         oncontextmenu="showMessageMenu(event,${m.id})"
         ondragstart="handleMsgDragStart(event,${m.id})">
      <div class="msg-top">
        <span class="msg-from">${esc(m.from_name||m.from_email)}</span>
        <span class="msg-date">${formatDate(m.date)}</span>
      </div>
      <div class="msg-subject">${esc(m.subject||'(no subject)')}</div>
      <div class="msg-preview">${esc(m.preview||'')}</div>
      <div class="msg-meta">
        <span class="msg-dot" style="background:${m.account_color}"></span>
        <span class="msg-acct">${esc(m.account_email||'')}</span>
        ${m.size?`<span style="font-size:10px;color:var(--muted);margin-left:4px">${formatSize(m.size)}</span>`:''}
        ${m.has_attachment?'<svg width="11" height="11" viewBox="0 0 24 24" fill="var(--muted)" style="margin-left:4px"><path d="M16.5 6v11.5c0 2.21-1.79 4-4 4s-4-1.79-4-4V5c0-1.38 1.12-2.5 2.5-2.5s2.5 1.12 2.5 2.5v10.5c0 .55-.45 1-1 1s-1-.45-1-1V6H10v9.5c0 1.38 1.12 2.5 2.5 2.5s2.5-1.12 2.5-2.5V5c0-2.21-1.79-4-4-4S7 2.79 7 5v12.5c0 3.04 2.46 5.5 5.5 5.5s5.5-2.46 5.5-5.5V6h-1.5z"/></svg>':''}
        <span class="msg-star ${m.is_starred?'on':''}" onclick="toggleStar(${m.id},event)">${m.is_starred?'★':'☆'}</span>
      </div>
    </div>`).join('')+(S.messages.length<S.totalMessages
    ?`<div class="load-more"><button class="load-more-btn" onclick="loadMoreMessages()">Load more</button></div>`:'');

  // Enable drag-drop onto folder nav items
  document.querySelectorAll('.nav-item[data-fid]').forEach(el=>{
    el.ondragover=e=>{e.preventDefault();el.classList.add('drag-over');};
    el.ondragleave=()=>el.classList.remove('drag-over');
    el.ondrop=e=>{
      e.preventDefault(); el.classList.remove('drag-over');
      const fid=parseInt(el.dataset.fid);
      if (!fid) return;
      const ids = SEL.ids.size ? [...SEL.ids] : [parseInt(e.dataTransfer.getData('text/plain'))];
      ids.forEach(id=>moveMessage(id, fid, true));
      SEL.ids.clear(); updateBulkBar(); renderMessageList();
    };
  });
}

function handleMsgClick(e, id, idx) {
  if (e.ctrlKey || e.metaKey) {
    // Toggle selection
    SEL.ids.has(id) ? SEL.ids.delete(id) : SEL.ids.add(id);
    SEL.lastIdx = idx;
    renderMessageList(); return;
  }
  if (e.shiftKey && SEL.lastIdx >= 0) {
    // Range select
    const msgs = getFilteredSortedMsgs();
    const lo=Math.min(SEL.lastIdx,idx), hi=Math.max(SEL.lastIdx,idx);
    for (let i=lo;i<=hi;i++) SEL.ids.add(msgs[i].id);
    renderMessageList(); return;
  }
  SEL.ids.clear(); SEL.lastIdx=idx;
  openMessage(id);
}

function getFilteredSortedMsgs() {
  let msgs=[...S.messages];
  if (S.filterUnread) msgs=msgs.filter(m=>!m.is_read);
  if (S.filterAttachment) msgs=msgs.filter(m=>m.has_attachment);
  if (S.sortOrder==='date-asc') msgs.sort((a,b)=>new Date(a.date)-new Date(b.date));
  else if (S.sortOrder==='size-desc') msgs.sort((a,b)=>(b.size||0)-(a.size||0));
  else msgs.sort((a,b)=>new Date(b.date)-new Date(a.date));
  return msgs;
}

function handleMsgDragStart(e, id) {
  if (!SEL.ids.has(id)) { SEL.ids.clear(); SEL.ids.add(id); }
  e.dataTransfer.setData('text/plain', id);
  e.dataTransfer.effectAllowed='move';
}

function updateBulkBar() {
  let bar = document.getElementById('bulk-action-bar');
  if (!bar) {
    bar = document.createElement('div');
    bar.id='bulk-action-bar';
    bar.style.cssText='display:none;position:sticky;top:0;z-index:10;background:var(--accent);color:#fff;padding:6px 12px;font-size:12px;display:flex;align-items:center;gap:8px';
    bar.innerHTML=`<span id="bulk-count"></span>
      <button onclick="bulkMarkRead(true)" style="font-size:11px;padding:2px 8px;background:rgba(255,255,255,.2);border:none;border-radius:4px;color:#fff;cursor:pointer">Mark read</button>
      <button onclick="bulkMarkRead(false)" style="font-size:11px;padding:2px 8px;background:rgba(255,255,255,.2);border:none;border-radius:4px;color:#fff;cursor:pointer">Mark unread</button>
      <button onclick="bulkDelete()" style="font-size:11px;padding:2px 8px;background:rgba(255,255,255,.2);border:none;border-radius:4px;color:#fff;cursor:pointer">Delete</button>
      <button onclick="SEL.ids.clear();renderMessageList()" style="margin-left:auto;font-size:11px;padding:2px 8px;background:rgba(255,255,255,.2);border:none;border-radius:4px;color:#fff;cursor:pointer">✕ Clear</button>`;
    document.getElementById('message-list').before(bar);
  }
  if (SEL.ids.size) {
    bar.style.display='flex';
    document.getElementById('bulk-count').textContent=SEL.ids.size+' selected';
  } else {
    bar.style.display='none';
  }
}

async function bulkMarkRead(read) {
  await Promise.all([...SEL.ids].map(id=>api('PUT','/messages/'+id+'/read',{read})));
  SEL.ids.forEach(id=>{const m=S.messages.find(m=>m.id===id);if(m)m.is_read=read;});
  SEL.ids.clear(); renderMessageList(); loadFolders();
}

async function bulkDelete() {
  const count = SEL.ids.size;
  inlineConfirm(
    `Delete ${count} message${count===1?'':'s'}? This cannot be undone.`,
    async () => {
      const ids = [...SEL.ids];
      await Promise.all(ids.map(id=>api('DELETE','/messages/'+id)));
      ids.forEach(id=>{S.messages=S.messages.filter(m=>m.id!==id);});
      SEL.ids.clear(); renderMessageList(); loadFolders();
    }
  );
}

function loadMoreMessages(){ S.currentPage++; loadMessages(true); }

async function openMessage(id) {
  S.selectedMessageId=id; renderMessageList();
  const detail=document.getElementById('message-detail');
  detail.innerHTML='<div class="spinner" style="margin-top:100px"></div>';
  const msg=await api('GET','/messages/'+id);
  if (!msg){detail.innerHTML='<div class="no-message"><p>Failed to load</p></div>';return;}
  S.currentMessage=msg;
  renderMessageDetail(msg, false);
  const li=S.messages.find(m=>m.id===id);
  if (li&&!li.is_read){
    li.is_read=true; renderMessageList();
    // Sync read status to server (enqueues IMAP op via backend)
    api('PUT','/messages/'+id+'/read',{read:true});
  }
}

// ── External link navigation whitelist ───────────────────────────────────────
// Persisted in sessionStorage so it resets on tab close (safety default).
const _extNavOk = new Set(JSON.parse(sessionStorage.getItem('extNavOk')||'[]'));
function _saveExtNavOk(){ sessionStorage.setItem('extNavOk', JSON.stringify([..._extNavOk])); }

function confirmExternalNav(url) {
  const origin = (() => { try { return new URL(url).origin; } catch(e){ return url; } })();
  if (_extNavOk.has(origin)) { window.open(url,'_blank','noopener,noreferrer'); return; }
  const overlay = document.createElement('div');
  overlay.className = 'modal-overlay open';
  overlay.innerHTML = `<div class="modal" style="max-width:480px">
    <h2 style="margin:0 0 12px">Open external link?</h2>
    <div style="word-break:break-all;background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:10px;font-size:12px;font-family:monospace;margin-bottom:16px;color:var(--text2)">${esc(url)}</div>
    <p style="margin:0 0 20px;font-size:13px;color:var(--text2)">This link was in a received email. Opening it will take you to an external website.</p>
    <div style="display:flex;gap:8px;flex-wrap:wrap">
      <button class="btn-primary" id="enav-once">Open once</button>
      <button class="btn-primary" id="enav-always" style="background:var(--accent2,#2a7)">Always allow ${esc(origin)}</button>
      <button class="action-btn" id="enav-cancel">Cancel</button>
    </div>
  </div>`;
  document.body.appendChild(overlay);
  overlay.querySelector('#enav-once').onclick = () => { overlay.remove(); window.open(url,'_blank','noopener,noreferrer'); };
  overlay.querySelector('#enav-always').onclick = () => { _extNavOk.add(origin); _saveExtNavOk(); overlay.remove(); window.open(url,'_blank','noopener,noreferrer'); };
  overlay.querySelector('#enav-cancel').onclick = () => overlay.remove();
  overlay.onclick = e => { if(e.target===overlay) overlay.remove(); };
}

function renderMessageDetail(msg, showRemoteContent) {
  const detail=document.getElementById('message-detail');
  const allowed=showRemoteContent||S.remoteWhitelist.has(msg.from_email);

  const cssReset = `<style>html,body{background:#ffffff!important;color:#1a1a1a!important;` +
    `font-family:Arial,sans-serif;font-size:14px;line-height:1.5;margin:8px}a{color:#1a5fb4}` +
    `img{max-width:100%;height:auto}iframe{display:none!important}</style>`;

  // Injected into srcdoc: reports height + intercepts all link clicks → postMessage to parent
  const heightScript = `<script>
    function _reportH(){parent.postMessage({type:'gomail-frame-h',h:document.documentElement.scrollHeight},'*');}
    document.addEventListener('DOMContentLoaded',_reportH);
    window.addEventListener('load',_reportH);
    new MutationObserver(_reportH).observe(document.documentElement,{subtree:true,childList:true,attributes:true});
    document.addEventListener('click',function(e){
      var el=e.target; while(el&&el.tagName!=='A') el=el.parentElement;
      if(!el) return;
      var href=el.getAttribute('href');
      if(!href||href.startsWith('#')||href.startsWith('mailto:')) return;
      e.preventDefault(); e.stopPropagation();
      parent.postMessage({type:'gomail-open-url',url:href},'*');
    },true);
  <\/script>`;

  const sandboxAttr = 'allow-scripts allow-popups allow-popups-to-escape-sandbox';

  function stripUnresolvedCID(h){ return h.replace(/src\s*=\s*(['"])cid:[^'"]*\1/gi,'src=""').replace(/src\s*=\s*cid:\S+/gi,'src=""'); }
  function stripEmbeddedFrames(h){ return h.replace(/<iframe[\s\S]*?<\/iframe>/gi,'').replace(/<iframe[^>]*>/gi,''); }
  function stripRemoteImages(h){
    return h.replace(/<img(\s[^>]*?)src\s*=\s*(['"])(https?:\/\/[^'"]+)\2/gi,'<img$1src="" data-blocked-src="$3"')
            .replace(/url\s*\(\s*(['"]?)https?:\/\/[^)'"]+\1\s*\)/gi,'url()')
            .replace(/<link[^>]*>/gi,'').replace(/<script[\s\S]*?<\/script>/gi,'');
  }

  let bodyHtml='';
  if (msg.body_html) {
    let html = stripUnresolvedCID(stripEmbeddedFrames(msg.body_html));
    if (allowed) {
      const srcdoc = cssReset + heightScript + html;
      bodyHtml=`<iframe id="msg-frame" sandbox="${sandboxAttr}"
        style="width:100%;border:none;min-height:200px;display:block"
        srcdoc="${srcdoc.replace(/"/g,'&quot;')}"></iframe>`;
    } else {
      const stripped = stripRemoteImages(html);
      bodyHtml=`<div class="remote-content-banner">
        <svg viewBox="0 0 24 24" width="14" height="14" fill="currentColor"><path d="M21 19V5c0-1.1-.9-2-2-2H5c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2zM8.5 13.5l2.5 3.01L14.5 12l4.5 6H5l3.5-4.5z"/></svg>
        Remote images blocked.
        <button class="rcb-btn" onclick="renderMessageDetail(S.currentMessage,true)">Load images</button>
        <button class="rcb-btn" onclick="whitelistSender('${esc(msg.from_email)}')">Always allow from ${esc(msg.from_email)}</button>
      </div>
      <iframe id="msg-frame" sandbox="${sandboxAttr}"
        style="width:100%;border:none;min-height:200px;display:block"
        srcdoc="${(cssReset + heightScript + stripped).replace(/"/g,'&quot;')}"></iframe>`;
    }
  } else {
    bodyHtml=`<div class="detail-body-text">${esc(msg.body_text||'(empty)')}</div>`;
  }

  let attachHtml='';
  if (msg.attachments?.length) {
    const chips = msg.attachments.map(a=>{
      const url=`/api/messages/${msg.id}/attachments/${a.id}`;
      const ct=a.content_type||'';
      const viewable=/^(image\/|text\/|application\/pdf$|video\/|audio\/)/.test(ct);
      const icon=ct.startsWith('image/')?'🖼':ct==='application/pdf'?'📄':ct.startsWith('video/')?'🎬':ct.startsWith('audio/')?'🎵':'📎';
      if(viewable){
        return `<a class="attachment-chip" href="${url}" target="_blank" rel="noopener" title="Open ${esc(a.filename)}">${icon} <span>${esc(a.filename)}</span><span style="color:var(--muted);font-size:10px"> ${formatSize(a.size)}</span></a>`;
      }
      return `<a class="attachment-chip" href="${url}" download="${esc(a.filename)}" title="Download ${esc(a.filename)}">${icon} <span>${esc(a.filename)}</span><span style="color:var(--muted);font-size:10px"> ${formatSize(a.size)}</span></a>`;
    }).join('');
    const dlAll=`<button class="attachment-chip" onclick="downloadAllAttachments(${msg.id})" style="cursor:pointer;border:1px solid var(--border)">⬇ <span>Download all</span></button>`;
    attachHtml=`<div class="attachments-bar">${dlAll}${chips}</div>`;
  }


  detail.innerHTML=`
    <div class="detail-header">
      <div class="detail-subject">${esc(msg.subject||'(no subject)')}</div>
      <div class="detail-meta">
        <div class="detail-from">
          <strong>${esc(msg.from_name||msg.from_email)}</strong>
          ${msg.from_name?`<span style="color:var(--muted);font-size:12px"> &lt;${esc(msg.from_email)}&gt;</span>`:''}
          ${msg.to?`<div style="font-size:12px;color:var(--muted);margin-top:2px">To: ${esc(msg.to)}</div>`:''}
          ${msg.cc?`<div style="font-size:12px;color:var(--muted)">CC: ${esc(msg.cc)}</div>`:''}
        </div>
        <div class="detail-date">${formatFullDate(msg.date)}</div>
      </div>
    </div>
    <div class="detail-actions">
      <button class="action-btn" onclick="openReply()">↩ Reply</button>
      <button class="action-btn" onclick="openForward()">↪ Forward</button>
      <button class="action-btn" onclick="openForwardAsAttachment()" title="Forward the original message as an .eml file attachment">↪ Fwd as Attachment</button>
      <button class="action-btn" onclick="toggleStar(${msg.id})">${msg.is_starred?'★ Unstar':'☆ Star'}</button>
      <button class="action-btn" onclick="markRead(${msg.id},${!msg.is_read})">${msg.is_read?'Mark unread':'Mark read'}</button>
      <button class="action-btn" onclick="showMessageHeaders(${msg.id})">⋮ Headers</button>
      <button class="action-btn" onclick="downloadEML(${msg.id})">⬇ Download</button>
      <button class="action-btn danger" onclick="deleteMessage(${msg.id})">🗑 Delete</button>
    </div>
    ${attachHtml}
    <div class="detail-body">${bodyHtml}</div>`;

  // Auto-size iframe via postMessage from injected height-reporting script.
  // We cannot use contentDocument (null without allow-same-origin in sandbox).
  if (msg.body_html) {
    const frame = document.getElementById('msg-frame');
    if (frame) {
      // Clean up any previous listener
      if (window._frameMsgHandler) window.removeEventListener('message', window._frameMsgHandler);
      let lastH = 0;
      window._frameMsgHandler = (e) => {
        if (e.data?.type === 'gomail-frame-h' && e.data.h > 50) {
          const h = e.data.h + 24;
          if (Math.abs(h - lastH) > 4) {
            lastH = h;
            frame.style.height = h + 'px';
          }
        } else if (e.data?.type === 'gomail-open-url' && e.data.url) {
          confirmExternalNav(e.data.url);
        }
      };
      window.addEventListener('message', window._frameMsgHandler);
    }
  }
}

// Download all attachments for a message sequentially
async function downloadAllAttachments(msgId) {
  const msg = S.currentMessage;
  if (!msg?.attachments?.length) return;
  for (const a of msg.attachments) {
    const url = `/api/messages/${msgId}/attachments/${a.id}`;
    try {
      const resp = await fetch(url);
      const blob = await resp.blob();
      const tmp = document.createElement('a');
      tmp.href = URL.createObjectURL(blob);
      tmp.download = a.filename || 'attachment';
      tmp.click();
      URL.revokeObjectURL(tmp.href);
      // Small delay to avoid browser throttling sequential downloads
      await new Promise(r => setTimeout(r, 400));
    } catch(e) { toast('Failed to download '+esc(a.filename),'error'); }
  }
}

async function whitelistSender(sender) {
  const r=await api('POST','/remote-content-whitelist',{sender});
  if (r?.ok){S.remoteWhitelist.add(sender);toast('Always allowing content from '+sender,'success');if(S.currentMessage)renderMessageDetail(S.currentMessage,false);}
}

async function showMessageHeaders(id) {
  const r=await api('GET','/messages/'+id+'/headers');
  if (!r?.headers) return;
  const rows=Object.entries(r.headers).filter(([,v])=>v)
    .map(([k,v])=>`<tr><td style="color:var(--muted);padding:4px 12px 4px 0;font-size:12px;white-space:nowrap;vertical-align:top">${esc(k)}</td><td style="font-size:12px;word-break:break-all">${esc(v)}</td></tr>`).join('');
  const rawText = r.raw||'';
  const overlay=document.createElement('div');
  overlay.className='modal-overlay open';
  overlay.innerHTML=`<div class="modal" style="width:660px;max-height:85vh;display:flex;flex-direction:column">
    <div style="display:flex;justify-content:space-between;align-items:center;margin-bottom:16px">
      <h2 style="margin:0">Message Headers</h2>
      <button class="icon-btn" onclick="this.closest('.modal-overlay').remove()"><svg viewBox="0 0 24 24"><path d="M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z"/></svg></button>
    </div>
    <div style="overflow-y:auto;flex:1">
      <table style="width:100%;margin-bottom:16px"><tbody>${rows}</tbody></table>
      <div style="font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.7px;margin-bottom:6px">Raw Headers</div>
      <div style="position:relative">
        <textarea id="raw-headers-ta" readonly style="width:100%;box-sizing:border-box;height:180px;background:var(--bg);border:1px solid var(--border);border-radius:6px;color:var(--text2);font-family:monospace;font-size:11px;padding:10px;resize:vertical;outline:none">${esc(rawText)}</textarea>
        <button onclick="navigator.clipboard.writeText(document.getElementById('raw-headers-ta').value).then(()=>toast('Copied','success'))"
          style="position:absolute;top:6px;right:8px;font-size:11px;padding:3px 10px;background:var(--surface2);border:1px solid var(--border);border-radius:4px;color:var(--text2);cursor:pointer">Copy</button>
      </div>
    </div>
  </div>`;
  overlay.addEventListener('click',e=>{if(e.target===overlay)overlay.remove();});
  document.body.appendChild(overlay);
}

function downloadEML(id) {
  window.open('/api/messages/'+id+'/download.eml','_blank');
}

function showMessageMenu(e, id) {
  e.preventDefault(); e.stopPropagation();
  const msg = S.messages.find(m=>m.id===id);
  const otherFolders = S.folders.filter(f=>!f.is_hidden&&f.id!==S.currentFolder).slice(0,16);
  const moveItems = otherFolders.map(f=>`<div class="ctx-item ctx-sub-item" onclick="moveMessage(${id},${f.id});closeMenu()">${esc(f.name)}</div>`).join('');
  const moveSub = otherFolders.length ? `
    <div class="ctx-item ctx-has-sub">📂 Move to
      <span class="ctx-sub-arrow">›</span>
      <div class="ctx-submenu">${moveItems}</div>
    </div>` : '';
  showCtxMenu(e,`
    <div class="ctx-item" onclick="openReplyTo(${id});closeMenu()">↩ Reply</div>
    <div class="ctx-item" onclick="toggleStar(${id});closeMenu()">${msg?.is_starred?'★ Unstar':'☆ Star'}</div>
    <div class="ctx-item" onclick="markRead(${id},${msg?.is_read?'false':'true'});closeMenu()">${msg?.is_read?'Mark unread':'Mark read'}</div>
    <div class="ctx-sep"></div>
    ${moveSub}
    <div class="ctx-item" onclick="showMessageHeaders(${id});closeMenu()">⋮ View headers</div>
    <div class="ctx-item" onclick="downloadEML(${id});closeMenu()">⬇ Download .eml</div>
    <div class="ctx-sep"></div>
    <div class="ctx-item danger" onclick="deleteMessage(${id});closeMenu()">🗑 Delete</div>`);
}

async function toggleStar(id, e) {
  if(e) e.stopPropagation();
  const r=await api('PUT','/messages/'+id+'/star');
  if (r){const m=S.messages.find(m=>m.id===id);if(m)m.is_starred=r.starred;renderMessageList();
    if(S.currentMessage?.id===id){S.currentMessage.is_starred=r.starred;renderMessageDetail(S.currentMessage,false);}}
}

async function markRead(id, read) {
  await api('PUT','/messages/'+id+'/read',{read});
  const m=S.messages.find(m=>m.id===id);if(m){m.is_read=read;renderMessageList();}
  loadFolders();
}

async function moveMessage(msgId, folderId, silent=false) {
  const folder = S.folders.find(f=>f.id===folderId);
  const doMove = async () => {
    const r=await api('PUT','/messages/'+msgId+'/move',{folder_id:folderId});
    if(r?.ok){if(!silent)toast('Moved','success');S.messages=S.messages.filter(m=>m.id!==msgId);
      if(S.currentMessage?.id===msgId)resetDetail();loadFolders();}
    else if(!silent) toast('Move failed','error');
  };
  if (silent) { doMove(); return; }
  inlineConfirm(`Move this message to "${folder?.name||'selected folder'}"?`, doMove);
}

async function deleteMessage(id) {
  inlineConfirm('Delete this message?', async () => {
    const r=await api('DELETE','/messages/'+id);
    if(r?.ok){toast('Deleted','success');S.messages=S.messages.filter(m=>m.id!==id);renderMessageList();
      if(S.currentMessage?.id===id)resetDetail();loadFolders();}
    else toast('Delete failed','error');
  });
}

function resetDetail() {
  S.currentMessage=null;S.selectedMessageId=null;
  document.getElementById('message-detail').innerHTML=`<div class="no-message">
    <svg viewBox="0 0 24 24"><path d="M20 4H4c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V6c0-1.1-.9-2-2-2zm0 4l-8 5-8-5V6l8 5 8-5v2z"/></svg>
    <h3>Select a message</h3><p>Choose a message to read it</p></div>`;
}

function formatSize(b){if(!b)return'';if(b<1024)return b+' B';if(b<1048576)return Math.round(b/1024)+' KB';return(b/1048576).toFixed(1)+' MB';}

// ── Compose ────────────────────────────────────────────────────────────────
let composeAttachments=[];

function populateComposeFrom() {
  const sel=document.getElementById('compose-from');
  if(!sel) return;
  sel.innerHTML=S.accounts.map(a=>`<option value="${a.id}">${esc(a.display_name||a.email_address)} &lt;${esc(a.email_address)}&gt;</option>`).join('');
}

function openCompose(opts={}) {
  S.composeMode=opts.mode||'new'; S.composeReplyToId=opts.replyId||null;
  composeAttachments=[];
  document.getElementById('compose-title').textContent=opts.title||'New Message';
  document.getElementById('compose-minimised-label').textContent=opts.title||'New Message';
  // Clear tag containers and re-init
  ['compose-to','compose-cc-tags','compose-bcc-tags'].forEach(id=>{
    const c=document.getElementById(id);
    if(c){ c.innerHTML=''; initTagField(id); }
  });
  document.getElementById('compose-subject').value=opts.subject||'';
  document.getElementById('cc-row').style.display='none';
  document.getElementById('bcc-row').style.display='none';
  const editor=document.getElementById('compose-editor');
  editor.innerHTML=opts.body||'';
  S.draftDirty=false;
  updateAttachList();
  showCompose();
  setTimeout(()=>{ const inp=document.querySelector('#compose-to .tag-input'); if(inp) inp.focus(); },80);
  startDraftAutosave();
}

function showCompose() {
  const d=document.getElementById('compose-dialog');
  const m=document.getElementById('compose-minimised');
  d.style.display='flex';
  m.style.display='none';
  S.composeVisible=true; S.composeMinimised=false;
  initComposeDragDrop();
}

function minimizeCompose() {
  document.getElementById('compose-dialog').style.display='none';
  document.getElementById('compose-minimised').style.display='flex';
  S.composeMinimised=true;
}

function restoreCompose() {
  showCompose();
}

function closeCompose(skipCheck) {
  if (!skipCheck && S.draftDirty) {
    inlineConfirm('Save draft before closing?',
      ()=>{ saveDraft(); _closeCompose(); },
      ()=>{ _closeCompose(); }
    );
    return;
  }
  _closeCompose();
}

function _closeCompose() {
  document.getElementById('compose-dialog').style.display='none';
  document.getElementById('compose-minimised').style.display='none';
  clearDraftAutosave();
  S.composeVisible=false; S.composeMinimised=false; S.draftDirty=false;
}

function showCCRow()  { document.getElementById('cc-row').style.display='flex'; }
function showBCCRow() { document.getElementById('bcc-row').style.display='flex'; }

function openReply() { if (S.currentMessage) openReplyTo(S.currentMessage.id); }

function openReplyTo(msgId) {
  const msg=(S.currentMessage?.id===msgId)?S.currentMessage:S.messages.find(m=>m.id===msgId);
  if (!msg) return;
  openCompose({
    mode:'reply', replyId:msgId, title:'Reply',
    subject:msg.subject&&!msg.subject.startsWith('Re:')?'Re: '+msg.subject:(msg.subject||''),
    body:`<br><br><div class="quote-divider">—— Original message ——</div><blockquote>${msg.body_html||('<pre>'+esc(msg.body_text||'')+'</pre>')}</blockquote>`,
  });
  addTag('compose-to', msg.from_email||'');
}

function openForward() {
  if (!S.currentMessage) return;
  const msg=S.currentMessage;
  S.composeForwardFromId=msg.id;
  openCompose({
    mode:'forward', forwardId:msg.id, title:'Forward',
    subject:'Fwd: '+(msg.subject||''),
    body:`<br><br><div class="quote-divider">—— Forwarded message ——<br>From: ${esc(msg.from_email||'')}</div><blockquote>${msg.body_html||('<pre>'+esc(msg.body_text||'')+'</pre>')}</blockquote>`,
  });
}

function openForwardAsAttachment() {
  if (!S.currentMessage) return;
  const msg=S.currentMessage;
  S.composeForwardFromId=msg.id;
  openCompose({
    mode:'forward-attachment', forwardId:msg.id, title:'Forward as Attachment',
    subject:'Fwd: '+(msg.subject||''),
    body:'',
  });
  // Add a visual placeholder chip (the actual EML is fetched server-side)
  composeAttachments=[{name: sanitizeSubject(msg.subject||'message')+'.eml', size:0, isForward:true}];
  updateAttachList();
}

function sanitizeSubject(s){return s.replace(/[/\\:*?"<>|]/g,'_').slice(0,60)||'message';}

// ── Email Tag Input ────────────────────────────────────────────────────────
function initTagField(containerId) {
  const container=document.getElementById(containerId);
  if (!container) return;
  // Remove any existing input first
  const old=container.querySelector('.tag-input');
  if(old) old.remove();

  const inp=document.createElement('input');
  inp.type='text';
  inp.className='tag-input';
  inp.placeholder=containerId==='compose-to'?'recipient@example.com':'';
  inp.setAttribute('autocomplete','off');
  inp.setAttribute('spellcheck','false');
  container.appendChild(inp);

  const commit = () => {
    const v=inp.value.trim().replace(/[,;\s]+$/,'');
    if(v){ addTag(containerId,v); inp.value=''; }
  };

  inp.addEventListener('keydown', e=>{
    if(e.key==='Enter'||e.key===','||e.key===';') { e.preventDefault(); commit(); }
    else if(e.key===' ') {
      // Space commits only if value looks like an email
      const v=inp.value.trim();
      if(v && /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(v)) { e.preventDefault(); commit(); }
    } else if(e.key==='Backspace'&&!inp.value) {
      const tags=container.querySelectorAll('.email-tag');
      if(tags.length) tags[tags.length-1].remove();
    }
    S.draftDirty=true;
  });
  inp.addEventListener('blur', commit);
  container.addEventListener('click', e=>{ if(e.target===container||e.target.tagName==='LABEL') inp.focus(); else if(!e.target.closest('.email-tag')) inp.focus(); });
}

function addTag(containerId, value) {
  if (!value) return;
  const container=document.getElementById(containerId);
  if (!container) return;
  const isValid=/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value);
  const tag=document.createElement('span');
  tag.className='email-tag'+(isValid?'':' invalid');
  tag.dataset.email=value;
  const label=document.createElement('span');
  label.textContent=value;
  const remove=document.createElement('button');
  remove.innerHTML='×'; remove.className='tag-remove'; remove.type='button';
  remove.onclick=e=>{e.stopPropagation();tag.remove();S.draftDirty=true;};
  tag.appendChild(label); tag.appendChild(remove);
  const inp=container.querySelector('.tag-input');
  container.insertBefore(tag, inp||null);
  S.draftDirty=true;
}

function getTagValues(containerId) {
  return Array.from(document.querySelectorAll('#'+containerId+' .email-tag'))
    .map(t=>t.dataset.email||t.querySelector('span')?.textContent||'').filter(Boolean);
}

// ── Draft autosave ─────────────────────────────────────────────────────────
function startDraftAutosave() {
  clearDraftAutosave();
  S.draftTimer=setInterval(()=>{ if(S.draftDirty) saveDraft(true); }, 60000);
  const editor=document.getElementById('compose-editor');
  if(editor) editor.oninput=()=>S.draftDirty=true;
}

function clearDraftAutosave() {
  if(S.draftTimer){ clearInterval(S.draftTimer); S.draftTimer=null; }
}

async function saveDraft(silent) {
  S.draftDirty=false;
  const accountId=parseInt(document.getElementById('compose-from')?.value||0);
  if(!accountId){ if(!silent) toast('Draft saved locally','success'); return; }
  const editor=document.getElementById('compose-editor');
  const meta={
    account_id:accountId,
    to:getTagValues('compose-to'),
    subject:document.getElementById('compose-subject').value,
    body_html:editor.innerHTML.trim(),
    body_text:editor.innerText.trim(),
  };
  const r=await api('POST','/draft',meta);
  if(!silent) toast('Draft saved','success');
  else if(r?.ok) toast('Draft auto-saved to server','success');
}

// ── Compose formatting ─────────────────────────────────────────────────────
function execFmt(cmd,val) { document.getElementById('compose-editor').focus(); document.execCommand(cmd,false,val||null); }
function triggerAttach() { document.getElementById('compose-attach-input').click(); }
function handleAttachFiles(input) { for(const file of input.files) composeAttachments.push({file,name:file.name,size:file.size}); input.value=''; updateAttachList(); S.draftDirty=true; }
function removeAttachment(i) {
  // Don't remove EML forward placeholder (isForward) from UI; it's handled server-side
  if(composeAttachments[i]?.isForward && S.composeMode==='forward-attachment'){
    toast('The original message will be attached when sent','info'); return;
  }
  composeAttachments.splice(i,1); updateAttachList();
}
function updateAttachList() {
  const el=document.getElementById('compose-attach-list');
  if(!composeAttachments.length){el.innerHTML='';return;}
  el.innerHTML=composeAttachments.map((a,i)=>`<div class="attachment-chip">
    📎 <span>${esc(a.name)}</span>
    <span style="color:var(--muted);font-size:10px">${a.size?formatSize(a.size):''}</span>
    <button onclick="removeAttachment(${i})" class="tag-remove" type="button">×</button>
  </div>`).join('');
}

// ── Compose drag-and-drop attachments ──────────────────────────────────────
function initComposeDragDrop() {
  const dialog=document.getElementById('compose-dialog');
  if(!dialog) return;
  dialog.addEventListener('dragover', e=>{
    e.preventDefault(); e.stopPropagation();
    dialog.classList.add('drag-over');
  });
  dialog.addEventListener('dragleave', e=>{
    if(!dialog.contains(e.relatedTarget)) dialog.classList.remove('drag-over');
  });
  dialog.addEventListener('drop', e=>{
    e.preventDefault(); e.stopPropagation();
    dialog.classList.remove('drag-over');
    if(e.dataTransfer?.files?.length){
      for(const file of e.dataTransfer.files) composeAttachments.push({file,name:file.name,size:file.size});
      updateAttachList(); S.draftDirty=true;
      toast(`${e.dataTransfer.files.length} file(s) attached`,'success');
    }
  });
}

async function sendMessage() {
  const accountId=parseInt(document.getElementById('compose-from')?.value||0);
  const to=getTagValues('compose-to');
  if(!accountId||!to.length){toast('From account and To address required','error');return;}
  const editor=document.getElementById('compose-editor');
  const bodyHTML=editor.innerHTML.trim(), bodyText=editor.innerText.trim();
  const btn=document.getElementById('send-btn');
  btn.disabled=true; btn.textContent='Sending…';

  const endpoint=S.composeMode==='reply'?'/reply'
    :S.composeMode==='forward'?'/forward'
    :S.composeMode==='forward-attachment'?'/forward-attachment'
    :'/send';

  const meta={
    account_id:accountId, to,
    cc:getTagValues('compose-cc-tags'),
    bcc:getTagValues('compose-bcc-tags'),
    subject:document.getElementById('compose-subject').value,
    body_text:bodyText, body_html:bodyHTML,
    in_reply_to_id:S.composeMode==='reply'?S.composeReplyToId:0,
    forward_from_id:(S.composeMode==='forward'||S.composeMode==='forward-attachment')?S.composeForwardFromId:0,
  };

  let r;
  // Use FormData when there are real file attachments, OR when forwarding as attachment
  // (server needs multipart so it can read forward_from_id from meta and fetch the EML itself)
  const hasRealFiles = composeAttachments.some(a => a.file instanceof Blob);
  const needsFormData = hasRealFiles || S.composeMode === 'forward-attachment';
  if(needsFormData){
    const fd=new FormData();
    fd.append('meta', JSON.stringify(meta));
    for(const a of composeAttachments){
      if(a.file instanceof Blob){        // only append real File/Blob objects
        fd.append('file', a.file, a.name);
      }
      // isForward placeholders are intentionally skipped — the EML is fetched server-side
    }
    try{
      const resp=await fetch('/api'+endpoint,{method:'POST',body:fd});
      r=await resp.json();
    }catch(e){ r={error:String(e)}; }
  } else {
    r=await api('POST',endpoint,meta);
  }

  btn.disabled=false; btn.textContent='Send';
  if(r?.ok){ toast('Message sent!','success'); clearDraftAutosave(); _closeCompose(); }
  else toast(r?.error||'Send failed','error');
}

// ── Compose drag + all-edge resize ─────────────────────────────────────────
function saveComposeGeometry(dlg) {
  const r = dlg.getBoundingClientRect();
  document.cookie = `compose_geo=${JSON.stringify({l:Math.round(r.left),t:Math.round(r.top),w:Math.round(r.width),h:Math.round(r.height)})};path=/;max-age=31536000`;
}

function loadComposeGeometry(dlg) {
  try {
    const m = document.cookie.match(/compose_geo=([^;]+)/);
    if (!m) return false;
    const g = JSON.parse(decodeURIComponent(m[1]));
    if (!g.w||!g.h) return false;
    const maxL = window.innerWidth  - Math.max(360, g.w);
    const maxT = window.innerHeight - Math.max(280, g.h);
    dlg.style.left   = Math.max(0, Math.min(g.l, maxL)) + 'px';
    dlg.style.top    = Math.max(0, Math.min(g.t, maxT)) + 'px';
    dlg.style.width  = Math.max(360, g.w) + 'px';
    dlg.style.height = Math.max(280, g.h) + 'px';
    dlg.style.right  = 'auto'; dlg.style.bottom = 'auto';
    const editor = document.getElementById('compose-editor');
    if (editor) editor.style.height = (Math.max(280,g.h) - 242) + 'px';
    return true;
  } catch(e) { return false; }
}

function initComposeDragResize() {
  const dlg=document.getElementById('compose-dialog');
  if(!dlg) return;

  // Restore saved position/size, or fall back to default bottom-right
  if (!loadComposeGeometry(dlg)) {
    dlg.style.right='24px'; dlg.style.bottom='20px';
    dlg.style.left='auto';  dlg.style.top='auto';
  }

  // Drag by header
  const header=document.getElementById('compose-drag-handle');
  if(header) {
    let ox,oy,startL,startT;
    header.addEventListener('mousedown', e=>{
      if(e.target.closest('button')) return;
      const r=dlg.getBoundingClientRect();
      ox=e.clientX; oy=e.clientY; startL=r.left; startT=r.top;
      dlg.style.left=startL+'px'; dlg.style.top=startT+'px';
      dlg.style.right='auto'; dlg.style.bottom='auto';
      const mm=ev=>{
        dlg.style.left=Math.max(0,Math.min(window.innerWidth-dlg.offsetWidth, startL+(ev.clientX-ox)))+'px';
        dlg.style.top= Math.max(0,Math.min(window.innerHeight-30,         startT+(ev.clientY-oy)))+'px';
      };
      const mu=()=>{ document.removeEventListener('mousemove',mm); document.removeEventListener('mouseup',mu); saveComposeGeometry(dlg); };
      document.addEventListener('mousemove',mm);
      document.addEventListener('mouseup',mu);
      e.preventDefault();
    });
  }

  // Resize handles
  dlg.querySelectorAll('.compose-resize').forEach(handle=>{
    const dir=handle.dataset.dir;
    handle.addEventListener('mousedown', e=>{
      const rect=dlg.getBoundingClientRect();
      const startX=e.clientX,startY=e.clientY;
      const startW=rect.width,startH=rect.height,startL=rect.left,startT=rect.top;
      const mm=ev=>{
        let w=startW,h=startH,l=startL,t=startT;
        const dx=ev.clientX-startX, dy=ev.clientY-startY;
        if(dir.includes('e')) w=Math.max(360,startW+dx);
        if(dir.includes('w')){ w=Math.max(360,startW-dx); l=startL+startW-w; }
        if(dir.includes('s')) h=Math.max(280,startH+dy);
        if(dir.includes('n')){ h=Math.max(280,startH-dy); t=startT+startH-h; }
        dlg.style.width=w+'px'; dlg.style.height=h+'px';
        dlg.style.left=l+'px';  dlg.style.top=t+'px';
        dlg.style.right='auto'; dlg.style.bottom='auto';
        const editor=document.getElementById('compose-editor');
        if(editor) editor.style.height=(h-242)+'px';
      };
      const mu=()=>{ document.removeEventListener('mousemove',mm); document.removeEventListener('mouseup',mu); saveComposeGeometry(dlg); };
      document.addEventListener('mousemove',mm);
      document.addEventListener('mouseup',mu);
      e.preventDefault();
    });
  });
}

// ── Settings ───────────────────────────────────────────────────────────────
async function openSettings() {
  openModal('settings-modal');
  loadSyncInterval();
  renderMFAPanel();
  loadIPRules();
  // Pre-fill profile fields with current values
  const me = await api('GET', '/me');
  if (me) {
    document.getElementById('profile-username').placeholder = me.username || 'New username';
    document.getElementById('profile-email').placeholder = me.email || 'New email';
  }
}

async function updateProfile(field) {
  const value = document.getElementById('profile-' + field).value.trim();
  const password = document.getElementById('profile-confirm-pw').value;
  if (!value) { toast('Please enter a new ' + field, 'error'); return; }
  if (!password) { toast('Current password required to confirm changes', 'error'); return; }
  const r = await api('PUT', '/profile', { field, value, password });
  if (r?.ok) {
    toast(field.charAt(0).toUpperCase() + field.slice(1) + ' updated', 'success');
    document.getElementById('profile-' + field).value = '';
    document.getElementById('profile-confirm-pw').value = '';
  } else {
    toast(r?.error || 'Update failed', 'error');
  }
}

async function loadSyncInterval() {
  const r=await api('GET','/sync-interval');
  if(r) document.getElementById('sync-interval-select').value=String(r.sync_interval||15);
}

async function saveSyncInterval() {
  const val=parseInt(document.getElementById('sync-interval-select').value)||0;
  const r=await api('PUT','/sync-interval',{sync_interval:val});
  if(r?.ok) toast('Sync interval saved','success'); else toast('Failed','error');
}

async function changePassword() {
  const cur=document.getElementById('cur-pw').value, nw=document.getElementById('new-pw').value;
  if(!cur||!nw){toast('Both fields required','error');return;}
  const r=await api('POST','/change-password',{current_password:cur,new_password:nw});
  if(r?.ok){toast('Password updated','success');document.getElementById('cur-pw').value='';document.getElementById('new-pw').value='';}
  else toast(r?.error||'Failed','error');
}

async function renderMFAPanel() {
  const me=await api('GET','/me'); if(!me) return;
  const badge=document.getElementById('mfa-badge'), panel=document.getElementById('mfa-panel');
  if(me.mfa_enabled) {
    badge.innerHTML='<span class="badge green">Enabled</span>';
    panel.innerHTML=`<p style="font-size:13px;color:var(--muted);margin-bottom:12px">TOTP active. Enter code to disable.</p>
      <div class="modal-field"><label>Code</label><input type="text" id="mfa-code" placeholder="000000" maxlength="6" inputmode="numeric"></div>
      <button class="btn-danger" onclick="disableMFA()">Disable MFA</button>`;
  } else {
    badge.innerHTML='<span class="badge red">Disabled</span>';
    panel.innerHTML='<button class="btn-primary" onclick="beginMFASetup()">Set up Authenticator App</button>';
  }
}

async function beginMFASetup() {
  const r=await api('POST','/mfa/setup'); if(!r) return;
  document.getElementById('mfa-panel').innerHTML=`
    <p style="font-size:13px;color:var(--muted);margin-bottom:12px">Scan with your authenticator app.</p>
    <div style="text-align:center;margin-bottom:14px"><img src="${r.qr_url}" style="border-radius:8px;background:white;padding:8px"></div>
    <p style="font-size:11px;color:var(--muted);margin-bottom:12px;word-break:break-all">Key: <strong>${r.secret}</strong></p>
    <div class="modal-field"><label>Confirm code</label><input type="text" id="mfa-code" placeholder="000000" maxlength="6" inputmode="numeric"></div>
    <button class="btn-primary" onclick="confirmMFASetup()">Activate MFA</button>`;
}
async function confirmMFASetup() {
  const r=await api('POST','/mfa/confirm',{code:document.getElementById('mfa-code').value});
  if(r?.ok){toast('MFA enabled','success');renderMFAPanel();}else toast(r?.error||'Invalid code','error');
}
async function disableMFA() {
  const r=await api('POST','/mfa/disable',{code:document.getElementById('mfa-code').value});
  if(r?.ok){toast('MFA disabled','success');renderMFAPanel();}else toast(r?.error||'Invalid code','error');
}

async function loadIPRules() {
  const r = await api('GET', '/ip-rules');
  if (!r) return;
  document.getElementById('ip-rule-mode').value = r.mode || 'disabled';
  document.getElementById('ip-rule-list').value = r.ip_list || '';
  toggleIPRuleHelp();
}

function toggleIPRuleHelp() {
  const mode = document.getElementById('ip-rule-mode').value;
  const helpEl = document.getElementById('ip-rule-help');
  const listField = document.getElementById('ip-rule-list-field');
  const helps = {
    disabled: '',
    brute_skip: 'IPs in the list below will never be locked out of your account, even after many failed attempts. All other IPs are subject to global brute-force protection.',
    allow_only: '⚠ Only IPs in the list below will be able to log into your account. All other IPs will see an "Access not authorized" error. Make sure to include your current IP before saving.',
  };
  helpEl.textContent = helps[mode] || '';
  helpEl.style.display = mode !== 'disabled' ? 'block' : 'none';
  listField.style.display = mode !== 'disabled' ? 'block' : 'none';
}

async function saveIPRules() {
  const mode = document.getElementById('ip-rule-mode').value;
  const ip_list = document.getElementById('ip-rule-list').value.trim();
  if (mode !== 'disabled' && !ip_list) {
    toast('Please enter at least one IP address', 'error'); return;
  }
  const r = await api('PUT', '/ip-rules', { mode, ip_list });
  if (r?.ok) toast('IP rules saved', 'success');
  else toast(r?.error || 'Save failed', 'error');
}

async function doLogout() { await fetch('/auth/logout',{method:'POST'}); location.href='/auth/login'; }

// ── Context menu helper ────────────────────────────────────────────────────
function showCtxMenu(e, html) {
  const menu=document.getElementById('ctx-menu');
  menu.innerHTML=html; menu.classList.add('open');
  requestAnimationFrame(()=>{
    menu.style.left=Math.min(e.clientX,window.innerWidth-menu.offsetWidth-8)+'px';
    menu.style.top=Math.min(e.clientY,window.innerHeight-menu.offsetHeight-8)+'px';
  });
}

// ── Init tag fields and filter dropdown ───────────────────────────────────
// app.js loads at the bottom of <body> so the DOM is already ready here —
// we must NOT wrap in DOMContentLoaded (that event has already fired).
function _bootApp() {
  initTagField('compose-to');
  initTagField('compose-cc-tags');
  initTagField('compose-bcc-tags');

  // Filter dropdown
  const dropBtn  = document.getElementById('filter-dropdown-btn');
  const dropMenu = document.getElementById('filter-dropdown-menu');
  if (dropBtn && dropMenu) {
    dropBtn.addEventListener('click', e => {
      e.stopPropagation();
      const isOpen = dropMenu.classList.contains('open');
      dropMenu.classList.toggle('open', !isOpen);
      if (!isOpen) {
        document.addEventListener('click', () => dropMenu.classList.remove('open'), {once:true});
      }
    });
    ['default','unread','date-desc','date-asc','size-desc'].forEach(mode => {
      const el = document.getElementById('fopt-'+mode);
      if (el) el.addEventListener('click', e => { e.stopPropagation(); setFilter(mode); });
    });
  }

  init();
}

// Run immediately — DOM is ready since this script is at end of <body>
_bootApp();

// ── Real-time poller + notifications ────────────────────────────────────────
// Polls /api/poll every 20s for unread count changes and new message detection.
// When new messages arrive: updates badge instantly, shows corner toast,
// and fires a browser OS notification if permission granted.

const POLLER = {
  lastKnownID: 0,      // highest message ID we've seen
  timer: null,
  active: false,
  notifGranted: false,
};

async function startPoller() {
  // Request browser notification permission (non-blocking)
  if ('Notification' in window && Notification.permission === 'default') {
    Notification.requestPermission().then(p => {
      POLLER.notifGranted = p === 'granted';
    });
  } else if ('Notification' in window) {
    POLLER.notifGranted = Notification.permission === 'granted';
  }

  POLLER.active = true;
  schedulePoll();
}

function schedulePoll() {
  if (!POLLER.active) return;
  POLLER.timer = setTimeout(runPoll, 20000); // 20 second interval
}

async function runPoll() {
  if (!POLLER.active) return;
  try {
    const data = await api('GET', '/poll?since=' + POLLER.lastKnownID);
    if (!data) { schedulePoll(); return; }

    // Update badge immediately without full loadFolders()
    updateUnreadBadgeFromPoll(data.inbox_unread);

    // New messages arrived
    if (data.has_new && data.newest_id > POLLER.lastKnownID) {
      const prevID = POLLER.lastKnownID;
      POLLER.lastKnownID = data.newest_id;

      // Fetch new message details for notifications
      const newData = await api('GET', '/new-messages?since=' + prevID);
      const newMsgs = newData?.messages || [];

      if (newMsgs.length > 0) {
        showNewMailToast(newMsgs);
        sendOSNotification(newMsgs);
      }

      // Refresh current view if we're looking at inbox/unified
      const isInboxView = S.currentFolder === 'unified' ||
        S.folders.find(f => f.id === S.currentFolder && f.folder_type === 'inbox');
      if (isInboxView) {
        await loadMessages();
        await loadFolders();
      } else {
        await loadFolders(); // update counts in sidebar
      }
    }
  } catch(e) {
    // Network error — silent, retry next cycle
  }
  schedulePoll();
}

// Update the unread badge in the sidebar and browser tab title
// without triggering a full folder reload
function updateUnreadBadgeFromPoll(inboxUnread) {
  const badge = document.getElementById('unread-total');
  if (!badge) return;
  if (inboxUnread > 0) {
    badge.textContent = inboxUnread > 99 ? '99+' : inboxUnread;
    badge.style.display = '';
  } else {
    badge.style.display = 'none';
  }
  // Update browser tab title
  const base = 'GoWebMail';
  document.title = inboxUnread > 0 ? `(${inboxUnread}) ${base}` : base;
}

// Corner toast notification for new mail
function showNewMailToast(msgs) {
  const existing = document.getElementById('newmail-toast');
  if (existing) existing.remove();

  const count = msgs.length;
  const first = msgs[0];
  const fromLabel = first.from_name || first.from_email || 'Unknown';
  const subject = first.subject || '(no subject)';

  const text = count === 1
    ? `<strong>${escHtml(fromLabel)}</strong><br><span>${escHtml(subject)}</span>`
    : `<strong>${count} new messages</strong><br><span>${escHtml(fromLabel)}: ${escHtml(subject)}</span>`;

  const el = document.createElement('div');
  el.id = 'newmail-toast';
  el.className = 'newmail-toast';
  el.innerHTML = `
    <div class="newmail-toast-icon">✉</div>
    <div class="newmail-toast-body">${text}</div>
    <button class="newmail-toast-close" onclick="this.parentElement.remove()">✕</button>`;

  // Click to open the message
  el.addEventListener('click', (e) => {
    if (e.target.classList.contains('newmail-toast-close')) return;
    el.remove();
    if (count === 1) {
      selectFolder(
        S.folders.find(f=>f.folder_type==='inbox')?.id || 'unified',
        'Inbox'
      );
      setTimeout(()=>openMessage(first.id), 400);
    } else {
      selectFolder('unified', 'Unified Inbox');
    }
  });

  document.body.appendChild(el);

  // Auto-dismiss after 6s
  setTimeout(() => { if (el.parentElement) el.remove(); }, 6000);
}

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

// OS / browser notification
function sendOSNotification(msgs) {
  if (!POLLER.notifGranted || !('Notification' in window)) return;
  const count = msgs.length;
  const first = msgs[0];
  const title = count === 1
    ? (first.from_name || first.from_email || 'New message')
    : `${count} new messages in GoWebMail`;
  const body = count === 1
    ? (first.subject || '(no subject)')
    : `${first.from_name || first.from_email}: ${first.subject || '(no subject)'}`;

  try {
    const n = new Notification(title, {
      body,
      icon: '/static/icons/icon-192.png', // use if you have one, else falls back gracefully
      tag: 'gowebmail-new',   // replaces previous if still visible
    });
    n.onclick = () => {
      window.focus();
      n.close();
      if (count === 1) {
        selectFolder(S.folders.find(f=>f.folder_type==='inbox')?.id||'unified','Inbox');
        setTimeout(()=>openMessage(first.id), 400);
      }
    };
    // Auto-close OS notification after 8s
    setTimeout(()=>n.close(), 8000);
  } catch(e) {
    // Some browsers block even with granted permission in certain contexts
  }
}