JetCore/jetc/barant-site/assets/images/email.js

(function() {
  var app = document.getElementById('email-app');
  if (!app) return;

  // Small inline-SVG icon set for the toolbar/action buttons below -
  // stroke="currentColor" so each one just inherits its <button>'s own
  // text color (the site's gold theme, see .icon-btn in email.page's
  // own <style> block), no separate image assets or color variants to
  // keep in sync with the theme.
  var ICONS = {
    search:
      '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round">' +
      '<circle cx="11" cy="11" r="7"/>' +
      '<path d="M21 21l-4.35-4.35"/>' +
      '</svg>',
    compose:
      '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round">' +
      '<path d="M4 6h13a2 2 0 0 1 2 2v8a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2z"/>' +
      '<path d="M2.5 7.5 12 14l9.5-6.5"/>' +
      '<path d="M18.5 3.5v5M16 6h5"/>' +
      '</svg>',
    refresh:
      '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round">' +
      '<path d="M20 11a8 8 0 0 0-14.6-4.4M4 4v5h5"/>' +
      '<path d="M4 13a8 8 0 0 0 14.6 4.4M20 20v-5h-5"/>' +
      '</svg>',
    flag:
      '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round">' +
      '<path d="M5 3v18"/>' +
      '<path d="M5 4h12l-3 4.5L17 13H5"/>' +
      '</svg>',
    trash:
      '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round">' +
      '<path d="M4 7h16"/>' +
      '<path d="M9 7V4h6v3"/>' +
      '<path d="M6 7l1 13a2 2 0 0 0 2 2h6a2 2 0 0 0 2-2l1-13"/>' +
      '<path d="M10 11v6M14 11v6"/>' +
      '</svg>'
  };

  // Matches the exact, case-sensitive names the mailbox itself reports
  // via IMAP LIST (confirmed live: "Inbox", "Spam", "Trash" - only
  // INBOX is specially case-insensitive per RFC 3501, the other two
  // are not, so this has to be exact) - see email.menu's own folder
  // links, which pass these same three names to emailSelectFolder().
  var currentFolder = 'Inbox';
  var currentUid = null;
  // null = showing the normal folder listing; a non-empty string =
  // showing search results instead (see performSearch()/clearSearch()
  // and loadMessageList()'s own branch on this).
  var currentSearchQuery = null;
  // The array last handed to renderMessageList() - kept so openMessage()
  // can flip a single message's .seen flag locally and recompute the
  // toolbar's unread/total count without a round trip.
  var currentMessages = [];

  // email.menu (the site's own left-side #panelmenu, a static include
  // living outside #email-app/#content entirely - see mainpagetemplate
  // .jet's own panelmenu wiring) renders its folder links against this
  // global rather than anything scoped to this closure, since it has
  // no other way to reach into a same-page IMAP client without a full
  // page navigation (which the rest of this client deliberately avoids
  // for every other interaction too - see the module doc comment on
  // post() below... [see loadMessageList/openMessage]). Guarded with
  // `window.emailSelectFolder &&` at each call site in email.menu so a
  // click before email.js has loaded (or before a mailbox is even
  // connected) is a harmless no-op instead of a broken link.
  window.emailSelectFolder = function(folder) {
    if (!document.getElementById('email-client') || (folder === currentFolder && !currentSearchQuery))
      return;
    currentFolder = folder;
    currentUid = null;
    // A folder click always means "show me this folder, plain" - drops
    // out of search mode even if the folder didn't actually change,
    // which is exactly how a user would expect to back out of a
    // search result view.
    currentSearchQuery = null;
    var searchInput = document.getElementById('email-search-input');
    if (searchInput) searchInput.value = '';
    syncActiveFolder();
    var pane = document.getElementById('email-reading-pane');
    if (pane) pane.innerHTML = '<div id="email-empty-state">Select a message to read it.</div>';
    loadMessageList();
  };

  function syncActiveFolder() {
    var links = document.querySelectorAll('.email-folder-link');
    for (var i = 0; i < links.length; i++)
      links[i].classList.toggle('email-folder-selected', links[i].getAttribute('data-folder') === currentFolder);
  }

  function escapeHtml(s) {
    var div = document.createElement('div');
    div.textContent = s == null ? '' : String(s);
    return div.innerHTML;
  }

  function post(path, params) {
    return fetch(path, {
      method: 'POST',
      credentials: 'same-origin',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: new URLSearchParams(params || {}).toString()
    }).then(function(r) { return r.json(); });
  }

  // Matches spa.js's own delay() exactly - a separate closure here
  // since this file has no dependency on spa.js at all, not worth
  // sharing just for this.
  function delay(ms) {
    return new Promise(function(resolve) { setTimeout(resolve, ms); });
  }

  function showConnectForm(errorText) {
    app.innerHTML =
      '<div id="email-connect-form">' +
      '<h3>Connect to Mailbox</h3>' +
      '<input type="text" id="email-user-input" placeholder="you@barant.com" autocomplete="username">' +
      '<input type="password" id="email-password-input" placeholder="Password" autocomplete="current-password">' +
      '<button type="button" id="email-connect-btn">Connect</button>' +
      '<div id="email-connect-error">' + (errorText ? escapeHtml(errorText) : '') + '</div>' +
      '</div>';
    wireConnectForm();
  }

  function showClientView(userEmail) {
    app.innerHTML =
      '<div id="email-client">' +
      '<div id="email-toolbar">' +
      '<span id="email-connected-as">' + escapeHtml(userEmail) + '</span>' +
      '<span id="email-list-count"></span>' +
      '<span id="email-toolbar-actions">' +
      '<span id="email-search-box">' +
      '<input type="text" id="email-search-input" placeholder="Search mail&hellip;">' +
      '<button type="button" id="email-search-btn" class="icon-btn" title="Search">' + ICONS.search + '</button>' +
      '</span>' +
      '<button type="button" id="email-compose-btn" class="icon-btn" title="New Mail">' + ICONS.compose + '</button>' +
      '<button type="button" id="email-refresh-btn" class="icon-btn" title="Refresh">' + ICONS.refresh + '</button>' +
      '</span>' +
      '</div>' +
      '<div id="email-layout">' +
      '<div id="email-list"></div>' +
      '<div id="email-reading-pane"><div id="email-empty-state">Select a message to read it.</div></div>' +
      '</div>' +
      '</div>';
    wireClientView();
    wireAddAccountForm();
    syncActiveFolder();
    loadMessageList();
    loadAccounts();
  }

  function wireConnectForm() {
    var btn = document.getElementById('email-connect-btn');
    var userInput = document.getElementById('email-user-input');
    var passInput = document.getElementById('email-password-input');
    var errorDiv = document.getElementById('email-connect-error');

    function submit() {
      errorDiv.textContent = '';
      btn.disabled = true;
      post('/email/connect', { user: userInput.value, password: passInput.value })
        .then(function(res) {
          btn.disabled = false;
          if (res.ok) {
            showClientView(userInput.value);
          } else {
            errorDiv.textContent = res.error || 'Could not connect.';
          }
        })
        .catch(function() {
          btn.disabled = false;
          errorDiv.textContent = 'Connection request failed.';
        });
    }

    btn.addEventListener('click', submit);
    passInput.addEventListener('keydown', function(e) {
      if (e.key === 'Enter') submit();
    });
  }

  function wireClientView() {
    // Navigates via a synthetic <a> click rather than
    // window.location.href so spa.js's own document-level click
    // listener intercepts it and does its normal fade transition,
    // exactly as if a real link had been clicked.
    document.getElementById('email-compose-btn').addEventListener('click', function() {
      var a = document.createElement('a');
      a.href = '/admin/newemail';
      document.body.appendChild(a);
      a.click();
      document.body.removeChild(a);
    });
    document.getElementById('email-refresh-btn').addEventListener('click', function() {
      loadMessageList();
    });

    // Matches sender, subject, or body content in whatever folder is
    // currently open (see __imap.cpp's searchMessages()) - an empty
    // query is treated as "leave search mode" rather than sent to the
    // server as a real search, since an empty needle would otherwise
    // just match everything anyway (see __IMAP_SEARCH.cpp's own
    // containsCI()) - clearer to just fall back to the plain listing.
    function runSearch() {
      var input = document.getElementById('email-search-input');
      var query = input.value.trim();
      currentSearchQuery = query === '' ? null : query;
      currentUid = null;
      document.getElementById('email-reading-pane').innerHTML =
        '<div id="email-empty-state">Select a message to read it.</div>';
      loadMessageList();
    }
    document.getElementById('email-search-btn').addEventListener('click', runSearch);
    document.getElementById('email-search-input').addEventListener('keydown', function(e) {
      if (e.key === 'Enter')
        runSearch();
    });
  }

  function updateListCount(messages) {
    var countEl = document.getElementById('email-list-count');
    if (!countEl)
      return;
    if (!messages.length) {
      countEl.textContent = '';
      return;
    }
    var unread = 0;
    for (var i = 0; i < messages.length; i++) {
      if (!messages[i].seen)
        unread++;
    }
    countEl.textContent = '(' + unread + '/' + messages.length + ')';
  }

  function renderMessageList(messages) {
    var list = document.getElementById('email-list');
    currentMessages = messages;
    updateListCount(messages);
    if (!messages.length) {
      list.innerHTML = '<div id="email-empty-state">No messages.</div>';
      return;
    }
    var html = '';
    for (var i = 0; i < messages.length; i++) {
      var m = messages[i];
      html += '<div class="email-row' + (m.seen ? '' : ' unread') +
        (m.uid === currentUid ? ' selected' : '') + '" data-uid="' + m.uid + '">' +
        '<div class="email-row-info">' +
        '<div class="email-from">' + escapeHtml(m.from) + '</div>' +
        '<div class="email-subject">' + escapeHtml(m.subject || '(no subject)') + '</div>' +
        '<div class="email-date">' + escapeHtml(m.date) + '</div>' +
        '</div>' +
        '<button type="button" class="icon-btn email-row-trash-btn" data-uid="' + m.uid + '" title="Move to Trash">' + ICONS.trash + '</button>' +
        '</div>';
    }
    list.innerHTML = html;

    var rows = list.querySelectorAll('.email-row');
    for (var j = 0; j < rows.length; j++) {
      rows[j].addEventListener('click', function() {
        openMessage(parseInt(this.getAttribute('data-uid'), 10));
      });
    }
    // Each row's own trash button - stopPropagation so it doesn't also
    // trigger the row's own click-to-open handler just above.
    var trashBtns = list.querySelectorAll('.email-row-trash-btn');
    for (var k = 0; k < trashBtns.length; k++) {
      trashBtns[k].addEventListener('click', function(e) {
        e.stopPropagation();
        trashMessage(parseInt(this.getAttribute('data-uid'), 10));
      });
    }

    // Whatever caused this particular render (initial connect, a
    // folder switch, the refresh button with nothing open) left
    // currentUid null - open the top message rather than leave the
    // reading pane sitting empty. trashMessage() deliberately sets
    // currentUid to the row it's already decided to select BEFORE
    // reloading the list (see its own comment), specifically so this
    // check sees a real, already-correct uid and stays out of the way
    // instead of racing it to open something different.
    if (currentUid === null)
      openMessage(messages[0].uid);
  }

  // Moves a message into the Trash folder (server-side: COPY there,
  // then \Deleted+EXPUNGE from the original folder - see __imap.cpp's
  // moveMessage()) rather than permanently removing it, the same
  // "delete means trash it" convention the reading pane's own Delete
  // button (a real, permanent expunge) deliberately does NOT follow -
  // that one stays as-is; this is a separate, softer action reachable
  // straight from the list.
  // Total time the .email-row-removing CSS animation takes to finish
  // (see email.page's own <style> block) - the opacity fade runs with
  // no delay for FADE_MS, then the height/padding/margin/border
  // collapse (what actually slides the rows below it up) runs for
  // COLLAPSE_MS starting COLLAPSE_DELAY_MS in. Kept here as the single
  // source of truth for how long trashMessage() waits before swapping
  // in the server's real, post-trash list - duplicated as literal
  // numbers in the CSS transition properties themselves, since CSS has
  // no way to reference a JS constant, so keep those two in sync by
  // hand if either ever changes.
  var REMOVE_FADE_MS = 200;
  var REMOVE_COLLAPSE_DELAY_MS = 200;
  var REMOVE_COLLAPSE_MS = 220;

  // Plays the dissolve-then-collapse removal animation on one row in
  // place, resolving once it's fully finished (safe to call with a
  // null row - resolves immediately, for when the trashed uid's row
  // isn't actually in the currently-rendered list for some reason).
  function animateRowRemoval(row) {
    if (!row)
      return Promise.resolve();
    var height = row.getBoundingClientRect().height;
    row.style.height = height + 'px';
    // Forces the browser to register the explicit pixel height above
    // as a real, already-applied style before the next line changes
    // it again - without this the two height changes collapse into a
    // single layout pass and no transition plays at all.
    row.offsetHeight;
    row.classList.add('email-row-removing');
    return new Promise(function(resolve) {
      setTimeout(resolve, REMOVE_FADE_MS + REMOVE_COLLAPSE_DELAY_MS + REMOVE_COLLAPSE_MS);
    });
  }

  // Only the trashed row itself animates - every other row just stays
  // exactly where it is and shifts up as an ordinary side effect of
  // the trashed row's own height collapsing to 0 (real document-flow
  // reflow, not a separate animation applied to them). The list is
  // still reloaded from the server afterward (flags/counts could have
  // changed for reasons unrelated to this one trash action), but with
  // loadMessageList(true) - skipping ITS OWN whole-list fade, since by
  // the time it swaps in fresh markup the trashed row has already
  // visually shrunk to nothing and every other row is already sitting
  // in its final position; fading the whole list on top of that would
  // just be a second, redundant flash.
  function trashMessage(uid) {
    var rows = document.querySelectorAll('.email-row');
    var index = -1;
    var trashedRow = null;
    for (var i = 0; i < rows.length; i++) {
      if (parseInt(rows[i].getAttribute('data-uid'), 10) === uid) {
        index = i;
        trashedRow = rows[i];
        break;
      }
    }
    var nextUid = null;
    if (index !== -1) {
      if (index + 1 < rows.length)
        nextUid = parseInt(rows[index + 1].getAttribute('data-uid'), 10);
      else if (index - 1 >= 0)
        nextUid = parseInt(rows[index - 1].getAttribute('data-uid'), 10);
    }

    Promise.all([
      animateRowRemoval(trashedRow),
      post('/email/trash', { folder: currentFolder, uid: uid })
    ]).then(function() {
      // Set BEFORE the reload, not after - renderMessageList()'s own
      // auto-select-first-when-nothing's-selected check runs partway
      // through loadMessageList(true) below, and needs to already see
      // the real target here (or genuinely null, if the list is about
      // to be empty) rather than a stale null that would make it pick
      // the top row instead and race this function's own openMessage()
      // call just below.
      if (currentUid === uid)
        currentUid = nextUid;
      loadMessageList(true).then(function() {
        if (nextUid !== null)
          openMessage(nextUid);
        else
          document.getElementById('email-reading-pane').innerHTML =
            '<div id="email-empty-state">Select a message to read it.</div>';
      });
    });
  }

  // Same fade-out/fetch-concurrently/fade-in shape as openMessage() and
  // spa.js's own navigate() - every list refresh (folder switch,
  // refresh button) gets the same smooth transition instead of a flash
  // of "Loading..." text followed by an abrupt content swap. Pass
  // skipFade=true to skip that whole-list transition and just quietly
  // re-render in place - used only right after trashMessage()'s own
  // per-row removal animation has already provided the visual
  // transition, so this reload doesn't also blink the entire list.
  function loadMessageList(skipFade) {
    var list = document.getElementById('email-list');
    if (!list)
      return Promise.resolve();
    if (!skipFade)
      list.classList.add('email-fading');
    // Search results use the identical JSON shape as a normal list
    // (see __imap.cpp's shared parseSummaryLines()), so this is the
    // only place that needs to know search mode even exists -
    // renderMessageList() below has no idea which one produced what
    // it's rendering.
    var request = currentSearchQuery
      ? post('/email/search', { folder: currentFolder, query: currentSearchQuery })
      : post('/email/list', { folder: currentFolder });
    return Promise.all([
      request,
      skipFade ? true : delay(180)
    ])
      .then(function(results) {
        var res = results[0];
        if (!res.ok && res.error)
          list.innerHTML = '<div id="email-empty-state">' + escapeHtml(res.error) + '</div>';
        else
          renderMessageList(Array.isArray(res) ? res : []);
        // Every place that reloads the list (connect, folder switch,
        // refresh, post-trash) is a place the unseen counts next to
        // each folder name could plausibly have changed too - one
        // hook here covers all of them rather than needing a separate
        // call at each individual call site.
        loadFolderCounts();
        if (!skipFade)
          list.classList.remove('email-fading');
      })
      .catch(function() {
        list.innerHTML = '<div id="email-empty-state">Could not load messages.</div>';
        if (!skipFade)
          list.classList.remove('email-fading');
      });
  }

  // Populates the unread-count badge next to each folder name in
  // email.menu's own static markup (a real DOM lookup by
  // data-folder-count, not anything rendered by this file - email.menu
  // is a separate include living in #panelmenu, outside #content
  // entirely). Uses IMAP STATUS server-side (see __imap.cpp's
  // folderCounts()), not a real FETCH, so this is cheap enough to call
  // on every list reload without it being a heavy extra round trip.
  // Silently does nothing on error - a stale/missing count badge is a
  // cosmetic problem, not worth surfacing as a user-visible failure.
  function loadFolderCounts() {
    post('/email/folders', {}).then(function(res) {
      if (res.error)
        return;
      var folders = ['Inbox', 'Spam', 'Trash'];
      for (var i = 0; i < folders.length; i++) {
        var f = folders[i];
        var span = document.querySelector('.email-folder-count[data-folder-count="' + f + '"]');
        if (span && res[f])
          span.textContent = res[f].messages > 0 ? (res[f].unseen + '/' + res[f].messages) : '';
      }
    }).catch(function() {});
  }

  function loadAccounts() {
    post('/email/accounts', {}).then(function(res) {
      var list = document.getElementById('email-account-list');
      if (!list || !res.accounts)
        return;
      var html = '';
      for (var i = 0; i < res.accounts.length; i++) {
        var user = res.accounts[i];
        html += '<a href="javascript:void(0);" class="email-account-link' +
          (user === res.active ? ' email-account-selected' : '') + '" data-user="' +
          escapeHtml(user) + '">' + escapeHtml(user) + '</a>';
      }
      list.innerHTML = html;
      var links = list.querySelectorAll('.email-account-link');
      for (var j = 0; j < links.length; j++) {
        links[j].addEventListener('click', function() {
          var user = this.getAttribute('data-user');
          if (!this.classList.contains('email-account-selected'))
            switchAccount(user);
        });
      }
    }).catch(function() {});
  }

  // Shared by switchAccount() and the add-account form's own success
  // path (which is already connected/active server-side by the time
  // /email/connect returns ok - no reason to also round-trip through
  // switchaccount right after) - resets the view to a fresh Inbox for
  // whichever account just became active, same as a brand new connect.
  function resetViewForActiveAccount(user) {
    currentFolder = 'Inbox';
    currentUid = null;
    currentSearchQuery = null;
    var searchInput = document.getElementById('email-search-input');
    if (searchInput) searchInput.value = '';
    var connectedAs = document.getElementById('email-connected-as');
    if (connectedAs) connectedAs.textContent = user;
    syncActiveFolder();
    var pane = document.getElementById('email-reading-pane');
    if (pane) pane.innerHTML = '<div id="email-empty-state">Select a message to read it.</div>';
    loadMessageList();
    loadAccounts();
  }

  function switchAccount(user) {
    post('/email/switchaccount', { user: user }).then(function(res) {
      if (res.ok)
        resetViewForActiveAccount(user);
    }).catch(function() {});
  }

  window.emailShowAddAccount = function() {
    var form = document.getElementById('email-add-account-form');
    var link = document.getElementById('email-add-account-link');
    if (!form)
      return;
    form.style.display = 'flex';
    if (link) link.style.display = 'none';
    var userInput = document.getElementById('email-add-account-user');
    if (userInput) userInput.focus();
  };

  function wireAddAccountForm() {
    var btn = document.getElementById('email-add-account-btn');
    var userInput = document.getElementById('email-add-account-user');
    var passInput = document.getElementById('email-add-account-password');
    var errorDiv = document.getElementById('email-add-account-error');
    if (!btn)
      return;

    function submit() {
      errorDiv.textContent = '';
      btn.disabled = true;
      post('/email/connect', { user: userInput.value, password: passInput.value })
        .then(function(res) {
          btn.disabled = false;
          if (!res.ok) {
            errorDiv.textContent = res.error || 'Could not connect.';
            return;
          }
          var newUser = userInput.value;
          userInput.value = '';
          passInput.value = '';
          document.getElementById('email-add-account-form').style.display = 'none';
          document.getElementById('email-add-account-link').style.display = 'block';
          resetViewForActiveAccount(newUser);
        })
        .catch(function() {
          btn.disabled = false;
          errorDiv.textContent = 'Connection request failed.';
        });
    }

    btn.addEventListener('click', submit);
    passInput.addEventListener('keydown', function(e) {
      if (e.key === 'Enter') submit();
    });
  }

  function renderMessage(msg) {
    var pane = document.getElementById('email-reading-pane');
    pane.innerHTML =
      '<div class="email-header">' +
      '<div><b>From:</b> ' + escapeHtml(msg.from) + '</div>' +
      '<div><b>To:</b> ' + escapeHtml(msg.to) + '</div>' +
      '<div><b>Subject:</b> ' + escapeHtml(msg.subject || '(no subject)') + '</div>' +
      '<div><b>Date:</b> ' + escapeHtml(msg.date) + '</div>' +
      '</div>' +
      '<div class="email-body-container"></div>' +
      '<div class="email-actions">' +
      '<button type="button" id="email-flag-btn" class="icon-btn' + (msg.flagged ? ' icon-btn-active' : '') +
        '" title="' + (msg.flagged ? 'Unflag' : 'Flag') + '">' + ICONS.flag + '</button>' +
      '<button type="button" id="email-delete-btn" class="icon-btn" title="Delete">' + ICONS.trash + '</button>' +
      '</div>';

    // HTML-formatted mail renders in a sandboxed iframe, never via
    // innerHTML into this page directly - the body content is whatever
    // a third party sent, and this page runs as the logged-in user
    // with real session cookies. `allow-same-origin` alone (no
    // `allow-scripts`, no `allow-forms`, no `allow-popups`, no
    // `allow-top-navigation`) still blocks every dangerous thing
    // untrusted HTML could do - scripts simply do not run without
    // allow-scripts, full stop, regardless of same-origin access - it
    // ONLY additionally lets THIS PAGE read the iframe's own rendered
    // content height back out (contentDocument), which the very first,
    // fully-opaque `sandbox=""` version couldn't do at all. That's
    // needed to size the iframe to its actual content below, rather
    // than a fixed height with its own internal scrollbar sitting
    // inside the reading pane's own scrollbar - two nested scrollbars
    // for one piece of content, confusing regardless of how tall the
    // fixed box happened to be. Building it via createElement + the
    // .srcdoc PROPERTY (not a string-concatenated HTML attribute)
    // sidesteps any need to hand-escape the content for attribute-
    // safety - the DOM API does that correctly on its own. Plain-text
    // mail keeps using .textContent, same reasoning.
    var bodyContainer = pane.querySelector('.email-body-container');
    if (msg.isHtml) {
      var frame = document.createElement('iframe');
      frame.className = 'email-body-frame';
      frame.setAttribute('sandbox', 'allow-same-origin');
      frame.setAttribute('scrolling', 'no');
      frame.addEventListener('load', function() {
        try {
          var doc = frame.contentDocument;
          if (doc && doc.documentElement)
            frame.style.height = Math.max(doc.documentElement.scrollHeight, doc.body.scrollHeight) + 'px';
        } catch (e) {
          // Left at its CSS fallback height - still shows the content,
          // just with its own scrollbar if that fallback runs short.
        }
      });
      frame.srcdoc = msg.body;
      bodyContainer.appendChild(frame);
    } else {
      var textDiv = document.createElement('div');
      textDiv.className = 'email-body';
      textDiv.textContent = msg.body;
      bodyContainer.appendChild(textDiv);
    }

    document.getElementById('email-flag-btn').addEventListener('click', function() {
      post('/email/flag', {
        folder: currentFolder,
        uid: msg.uid,
        flag: '\\Flagged',
        set: msg.flagged ? 'no' : 'yes'
      }).then(function() {
        loadMessageList();
        openMessage(msg.uid);
      });
    });

    document.getElementById('email-delete-btn').addEventListener('click', function() {
      if (!window.confirm('Delete this message?')) return;
      post('/email/delete', { folder: currentFolder, uid: msg.uid }).then(function() {
        currentUid = null;
        document.getElementById('email-reading-pane').innerHTML =
          '<div id="email-empty-state">Select a message to read it.</div>';
        loadMessageList();
      });
    });
  }

  // Opening a message is the reading pane's own concern - it fetches
  // and renders itself via /email/message and nothing else. It used to
  // also call loadMessageList() afterward (re-fetching and
  // re-rendering the ENTIRE list, every single time a message was
  // opened) just to pick up the \Seen flag the server already set as a
  // side effect of fetching the body - that's a locally-known update
  // (we know which uid was just opened), applied straight to the
  // already-rendered row below instead of paying for a second full
  // round trip and list re-render on every click.
  function openMessage(uid) {
    currentUid = uid;
    var pane = document.getElementById('email-reading-pane');
    var rows = document.querySelectorAll('.email-row');
    var wasUnread = false;
    for (var i = 0; i < rows.length; i++) {
      var isTarget = parseInt(rows[i].getAttribute('data-uid'), 10) === uid;
      rows[i].classList.toggle('selected', isTarget);
      if (isTarget) {
        wasUnread = rows[i].classList.contains('unread');
        // Marked read the instant it's selected, not after the fetch
        // resolves - fetchMessage() marks it \Seen server-side anyway
        // (BODY[] rather than BODY.PEEK[]), so there's nothing
        // optimistic about this beyond removing the visual lag.
        rows[i].classList.remove('unread');
      }
    }
    if (wasUnread) {
      for (var k = 0; k < currentMessages.length; k++) {
        if (currentMessages[k].uid === uid)
          currentMessages[k].seen = true;
      }
      updateListCount(currentMessages);
      loadFolderCounts();
    }

    // Same fade-out/fetch-concurrently/fade-in shape as spa.js's own
    // navigate() - a minimum-duration fade (via delay()) runs alongside
    // the fetch rather than after it, so a fast response still shows
    // the full transition instead of a flash, and a slow one doesn't
    // wait any longer than the fetch itself already takes.
    pane.classList.add('email-fading');
    Promise.all([
      post('/email/message', { folder: currentFolder, uid: uid }),
      delay(180)
    ])
      .then(function(results) {
        var res = results[0];
        if (!res.ok && res.error) {
          pane.innerHTML = '<div id="email-empty-state">' + escapeHtml(res.error) + '</div>';
        } else {
          renderMessage(res);
        }
        pane.classList.remove('email-fading');
      })
      .catch(function() {
        pane.innerHTML = '<div id="email-empty-state">Could not load message.</div>';
        pane.classList.remove('email-fading');
      });
  }

  // Up/Down moves through the message list and opens whatever it
  // lands on - registered once, unconditionally, at load time (same
  // always-on-but-internally-guarded shape as spa.js's own document-
  // level click listener) rather than added/removed each time the
  // client view is (re)shown, so reconnecting never stacks up
  // duplicate handlers. Bails out immediately whenever the client
  // view isn't actually showing (the connect form has no .email-row
  // elements at all) or the keystroke is really meant for a form
  // field (a future compose/search input, say) rather than list
  // navigation.
  document.addEventListener('keydown', function(e) {
    var active = document.activeElement;
    if (active && (active.tagName === 'INPUT' || active.tagName === 'TEXTAREA'))
      return;

    // Delete trashes whichever message is currently open, the same
    // action (and the same dissolve-and-slide-up animation) as
    // clicking that row's own trash button - see trashMessage().
    if (e.key === 'Delete') {
      if (!document.getElementById('email-client') || currentUid === null)
        return;
      e.preventDefault();
      trashMessage(currentUid);
      return;
    }

    if (e.key !== 'ArrowDown' && e.key !== 'ArrowUp')
      return;
    var rows = document.querySelectorAll('.email-row');
    if (!rows.length)
      return;
    e.preventDefault();

    var index = -1;
    for (var i = 0; i < rows.length; i++) {
      if (parseInt(rows[i].getAttribute('data-uid'), 10) === currentUid) {
        index = i;
        break;
      }
    }
    if (e.key === 'ArrowDown')
      index = (index === -1) ? 0 : Math.min(index + 1, rows.length - 1);
    else
      index = (index === -1) ? 0 : Math.max(index - 1, 0);

    rows[index].scrollIntoView({ block: 'nearest' });
    openMessage(parseInt(rows[index].getAttribute('data-uid'), 10));
  });

  if (document.getElementById('email-connect-form')) {
    wireConnectForm();
  } else if (document.getElementById('email-client')) {
    wireClientView();
    wireAddAccountForm();
    syncActiveFolder();
    loadMessageList();
    loadAccounts();
  }
})();