MediaWiki:Gadget-GrAnnotations.js: Difference between revisions

Revision as of 11:29, 26 April 2026

/**
 * gr_annotations.js  —  grantha.io inline Comments + Bookmarks
 * ══════════════════════════════════════════════════════════════════════
 *
 * BEHAVIOUR (mirrors Google Docs)
 * ────────────────────────────────
 * 1. User selects text anywhere in mw-content-text.
 * 2. A floating action strip (FAB) appears to the right of the selection
 *    with two icon buttons: Comment and Bookmark.
 * 3. Clicking Comment:
 *    - Opens an inline composer card anchored to the selection position.
 *    - On submit: wraps the selected text in a yellow highlight span,
 *      saves the comment to Talk:<PageTitle>/GrComments via MW edit API,
 *      sends email notification to admin,
 *      and adds a card to the Comments tab of the right panel.
 *    - Each comment card has a delete (×) button (logged-in users only).
 *    - On delete: removes from wiki page, localStorage anchor, and DOM;
 *      sends a deletion notification email to admin.
 * 4. Clicking Bookmark:
 *    - Opens a small composer to name the bookmark.
 *    - On submit: wraps selected text in a blue highlight span,
 *      saves bookmark in localStorage (per-user, per-page),
 *      and adds a card to the Bookmarks tab.
 *    - Bookmark stores quote + quoteIndex (nth occurrence) so restore
 *      after page refresh lands on the correct match even when the same
 *      text appears multiple times on the page (e.g. Sanskrit verses).
 *    - Clicking a bookmark card scrolls to and flashes that highlight.
 * 5. Right panel:
 *    - Slides in from the right as an overlay (no layout shift).
 *    - Tab 1: Comments  (loads from Talk:/GrComments wiki page)
 *    - Tab 2: Bookmarks (loads from localStorage)
 *    - Panel can be closed via ✕ or clicking the backdrop.
 * 6. Clicking any comment/bookmark highlight in the text:
 *    - Opens the panel to the correct tab and scrolls to the card.
 *
 * STORAGE
 * ───────
 * Comments  → MediaWiki page: Talk:<PageTitle>/GrComments
 *             Format: {{GrComment|id=…|author=…|timestamp=…|quote=…|text=…}}
 * Bookmarks → localStorage  Key: grantha_bm_<pageName>
 *             Each entry includes quoteIndex (0-based nth occurrence).
 * Highlight anchors → localStorage  Key: grantha_cmt_<pageName>
 *             Stores {id, quote, quoteIndex} for comment highlight restore.
 *
 * ADMIN NOTIFICATION
 * ──────────────────
 * On new comment AND on comment delete: sends email via MW EmailUser API.
 * Fallback: posts to User_talk:ADMIN_USER for Echo notification.
 * Requires $wgEnableEmail = true and $wgEnableUserEmail = true (MW defaults).
 *
 * DEPENDENCIES
 * ────────────
 * • jQuery (loaded by MediaWiki)
 * • mw.Api  (MediaWiki core)
 * • gr_annotations.css  (companion stylesheet)
 * ══════════════════════════════════════════════════════════════════════
 */

/* global mw, $ */
( function () {
  'use strict';

  // ── Configuration ────────────────────────────────────────────────────
  var ADMIN_USER  = 'GranthaGate';
  var CONTENT_SEL = '#mw-content-text';
  var BM_LS_KEY   = 'grantha_bm_'  + ( ( window.mw && mw.config.get( 'wgPageName' ) ) || '' );
  var CMT_LS_KEY  = 'grantha_cmt_' + ( ( window.mw && mw.config.get( 'wgPageName' ) ) || '' );
  var pageTitle   = ( window.mw && mw.config.get( 'wgPageName' ) ) || '';
  var commentsPage = 'Talk:' + pageTitle + '/GrComments';
  var currentUser  = ( window.mw && mw.config.get( 'wgUserName' ) ) || '';
  var userInitial  = currentUser ? currentUser.charAt( 0 ).toUpperCase() : '?';

  // Only run on content namespaces
  if ( window.mw ) {
    var ns = mw.config.get( 'wgNamespaceNumber' );
    if ( ns < 0 ) return;
    if ( /\/Comments$/.test( pageTitle ) ) return;
  }

  // ── State ────────────────────────────────────────────────────────────
  var _selRange   = null;
  var _selText    = '';
  var _selRect    = null;
  var _comments   = [];
  var _bookmarks  = [];
  var _cmtLoaded  = false;
  var _activeTab  = 'comments';

  // ── Helpers ──────────────────────────────────────────────────────────
  function uid() {
    return 'gra_' + Date.now() + '_' + Math.random().toString(36).slice(2,7);
  }
  function esc( s ) {
    return String( s || '' )
      .replace(/&/g,'&amp;').replace(/</g,'&lt;')
      .replace(/>/g,'&gt;').replace(/"/g,'&quot;');
  }
  function nowIso() {
    return new Date().toISOString().replace(/\.\d{3}Z$/,'Z');
  }
  function fmtTs( ts ) {
    try {
      var d = new Date( ts );
      return d.toLocaleDateString('en-IN',{day:'numeric',month:'short',year:'numeric'})
           + ' ' + d.toLocaleTimeString('en-IN',{hour:'2-digit',minute:'2-digit',hour12:false});
    } catch(e){ return ts; }
  }
  function clamp( val, min, max ) { return Math.max(min, Math.min(max, val)); }

  // ── DOM references (populated in buildDom) ───────────────────────────
  var $fab, $panel, $backdrop, $panelBody;
  var $cmpComposer, $cmpInput, $cmpSubmit;
  var $bmComposer, $bmInput, $bmSubmit;
  var $tabComments, $tabBookmarks;
  var $paneComments, $paneBookmarks;

  // ════════════════════════════════════════════════════════════════════
  // DOM BUILDER
  // ════════════════════════════════════════════════════════════════════

  function buildDom() {

    // ── Floating action strip ────────────────────────────────────────
    $fab = $( [
      '<div id="gra-fab">',
      '  <button class="gra-fab-btn" id="gra-fab-comment" type="button">',
      '    <span class="gra-icon gra-icon-comment"></span>',
      '    <span class="gra-fab-tooltip">Add comment</span>',
      '  </button>',
      '  <button class="gra-fab-btn" id="gra-fab-bookmark" type="button">',
      '    <span class="gra-icon gra-icon-bookmark"></span>',
      '    <span class="gra-fab-tooltip">Bookmark</span>',
      '  </button>',
      '</div>',
    ].join('') );
    $( 'body' ).append( $fab );

    // ── Comment composer card ────────────────────────────────────────
    $cmpComposer = $( [
      '<div class="gra-composer" id="gra-cmp-composer">',
      '  <div class="gra-composer-user">',
      '    <div class="gra-avatar" id="gra-cmp-avatar">' + esc(userInitial) + '</div>',
      '    <div class="gra-composer-name" id="gra-cmp-name">' + esc(currentUser || 'Anonymous') + '</div>',
      '  </div>',
      '  <textarea class="gra-composer-input" id="gra-cmp-input"',
      '    placeholder="Comment or add others with @…" rows="3"></textarea>',
      '  <div class="gra-composer-actions">',
      '    <button class="gra-btn-cancel" id="gra-cmp-cancel">Cancel</button>',
      '    <button class="gra-btn-submit" id="gra-cmp-submit" disabled>Comment</button>',
      '  </div>',
      '</div>',
    ].join('') );
    $( 'body' ).append( $cmpComposer );

    // ── Bookmark composer card ────────────────────────────────────────
    $bmComposer = $( [
      '<div class="gra-bm-composer" id="gra-bm-composer">',
      '  <div class="gra-bm-composer-label">',
      '    <span class="gra-icon gra-icon-bookmark"></span>',
      '    Save bookmark',
      '  </div>',
      '  <input class="gra-composer-input" id="gra-bm-input"',
      '    type="text" placeholder="Bookmark name…" autocomplete="off">',
      '  <div class="gra-composer-actions">',
      '    <button class="gra-btn-cancel" id="gra-bm-cancel">Cancel</button>',
      '    <button class="gra-btn-submit" id="gra-bm-submit">Save</button>',
      '  </div>',
      '</div>',
    ].join('') );
    $( 'body' ).append( $bmComposer );

    // ── Right panel ───────────────────────────────────────────────────
    $panel = $( [
      '<div id="gra-panel">',
      '  <div id="gra-panel-head">',
      '    <div></div>',
      '    <button id="gra-panel-close" title="Close panel">✕</button>',
      '  </div>',
      '  <div id="gra-tabs">',
      '    <button class="gra-tab gra-tab-active" id="gra-tab-comments">',
      '      <span class="gra-icon gra-icon-comment"></span> Comments',
      '    </button>',
      '    <button class="gra-tab" id="gra-tab-bookmarks">',
      '      <span class="gra-icon gra-icon-bookmark"></span> Bookmarks',
      '    </button>',
      '  </div>',
      '  <div id="gra-panel-body">',
      '    <div class="gra-pane gra-pane-active" id="gra-pane-comments"></div>',
      '    <div class="gra-pane"              id="gra-pane-bookmarks"></div>',
      '  </div>',
      '</div>',
    ].join('') );
    $( 'body' ).append( $panel );

    $backdrop = $('<div id="gra-backdrop"></div>');
    $( 'body' ).append( $backdrop );

    var $toggle = $( [
      '<button id="gra-toggle" title="Comments &amp; Bookmarks">',
      '  <span class="gra-icon gra-icon-comment" id="gra-toggle-icon"></span>',
      '  <span id="gra-toggle-badge"></span>',
      '</button>',
    ].join('') );
    $( 'body' ).append( $toggle );
    $toggle.on( 'click', function() {
      if ( $panel.hasClass('gra-panel-open') ) { closePanel(); }
      else { openPanel( _activeTab ); }
    } );

    $panelBody    = $( '#gra-panel-body' );
    $( '#gra-panel-head div' ).first()
      .text( pageTitle.replace(/_/g,' ').split('/')[0].slice(0,30) )
      .css({ 'font-size':'13px', 'font-weight':'600', 'color':'#5a3a00' });
    $tabComments  = $( '#gra-tab-comments' );
    $tabBookmarks = $( '#gra-tab-bookmarks' );
    $paneComments = $( '#gra-pane-comments' );
    $paneBookmarks= $( '#gra-pane-bookmarks' );
    $cmpInput     = $( '#gra-cmp-input' );
    $cmpSubmit    = $( '#gra-cmp-submit' );
    $bmInput      = $( '#gra-bm-input' );
    $bmSubmit     = $( '#gra-bm-submit' );

    if ( !currentUser ) {
      $cmpSubmit.prop( 'disabled', true );
      $cmpComposer.find( '.gra-composer-actions' )
        .prepend( '<a href="' + esc( mw ? mw.util.getUrl('Special:UserLogin') : '/wiki/Special:UserLogin' ) +
                  '" style="font-size:11px;color:#999;margin-right:auto">Log in to comment</a>' );
    }
  }

  // ════════════════════════════════════════════════════════════════════
  // FAB — position & show/hide
  // ════════════════════════════════════════════════════════════════════

  function showFab( rect ) {
    if ( !rect ) return;
    var fabW = 46, fabH = 84;
    var top  = rect.top + ( rect.height / 2 ) - ( fabH / 2 );
    var left = rect.right + 10;
    if ( left + fabW > window.innerWidth - 8 ) { left = rect.left - fabW - 10; }
    top  = clamp( top,  8, window.innerHeight - fabH - 8 );
    left = clamp( left, 8, window.innerWidth  - fabW - 8 );
    $fab.css({ top: top + 'px', left: left + 'px' }).addClass('gra-fab-visible');
  }

  function hideFab() { $fab.removeClass('gra-fab-visible'); }

  // ════════════════════════════════════════════════════════════════════
  // SELECTION HANDLING
  // ════════════════════════════════════════════════════════════════════

  function captureSelection() {
    var sel = window.getSelection();
    if ( !sel || sel.isCollapsed || !sel.rangeCount ) return false;
    var range   = sel.getRangeAt(0);
    var text    = sel.toString().trim();
    if ( !text || text.length < 2 ) return false;
    var contentEl = document.querySelector( CONTENT_SEL );
    if ( !contentEl ) return false;
    var startEl = range.commonAncestorContainer;
    if ( startEl.nodeType === 3 ) startEl = startEl.parentNode;
    if ( !contentEl.contains( startEl ) ) return false;
    _selText  = text;
    _selRange = range.cloneRange();
    _selRect  = range.getBoundingClientRect();
    return true;
  }

  // ════════════════════════════════════════════════════════════════════
  // COMPOSER POSITIONING
  // ════════════════════════════════════════════════════════════════════

  function positionComposer( $el ) {
    if ( !_selRect ) return;
    var top  = _selRect.bottom + 8;
    var left = _selRect.left;
    var composerW = 308;
    if ( left + composerW > window.innerWidth - 8 ) { left = window.innerWidth - composerW - 8; }
    left = Math.max( left, 8 );
    if ( top + 160 > window.innerHeight ) { top = _selRect.top - 170; }
    top = Math.max( top, 8 );
    $el.css({ top: top + 'px', left: left + 'px' });
  }

  // ════════════════════════════════════════════════════════════════════
  // WRAP SELECTION IN HIGHLIGHT SPAN
  // ════════════════════════════════════════════════════════════════════

  function wrapSelection( id, cssClass ) {
    if ( !_selRange ) return null;
    // Capture into local var and null out _selRange immediately so
    // surroundContents() mutation cannot corrupt future selections.
    var range = _selRange;
    _selRange = null;
    try {
      var span = document.createElement('span');
      span.className = cssClass;
      span.setAttribute('data-gra-id', id);
      range.surroundContents( span );
      return span;
    } catch ( e ) {
      try {
        var frag  = range.extractContents();
        var span2 = document.createElement('span');
        span2.className = cssClass;
        span2.setAttribute('data-gra-id', id);
        span2.appendChild( frag );
        range.insertNode( span2 );
        return span2;
      } catch(e2) { return null; }
    }
  }

  // ════════════════════════════════════════════════════════════════════
  // OCCURRENCE INDEX
  // Returns the 0-based count of how many times needle appears in the
  // page text *before* the start of savedRange. This tells us which
  // occurrence was selected so we can restore the highlight accurately.
  // Must be called BEFORE wrapSelection() nulls out _selRange.
  // ════════════════════════════════════════════════════════════════════

  function computeQuoteIndex( needle, savedRange ) {
    if ( !savedRange || !needle ) return 0;
    var contentEl = document.querySelector( CONTENT_SEL );
    if ( !contentEl ) return 0;
    try {
      var preRange = document.createRange();
      preRange.setStart( contentEl, 0 );
      preRange.setEnd( savedRange.startContainer, savedRange.startOffset );
      var textBefore = preRange.toString();
      var count = 0, idx = 0;
      while ( ( idx = textBefore.indexOf( needle, idx ) ) !== -1 ) {
        count++;
        idx += needle.length;
      }
      return count; // 0 = first occurrence
    } catch(e) { return 0; }
  }

  // ════════════════════════════════════════════════════════════════════
  // COMMENT FLOW
  // ════════════════════════════════════════════════════════════════════

  function openCommentComposer() {
    hideFab();
    positionComposer( $cmpComposer );
    $cmpComposer.addClass('gra-composer-visible');
    $cmpInput.val('').focus();
  }

  function closeCommentComposer() {
    $cmpComposer.removeClass('gra-composer-visible');
    $cmpInput.val('');
    $cmpSubmit.prop('disabled', true);
    _selRange = null;
    _selText  = '';
    _selRect  = null;
  }

  function submitComment() {
    var text  = $cmpInput.val().trim();
    if ( !text || !currentUser ) return;
    var id    = uid();
    var ts    = nowIso();
    var quote = _selText.slice(0, 120) + ( _selText.length > 120 ? '…' : '' );

    // Compute occurrence index BEFORE wrapSelection nulls _selRange
    var needle     = _selText.replace(/…$/, '').trim().slice(0, 80);
    var quoteIndex = computeQuoteIndex( needle, _selRange );

    var span = wrapSelection( id, 'gra-comment-highlight' );
    if ( span ) span.setAttribute('data-gra-quote', quote);

    var entry = { id:id, author:currentUser, ts:ts, quote:quote, text:text };
    _comments.push( entry );
    persistCommentHighlight( id, quote, quoteIndex );

    saveCommentToWiki( id, quote, text, ts );
    notifyAdmin( 'add', id, quote, text, ts );

    renderCommentCards();
    closeCommentComposer();
    openPanel('comments');
  }

  // ── Delete comment ───────────────────────────────────────────────────
  function deleteComment( id ) {
    var entry = null;
    _comments = _comments.filter(function(c){
      if ( c.id === id ) { entry = c; return false; }
      return true;
    });

    // Remove highlight span from DOM
    var span = document.querySelector('[data-gra-id="' + id + '"].gra-comment-highlight');
    if ( span ) {
      var parent = span.parentNode;
      while ( span.firstChild ) parent.insertBefore( span.firstChild, span );
      parent.removeChild( span );
    }

    removeCommentHighlight( id );
    deleteCommentFromWiki( id );

    if ( entry ) {
      notifyAdmin( 'delete', id, entry.quote, entry.text, nowIso() );
    }

    renderCommentCards();
  }

  function deleteCommentFromWiki( id ) {
    if ( !window.mw ) return;
    var api = new mw.Api();
    api.get({
      action:'query', prop:'revisions', titles:commentsPage,
      rvprop:'content', rvslots:'main', formatversion:2,
    }).then(function(data){
      var page = (data.query.pages||[])[0]||{};
      var existing = '';
      if ( page.revisions && page.revisions[0] ) {
        var rev = page.revisions[0];
        existing = rev.slots ? rev.slots.main.content : rev['*'] || '';
      }
      if ( !existing ) return;
      // Remove the {{GrComment…}} block whose id field matches
      var re = new RegExp(
        '\\{\\{GrComment\\s*\\n(?:[^}]|\\}(?!\\}))*?\\|\\s*id\\s*=\\s*' +
        id.replace(/[.*+?^${}()|[\]\\]/g,'\\$&') +
        '[\\s\\S]*?\\}\\}\\n?', 'g'
      );
      var updated = existing.replace( re, '' ).replace(/\n{3,}/g, '\n\n').trim();
      api.postWithEditToken({
        action:'edit', title:commentsPage, text:updated,
        summary:'Deleted comment ' + id + ' by ' + currentUser + ' on [[' + pageTitle + ']]',
        bot:0,
      }).catch(function(){});
    }).catch(function(){});
  }

  function saveCommentToWiki( id, quote, text, ts ) {
    if ( !window.mw ) return;
    var api = new mw.Api();
    api.get({
      action:'query', prop:'revisions', titles:commentsPage,
      rvprop:'content', rvslots:'main', formatversion:2,
    }).then(function(data){
      var page = (data.query.pages||[])[0]||{};
      var existing = '';
      if ( page.revisions && page.revisions[0] ) {
        var rev = page.revisions[0];
        existing = rev.slots ? rev.slots.main.content : rev['*'] || '';
      }
      var entry = '{{GrComment\n'
                + '| id        = ' + id          + '\n'
                + '| author    = ' + currentUser + '\n'
                + '| timestamp = ' + ts          + '\n'
                + '| quote     = ' + quote.replace(/\n/g,' ') + '\n'
                + '| text      = ' + text.replace(/\n/g,' ')  + '\n'
                + '}}\n';
      var updated = (existing.trim() ? existing.trim() + '\n\n' : '') + entry;
      api.postWithEditToken({
        action:'edit', title:commentsPage, text:updated,
        summary:'New comment by ' + currentUser + ' on [[' + pageTitle + ']] (stored off-page)',
        bot:0,
      }).catch(function(){});
    }).catch(function(){});
  }

  // ── Admin notification (add AND delete) ──────────────────────────────
  function notifyAdmin( action, anchorId, quote, commentText, ts ) {
    if ( !window.mw || !ADMIN_USER ) return;

    var articlePath = ( mw.config.get('wgArticlePath') || '/wiki/$1' ).replace( '$1', pageTitle );
    var anchorLink  = window.location.origin + articlePath + ( anchorId ? '#' + anchorId : '' );
    var pageDisplay = pageTitle.replace( /_/g, ' ' );
    var isDelete    = ( action === 'delete' );

    var subject = isDelete
      ? '[Grantha] Comment deleted on "' + pageDisplay + '"'
      : '[Grantha] New comment on "'     + pageDisplay + '"';

    var body = ( isDelete ? 'A comment was DELETED on ' : 'A new comment was posted on ' )
             + pageDisplay + '.\n\n'
             + ( isDelete ? 'Deleted by : ' : 'Posted by  : ' )
             + ( currentUser || 'Anonymous' ) + '\n'
             + 'Time       : ' + ts + '\n'
             + 'Passage    : "' + quote + '"\n\n'
             + 'Comment    :\n' + commentText + '\n\n'
             + '\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\n'
             + 'Jump to passage:\n' + anchorLink + '\n\n'
             + 'View all comments:\n'
             + window.location.origin
             + ( mw.config.get('wgArticlePath') || '/wiki/$1' )
                 .replace( '$1', 'Talk:' + pageTitle + '/GrComments' )
             + '\n';

    new mw.Api().post({
      action:  'emailuser',
      target:  ADMIN_USER,
      subject: subject,
      text:    body,
      token:   mw.user.tokens.get( 'csrfToken' ),
    }).catch(function(){
      /* Fallback: post to admin talk page for Echo notification */
      if ( !currentUser ) return;
      var verb    = isDelete ? 'deleted' : 'posted';
      var wikimsg = '== Comment ' + verb + ' on [[' + pageDisplay + ']] ==\n'
                  + '; By: ' + ( currentUser || 'Anonymous' ) + '\n'
                  + '; Passage: //' + quote + '//\n'
                  + '; Link: ' + anchorLink + '\n\n'
                  + commentText.slice(0,500)
                  + ( commentText.length > 500 ? '\n…' : '' )
                  + '\n\n--[[User:Chandrashekars|Chandrashekars]] ([[User talk:Chandrashekars|talk]]) 11:29, 26 April 2026 (UTC)';
      new mw.Api().postWithEditToken({
        action:'edit', title:'User_talk:' + ADMIN_USER, section:'new',
        sectiontitle: ( isDelete ? 'Comment deleted on ' : 'Comment on ' ) + pageDisplay,
        text:wikimsg,
        summary:'Comment notification from [[' + pageDisplay + ']]',
        bot:0,
      }).catch(function(){});
    });
  }

  // ── Load comments from wiki ───────────────────────────────────────────
  function loadComments( cb ) {
    if ( _cmtLoaded ) { if (cb) cb(); return; }
    if ( !window.mw ) { _cmtLoaded=true; if(cb)cb(); return; }
    new mw.Api().get({
      action:'query', prop:'revisions', titles:commentsPage,
      rvprop:'content', rvslots:'main', formatversion:2,
    }).then(function(data){
      var page = (data.query.pages||[])[0]||{};
      var wt = '';
      if ( page.revisions && page.revisions[0] ) {
        var rev = page.revisions[0];
        wt = rev.slots ? rev.slots.main.content : rev['*'] || '';
      }
      _comments  = parseCommentsWt(wt);
      _cmtLoaded = true;
      if (cb) cb();
    }).catch(function(){ _cmtLoaded=true; if(cb)cb(); });
  }

  function parseCommentsWt( wt ) {
    var out = [];
    var re  = /\{\{GrComment\s*\n([\s\S]*?)\}\}/g;
    var m;
    while ( (m = re.exec(wt)) !== null ) {
      var block = m[1];
      var f     = {};
      var lr    = /\|\s*([\w_]+)\s*=\s*([\s\S]*?)(?=\n\||\n\}\}|$)/g;
      var lm;
      while ( (lm = lr.exec(block)) !== null ) {
        f[lm[1].trim()] = lm[2].trim();
      }
      if (f.id) out.push({
        id:f.id, author:f.author||'Anonymous',
        ts:f.timestamp||'', quote:f.quote||'', text:f.text||''
      });
    }
    return out;
  }

  // ════════════════════════════════════════════════════════════════════
  // BOOKMARK FLOW
  // ════════════════════════════════════════════════════════════════════

  function openBookmarkComposer() {
    hideFab();
    positionComposer( $bmComposer );
    $bmComposer.addClass('gra-composer-visible');
    $bmInput.val('').focus();
  }

  function closeBookmarkComposer() {
    $bmComposer.removeClass('gra-composer-visible');
    $bmInput.val('');
    _selRange = null;
    _selText  = '';
    _selRect  = null;
  }

  function submitBookmark() {
    var name  = $bmInput.val().trim() || ( 'Bookmark ' + (_bookmarks.length+1) );
    var id    = uid();
    var ts    = nowIso();
    var quote = _selText.slice(0,120) + (_selText.length>120?'…':'');

    // Compute occurrence index BEFORE wrapSelection nulls _selRange
    var needle     = _selText.replace(/…$/, '').trim().slice(0, 80);
    var quoteIndex = computeQuoteIndex( needle, _selRange );

    var span = wrapSelection( id, 'gra-bookmark-highlight' );
    if ( span ) {
      span.setAttribute('data-gra-id',   id);
      span.setAttribute('data-gra-name', name);
    }

    // Store quoteIndex for accurate restore on page reload
    var entry = { id:id, name:name, quote:quote, quoteIndex:quoteIndex, ts:ts };
    _bookmarks.push( entry );
    persistBookmarks();
    renderBookmarkCards();
    closeBookmarkComposer();
    openPanel('bookmarks');
  }

  function deleteBookmark( id ) {
    _bookmarks = _bookmarks.filter(function(b){ return b.id !== id; });
    var span = document.querySelector('[data-gra-id="' + id + '"].gra-bookmark-highlight');
    if (span) {
      var parent = span.parentNode;
      while (span.firstChild) parent.insertBefore(span.firstChild, span);
      parent.removeChild(span);
    }
    persistBookmarks();
    renderBookmarkCards();
  }

  function persistBookmarks() {
    try { localStorage.setItem(BM_LS_KEY, JSON.stringify(_bookmarks)); } catch(e){}
  }

  function loadBookmarks() {
    try {
      var raw = localStorage.getItem(BM_LS_KEY);
      if (raw) _bookmarks = JSON.parse(raw) || [];
    } catch(e){ _bookmarks = []; }
  }

  // ════════════════════════════════════════════════════════════════════
  // PANEL — open / close / tabs
  // ════════════════════════════════════════════════════════════════════

  function openPanel( tab ) {
    _activeTab = tab || _activeTab;
    switchTab( _activeTab );
    $panel.addClass('gra-panel-open');
    $backdrop.addClass('gra-backdrop-visible');
  }

  function closePanel() {
    $panel.removeClass('gra-panel-open');
    $backdrop.removeClass('gra-backdrop-visible');
  }

  function switchTab( tab ) {
    _activeTab = tab;
    $tabComments.toggleClass('gra-tab-active',  tab==='comments');
    $tabBookmarks.toggleClass('gra-tab-active', tab==='bookmarks');
    $paneComments.toggleClass('gra-pane-active',  tab==='comments');
    $paneBookmarks.toggleClass('gra-pane-active', tab==='bookmarks');
    if (tab==='comments') {
      loadComments(function(){ renderCommentCards(); });
    } else {
      renderBookmarkCards();
    }
  }

  // ════════════════════════════════════════════════════════════════════
  // RENDER CARDS
  // ════════════════════════════════════════════════════════════════════

  function renderCommentCards() {
    if ( _comments.length === 0 ) {
      $paneComments.html('<div class="gra-empty-state">No comments yet.<br>Select text and click 💬 to add one.</div>');
      return;
    }
    var canDelete = !!currentUser;
    var html = '';
    _comments.slice().reverse().forEach(function(c){
      html += '<div class="gra-comment-card" data-gra-id="' + esc(c.id) + '">'
            + '<div class="gra-card-header">'
            + '<div class="gra-avatar">' + esc((c.author||'?').charAt(0).toUpperCase()) + '</div>'
            + '<div class="gra-card-meta">'
            + '<div class="gra-card-author">' + esc(c.author) + '</div>'
            + (c.ts ? '<div class="gra-card-ts">' + esc(fmtTs(c.ts)) + '</div>' : '')
            + '</div>'
            + ( canDelete
                ? '<button class="gra-comment-del" data-del-id="' + esc(c.id) + '" title="Delete comment">×</button>'
                : '' )
            + '</div>'
            + (c.quote ? '<div class="gra-card-quote">' + esc(c.quote) + '</div>' : '')
            + '<div class="gra-card-text">' + esc(c.text) + '</div>'
            + '</div>';
    });
    $paneComments.html(html);
  }

  function renderBookmarkCards() {
    if ( _bookmarks.length === 0 ) {
      $paneBookmarks.html('<div class="gra-empty-state">No bookmarks yet.<br>Select text and click 🔖 to save a bookmark.</div>');
      return;
    }
    var html = '';
    _bookmarks.slice().reverse().forEach(function(b){
      html += '<div class="gra-bookmark-card" data-gra-id="' + esc(b.id) + '">'
            + '<span class="gra-icon gra-icon-bookmark"></span>'
            + '<div class="gra-bookmark-info">'
            + '<div class="gra-bookmark-name">' + esc(b.name) + '</div>'
            + (b.quote ? '<div class="gra-bookmark-quote">' + esc(b.quote) + '</div>' : '')
            + '</div>'
            + '<button class="gra-bookmark-del" data-del-id="' + esc(b.id) + '" title="Remove bookmark">×</button>'
            + '</div>';
    });
    $paneBookmarks.html(html);
  }

  // ════════════════════════════════════════════════════════════════════
  // SCROLL TO HIGHLIGHT
  // ════════════════════════════════════════════════════════════════════

  function scrollToHighlight( id ) {
    var el = document.querySelector('[data-gra-id="' + id + '"]');
    if (!el) return;
    el.scrollIntoView({ behavior:'smooth', block:'center' });
    el.classList.add('gra-hl-active');
    setTimeout(function(){ el.classList.remove('gra-hl-active'); }, 2000);
  }

  // ════════════════════════════════════════════════════════════════════
  // EVENT WIRING
  // ════════════════════════════════════════════════════════════════════

  function wireEvents() {

    // ── Selection → show FAB ──────────────────────────────────────
    $( document ).on('mouseup keyup', function(){
      setTimeout(function(){
        if ( $cmpComposer.hasClass('gra-composer-visible') ) return;
        if ( $bmComposer.hasClass('gra-composer-visible') ) return;
        if ( captureSelection() ) { showFab( _selRect ); }
        else { hideFab(); }
      }, 20);
    });

    // ── Click outside → hide FAB ──────────────────────────────────
    $( document ).on('mousedown', function(e){
      var $t = $(e.target);
      if ( !$t.closest('#gra-fab').length &&
           !$t.closest('.gra-composer').length &&
           !$t.closest('.gra-bm-composer').length ) {
        hideFab();
      }
    });

    // ── FAB: Comment ──────────────────────────────────────────────
    $( '#gra-fab-comment' ).on('click', function(e){
      e.preventDefault(); e.stopPropagation();
      if ( !captureSelection() ) return;
      openCommentComposer();
    });

    // ── FAB: Bookmark ─────────────────────────────────────────────
    $( '#gra-fab-bookmark' ).on('click', function(e){
      e.preventDefault(); e.stopPropagation();
      if ( !captureSelection() ) return;
      openBookmarkComposer();
    });

    // ── Comment composer ──────────────────────────────────────────
    $cmpInput.on('input', function(){
      $cmpSubmit.prop('disabled', !$(this).val().trim() || !currentUser);
    });
    $( '#gra-cmp-cancel' ).on('click', function(){ closeCommentComposer(); hideFab(); });
    $cmpSubmit.on('click', submitComment);
    $cmpInput.on('keydown', function(e){
      if ((e.ctrlKey||e.metaKey) && e.key==='Enter') { submitComment(); }
      if (e.key==='Escape') { closeCommentComposer(); hideFab(); }
    });

    // ── Bookmark composer ─────────────────────────────────────────
    $( '#gra-bm-cancel' ).on('click', function(){ closeBookmarkComposer(); hideFab(); });
    $bmSubmit.on('click', submitBookmark);
    $bmInput.on('keydown', function(e){
      if (e.key==='Enter')  submitBookmark();
      if (e.key==='Escape') { closeBookmarkComposer(); hideFab(); }
    });

    // ── Panel close ───────────────────────────────────────────────
    $( '#gra-panel-close' ).on('click', closePanel);
    $backdrop.on('click', closePanel);

    // ── Tab switching ─────────────────────────────────────────────
    $tabComments.on('click',  function(){ switchTab('comments');  });
    $tabBookmarks.on('click', function(){ switchTab('bookmarks'); });

    // ── Panel: click comment card body → scroll to highlight ──────
    $paneComments.on('click', '.gra-comment-card', function(e){
      if ( $(e.target).hasClass('gra-comment-del') ) return;
      var id = $(this).attr('data-gra-id');
      if (id) scrollToHighlight(id);
    });

    // ── Panel: delete comment ─────────────────────────────────────
    $paneComments.on('click', '.gra-comment-del', function(e){
      e.stopPropagation();
      var id = $(this).attr('data-del-id');
      if ( !id ) return;
      if ( !window.confirm('Delete this comment? This cannot be undone.') ) return;
      deleteComment(id);
    });

    // ── Panel: click bookmark card → scroll to highlight ──────────
    $paneBookmarks.on('click', '.gra-bookmark-card', function(e){
      if ( $(e.target).hasClass('gra-bookmark-del') ) return;
      var id = $(this).attr('data-gra-id');
      if (id) scrollToHighlight(id);
    });

    // ── Panel: delete bookmark ────────────────────────────────────
    $paneBookmarks.on('click', '.gra-bookmark-del', function(e){
      e.stopPropagation();
      var id = $(this).attr('data-del-id');
      if (id) deleteBookmark(id);
    });

    // ── Click highlight in text → open panel ─────────────────────
    $( CONTENT_SEL ).on('click', '.gra-comment-highlight', function(){
      var id = $(this).attr('data-gra-id');
      openPanel('comments');
      setTimeout(function(){
        var $card = $paneComments.find('[data-gra-id="'+id+'"]');
        if ($card.length) {
          $card.addClass('gra-card-active');
          $card[0].scrollIntoView({behavior:'smooth',block:'nearest'});
          setTimeout(function(){ $card.removeClass('gra-card-active'); }, 2000);
        }
      }, 100);
    });

    $( CONTENT_SEL ).on('click', '.gra-bookmark-highlight', function(){
      var id = $(this).attr('data-gra-id');
      openPanel('bookmarks');
      setTimeout(function(){
        var $card = $paneBookmarks.find('[data-gra-id="'+id+'"]');
        if ($card.length) $card[0].scrollIntoView({behavior:'smooth',block:'nearest'});
      }, 100);
    });

    // ── Escape key ────────────────────────────────────────────────
    $( document ).on('keydown', function(e){
      if (e.key==='Escape'){
        if ($cmpComposer.hasClass('gra-composer-visible')) { closeCommentComposer(); hideFab(); }
        else if ($bmComposer.hasClass('gra-composer-visible')) { closeBookmarkComposer(); hideFab(); }
        else closePanel();
      }
    });
  }

  // ════════════════════════════════════════════════════════════════════
  // PERSIST / RESTORE HIGHLIGHT ANCHORS
  // ════════════════════════════════════════════════════════════════════

  function persistCommentHighlight( id, quote, quoteIndex ) {
    try {
      var stored = JSON.parse( localStorage.getItem( CMT_LS_KEY ) || '[]' );
      stored = stored.filter( function(h){ return h.id !== id; } );
      stored.push( { id:id, quote:quote, quoteIndex: quoteIndex || 0 } );
      localStorage.setItem( CMT_LS_KEY, JSON.stringify( stored ) );
    } catch(e){}
  }

  function removeCommentHighlight( id ) {
    try {
      var stored = JSON.parse( localStorage.getItem( CMT_LS_KEY ) || '[]' );
      stored = stored.filter( function(h){ return h.id !== id; } );
      localStorage.setItem( CMT_LS_KEY, JSON.stringify( stored ) );
    } catch(e){}
  }

  function restoreCommentHighlights() {
    var stored = [];
    try { stored = JSON.parse( localStorage.getItem( CMT_LS_KEY ) || '[]' ); } catch(e){}
    stored.forEach( function(h) {
      if ( !h.quote || !h.id ) return;
      if ( document.querySelector( '[data-gra-id="' + h.id + '"].gra-comment-highlight' ) ) return;
      var needle = h.quote.replace(/…$/, '').trim().slice(0, 80);
      if ( !needle ) return;
      var range = findNthOccurrence( document.querySelector(CONTENT_SEL), needle, h.quoteIndex || 0 );
      if ( range ) {
        var span = document.createElement('span');
        span.className = 'gra-comment-highlight';
        span.setAttribute('data-gra-id', h.id);
        try { range.surroundContents(span); } catch(e){}
      }
    });
  }

  function restoreBookmarkHighlights() {
    _bookmarks.forEach(function(b){
      if ( !b.quote ) return;
      if ( document.querySelector('[data-gra-id="'+b.id+'"].gra-bookmark-highlight') ) return;
      var contentEl = document.querySelector( CONTENT_SEL );
      if (!contentEl) return;
      var needle = b.quote.replace(/…$/,'').trim().slice(0,80);
      if (!needle) return;
      // Use stored quoteIndex; default to 0 for older entries without it
      var found = findNthOccurrence( contentEl, needle, b.quoteIndex || 0 );
      if (found) {
        var span = document.createElement('span');
        span.className = 'gra-bookmark-highlight';
        span.setAttribute('data-gra-id',   b.id);
        span.setAttribute('data-gra-name', b.name);
        try { found.surroundContents(span); } catch(e){}
      }
    });
  }

  // ════════════════════════════════════════════════════════════════════
  // FIND Nth OCCURRENCE of needle in root's text
  // Replaces the old findTextInContent() which always returned the first
  // occurrence, causing wrong highlight placement for repeated Sanskrit text.
  // ════════════════════════════════════════════════════════════════════

  function findNthOccurrence( root, needle, occurrenceIndex ) {
    if ( !root || !needle ) return null;
    var text = root.textContent || '';

    // Find char offset of the Nth occurrence
    var charIdx = -1;
    var count   = 0;
    var searchFrom = 0;
    while ( (charIdx = text.indexOf(needle, searchFrom)) !== -1 ) {
      if ( count === occurrenceIndex ) break;
      count++;
      searchFrom = charIdx + needle.length;
    }
    if ( charIdx === -1 ) {
      // Requested occurrence not found — fall back to first
      charIdx = text.indexOf(needle);
      if ( charIdx === -1 ) return null;
    }

    // Walk text nodes to map charIdx → DOM node + offset
    var iter = document.createNodeIterator(root, NodeFilter.SHOW_TEXT, null, false);
    var pos  = 0;
    var node, startNode, startOffset, endNode, endOffset;
    while ( (node = iter.nextNode()) ) {
      var len    = node.nodeValue.length;
      var endIdx = charIdx + needle.length;
      if ( !startNode && pos + len > charIdx ) {
        startNode   = node;
        startOffset = charIdx - pos;
      }
      if ( startNode && pos + len >= endIdx ) {
        endNode   = node;
        endOffset = endIdx - pos;
        break;
      }
      pos += len;
    }
    if ( !startNode || !endNode ) return null;
    var range = document.createRange();
    range.setStart(startNode, startOffset);
    range.setEnd(endNode, endOffset);
    return range;
  }

  // ════════════════════════════════════════════════════════════════════
  // BOOT
  // ════════════════════════════════════════════════════════════════════

  $( function () {
    buildDom();
    wireEvents();
    loadBookmarks();
    restoreBookmarkHighlights();
    restoreCommentHighlights();
    loadComments(function(){
      if (_comments.length > 0) {
        $tabComments.find('span.gra-icon').after(
          ' <span style="background:#e53935;color:#fff;border-radius:9px;' +
          'font-size:10px;padding:0 5px;margin-left:2px;">' + _comments.length + '</span>'
        );
        var $badge = $( '#gra-toggle-badge' );
        if ( $badge.length ) $badge.text( _comments.length ).css('display','flex');
      }
    });
  } );

}() );