/* GCOVR Custom JavaScript - Tree View & Interactivity */

(function() {
  'use strict';

  // Wait for DOM ready
  document.addEventListener('DOMContentLoaded', function() {
    initTheme();
    initSidebar();
    initSidebarResize();
    initMobileMenu();
    initFileTree();
    initNavOverride();
    initBreadcrumbs();
    initSearch();
    initFunctionRows();
    initSorting();
    initToggleButtons();
    initCoverageNav();
    initTreeControls();
    initViewToggle();
    initSettingsDropdown();
    initTlaNavigation();
    initLineHighlight();
    initColumnToggles();
    initPopupResize();
    initFileNavTooltips();
    initFileNavKeys();
    initFunctionListPersistence();

    // Reveal page now that all init is done
    document.documentElement.classList.remove('no-transitions');

    // Prefetch linked pages on hover for instant navigation
    initPrefetch();
  });

  // ===========================================
  // Breadcrumb Links
  // ===========================================

  // Find a node in the tree by its link (HTML filename) and return
  // the full ancestor path as an array of nodes from root to target.
  function findPathInTree(nodes, targetLink) {
    for (var i = 0; i < nodes.length; i++) {
      var node = nodes[i];
      if (node.link === targetLink) {
        return [node];
      }
      if (node.children) {
        var childPath = findPathInTree(node.children, targetLink);
        if (childPath) {
          return [node].concat(childPath);
        }
      }
    }
    return null;
  }

  function initBreadcrumbs() {
    var currentSpan = document.querySelector('.breadcrumb .current');
    if (!currentSpan || !window.GCOVR_TREE_DATA) {
      if (currentSpan) currentSpan.classList.add('ready');
      return;
    }

    // Find current page in tree by its HTML filename — this is unambiguous
    // since each page only appears once in the tree.
    var currentPage = window.location.pathname.split('/').pop() || 'index.html';
    var treePath = findPathInTree(window.GCOVR_TREE_DATA, currentPage);

    if (!treePath || treePath.length === 0) {
      currentSpan.classList.add('ready');
      return;
    }

    // Build breadcrumb from the tree path (ancestor nodes → current node)
    var fragment = document.createDocumentFragment();
    var matchedSegments = [];

    // Fill an element with the segments of a (possibly joined) name like
    // "boost/url", rendering "boost", a separator, "url". Used so a joined
    // directory shows its segments inline yet remains one hyperlink target.
    function appendSegments(parentEl, name) {
      var segments = name.split('/');
      for (var k = 0; k < segments.length; k++) {
        if (k > 0) {
          var inner = document.createElement('span');
          inner.className = 'separator';
          inner.textContent = '/';
          parentEl.appendChild(inner);
        }
        parentEl.appendChild(document.createTextNode(segments[k]));
      }
    }

    for (var i = 0; i < treePath.length; i++) {
      var node = treePath[i];
      var isLast = (i === treePath.length - 1);

      if (i > 0) {
        var sep = document.createElement('span');
        sep.className = 'separator';
        sep.textContent = '/';
        fragment.appendChild(sep);
      }

      matchedSegments.push(node.name);

      if (node.link && !isLast) {
        var a = document.createElement('a');
        a.href = node.link;
        appendSegments(a, node.name);
        fragment.appendChild(a);
      } else {
        var span = document.createElement('span');
        span.className = 'current-file';
        appendSegments(span, node.name);
        fragment.appendChild(span);
      }
    }

    currentSpan.innerHTML = '';
    currentSpan.appendChild(fragment);
    currentSpan.classList.add('ready');

    // Update source-filename to match breadcrumb path
    var sourceFilename = document.querySelector('.source-filename');
    if (sourceFilename) {
      sourceFilename.textContent = matchedSegments.join('/');
    }
  }

  // ===========================================
  // Theme Toggle
  // ===========================================

  function initTheme() {
    const toggle = document.getElementById('theme-toggle');
    const iconSun = toggle ? toggle.querySelector('.icon-sun') : null;
    const iconMoon = toggle ? toggle.querySelector('.icon-moon') : null;

    // Get system preference
    function getSystemTheme() {
      return window.matchMedia('(prefers-color-scheme: light)').matches ? 'light' : 'dark';
    }

    // Get effective theme: saved preference or OS default
    function getEffectiveTheme() {
      var saved = localStorage.getItem('gcovr-theme');
      return (saved === 'light' || saved === 'dark') ? saved : getSystemTheme();
    }

    // Apply theme to document
    function applyTheme(theme) {
      document.documentElement.setAttribute('data-theme', theme);
      if (iconSun) iconSun.style.display = (theme === 'dark') ? 'block' : 'none';
      if (iconMoon) iconMoon.style.display = (theme === 'light') ? 'block' : 'none';
    }

    // Apply current theme
    applyTheme(getEffectiveTheme());

    // Listen for system theme changes — only apply if no stored preference
    window.matchMedia('(prefers-color-scheme: light)').addEventListener('change', function() {
      var saved = localStorage.getItem('gcovr-theme');
      if (saved !== 'light' && saved !== 'dark') {
        applyTheme(getSystemTheme());
      }
    });

    // Toggle between light and dark on click
    if (toggle) {
      toggle.addEventListener('click', function() {
        var current = getEffectiveTheme();
        var next = (current === 'dark') ? 'light' : 'dark';
        localStorage.setItem('gcovr-theme', next);
        applyTheme(next);
      });
    }
  }

  // ===========================================
  // Tree Controls (Expand/Collapse All)
  // ===========================================

  function initTreeControls() {
    var expandBtn = document.getElementById('expand-all');
    var collapseBtn = document.getElementById('collapse-all');

    if (expandBtn) {
      expandBtn.addEventListener('click', function() {
        document.querySelectorAll('.tree-item').forEach(function(item) {
          if (!item.classList.contains('no-children')) {
            item.classList.add('expanded');
            var toggle = item.querySelector(':scope > .tree-item-header > .tree-folder-toggle');
            if (toggle) toggle.textContent = '−';
          }
        });
        saveExpandedFolders();
      });
    }

    if (collapseBtn) {
      collapseBtn.addEventListener('click', function() {
        document.querySelectorAll('.tree-item').forEach(function(item) {
          item.classList.remove('expanded');
          var toggle = item.querySelector(':scope > .tree-item-header > .tree-folder-toggle');
          if (toggle) toggle.textContent = '+';
        });
        saveExpandedFolders();
      });
    }
  }

  // ===========================================
  // Sidebar Toggle
  // ===========================================

  function initSidebar() {
    const sidebar = document.getElementById('sidebar');
    const toggle = document.getElementById('sidebar-toggle');
    const header = sidebar ? sidebar.querySelector('.sidebar-header') : null;

    if (!sidebar) return;

    // Load saved state
    const isCollapsed = localStorage.getItem('sidebar-collapsed') === 'true';
    if (isCollapsed) {
      sidebar.classList.add('collapsed');
    }

    // Toggle button
    if (toggle) {
      toggle.addEventListener('click', function() {
        sidebar.classList.toggle('collapsed');
        sidebar.classList.remove('hover-expand');
        var isNowCollapsed = sidebar.classList.contains('collapsed');
        localStorage.setItem('sidebar-collapsed', isNowCollapsed);
        // Restore custom width when un-collapsing
        if (!isNowCollapsed) {
          var savedWidth = localStorage.getItem('gcovr-sidebar-width');
          if (savedWidth) {
            document.documentElement.style.setProperty('--sidebar-width', savedWidth + 'px');
          }
        }
      });
    }

    // Hover expand - expands when hovering sidebar content (not header or no-expand zones)
    var hoverTimeout = null;
    var HOVER_DELAY = 150; // ms delay before expanding
    var isOverContent = false;

    // Check if element is within a no-expand zone
    function isInNoExpandZone(el) {
      while (el && el !== sidebar) {
        if (el.classList && el.classList.contains('no-expand')) {
          return true;
        }
        el = el.parentElement;
      }
      return false;
    }

    function scheduleExpand() {
      if (hoverTimeout) return; // already scheduled
      if (sidebar.classList.contains('hover-expand')) return; // already expanded
      hoverTimeout = setTimeout(function() {
        if (isOverContent) {
          sidebar.classList.add('hover-expand');
        }
        hoverTimeout = null;
      }, HOVER_DELAY);
    }

    function cancelExpand() {
      if (hoverTimeout) {
        clearTimeout(hoverTimeout);
        hoverTimeout = null;
      }
      sidebar.classList.remove('hover-expand');
    }

    sidebar.addEventListener('mouseenter', function(e) {
      if (!sidebar.classList.contains('collapsed')) return;
      // Check if entering over content area (not header or no-expand zones)
      if (!header.contains(e.target) && !isInNoExpandZone(e.target)) {
        isOverContent = true;
        scheduleExpand();
      }
    });

    sidebar.addEventListener('mousemove', function(e) {
      if (!sidebar.classList.contains('collapsed')) return;
      var wasOverContent = isOverContent;
      isOverContent = !header.contains(e.target) && !isInNoExpandZone(e.target);

      if (isOverContent && !wasOverContent && !sidebar.classList.contains('hover-expand')) {
        scheduleExpand();
      }
    });

    sidebar.addEventListener('mouseleave', function() {
      isOverContent = false;
      cancelExpand();
    });
  }

  // ===========================================
  // Sidebar Resize
  // ===========================================

  function initSidebarResize() {
    var sidebar = document.getElementById('sidebar');
    var handle = document.getElementById('sidebar-resize-handle');
    if (!sidebar || !handle) return;

    var MIN_WIDTH = 200;
    var startX, startWidth;

    // Restore saved width
    var savedWidth = localStorage.getItem('gcovr-sidebar-width');
    if (savedWidth && !sidebar.classList.contains('collapsed')) {
      var w = parseInt(savedWidth, 10);
      if (w >= MIN_WIDTH) {
        document.documentElement.style.setProperty('--sidebar-width', w + 'px');
      }
    }

    function getMaxWidth() {
      return Math.floor(window.innerWidth * 0.5);
    }

    function onMouseMove(e) {
      var newWidth = startWidth + (e.clientX - startX);
      var maxW = getMaxWidth();
      if (newWidth < MIN_WIDTH) newWidth = MIN_WIDTH;
      if (newWidth > maxW) newWidth = maxW;
      document.documentElement.style.setProperty('--sidebar-width', newWidth + 'px');
    }

    function onMouseUp() {
      document.body.classList.remove('sidebar-resizing');
      document.removeEventListener('mousemove', onMouseMove);
      document.removeEventListener('mouseup', onMouseUp);
      // Save the current width
      var computed = parseInt(getComputedStyle(sidebar).width, 10);
      localStorage.setItem('gcovr-sidebar-width', computed);
    }

    handle.addEventListener('mousedown', function(e) {
      if (sidebar.classList.contains('collapsed')) return;
      e.preventDefault();
      startX = e.clientX;
      startWidth = parseInt(getComputedStyle(sidebar).width, 10);
      document.body.classList.add('sidebar-resizing');
      document.addEventListener('mousemove', onMouseMove);
      document.addEventListener('mouseup', onMouseUp);
    });

    // Double-click to reset to default width
    var DEFAULT_WIDTH = 320;
    handle.addEventListener('dblclick', function() {
      if (sidebar.classList.contains('collapsed')) return;
      document.documentElement.style.setProperty('--sidebar-width', DEFAULT_WIDTH + 'px');
      localStorage.setItem('gcovr-sidebar-width', DEFAULT_WIDTH);
    });
  }

  // ===========================================
  // Mobile Menu
  // ===========================================

  function initMobileMenu() {
    var sidebar = document.getElementById('sidebar');
    var menuBtn = document.getElementById('mobile-menu-btn');
    var backdrop = document.getElementById('sidebar-backdrop');

    if (!menuBtn || !sidebar) return;

    // Open sidebar on hamburger click
    menuBtn.addEventListener('click', function() {
      sidebar.classList.add('mobile-open');
    });

    // Close on backdrop click
    if (backdrop) {
      backdrop.addEventListener('click', function() {
        sidebar.classList.remove('mobile-open');
      });
    }

    // Close when clicking a navigation link
    sidebar.addEventListener('click', function(e) {
      if (e.target.closest('a[href]')) {
        sidebar.classList.remove('mobile-open');
      }
    });

    // Close on escape key
    document.addEventListener('keydown', function(e) {
      if (e.key === 'Escape' && sidebar.classList.contains('mobile-open')) {
        sidebar.classList.remove('mobile-open');
      }
    });
  }

  // ===========================================
  // File Tree - Load from tree.json
  // ===========================================

  function initFileTree() {
    var treeContainer = document.getElementById('file-tree');
    if (!treeContainer) return;

    // Tree data is produced already-normalized and already-sorted by the
    // upstream tooling (Python's gcovr_build_tree.py or gcovr itself), so
    // no normalize/sort pass is needed here. We just join single-child
    // dir chains for sidebar compactness before rendering.
      joinSingleChildDirs(window.GCOVR_TREE_DATA);
      sortTree(window.GCOVR_TREE_DATA);
      renderTree(treeContainer, window.GCOVR_TREE_DATA);
  }

  // Re-sort the tree: directories first, then files, alphabetically within
  // each group. Python already sorts each level, but normalizeTree creates
  // synthetic directory nodes from multi-segment FILE entries (e.g. a deep
  // chain like subdir1/subdir2/subdir3/file.hpp that gcovr itself collapsed).
  // Those synthetic dirs end up wherever the originating file landed in the
  // Python sort — i.e. in the file bucket — so without this pass they appear
  // mixed in with the files instead of at the top with the other directories.
  function sortTree(nodes) {
    if (!nodes || nodes.length === 0) return;
    nodes.sort(function(a, b) {
      var aIsDir = a.isDirectory || (a.children && a.children.length > 0);
      var bIsDir = b.isDirectory || (b.children && b.children.length > 0);
      if (aIsDir && !bIsDir) return -1;
      if (!aIsDir && bIsDir) return 1;
      var aName = (a.name || '').toLowerCase();
      var bName = (b.name || '').toLowerCase();
      return aName.localeCompare(bName);
    });
    for (var i = 0; i < nodes.length; i++) {
      if (nodes[i].children) sortTree(nodes[i].children);
    }
  }

  // Join chains of single-child directories into one sidebar entry.
  // If a directory contains nothing but one child directory, the two are
  // merged: the name becomes "parent/child", and the link + stats are taken
  // from the (deepest) child. The grandchildren become the new children.
  // Repeats until the chain ends (multiple children, or a file appears).
  // Result: e.g. include > boost > url > [files] becomes include/boost/url
  // as a single entry whose click navigates straight to the url directory.
  function joinSingleChildDirs(nodes) {
    if (!nodes) return;
    for (var i = 0; i < nodes.length; i++) {
      var node = nodes[i];
      if (!node.isDirectory || !node.children) continue;
      while (node.children.length === 1 && node.children[0].isDirectory) {
        var child = node.children[0];
        node.name = node.name + '/' + child.name;
        // The joined entry represents the deepest directory for clicks
        // and for the coverage stats shown next to it. Statically-named
        // assignments avoid the dynamic [key] indexing that static
        // analyzers flag as a prototype-pollution risk.
        if (child.link) node.link = child.link;
        if (child.coverage) node.coverage = child.coverage;
        if (child.coverageClass) node.coverageClass = child.coverageClass;
        if (child.linesTotal) node.linesTotal = child.linesTotal;
        if (child.linesExec) node.linesExec = child.linesExec;
        if (child.linesCoverage) node.linesCoverage = child.linesCoverage;
        if (child.linesClass) node.linesClass = child.linesClass;
        if (child.functionsCoverage) node.functionsCoverage = child.functionsCoverage;
        if (child.functionsClass) node.functionsClass = child.functionsClass;
        if (child.branchesCoverage) node.branchesCoverage = child.branchesCoverage;
        if (child.branchesClass) node.branchesClass = child.branchesClass;
        node.children = child.children || [];
      }
      joinSingleChildDirs(node.children);
    }
  }

  // Save expanded folder paths to localStorage
  function saveExpandedFolders() {
    var paths = [];
    document.querySelectorAll('.tree-item.expanded[data-tree-path]').forEach(function(el) {
      paths.push(el.getAttribute('data-tree-path'));
    });
    localStorage.setItem('gcovr-expanded-folders', JSON.stringify(paths));
  }

  function renderTree(container, tree) {
    container.innerHTML = '';

    if (!tree || tree.length === 0) {
      container.innerHTML = '<div class="tree-loading">No files found</div>';
      return;
    }

    tree.forEach(function(item) {
      container.appendChild(createTreeItem(item, ''));
    });

    // Auto-expand to current file and highlight it
    expandToCurrentFile(container);
  }

  function expandToCurrentFile(container) {
    // Get current page filename
    var currentPage = window.location.pathname.split('/').pop() || 'index.html';

    // Find the link matching current page
    var currentLink = container.querySelector('a[href="' + currentPage + '"]');

    if (currentLink) {
      // Mark as active
      var treeItem = currentLink.closest('.tree-item');
      if (treeItem) {
        treeItem.classList.add('active');
      }

      // Expand all parent folders
      var parent = currentLink.closest('.tree-children');
      while (parent) {
        var parentItem = parent.closest('.tree-item');
        if (parentItem) {
          parentItem.classList.add('expanded');
          var toggle = parentItem.querySelector(':scope > .tree-item-header > .tree-folder-toggle');
          if (toggle) toggle.textContent = '−';
        }
        parent = parentItem ? parentItem.parentElement.closest('.tree-children') : null;
      }
    }

    // Restore previously expanded folders from localStorage
    try {
      var saved = localStorage.getItem('gcovr-expanded-folders');
      if (saved) {
        var paths = JSON.parse(saved);
        paths.forEach(function(path) {
          var el = container.querySelector('.tree-item[data-tree-path="' + CSS.escape(path) + '"]');
          if (el && !el.classList.contains('no-children')) {
            el.classList.add('expanded');
            var toggle = el.querySelector(':scope > .tree-item-header > .tree-folder-toggle');
            if (toggle) toggle.textContent = '−';
          }
        });
      }
    } catch (e) {
      // Ignore localStorage errors
    }

    // Scroll active item into view instantly
    if (currentLink) {
      currentLink.scrollIntoView({ block: 'center', behavior: 'instant' });
    }
  }

  // Clean relative path prefixes like '../../../' from names
  function cleanPathName(name) {
    if (!name) return 'unknown';
    // Remove leading ./ or ../
    while (name.indexOf('./') === 0 || name.indexOf('../') === 0) {
      if (name.indexOf('./') === 0) {
        name = name.substring(2);
      } else if (name.indexOf('../') === 0) {
        name = name.substring(3);
      }
    }
    return name || 'unknown';
  }

  // Get just the filename from a path
  function getDisplayName(name) {
    var cleaned = cleanPathName(name);
    var lastSlash = cleaned.lastIndexOf('/');
    return lastSlash >= 0 ? cleaned.substring(lastSlash + 1) : cleaned;
  }

  function createTreeItem(item, parentPath) {
    var hasChildren = item.children && item.children.length > 0;
    var isDirectory = item.isDirectory || hasChildren;
    var cleanedName = cleanPathName(item.name);
    var treePath = parentPath ? (parentPath + '/' + cleanedName) : cleanedName;

    var div = document.createElement('div');
    div.className = 'tree-item' + (isDirectory ? ' is-folder' : '') + (hasChildren ? '' : ' no-children');
    div.setAttribute('data-tree-path', treePath);

    var header = document.createElement('div');
    header.className = 'tree-item-header';
    var toggle = null;

    // Toggle button (+/-) for folders with children
    if (hasChildren) {
      toggle = document.createElement('button');
      toggle.className = 'tree-folder-toggle';
      toggle.textContent = '+';
      toggle.setAttribute('aria-label', 'Toggle folder');
      toggle.addEventListener('click', function(e) {
        e.stopPropagation();
        e.preventDefault();
        var isExpanded = div.classList.toggle('expanded');
        toggle.textContent = isExpanded ? '−' : '+';
        saveExpandedFolders();
      });
      header.appendChild(toggle);

      // Make entire header clickable to expand/collapse
      header.style.cursor = 'pointer';
      header.addEventListener('click', function(e) {
        // If clicking directly on a link, let it navigate
        if (e.target.closest('a')) return;
        e.preventDefault();
        var isExpanded = div.classList.toggle('expanded');
        toggle.textContent = isExpanded ? '−' : '+';
        saveExpandedFolders();
      });
    } else {
      var spacer = document.createElement('span');
      spacer.className = 'tree-spacer';
      header.appendChild(spacer);
    }

    // Icon - different for folders vs files
    var icon = document.createElement('span');
    if (isDirectory) {
      icon.className = 'tree-icon tree-icon-folder';
      icon.innerHTML = '<svg viewBox="0 0 16 16" width="16" height="16"><path fill="currentColor" d="M1.75 1A1.75 1.75 0 000 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0016 13.25v-8.5A1.75 1.75 0 0014.25 3H7.5a.25.25 0 01-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75z"/></svg>';
    } else {
      icon.className = 'tree-icon tree-icon-file';
      icon.innerHTML = '<svg viewBox="0 0 16 16" width="16" height="16"><path fill="currentColor" d="M3.75 1.5a.25.25 0 00-.25.25v12.5c0 .138.112.25.25.25h9.5a.25.25 0 00.25-.25V6h-2.75A1.75 1.75 0 019 4.25V1.5H3.75zm6.75.062V4.25c0 .138.112.25.25.25h2.688l-2.938-2.938zM2 1.75C2 .784 2.784 0 3.75 0h6.586c.464 0 .909.184 1.237.513l2.914 2.914c.329.328.513.773.513 1.237v9.586A1.75 1.75 0 0113.25 16h-9.5A1.75 1.75 0 012 14.25V1.75z"/></svg>';
    }
    header.appendChild(icon);

    // Label (with link if available)
    // Use the full cleaned name so joined-dir entries like "boost/url"
    // display as a single multi-segment label in the sidebar.
    var displayName = cleanPathName(item.name);
    var tooltipText = cleanPathName(item.fullPath || item.name);
    var label = document.createElement('span');
    label.className = 'tree-label';
    label.title = tooltipText;
    if (item.link) {
      var link = document.createElement('a');
      link.href = item.link;
      link.textContent = displayName;
      link.title = tooltipText;
      label.appendChild(link);
    } else {
      label.textContent = displayName;
    }
    header.appendChild(label);

    div.appendChild(header);

    // Children container (for expand/collapse)
    if (hasChildren) {
      var childrenWrapper = document.createElement('div');
      childrenWrapper.className = 'tree-children';

      var childrenInner = document.createElement('div');
      childrenInner.className = 'tree-children-inner';
      item.children.forEach(function(child) {
        childrenInner.appendChild(createTreeItem(child, treePath));
      });

      childrenWrapper.appendChild(childrenInner);
      div.appendChild(childrenWrapper);
    }

    return div;
  }

  // ===========================================
  // Search
  // ===========================================

  function initSearch() {
    const searchInput = document.getElementById('file-search');
    const fileTree = document.getElementById('file-tree');
    const clearBtn = document.getElementById('search-clear');
    const searchContainer = searchInput ? searchInput.closest('.sidebar-search') : null;
    if (!searchInput || !fileTree) return;

    // Store pre-search expanded state so we can restore it
    var preSearchExpanded = null;

    // Create no-results message
    var noResults = document.createElement('div');
    noResults.className = 'search-no-results';
    noResults.textContent = 'No matching files';
    noResults.style.display = 'none';
    fileTree.appendChild(noResults);

    function updateClearButton() {
      if (searchContainer) {
        searchContainer.classList.toggle('has-query', searchInput.value.trim() !== '');
      }
    }

    // Clear button
    if (clearBtn) {
      clearBtn.addEventListener('click', function() {
        searchInput.value = '';
        sessionStorage.removeItem('gcovr-search');
        updateClearButton();
        performSearch('');
        searchInput.focus();
      });
    }

    var debounceTimer = null;
    searchInput.addEventListener('input', function() {
      updateClearButton();
      clearTimeout(debounceTimer);
      debounceTimer = setTimeout(function() {
        var val = searchInput.value;
        if (val.trim() !== '') {
          sessionStorage.setItem('gcovr-search', val);
        } else {
          sessionStorage.removeItem('gcovr-search');
        }
        performSearch(val);
      }, 150);
    });

    // Restore search state from sessionStorage on page load (synchronous
    // since initFileTree has already built the tree before initSearch runs)
    var savedSearch = sessionStorage.getItem('gcovr-search');
    if (savedSearch) {
      searchInput.value = savedSearch;
      updateClearButton();
      performSearch(savedSearch);
    }

    function performSearch(value) {
      var query = value.toLowerCase().trim();
      var allItems = fileTree.querySelectorAll('.tree-item');

      // Clear all highlights
      fileTree.querySelectorAll('.search-highlight').forEach(function(mark) {
        var parent = mark.parentNode;
        parent.replaceChild(document.createTextNode(mark.textContent), mark);
        parent.normalize();
      });

      // If query is empty, restore original state
      if (query === '') {
        noResults.style.display = 'none';
        allItems.forEach(function(item) {
          item.style.display = '';
          item.classList.remove('search-match');
        });
        // Restore pre-search expanded state
        if (preSearchExpanded !== null) {
          allItems.forEach(function(item) {
            var path = item.getAttribute('data-tree-path');
            var toggle = item.querySelector(':scope > .tree-item-header > .tree-folder-toggle');
            if (toggle) {
              if (preSearchExpanded.indexOf(path) >= 0) {
                item.classList.add('expanded');
                toggle.textContent = '\u2212';
              } else {
                item.classList.remove('expanded');
                toggle.textContent = '+';
              }
            }
          });
          preSearchExpanded = null;
        }
        return;
      }

      // Save expanded state before first search
      if (preSearchExpanded === null) {
        preSearchExpanded = [];
        allItems.forEach(function(item) {
          if (item.classList.contains('expanded')) {
            preSearchExpanded.push(item.getAttribute('data-tree-path'));
          }
        });
      }

      // Determine which items match (check full path and display name)
      var matchSet = new Set();

      allItems.forEach(function(item) {
        var path = (item.getAttribute('data-tree-path') || '').toLowerCase();
        var label = item.querySelector(':scope > .tree-item-header > .tree-label');
        var text = label ? label.textContent.toLowerCase() : '';
        if (path.includes(query) || text.includes(query)) {
          matchSet.add(item);
        }
      });

      // Also mark all ancestor items of matches as visible
      var visibleSet = new Set(matchSet);
      matchSet.forEach(function(item) {
        var parent = item.parentElement;
        while (parent && parent !== fileTree) {
          if (parent.classList && parent.classList.contains('tree-item')) {
            visibleSet.add(parent);
          }
          parent = parent.parentElement;
        }
      });

      // Apply visibility, expand parents of matches, highlight text
      var anyVisible = false;
      allItems.forEach(function(item) {
        var isVisible = visibleSet.has(item);
        item.style.display = isVisible ? '' : 'none';
        item.classList.toggle('search-match', matchSet.has(item));

        if (isVisible) {
          anyVisible = true;
          // Auto-expand folders that contain matches
          var toggle = item.querySelector(':scope > .tree-item-header > .tree-folder-toggle');
          if (toggle && visibleSet.has(item) && !matchSet.has(item) || (toggle && matchSet.has(item) && item.classList.contains('is-folder'))) {
            item.classList.add('expanded');
            toggle.textContent = '\u2212';
          }
        }

        // Highlight matched text in label
        if (matchSet.has(item)) {
          var label = item.querySelector(':scope > .tree-item-header > .tree-label');
          if (label) {
            highlightText(label, query);
          }
        }
      });

      noResults.style.display = anyVisible ? 'none' : '';
    }

    function highlightText(container, query) {
      // Walk text nodes inside the label (may be inside an <a> tag)
      var walker = document.createTreeWalker(container, NodeFilter.SHOW_TEXT, null, false);
      var textNodes = [];
      while (walker.nextNode()) {
        textNodes.push(walker.currentNode);
      }
      textNodes.forEach(function(node) {
        var text = node.textContent;
        var lowerText = text.toLowerCase();
        var idx = lowerText.indexOf(query);
        if (idx === -1) return;

        var frag = document.createDocumentFragment();
        var lastIdx = 0;
        while (idx !== -1) {
          if (idx > lastIdx) {
            frag.appendChild(document.createTextNode(text.substring(lastIdx, idx)));
          }
          var mark = document.createElement('mark');
          mark.className = 'search-highlight';
          mark.textContent = text.substring(idx, idx + query.length);
          frag.appendChild(mark);
          lastIdx = idx + query.length;
          idx = lowerText.indexOf(query, lastIdx);
        }
        if (lastIdx < text.length) {
          frag.appendChild(document.createTextNode(text.substring(lastIdx)));
        }
        node.parentNode.replaceChild(frag, node);
      });
    }
  }

  // ===========================================
  // Progressive Function Row Rendering
  // ===========================================

  function initFunctionRows() {
    var dataEl = document.getElementById('functions-data');
    if (!dataEl) return;

    var config = window.__functionsPageConfig || {};
    var data = JSON.parse(dataEl.textContent);
    var container = document.querySelector('.functions-body');
    var loadingEl = document.getElementById('functions-loading');
    var showBranches = config.showBranches;
    var showConditions = config.showConditions;
    var singlePage = config.singlePage;
    var currentFile = config.htmlFilename || '';

    if (data.length === 0) {
      if (loadingEl) loadingEl.remove();
      return;
    }

    // --- Virtual scrolling setup ---
    var ROW_HEIGHT = 52;
    var BUFFER = 10;
    var visibleCount = Math.max(30, Math.ceil(container.clientHeight / ROW_HEIGHT) + BUFFER * 2);
    var viewport, visibleEl;
    var lastStartIdx = -1;

    window.addEventListener('resize', function() {
      visibleCount = Math.max(30, Math.ceil(container.clientHeight / ROW_HEIGHT) + BUFFER * 2);
      lastStartIdx = -1;
      renderVisible();
    });

    function buildHref(entry) {
      if (singlePage) return '#' + entry.html_filename + '|l' + entry.line;
      if (currentFile !== entry.html_filename) return entry.html_filename + '#l' + entry.line;
      return '#l' + entry.line;
    }

    function entryKey(entry) {
      return entry.name + '|' + entry.filename + ':' + entry.line;
    }

    function el(tag, cls, text) {
      var node = document.createElement(tag);
      if (cls) node.className = cls;
      if (text !== undefined) node.textContent = text;
      return node;
    }

    function createRow(entry) {
      var row = el('div', 'function-row');
      if (highlightKey && entryKey(entry) === highlightKey) {
        row.classList.add('function-row-visited');
      }

      // col-function
      var colFn = el('div', 'col-function');
      var a = document.createElement('a');
      a.href = buildHref(entry);
      a.appendChild(el('span', 'function-name', entry.name));
      a.appendChild(el('span', 'function-location', entry.filename + ':' + entry.line));
      colFn.appendChild(a);
      row.appendChild(colFn);

      // col-calls
      var colCalls = el('div', 'col-calls');
      var callSpan;
      if (entry.excluded) {
        callSpan = el('span', 'excluded', 'excluded');
      } else if (entry.execution_count === 0) {
        callSpan = el('span', 'not-called', 'not called');
      } else {
        callSpan = el('span', 'called', entry.execution_count + 'x');
      }
      colCalls.appendChild(callSpan);
      row.appendChild(colCalls);

      // col-lines
      row.appendChild(el('div', 'col-lines', entry.line_coverage + '%'));

      // col-branches (optional)
      if (showBranches) {
        row.appendChild(el('div', 'col-branches', entry.branch_coverage + '%'));
      }

      // col-conditions (optional)
      if (showConditions) {
        row.appendChild(el('div', 'col-conditions', entry.condition_coverage + '%'));
      }

      return row;
    }

    function setupVirtualScroll() {
      if (loadingEl) loadingEl.remove();

      viewport = document.createElement('div');
      viewport.className = 'functions-viewport';
      viewport.style.height = (data.length * ROW_HEIGHT) + 'px';

      visibleEl = document.createElement('div');
      visibleEl.className = 'functions-visible';

      viewport.appendChild(visibleEl);
      container.appendChild(viewport);
    }

    function renderVisible() {
      var scrollTop = container.scrollTop;
      var startIdx = Math.max(0, Math.floor(scrollTop / ROW_HEIGHT) - BUFFER);
      var endIdx = Math.min(data.length, startIdx + visibleCount + BUFFER);

      // Skip re-render if the window hasn't shifted
      if (startIdx === lastStartIdx) return;
      lastStartIdx = startIdx;

      visibleEl.style.top = (startIdx * ROW_HEIGHT) + 'px';

      var frag = document.createDocumentFragment();
      for (var i = startIdx; i < endIdx; i++) {
        frag.appendChild(createRow(data[i]));
      }
      visibleEl.replaceChildren(frag);
    }

    // --- Scroll listener (rAF-throttled) ---
    var ticking = false;
    container.addEventListener('scroll', function() {
      if (!ticking) {
        requestAnimationFrame(function() { renderVisible(); ticking = false; });
        ticking = true;
      }
    });

    // --- Save state on navigation for back-button restore ---
    var highlightKey = null;
    container.addEventListener('click', function(e) {
      var row = e.target.closest('.function-row');
      if (!row) return;
      var link = row.querySelector('a');
      if (!link) return;
      var nameEl = row.querySelector('.function-name');
      var locEl = row.querySelector('.function-location');
      if (nameEl && locEl) {
        sessionStorage.setItem('gcovr-functions-clicked', nameEl.textContent + '|' + locEl.textContent);
      }
      sessionStorage.setItem('gcovr-functions-scrollTop', String(container.scrollTop));
    });

    // --- Data-level sorting ---
    function sortData(key, ascending) {
      data.sort(function(a, b) {
        var aVal, bVal;
        switch (key) {
          case 'name': aVal = a.name; bVal = b.name; break;
          case 'calls': aVal = a.excluded ? -1 : a.execution_count; bVal = b.excluded ? -1 : b.execution_count; break;
          case 'lines': aVal = parseFloat(a.line_coverage) || 0; bVal = parseFloat(b.line_coverage) || 0; break;
          case 'branches': aVal = parseFloat(a.branch_coverage) || 0; bVal = parseFloat(b.branch_coverage) || 0; break;
          case 'conditions': aVal = parseFloat(a.condition_coverage) || 0; bVal = parseFloat(b.condition_coverage) || 0; break;
          default: aVal = a.name; bVal = b.name;
        }
        if (typeof aVal === 'string' && typeof bVal === 'string') {
          return ascending ? aVal.localeCompare(bVal) : bVal.localeCompare(aVal);
        }
        return ascending ? aVal - bVal : bVal - aVal;
      });
      lastStartIdx = -1; // force re-render
      viewport.style.height = (data.length * ROW_HEIGHT) + 'px';
      renderVisible();
    }

    // Intercept sort clicks on functions-header before initSorting runs
    var funcHeaders = document.querySelectorAll('.functions-header .sortable');
    funcHeaders.forEach(function(header) {
      header.addEventListener('click', function(e) {
        e.stopPropagation();
        var sortKey = this.dataset.sort;
        var isAscending = this.classList.contains('sorted-ascending');

        // Update header classes
        funcHeaders.forEach(function(h) {
          h.classList.remove('sorted-ascending', 'sorted-descending');
        });
        this.classList.add(isAscending ? 'sorted-descending' : 'sorted-ascending');

        sortData(sortKey, !isAscending);
      }, true); // capture phase to beat initSorting
    });

    // --- Restore saved state (scroll + highlight) ---
    function restoreSavedState() {
      var saved = sessionStorage.getItem('gcovr-functions-clicked');
      if (saved !== null) {
        sessionStorage.removeItem('gcovr-functions-clicked');
        highlightKey = saved;
      }
      var scroll = sessionStorage.getItem('gcovr-functions-scrollTop');
      if (scroll !== null) {
        sessionStorage.removeItem('gcovr-functions-scrollTop');
        container.scrollTop = parseInt(scroll, 10);
      }
      if (saved !== null || scroll !== null) {
        lastStartIdx = -1;
        renderVisible();
      }
    }

    // --- Initialize ---
    data.sort(function(a, b) { return a.name.localeCompare(b.name); });

    setupVirtualScroll();
    renderVisible();
    restoreSavedState();

    // Also restore on bfcache navigation (browser Back button)
    window.addEventListener('pageshow', function(e) {
      if (e.persisted) restoreSavedState();
    });

    // Mark functions page so initSorting can skip it
    container.dataset.virtualScroll = 'true';
  }



  // ===========================================
  // Sorting
  // ===========================================

  function initSorting() {
    var headerSets = [
      {
        selector: '.file-list-header .sortable, .functions-header .sortable',
        getContainer: function() {
          return document.getElementById('file-list') || document.querySelector('.functions-body');
        },
        defaultSort: { key: 'filename', ascending: true }
      },
      {
        selector: '.source-function-header .sortable',
        getContainer: function() {
          return document.querySelector('.source-functions-list');
        },
        defaultSort: null
      }
    ];

    headerSets.forEach(function(set) {
      var headers = document.querySelectorAll(set.selector);
      if (!headers.length) return;

      headers.forEach(function(header) {
        header.addEventListener('click', function() {
          var sortKey = this.dataset.sort;
          var isAscending = this.classList.contains('sorted-ascending');

          headers.forEach(function(h) {
            h.classList.remove('sorted-ascending', 'sorted-descending');
          });

          this.classList.add(isAscending ? 'sorted-descending' : 'sorted-ascending');

          sortList(set.getContainer(), sortKey, !isAscending);
        });
      });

      if (set.defaultSort) {
        sortList(set.getContainer(), set.defaultSort.key, set.defaultSort.ascending);
      }
    });
  }

  function sortList(container, key, ascending) {
    if (!container) return;
    // Virtual scroll handles its own sorting
    if (container.dataset.virtualScroll) return;

    var headerEl = container.querySelector('.source-function-header, .file-list-header, .functions-header');
    var rows = Array.from(container.children).filter(function(el) { return el !== headerEl; });

    rows.sort(function(a, b) {
      // Directories always come first
      var aIsDir = a.classList.contains('directory');
      var bIsDir = b.classList.contains('directory');
      if (aIsDir && !bIsDir) return -1;
      if (!aIsDir && bIsDir) return 1;

      var aVal = a.dataset[key] || a.querySelector('[data-sort]')?.dataset.sort || '';
      var bVal = b.dataset[key] || b.querySelector('[data-sort]')?.dataset.sort || '';

      // Try to parse as numbers
      var aNum = parseFloat(aVal);
      var bNum = parseFloat(bVal);

      if (!isNaN(aNum) && !isNaN(bNum)) {
        return ascending ? aNum - bNum : bNum - aNum;
      }

      // String comparison
      return ascending ? aVal.localeCompare(bVal) : bVal.localeCompare(aVal);
    });

    rows.forEach(function(row) {
      container.appendChild(row);
    });
  }

  // ===========================================
  // Toggle Buttons (Coverage Lines)
  // ===========================================

  function initToggleButtons() {
    const buttons = document.querySelectorAll('.button_toggle_coveredLine, .button_toggle_uncoveredLine, .button_toggle_partialCoveredLine, .button_toggle_excludedLine');

    buttons.forEach(function(button) {
      var lineClass = button.value;
      if (!document.querySelector('.' + lineClass)) {
        button.disabled = true;
        button.classList.remove('show_' + lineClass);
        return;
      }
      button.addEventListener('click', function() {
        const lineClass = this.value;
        const showClass = 'show_' + lineClass;

        // Toggle the button state
        this.classList.toggle(showClass);

        // Toggle visibility of lines
        const lines = document.querySelectorAll('.' + lineClass);
        lines.forEach(function(line) {
          line.classList.toggle(showClass);
        });
        document.dispatchEvent(new CustomEvent('coverage-toggled'));
      });
    });

    // Also handle simpler toggle buttons
    const simpleToggles = document.querySelectorAll('.btn-toggle');
    simpleToggles.forEach(function(button) {
      button.addEventListener('click', function() {
        // Use data attribute to get line class (persists after toggle)
        const lineClass = this.dataset.lineClass;
        if (!lineClass) return;

        const showClass = 'show_' + lineClass;
        this.classList.toggle(showClass);
        const lines = document.querySelectorAll('.' + lineClass);
        lines.forEach(function(line) {
          line.classList.toggle(showClass);
        });
        document.dispatchEvent(new CustomEvent('coverage-toggled'));
      });
    });
  }

  // ===========================================
  // Coverage Navigation (prev/next uncovered)
  // ===========================================

  function initCoverageNav() {
    var prevBtn = document.getElementById('nav-prev');
    var nextBtn = document.getElementById('nav-next');
    var counter = document.getElementById('nav-counter');

    if (!prevBtn || !nextBtn || !counter) return;

    var gapLines = [];
    var currentIndex = -1;

    function collectGapLines() {
      var uncovered = document.querySelectorAll('tr.uncoveredLine.show_uncoveredLine');
      var partial = document.querySelectorAll('tr.partialCoveredLine.show_partialCoveredLine');
      var merged = [];
      var i;
      for (i = 0; i < uncovered.length; i++) merged.push(uncovered[i]);
      for (i = 0; i < partial.length; i++) merged.push(partial[i]);
      // Sort by DOM order
      merged.sort(function(a, b) {
        var pos = a.compareDocumentPosition(b);
        if (pos & Node.DOCUMENT_POSITION_FOLLOWING) return -1;
        if (pos & Node.DOCUMENT_POSITION_PRECEDING) return 1;
        return 0;
      });
      gapLines = merged;
      currentIndex = -1;
      updateCounter();
    }

    function updateCounter() {
      if (gapLines.length === 0) {
        counter.textContent = 'All lines covered';
        prevBtn.disabled = true;
        nextBtn.disabled = true;
      } else {
        var display = currentIndex >= 0 ? (currentIndex + 1) : 0;
        counter.textContent = display + ' / ' + gapLines.length;
        prevBtn.disabled = false;
        nextBtn.disabled = false;
      }
    }

    function navigateTo(index) {
      if (gapLines.length === 0) return;
      // Remove previous highlight
      var prev = document.querySelector('tr.source-line.nav-highlight');
      if (prev) prev.classList.remove('nav-highlight');

      currentIndex = index;
      var row = gapLines[currentIndex];
      row.scrollIntoView({ block: 'center', behavior: 'instant' });
      row.classList.add('nav-highlight');
      setTimeout(function() {
        row.classList.remove('nav-highlight');
      }, 1500);
      updateCounter();
    }

    function nextGap() {
      if (gapLines.length === 0) return;
      var next = currentIndex + 1;
      if (next >= gapLines.length) next = 0;
      navigateTo(next);
    }

    function prevGap() {
      if (gapLines.length === 0) return;
      var prev = currentIndex - 1;
      if (prev < 0) prev = gapLines.length - 1;
      navigateTo(prev);
    }

    prevBtn.addEventListener('click', prevGap);
    nextBtn.addEventListener('click', nextGap);

    document.addEventListener('keydown', function(e) {
      var tag = (e.target.tagName || '').toLowerCase();
      if (tag === 'input' || tag === 'textarea' || e.target.isContentEditable) return;
      if (e.key === 'n') nextGap();
      if (e.key === 'p') prevGap();
    });

    document.addEventListener('coverage-toggled', function() {
      collectGapLines();
    });

    collectGapLines();
  }

  // ===========================================
  // View Toggle (Nested / Flat)
  // ===========================================

  function initViewToggle() {
    var toggleContainer = document.getElementById('view-toggle');
    var fileList = document.getElementById('file-list');
    var appContainer = document.querySelector('.app-container');

    if (!toggleContainer) return;

    // Always show the toggle
    toggleContainer.style.display = '';

    var buttons = toggleContainer.querySelectorAll('.view-btn');
    var savedView = localStorage.getItem('gcovr-view-mode');

    function setActiveButton(view) {
      buttons.forEach(function(btn) {
        btn.classList.toggle('active', btn.dataset.view === view);
      });
    }

    // On non-directory pages (file/source views), still respect flat mode for sidebar
    if (!fileList) {
      if (appContainer && savedView === 'flat') {
        appContainer.classList.add('flat-mode');
        setActiveButton('flat');
      }

      // Allow toggling view mode from source pages
      buttons.forEach(function(btn) {
        btn.addEventListener('click', function() {
          var view = this.dataset.view;
          localStorage.setItem('gcovr-view-mode', view);
          setActiveButton(view);
          if (appContainer) {
            if (view === 'flat') {
              appContainer.classList.add('flat-mode');
            } else {
              appContainer.classList.remove('flat-mode');
              document.documentElement.classList.remove('early-flat-mode');
            }
          }
        });
      });
      return;
    }

    var originalNodes = null; // stash for restoring nested view

    function collectFlatFiles(nodes, parentPath) {
      var results = [];
      for (var i = 0; i < nodes.length; i++) {
        var node = nodes[i];
        var cleanedName = node.name;
        // Remove leading ./ or ../
        while (cleanedName.indexOf('./') === 0 || cleanedName.indexOf('../') === 0) {
          cleanedName = cleanedName.indexOf('./') === 0 ? cleanedName.substring(2) : cleanedName.substring(3);
        }
        var fullPath = parentPath ? (parentPath + '/' + cleanedName) : cleanedName;

        if (node.isDirectory && node.children && node.children.length > 0) {
          results = results.concat(collectFlatFiles(node.children, fullPath));
        } else if (!node.isDirectory) {
          var copy = {};
          for (var key in node) {
            if (node.hasOwnProperty(key)) copy[key] = node[key];
          }
          copy.fullPath = fullPath;
          results.push(copy);
        }
      }
      return results;
    }

    function buildFlatRow(file) {
      var row = document.createElement('div');
      row.className = 'file-row file';
      row.setAttribute('data-filename', file.fullPath);
      row.setAttribute('data-coverage', file.coverage || '0');
      row.setAttribute('data-lines', file.linesTotal || '');
      row.setAttribute('data-functions', file.functionsCoverage || '');
      row.setAttribute('data-branches', file.branchesCoverage || '');

      // Col name
      var colName = document.createElement('div');
      colName.className = 'col-name';

      var icon = document.createElement('span');
      icon.className = 'file-icon';
      icon.innerHTML = '<svg viewBox="0 0 16 16" width="16" height="16"><path fill="currentColor" d="M3.75 1.5a.25.25 0 00-.25.25v12.5c0 .138.112.25.25.25h9.5a.25.25 0 00.25-.25V6h-2.75A1.75 1.75 0 019 4.25V1.5H3.75zm6.75.062V4.25c0 .138.112.25.25.25h2.688a.252.252 0 00-.011-.013l-2.914-2.914a.272.272 0 00-.013-.011zM2 1.75C2 .784 2.784 0 3.75 0h6.586c.464 0 .909.184 1.237.513l2.914 2.914c.329.328.513.773.513 1.237v9.586A1.75 1.75 0 0113.25 16h-9.5A1.75 1.75 0 012 14.25V1.75z"></path></svg>';
      colName.appendChild(icon);

      if (file.link) {
        var a = document.createElement('a');
        a.href = file.link;
        a.textContent = file.fullPath;
        a.title = file.fullPath;
        colName.appendChild(a);
      } else {
        var span = document.createElement('span');
        span.className = 'no-link';
        span.textContent = file.fullPath;
        span.title = file.fullPath;
        colName.appendChild(span);
      }
      row.appendChild(colName);

      // Col coverage
      var colCov = document.createElement('div');
      colCov.className = 'col-coverage';

      var barContainer = document.createElement('div');
      barContainer.className = 'coverage-bar-container';
      var bar = document.createElement('div');
      var linesCov = file.linesCoverage || '';
      var linesClass = file.linesClass || file.coverageClass || '';
      bar.className = 'coverage-bar ' + linesClass;
      bar.style.width = (linesCov && linesCov !== '-') ? linesCov + '%' : '0%';
      barContainer.appendChild(bar);
      colCov.appendChild(barContainer);

      var pct = document.createElement('span');
      pct.className = 'coverage-percent ' + linesClass;
      pct.textContent = (linesCov && linesCov !== '-') ? linesCov + '%' : '-';
      colCov.appendChild(pct);
      row.appendChild(colCov);

      // Col lines
      var colLines = document.createElement('div');
      colLines.className = 'col-lines';
      var execSpan = document.createElement('span');
      execSpan.className = 'stat-value';
      execSpan.textContent = file.linesExec || '';
      colLines.appendChild(execSpan);
      var sep = document.createElement('span');
      sep.className = 'stat-separator';
      sep.textContent = '/';
      colLines.appendChild(sep);
      var totalSpan = document.createElement('span');
      totalSpan.className = 'stat-total';
      totalSpan.textContent = file.linesTotal || '';
      colLines.appendChild(totalSpan);
      row.appendChild(colLines);

      // Col functions (check if container has the column)
      var container = fileList.closest('.file-list-container');
      var hasFunctions = !container || !container.classList.contains('no-functions');
      var hasBranches = !container || !container.classList.contains('no-branches');
      var hasConditions = !container || !container.classList.contains('no-conditions');
      var hasDecision = !container || !container.classList.contains('no-decisions');
      var hasCalls = !container || !container.classList.contains('no-calls');

      if (hasFunctions) {
        var colFunc = document.createElement('div');
        colFunc.className = 'col-functions';
        var funcVal = document.createElement('span');
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    var prefetched = {};

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