perf-sentinel-core 0.5.2

Core library for perf-sentinel: polyglot performance anti-pattern detector
Documentation 
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    --color-background-warning: #3d2f1f;
    --color-background-success: #1f3d2f;
    --color-text-primary: #e8e8e8;
    --color-text-secondary: #a0a0a0;
    --color-text-tertiary: #707070;
    --color-text-info: #6babff;
    --color-text-danger: #ff7a7a;
    --color-text-warning: #f0b05f;
    --color-text-success: #5fd495;
    --color-border-tertiary: rgba(255,255,255,0.1);
    --color-border-secondary: rgba(255,255,255,0.2);
    --color-border-info: #378add;
    --color-border-success: #3d7d5c;
    --page-bg: #121212;
  }
  :root[data-theme="light"] {
    --color-background-primary: #ffffff;
    --color-background-secondary: #f5f5f5;
    --color-background-tertiary: #ececec;
    --color-background-info: #e6f1fb;
    --color-background-danger: #fcebeb;
    --color-background-warning: #faeeda;
    --color-background-success: #eaf3de;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #555555;
    --color-text-tertiary: #888888;
    --color-text-info: #0c447c;
    --color-text-danger: #791f1f;
    --color-text-warning: #633806;
    --color-text-success: #27500a;
    --color-border-tertiary: rgba(0,0,0,0.1);
    --color-border-secondary: rgba(0,0,0,0.2);
    --color-border-info: #378add;
    --color-border-success: #7ab85a;
    --page-bg: #fafafa;
  }
  :root {
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, Monaco, monospace;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
  }
  * { box-sizing: border-box; }
  body { margin: 0; padding: 24px; background: var(--page-bg); color: var(--color-text-primary); font-family: var(--font-sans); font-size: 13px; line-height: 1.5; }
  .ps-container { max-width: 1100px; margin: 0 auto; }
  .ps-header-ctrl { display: flex; justify-content: flex-end; align-items: center; margin-bottom: 10px; font-size: 11px; color: var(--color-text-tertiary); }
  .ps-theme-toggle { background: transparent; border: 0.5px solid var(--color-border-tertiary); color: var(--color-text-secondary); padding: 4px 10px; border-radius: var(--border-radius-md); cursor: pointer; font-size: 11px; font-family: inherit; }
  .ps-theme-toggle:hover { border-color: var(--color-border-secondary); }
  .ps-topbar { display: flex; align-items: center; gap: 12px; padding: 10px 14px; border: 0.5px solid var(--color-border-tertiary); border-radius: var(--border-radius-md); background: var(--color-background-secondary); margin-bottom: 12px; flex-wrap: wrap; }
  .ps-brand { font-weight: 500; font-size: 14px; }
  .ps-meta { color: var(--color-text-secondary); font-size: 12px; font-family: var(--font-mono); }
  .ps-gate-pass { margin-left: auto; background: var(--color-background-success); color: var(--color-text-success); padding: 3px 10px; border-radius: var(--border-radius-md); font-size: 11px; font-weight: 500; }
  .ps-gate-fail { margin-left: auto; background: var(--color-background-danger); color: var(--color-text-danger); padding: 3px 10px; border-radius: var(--border-radius-md); font-size: 11px; font-weight: 500; }
  .ps-tabs { display: flex; gap: 2px; border-bottom: 0.5px solid var(--color-border-tertiary); margin-bottom: 14px; }
  .ps-tab { padding: 8px 14px; font-size: 13px; cursor: pointer; border: none; background: transparent; color: var(--color-text-secondary); border-bottom: 2px solid transparent; margin-bottom: -0.5px; font-family: inherit; }
  .ps-tab:hover { color: var(--color-text-primary); }
  .ps-tab.active { color: var(--color-text-primary); border-bottom-color: var(--color-text-primary); font-weight: 500; }
  .ps-tab .ps-badge { display: inline-block; margin-left: 6px; padding: 1px 7px; border-radius: 10px; font-size: 10px; background: var(--color-background-tertiary); color: var(--color-text-secondary); }
  .ps-metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 14px; }
  .ps-metrics-3 { grid-template-columns: repeat(3, 1fr); }
  .ps-metric { background: var(--color-background-secondary); border-radius: var(--border-radius-md); padding: 10px 12px; }
  .ps-metric-label { font-size: 11px; color: var(--color-text-secondary); margin-bottom: 4px; }
  .ps-metric-value { font-size: 20px; font-weight: 500; font-family: var(--font-mono); word-break: break-word; }
  .ps-metric-value-sm { font-size: 14px; line-height: 1.4; }
  .ps-metric-sub { font-size: 11px; color: var(--color-text-tertiary); font-family: var(--font-mono); }
  .ps-filters { display: flex; gap: 6px; margin-bottom: 10px; flex-wrap: wrap; align-items: center; }
  .ps-chip-group { display: contents; }
  .ps-chip { padding: 4px 10px; font-size: 11px; border-radius: 12px; border: 0.5px solid var(--color-border-tertiary); background: transparent; cursor: pointer; color: var(--color-text-secondary); font-family: inherit; }
  .ps-chip:hover { background: var(--color-background-secondary); }
  .ps-chip.active { background: var(--color-text-primary); color: var(--color-background-primary); border-color: var(--color-text-primary); }
  .ps-list { display: flex; flex-direction: column; gap: 6px; }
  .ps-row { display: grid; grid-template-columns: 60px 1fr auto; align-items: center; gap: 10px; padding: 10px 12px; border: 0.5px solid var(--color-border-tertiary); border-radius: var(--border-radius-md); cursor: pointer; background: var(--color-background-primary); }
  .ps-row:hover { background: var(--color-background-secondary); border-color: var(--color-border-secondary); }
  .ps-row.selected { border: 2px solid var(--color-border-info); padding: 9px 11px; }
  .ps-sev-crit { background: var(--color-background-danger); color: var(--color-text-danger); font-size: 10px; font-weight: 500; padding: 3px 8px; border-radius: var(--border-radius-md); text-align: center; }
  .ps-sev-warn { background: var(--color-background-warning); color: var(--color-text-warning); font-size: 10px; font-weight: 500; padding: 3px 8px; border-radius: var(--border-radius-md); text-align: center; }
  .ps-sev-info { background: var(--color-background-info); color: var(--color-text-info); font-size: 10px; font-weight: 500; padding: 3px 8px; border-radius: var(--border-radius-md); text-align: center; }
  .ps-fin-main { min-width: 0; }
  .ps-fin-type { font-weight: 500; font-size: 13px; margin-bottom: 2px; }
  .ps-fin-service { color: var(--color-text-tertiary); font-weight: 400; font-size: 11px; }
  .ps-fin-detail { font-size: 11px; color: var(--color-text-secondary); font-family: var(--font-mono); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .ps-fin-right { font-size: 11px; color: var(--color-text-secondary); font-family: var(--font-mono); text-align: right; white-space: nowrap; }
  .ps-fin-right-sub { color: var(--color-text-tertiary); }
  .ps-tree-header { font-size: 11px; color: var(--color-text-secondary); margin-bottom: 8px; font-family: var(--font-mono); word-break: break-all; }
  .ps-tree { font-family: var(--font-mono); font-size: 12px; padding: 10px 12px; background: var(--color-background-secondary); border-radius: var(--border-radius-md); line-height: 1.9; }
  .ps-span { display: grid; grid-template-columns: 1fr auto; gap: 10px; padding: 2px 4px; border-radius: 4px; }
  .ps-span.dim { color: var(--color-text-tertiary); }
  .ps-span.hilite { background: var(--color-background-danger); }
  .ps-span-text { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .ps-span-dur { color: var(--color-text-tertiary); white-space: nowrap; }
  .ps-span-find { color: var(--color-text-danger); font-weight: 500; }
  .ps-drill { background: var(--color-background-info); border: 0.5px solid var(--color-border-info); border-radius: var(--border-radius-md); padding: 10px 12px; margin-top: 10px; font-size: 12px; color: var(--color-text-info); }
  .ps-drill-label { font-size: 10px; color: var(--color-text-info); margin-bottom: 4px; opacity: 0.8; }
  .ps-drill-link { color: var(--color-text-info); }
  .ps-banner { background: var(--color-background-info); border: 0.5px solid var(--color-border-info); border-radius: var(--border-radius-md); padding: 8px 12px; margin-bottom: 10px; font-size: 11px; color: var(--color-text-info); }
  .ps-empty { padding: 30px; text-align: center; color: var(--color-text-secondary); font-size: 13px; background: var(--color-background-secondary); border-radius: var(--border-radius-md); }
  .ps-table { width: 100%; font-size: 11px; font-family: var(--font-mono); border-collapse: collapse; }
  .ps-table th { text-align: left; font-weight: 500; padding: 6px 8px; border-bottom: 0.5px solid var(--color-border-tertiary); color: var(--color-text-secondary); font-size: 10px; font-family: var(--font-sans); }
  .ps-table td { padding: 6px 8px; border-bottom: 0.5px solid var(--color-border-tertiary); vertical-align: top; }
  /* Highlight row on Explain -> pg_stat cross-nav. Scoped to the
     pg_stat table so other .ps-table instances (diff, green regions)
     stay unaffected if they ever adopt a .hilite class for another
     purpose. */
  #pgstat-body tr.hilite { background: var(--color-background-danger); }
  #pgstat-body tr.hilite td:first-child { color: var(--color-text-danger); font-weight: 500; }
  .ps-footer { margin-top: 14px; font-size: 11px; color: var(--color-text-tertiary); text-align: center; }
  .ps-credit { margin-top: 8px; font-size: 11px; color: var(--color-text-tertiary); text-align: center; }
  .ps-credit a { color: var(--color-text-secondary); text-decoration: underline; }
  .ps-credit a:hover { color: var(--color-text-primary); }
  .ps-kbd { font-family: var(--font-mono); font-size: 10px; background: var(--color-background-tertiary); padding: 1px 5px; border-radius: 3px; color: var(--color-text-secondary); }
  .ps-search { display: none; width: 100%; padding: 6px 10px; margin-bottom: 10px; font-size: 12px; font-family: var(--font-sans); background: var(--color-background-secondary); border: 0.5px solid var(--color-border-tertiary); border-radius: var(--border-radius-md); color: var(--color-text-primary); }
  .ps-search:focus { outline: none; border-color: var(--color-border-info); }
  .ps-span.ps-span-pgstat-link { cursor: pointer; }
  .ps-span.ps-span-pgstat-link:hover .ps-span-text { text-decoration: underline; }
  .ps-drill-clear { color: var(--color-text-info); text-decoration: underline; cursor: pointer; margin-left: 8px; }
  .ps-diff-section { margin-bottom: 18px; }
  .ps-diff-section-header { font-size: 12px; font-weight: 500; margin-bottom: 8px; color: var(--color-text-primary); }
  .ps-diff-section-header.red { color: var(--color-text-danger); }
  .ps-diff-section-header.green { color: var(--color-text-success); }
  .ps-panel-toolbar { display: flex; justify-content: flex-end; margin-bottom: 8px; }
  .ps-export-btn { padding: 4px 10px; font-size: 11px; border-radius: var(--border-radius-md); border: 0.5px solid var(--color-border-info); background: transparent; cursor: pointer; color: var(--color-text-info); font-family: inherit; }
  .ps-export-btn:hover { background: var(--color-background-info); }
  .ps-copy-link-btn { padding: 4px 10px; font-size: 11px; border-radius: var(--border-radius-md); border: 0.5px solid var(--color-border-info); background: transparent; cursor: pointer; color: var(--color-text-info); font-family: inherit; margin-left: 6px; }
  .ps-copy-link-btn:hover { background: var(--color-background-info); }
  .ps-correlation-clickable { cursor: pointer; }
  .ps-correlation-clickable:hover { background: var(--color-background-tertiary); }
  .ps-show-more { margin-top: 10px; padding: 6px 12px; font-size: 11px; border-radius: var(--border-radius-md); border: 0.5px solid var(--color-border-tertiary); background: transparent; color: var(--color-text-secondary); cursor: pointer; font-family: inherit; width: 100%; }
  .ps-show-more:hover { background: var(--color-background-secondary); border-color: var(--color-border-secondary); }
  dialog.ps-modal { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); max-width: 520px; width: calc(100% - 40px); background: var(--color-background-secondary); color: var(--color-text-primary); border-radius: var(--border-radius-lg); border: 0.5px solid var(--color-border-tertiary); padding: 18px 22px; box-shadow: 0 8px 32px rgba(0,0,0,0.4); }
  dialog.ps-modal::backdrop { background: rgba(0,0,0,0.6); }
  dialog.ps-modal h2 { margin: 0 0 12px 0; font-size: 14px; font-weight: 500; }
  .ps-modal-close { position: absolute; top: 8px; right: 10px; background: transparent; border: none; color: var(--color-text-secondary); font-family: inherit; font-size: 16px; cursor: pointer; line-height: 1; padding: 4px 8px; }
  .ps-modal-close:hover { color: var(--color-text-primary); }
  dialog.ps-modal table { width: 100%; border-collapse: collapse; }
  dialog.ps-modal th { text-align: left; padding: 4px 6px; font-size: 10px; font-weight: 500; color: var(--color-text-secondary); border-bottom: 0.5px solid var(--color-border-tertiary); font-family: var(--font-sans); }
  dialog.ps-modal th:first-child { width: 90px; }
  dialog.ps-modal td { padding: 5px 6px; font-size: 12px; vertical-align: top; }
  dialog.ps-modal td:first-child { width: 90px; white-space: nowrap; }
</style>
</head>
<body>
<div class="ps-container">
  <div class="ps-header-ctrl">
    <button class="ps-theme-toggle" id="theme-toggle" type="button">Toggle theme</button>
  </div>

  <div class="ps-topbar" id="topbar"></div>

  <div class="ps-tabs" id="tabs" role="tablist" aria-label="Dashboard sections"></div>

  <div id="panel-findings" role="tabpanel" aria-labelledby="tab-findings">
    <div class="ps-banner" id="trim-banner" style="display: none;"></div>
    <input type="search" class="ps-search" id="findings-search" placeholder="Filter findings by type, service, endpoint or template..." aria-label="Filter findings" />
    <div class="ps-metrics" id="findings-metrics"></div>
    <div class="ps-filters" id="findings-filters"></div>
    <div class="ps-panel-toolbar">
      <button type="button" class="ps-export-btn" id="findings-export" data-export-tab="findings">Export CSV</button>
      <button type="button" class="ps-copy-link-btn" id="findings-copy-link" data-copy-link-tab="findings">Copy link</button>
    </div>
    <div class="ps-list" id="findings-list"></div>
    <button type="button" class="ps-show-more" id="findings-show-more" style="display: none;"></button>
    <div class="ps-empty" id="findings-empty" style="display: none;">No findings in this trace set.</div>
  </div>

  <div id="panel-explain" role="tabpanel" aria-labelledby="tab-explain" style="display: none;">
    <div class="ps-empty" id="explain-empty">Click a finding to view its trace tree here.</div>
    <div id="explain-content" style="display: none;">
      <div class="ps-tree-header" id="explain-breadcrumb"></div>
      <div class="ps-tree" id="explain-tree"></div>
      <div class="ps-drill" id="explain-fix" style="display: none;"></div>
    </div>
    <div class="ps-empty" id="explain-not-embedded" style="display: none;"></div>
  </div>

  <div id="panel-pgstat" role="tabpanel" aria-labelledby="tab-pgstat" style="display: none;">
    <div class="ps-drill" id="pgstat-drill" style="display: none;">
      <div class="ps-drill-label">Filtered from Explain</div>
      <span id="pgstat-drill-text"></span>
      <span class="ps-drill-clear" id="pgstat-drill-clear">clear</span>
    </div>
    <div class="ps-filters" id="pgstat-rankings"></div>
    <input type="search" class="ps-search" id="pgstat-search" placeholder="Filter by SQL template..." aria-label="Filter pg_stat rows" />
    <div class="ps-panel-toolbar">
      <button type="button" class="ps-export-btn" id="pgstat-export" data-export-tab="pgstat">Export CSV</button>
      <button type="button" class="ps-copy-link-btn" id="pgstat-copy-link" data-copy-link-tab="pgstat">Copy link</button>
    </div>
    <table class="ps-table" id="pgstat-table">
      <thead><tr><th>Template</th><th style="width: 80px;">Calls</th><th style="width: 100px;">Total ms</th><th style="width: 90px;">Mean ms</th></tr></thead>
      <tbody id="pgstat-body"></tbody>
    </table>
    <div class="ps-empty" id="pgstat-empty" style="display: none;">No pg_stat entries.</div>
  </div>

  <div id="panel-diff" role="tabpanel" aria-labelledby="tab-diff" style="display: none;">
    <input type="search" class="ps-search" id="diff-search" placeholder="Filter diff findings by type, service, endpoint or template..." aria-label="Filter diff findings" />
    <div class="ps-panel-toolbar">
      <button type="button" class="ps-export-btn" id="diff-export" data-export-tab="diff">Export CSV</button>
      <button type="button" class="ps-copy-link-btn" id="diff-copy-link" data-copy-link-tab="diff">Copy link</button>
    </div>
    <div class="ps-diff-section">
      <div class="ps-diff-section-header red" id="diff-new-header">New findings (0)</div>
      <div class="ps-list" id="diff-new-list"></div>
    </div>
    <div class="ps-diff-section">
      <div class="ps-diff-section-header green" id="diff-resolved-header">Resolved findings (0)</div>
      <div class="ps-list" id="diff-resolved-list"></div>
    </div>
    <div class="ps-diff-section">
      <div class="ps-diff-section-header" id="diff-sev-header">Severity changes (0)</div>
      <table class="ps-table" id="diff-sev-table" style="display: none;">
        <thead><tr><th>Type</th><th>Service</th><th>Endpoint</th><th>Before</th><th>After</th></tr></thead>
        <tbody id="diff-sev-body"></tbody>
      </table>
    </div>
    <div class="ps-diff-section">
      <div class="ps-diff-section-header" id="diff-endp-header">Endpoint metric deltas (0)</div>
      <table class="ps-table" id="diff-endp-table" style="display: none;">
        <thead><tr><th>Service</th><th>Endpoint</th><th>Before I/O</th><th>After I/O</th><th>Delta</th></tr></thead>
        <tbody id="diff-endp-body"></tbody>
      </table>
    </div>
  </div>

  <div id="panel-correlations" role="tabpanel" aria-labelledby="tab-correlations" style="display: none;">
    <input type="search" class="ps-search" id="correlations-search" placeholder="Filter correlations by service or type..." aria-label="Filter correlations" />
    <div class="ps-panel-toolbar">
      <button type="button" class="ps-export-btn" id="correlations-export" data-export-tab="correlations">Export CSV</button>
      <button type="button" class="ps-copy-link-btn" id="correlations-copy-link" data-copy-link-tab="correlations">Copy link</button>
    </div>
    <div class="ps-list" id="correlations-list"></div>
  </div>

  <div id="panel-green" role="tabpanel" aria-labelledby="tab-green" style="display: none;">
    <div class="ps-metrics ps-metrics-3" id="green-metrics"></div>
    <div class="ps-tree-header" id="green-regions-header" style="margin-top: 14px;"></div>
    <table class="ps-table" id="green-regions-table" style="display: none;">
      <thead><tr><th>Region</th><th>Intensity (gCO2/kWh)</th><th>I/O ops</th><th>CO2</th><th>Source</th></tr></thead>
      <tbody id="green-regions-body"></tbody>
    </table>
    <div class="ps-empty" id="green-regions-empty" style="display: none;">No region breakdown available.</div>
  </div>

  <div class="ps-footer">
    <span class="ps-kbd">j</span>/<span class="ps-kbd">k</span> navigate . <span class="ps-kbd">enter</span> open . <span class="ps-kbd">/</span> search . <span class="ps-kbd">esc</span> back . <span class="ps-kbd">?</span> shortcuts
  </div>
  <div class="ps-credit">
    Powered by <a href="https://github.com/robintra/perf-sentinel" target="_blank" rel="noopener noreferrer">perf-sentinel</a>
  </div>
</div>

<dialog id="cheatsheet" class="ps-modal" aria-labelledby="cheatsheet-title">
  <button type="button" class="ps-modal-close" id="cheatsheet-close" aria-label="Close">x</button>
  <h2 id="cheatsheet-title">Keyboard shortcuts</h2>
  <table id="cheatsheet-table">
    <thead><tr><th scope="col">Key</th><th scope="col">Action</th></tr></thead>
    <tbody id="cheatsheet-body"></tbody>
  </table>
</dialog>

<script id="report-data" type="application/json">
{{REPORT_JSON}}
</script>

<script>
(function () {
  "use strict";

  // -------- persistence (sessionStorage, scoped to this browser tab) --------
  // sessionStorage throws in Safari private mode and some enterprise
  // policies. Every access is wrapped so a failure degrades gracefully
  // to in-memory defaults rather than surfacing a runtime error.
  var STORAGE_KEYS = {
    theme: "perf-sentinel:theme",
    pgstatRanking: "perf-sentinel:pgstat-ranking"
  };
  function sessionGet(key) {
    try {
      return globalThis.sessionStorage.getItem(key);
    } catch {
      // Safari private mode or a locked-down enterprise policy:
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    }
  }
  function sessionSet(key, value) {
    try {
      globalThis.sessionStorage.setItem(key, value);
    } catch {
      // See sessionGet: silent fallback is the intended posture.
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    }
  }
  // -------- theme (tri-state: auto | dark | light) --------
  // "auto" follows prefers-color-scheme live. Legacy "dark"/"light"
  // sessions keep their forced modes. Applied before DOM render so
  // the body background does not flash.
  var THEME_MODES = ["auto", "dark", "light"];
  var prefersDarkMQ = null;
  try {
    prefersDarkMQ = globalThis.matchMedia
      ? globalThis.matchMedia("(prefers-color-scheme: dark)")
      : null;
  } catch {
    prefersDarkMQ = null;
  }
  function currentThemeMode() {
    var stored = sessionGet(STORAGE_KEYS.theme);
    return THEME_MODES.includes(stored) ? stored : "auto";
  }
  function resolveThemeColor(mode) {
    if (mode === "dark" || mode === "light") return mode;
    return prefersDarkMQ && prefersDarkMQ.matches ? "dark" : "light";
  }
  function applyTheme(mode) {
    document.documentElement.dataset.theme = resolveThemeColor(mode);
    var btn = document.getElementById("theme-toggle");
    if (btn) btn.textContent = "Theme: " + mode;
  }
  applyTheme(currentThemeMode());
  if (prefersDarkMQ && typeof prefersDarkMQ.addEventListener === "function") {
    try {
      prefersDarkMQ.addEventListener("change", function () {
        if (currentThemeMode() === "auto") applyTheme("auto");
      });
    } catch {
      // Older browsers expose addListener instead, not worth wiring.
    }
  }

  // -------- load payload --------
  function loadPayload() {
    var raw = document.getElementById("report-data").textContent || "";
    try {
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    } catch (e) {
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    }
  }
  function indexTracesById(list) {
    // Null-prototype map so a hostile trace_id like "__proto__" or
    // "toString" cannot corrupt the lookup by reparenting Object's
    // prototype chain. Not currently exploitable to code execution
    // (downstream consumption is textContent-only), but the fix is
    // a one-liner and removes the family of defects.
    var map = Object.create(null);
    list.forEach(function (trace) { map[trace.trace_id] = trace; });
    return map;
  }

  var payload = loadPayload();
  if (!payload) return;

  var report = payload.report || {};
  var findings = report.findings || [];
  var greenSummary = report.green_summary || null;
  var hasGreen = !!(greenSummary && greenSummary.co2);
  var embeddedTraces = payload.embedded_traces || [];
  var tracesById = indexTracesById(embeddedTraces);

  // -------- small DOM helpers (textContent only) --------
  function el(tag, cls, text) {
    var n = document.createElement(tag);
    if (cls) n.className = cls;
    if (text !== undefined && text !== null) n.textContent = String(text);
    return n;
  }
  function setAttr(node, name, value) { node.setAttribute(name, String(value)); }
  function safeHttpsHref(url) {
    if (typeof url !== "string") return null;
    if (!url.startsWith("https://")) return null;
    return url;
  }
  /// Reusable metric card builder. Hoisted to the outer scope so it is
  /// not re-created on every render of `renderFindingsMetrics` and
  /// `renderGreenPanel` (Sonar S7721).
  function metricCard(label, value, sub, smallValue) {
    var wrap = el("div", "ps-metric");
    wrap.appendChild(el("div", "ps-metric-label", label));
    var v = el("div", "ps-metric-value", value);
    if (smallValue) v.classList.add("ps-metric-value-sm");
    wrap.appendChild(v);
    wrap.appendChild(el("div", "ps-metric-sub", sub));
    return wrap;
  }

  // -------- formatters --------
  function formatGco2(grams) {
    if (!Number.isFinite(grams)) return "-";
    var abs = Math.abs(grams);
    if (abs >= 1) return grams.toFixed(3) + " g";
    if (abs >= 0.001) return (grams * 1000).toFixed(3) + " mg";
    if (abs >= 0.000001) return (grams * 1000000).toFixed(3) + " ug";
    if (abs === 0) return "0 g";
    return grams.toExponential(2) + " g";
  }
  function formatDurationUs(us) {
    if (!Number.isFinite(us)) return "-";
    var ms = us / 1000;
    if (ms < 1) return ms.toFixed(2) + " ms";
    if (ms < 10) return ms.toFixed(2) + " ms";
    return Math.round(ms) + " ms";
  }
  function truncate(s, max) {
    if (typeof s !== "string") return "";
    if (s.length <= max) return s;
    return s.slice(0, max - 1) + "...";
  }
  function percent(num, denom) {
    if (!denom) return "0%";
    return Math.round((num * 100) / denom) + "%";
  }

  // severity + finding-type display maps
  var SEV_CLASS = { critical: "ps-sev-crit", warning: "ps-sev-warn", info: "ps-sev-info" };
  var SEV_LABEL = { critical: "CRIT", warning: "WARN", info: "INFO" };
  var TYPE_LABEL = {
    n_plus_one_sql: "N+1 SQL",
    n_plus_one_http: "N+1 HTTP",
    redundant_sql: "Redundant SQL",
    redundant_http: "Redundant HTTP",
    slow_sql: "Slow SQL",
    slow_http: "Slow HTTP",
    excessive_fanout: "Excessive fanout",
    chatty_service: "Chatty service",
    pool_saturation: "Pool saturation",
    serialized_calls: "Serialized calls"
  };
  function typeLabel(t) { return TYPE_LABEL[t] || String(t); }

  // -------- top bar --------
  function renderTopbar() {
    var bar = document.getElementById("topbar");
    var brand = el("span", "ps-brand", "perf-sentinel");
    var version = el("span", "ps-meta", "v" + (payload.version || ""));
    var analysis = report.analysis || { events_processed: 0, traces_analyzed: 0 };
    var meta = el(
      "span",
      "ps-meta",
      (payload.input_label || "-") +
        " . " + analysis.traces_analyzed + " traces" +
        " . " + analysis.events_processed + " spans"
    );
    var gate = report.quality_gate || { passed: true };
    var badge = el(
      "span",
      gate.passed ? "ps-gate-pass" : "ps-gate-fail",
      gate.passed ? "Quality gate passed" : "Quality gate failed"
    );
    bar.appendChild(brand);
    bar.appendChild(version);
    bar.appendChild(meta);
    bar.appendChild(badge);
  }

  // -------- tabs (generic) --------
  var tabs = [];
  // Used by g-prefixed shortcuts and deep-link hash application to bail
  // out silently when a tab is not present in the current report.
  var registeredTabs = Object.create(null);
  function registerTab(key, label, countFn) {
    tabs.push({ key: key, label: label, countFn: countFn });
    registeredTabs[key] = true;
  }
  function tabIsRegistered(key) { return !!registeredTabs[key]; }
  function renderTabs() {
    var bar = document.getElementById("tabs");
    tabs.forEach(function (t) {
      var btn = el("button", "ps-tab", t.label);
      btn.type = "button";
      // ARIA tab pattern: each button is a `role="tab"` that controls
      // its tabpanel. tabindex rotates between 0 (active) and -1
      // (inactive) so keyboard users traverse the tablist exactly once
      // when tabbing through the page, then use arrow keys inside.
      setAttr(btn, "role", "tab");
      setAttr(btn, "data-tab", t.key);
      setAttr(btn, "id", "tab-" + t.key);
      setAttr(btn, "aria-controls", "panel-" + t.key);
      setAttr(btn, "aria-selected", "false");
      setAttr(btn, "tabindex", "-1");
      if (t.countFn) {
        var c = t.countFn();
        if (c !== null && c !== undefined) {
          var badge = el("span", "ps-badge", String(c));
          btn.appendChild(document.createTextNode(" "));
          btn.appendChild(badge);
        }
      }
      btn.addEventListener("click", function () { switchTab(t.key); });
      bar.appendChild(btn);
    });
    wireTablistKeyboardNav(bar);
    // default to first tab
    if (tabs.length > 0) switchTab(tabs[0].key);
  }

  function wireTablistKeyboardNav(bar) {
    // WAI-ARIA arrow-key pattern on the tablist. Coexists with the
    // g-prefixed shortcuts since they listen on different keys.
    bar.addEventListener("keydown", function (event) {
      var target = event.target;
      if (!target || target.getAttribute("role") !== "tab") return;
      var buttons = Array.prototype.slice.call(
        bar.querySelectorAll("button[role=\"tab\"]")
      );
      if (buttons.length === 0) return;
      var idx = buttons.indexOf(target);
      if (idx < 0) return;

      var next = -1;
      switch (event.key) {
        case "ArrowRight":
        case "ArrowDown":
          next = (idx + 1) % buttons.length;
          break;
        case "ArrowLeft":
        case "ArrowUp":
          next = (idx - 1 + buttons.length) % buttons.length;
          break;
        case "Home":
          next = 0;
          break;
        case "End":
          next = buttons.length - 1;
          break;
        case "Enter":
        case " ":
          event.preventDefault();
          switchTab(target.dataset.tab, true);
          return;
        default:
          return;
      }
      event.preventDefault();
      var targetBtn = buttons[next];
      if (targetBtn) {
        targetBtn.focus();
        switchTab(targetBtn.dataset.tab, true);
      }
    });
  }

  var currentTab = null;
  function switchTab(key, fromKeyboard) {
    // Clear open search filters so a stale one does not resurface
    // when the user comes back to a tab.
    if (typeof clearAllSearchFilters === "function") clearAllSearchFilters();
    currentTab = key;
    document.querySelectorAll(".ps-tab").forEach(function (btn) {
      var active = btn.dataset.tab === key;
      btn.classList.toggle("active", active);
      setAttr(btn, "aria-selected", active ? "true" : "false");
      setAttr(btn, "tabindex", active ? "0" : "-1");
    });
    tabs.forEach(function (t) {
      var panel = document.getElementById("panel-" + t.key);
      if (panel) panel.style.display = t.key === key ? "" : "none";
    });
    // Move focus only for keyboard activation. Clicks and hash
    // restoration must not steal focus.
    if (fromKeyboard) {
      var active = document.getElementById("tab-" + key);
      if (active && typeof active.focus === "function") {
        try { active.focus(); } catch { /* detached node */ }
      }
    }
    scheduleHashWrite();
  }

  // -------- findings metrics --------
  function countBySeverity() {
    var c = { critical: 0, warning: 0, info: 0 };
    findings.forEach(function (f) { if (c[f.severity] !== undefined) c[f.severity] += 1; });
    return c;
  }
  function renderFindingsMetrics() {
    var root = document.getElementById("findings-metrics");
    var sev = countBySeverity();
    var total = findings.length;

    root.appendChild(metricCard(
      "Findings",
      String(total),
      sev.critical + " crit . " + sev.warning + " warn . " + sev.info + " info"
    ));

    var avoidable = greenSummary ? (greenSummary.avoidable_io_ops || 0) : 0;
    var ratio = greenSummary ? Math.round((greenSummary.io_waste_ratio || 0) * 100) : 0;
    root.appendChild(metricCard(
      "Avoidable I/O",
      String(avoidable),
      ratio + "% waste ratio"
    ));

    if (hasGreen) {
      var co2 = greenSummary.co2;
      root.appendChild(metricCard(
        "CO2 estimate",
        formatGco2(co2.total.mid),
        String(co2.total.model || "")
      ));
    }

    var offender = greenSummary && greenSummary.top_offenders && greenSummary.top_offenders[0];
    if (offender) {
      root.appendChild(metricCard(
        "Top offender",
        truncate(offender.service, 24),
        "IIS " + (offender.io_intensity_score || 0).toFixed(1),
        true
      ));
    }
  }

  // -------- filters --------
  var filterState = { severity: null, service: null };
  function renderFilterChips() {
    var root = document.getElementById("findings-filters");
    root.textContent = "";

    // Severity chips (All / Critical / Warning) behave as a single
    // mutually-exclusive selector, so they go inside a radiogroup.
    // Service chips are independent toggles: each one is pressable and
    // can be cleared by re-clicking, but they don't form a group in
    // the ARIA sense.
    var severityGroup = el("span", "ps-chip-group", null);
    setAttr(severityGroup, "role", "radiogroup");
    setAttr(severityGroup, "aria-label", "Finding severity");
    root.appendChild(severityGroup);

    var serviceGroup = el("span", "ps-chip-group", null);
    setAttr(serviceGroup, "role", "group");
    setAttr(serviceGroup, "aria-label", "Finding service");
    root.appendChild(serviceGroup);

    function appendChip(parent, label, key, chipRole, stateAttr) {
      var btn = el("button", "ps-chip", label);
      btn.type = "button";
      setAttr(btn, "role", chipRole);
      setAttr(btn, "data-key", key);
      setAttr(btn, stateAttr, "false");
      btn.addEventListener("click", function () { onFilterClick(key); });
      parent.appendChild(btn);
    }

    appendChip(severityGroup, "All", "all", "radio", "aria-checked");
    var hasCrit = findings.some(function (f) { return f.severity === "critical"; });
    var hasWarn = findings.some(function (f) { return f.severity === "warning"; });
    if (hasCrit) appendChip(severityGroup, "Critical", "sev:critical", "radio", "aria-checked");
    if (hasWarn) appendChip(severityGroup, "Warning", "sev:warning", "radio", "aria-checked");

    var services = Object.create(null);
    findings.forEach(function (f) { services[f.service] = true; });
    Object.keys(services).sort().forEach(function (s) {
      appendChip(serviceGroup, s, "svc:" + s, "button", "aria-pressed");
    });

    syncFilterChips();
  }
  function onFilterClick(key) {
    if (key === "all") {
      filterState.severity = null;
      filterState.service = null;
    } else if (key.startsWith("sev:")) {
      var sv = key.slice(4);
      filterState.severity = filterState.severity === sv ? null : sv;
    } else if (key.startsWith("svc:")) {
      var svc = key.slice(4);
      filterState.service = filterState.service === svc ? null : svc;
    }
    syncFilterChips();
    resetShownCount();
    renderFindingsList();
    scheduleHashWrite();
  }
  function syncFilterChips() {
    var anyActive = !!(filterState.severity || filterState.service);
    document.querySelectorAll("#findings-filters .ps-chip").forEach(function (chip) {
      var key = chip.dataset.key;
      var active = false;
      if (key === "all") active = !anyActive;
      else if (key === "sev:" + filterState.severity) active = true;
      else if (key === "svc:" + filterState.service) active = true;
      chip.classList.toggle("active", active);
      // Severity chips and "All" are radio-role, service chips are
      // toggle buttons. Pick the right ARIA state attribute per chip.
      var role = chip.getAttribute("role");
      var stateAttr = role === "radio" ? "aria-checked" : "aria-pressed";
      setAttr(chip, stateAttr, active ? "true" : "false");
    });
  }

  // -------- findings list --------
  // Cap the initial render at LIST_CAP rows to keep the DOM small.
  // Additional rows are revealed LIST_CAP at a time via the
  // `findings-show-more` button, tracked by `shownCount`. Every filter,
  // search or hash apply resets `shownCount` to LIST_CAP so the user
  // never ends up paginated into rows that no longer match.
  var LIST_CAP = 500;
  var visibleFindings = [];
  var selectedIndex = -1;
  var shownCount = LIST_CAP;

  function applyFilters() {
    return findings.filter(function (f) {
      if (filterState.severity && f.severity !== filterState.severity) return false;
      if (filterState.service && f.service !== filterState.service) return false;
      return true;
    });
  }

  function renderFindingsList() {
    var root = document.getElementById("findings-list");
    var empty = document.getElementById("findings-empty");
    root.textContent = "";
    var filtered = applyFilters();
    visibleFindings = filtered.slice(0, shownCount);
    selectedIndex = visibleFindings.length > 0 ? 0 : -1;

    if (visibleFindings.length === 0) {
      empty.style.display = "";
      syncShowMore(filtered.length);
      return;
    }
    empty.style.display = "none";

    visibleFindings.forEach(function (f, idx) {
      root.appendChild(buildFindingRow(f, idx));
    });
    syncSelection();
    syncShowMore(filtered.length);
  }

  function syncShowMore(totalMatching) {
    var btn = document.getElementById("findings-show-more");
    if (!btn) return;
    if (visibleFindings.length >= totalMatching) {
      btn.style.display = "none";
      return;
    }
    var remaining = totalMatching - visibleFindings.length;
    var next = Math.min(LIST_CAP, remaining);
    btn.style.display = "";
    btn.textContent = "Show " + next + " more findings (" + remaining + " remaining)";
  }

  function resetShownCount() { shownCount = LIST_CAP; }

  function buildFindingRow(f, idx) {
    var row = el("div", "ps-row");
    setAttr(row, "data-idx", idx);

    var sev = el("div", SEV_CLASS[f.severity] || "ps-sev-info", SEV_LABEL[f.severity] || "INFO");
    row.appendChild(sev);

    var main = el("div", "ps-fin-main");
    var typeRow = el("div", "ps-fin-type");
    typeRow.appendChild(document.createTextNode(typeLabel(f.type || f.finding_type)));
    var svc = el("span", "ps-fin-service", " in " + (f.service || "-"));
    typeRow.appendChild(svc);
    main.appendChild(typeRow);

    var tpl = (f.pattern && f.pattern.template) || "";
    main.appendChild(el("div", "ps-fin-detail", tpl));
    row.appendChild(main);

    var right = el("div", "ps-fin-right");
    var occ = (f.pattern && f.pattern.occurrences) || 0;
    right.appendChild(document.createTextNode(occ + " occ"));
    right.appendChild(document.createElement("br"));
    right.appendChild(el("span", "ps-fin-right-sub", truncate(f.source_endpoint || "-", 48)));
    row.appendChild(right);

    row.addEventListener("click", function () {
      selectedIndex = idx;
      syncSelection();
      openExplain(f);
    });
    return row;
  }

  function syncSelection() {
    document.querySelectorAll("#findings-list .ps-row").forEach(function (row, idx) {
      row.classList.toggle("selected", idx === selectedIndex);
    });
  }

  // -------- explain tree --------
  // Shared empty state for cap-reached, resolved-diff, and
  // Correlations clickthroughs whose trace is not in embedded_traces.
  function renderExplainEmpty(message) {
    document.getElementById("explain-empty").style.display = "none";
    var content = document.getElementById("explain-content");
    var notEmbedded = document.getElementById("explain-not-embedded");
    content.style.display = "none";
    notEmbedded.style.display = "";
    notEmbedded.textContent = message;
    switchTab("explain");
  }

  function openExplain(f) {
    document.getElementById("explain-empty").style.display = "none";
    var content = document.getElementById("explain-content");
    var notEmbedded = document.getElementById("explain-not-embedded");
    notEmbedded.style.display = "none";
    notEmbedded.textContent = "";

    var trace = tracesById[f.trace_id];
    if (!trace) {
      // Happens when the finding's trace was dropped by the size cap.
      renderExplainEmpty(
        "Trace not embedded (cap reached). Rerun with --max-traces-embedded <higher> to include it."
      );
      return;
    }

    content.style.display = "";
    var breadcrumb = document.getElementById("explain-breadcrumb");
    var shortTraceId = (f.trace_id || "").slice(0, 12);
    breadcrumb.textContent =
      "trace_id = " + shortTraceId + " . " + (f.service || "-") + " . " + (f.source_endpoint || "-");

    var treeRoot = document.getElementById("explain-tree");
    treeRoot.textContent = "";
    renderTree(treeRoot, trace, f);

    var fix = document.getElementById("explain-fix");
    fix.textContent = "";
    if (f.suggested_fix) {
      fix.style.display = "";
      renderSuggestedFix(fix, f.suggested_fix);
    } else {
      fix.style.display = "none";
    }

    switchTab("explain");
  }

  /// Build the parent -> children adjacency for a span list plus the
  /// roots array. Extracted from `renderTree` to keep its cognitive
  /// complexity under Sonar's 15-point threshold.
  function buildSpanTree(spans) {
    // Null-prototype maps for all user-controlled keys (span_id,
    // parent_span_id) so hostile identifiers like "__proto__" cannot
    // corrupt the lookup chain. Mirrors the indexTracesById fix.
    var byId = Object.create(null);
    spans.forEach(function (s) { byId[s.span_id] = s; });
    var childrenByParent = Object.create(null);
    var roots = [];
    spans.forEach(function (s, idx) {
      var parent = s.parent_span_id;
      if (parent && byId[parent]) {
        if (!childrenByParent[parent]) childrenByParent[parent] = [];
        childrenByParent[parent].push(idx);
      } else {
        roots.push(idx);
      }
    });
    return { roots: roots, childrenByParent: childrenByParent };
  }

  /// Iterative DFS walker that appends one row per span. Depth is
  /// capped at 64 to cut cycles if any, the total row count is capped
  /// at 2000 to bound worst-case DOM size.
  function emitSpanTreeRows(root, spans, tree, targetTpl) {
    var stack = [];
    for (var r = tree.roots.length - 1; r >= 0; r--) {
      stack.push({ idx: tree.roots[r], depth: 0 });
    }
    var emitted = 0;
    var HARD_SPAN_CAP = 2000;
    var MAX_DEPTH = 64;
    while (stack.length > 0 && emitted < HARD_SPAN_CAP) {
      var frame = stack.pop();
      if (frame.depth > MAX_DEPTH) continue;
      var span = spans[frame.idx];
      root.appendChild(buildSpanRow(span, frame.depth, targetTpl));
      emitted += 1;
      var kids = tree.childrenByParent[span.span_id] || [];
      for (var k = kids.length - 1; k >= 0; k--) {
        stack.push({ idx: kids[k], depth: frame.depth + 1 });
      }
    }
  }

  function renderTree(root, trace, finding) {
    var spans = trace.spans || [];
    if (spans.length === 0) {
      root.appendChild(el("div", "ps-span dim", "(empty trace)"));
      return;
    }
    var tree = buildSpanTree(spans);
    var targetTpl = (finding.pattern && finding.pattern.template) || null;
    emitSpanTreeRows(root, spans, tree, targetTpl);
  }

  function buildSpanRow(span, depth, targetTpl) {
    var row = el("div", "ps-span");
    var isFinding = targetTpl && span.template === targetTpl;
    if (isFinding) row.classList.add("hilite");
    else row.classList.add("dim");
    row.style.paddingLeft = (depth * 20) + "px";

    // Cross-nav to pg_stat: a SQL span whose normalized template matches
    // a row in pg_stat becomes clickable. The click switches to the
    // pg_stat tab with the matching row highlighted and the filter
    // banner shown.
    var pgStatMatch =
      hasPgStat && span.event_type === "sql" && pgStatByTemplate[span.template]
        ? span.template
        : null;
    if (pgStatMatch) {
      row.classList.add("ps-span-pgstat-link");
      row.addEventListener("click", function () {
        switchTab("pgstat");
        showPgStatDrill(pgStatMatch);
      });
    }

    var text = el("span", "ps-span-text");
    if (isFinding) text.classList.add("ps-span-find");
    text.textContent = describeSpan(span);
    row.appendChild(text);

    row.appendChild(el("span", "ps-span-dur", formatDurationUs(span.duration_us)));
    return row;
  }

  function describeSpan(span) {
    if (span.event_type === "sql") {
      return span.template || span.target || span.operation || "(sql)";
    }
    if (span.event_type === "http_out") {
      var op = (span.operation || "GET").toUpperCase();
      return op + " " + (span.template || span.target || "");
    }
    return span.operation || span.target || "(span)";
  }

  function renderSuggestedFix(root, fix) {
    var label = el("div", "ps-drill-label", "Suggested fix . " + (fix.framework || "-"));
    root.appendChild(label);
    root.appendChild(document.createTextNode(fix.recommendation || ""));
    var href = safeHttpsHref(fix.reference_url);
    if (href) {
      root.appendChild(document.createTextNode(" "));
      var a = el("a", "ps-drill-link", "See documentation");
      setAttr(a, "href", href);
      setAttr(a, "target", "_blank");
      setAttr(a, "rel", "noopener noreferrer");
      root.appendChild(a);
    }
  }

  // -------- green panel --------
  function renderGreenPanel() {
    if (!hasGreen) return;
    var co2 = greenSummary.co2;

    var metrics = document.getElementById("green-metrics");
    metrics.appendChild(metricCard(
      "Operational CO2",
      formatGco2(co2.operational_gco2),
      "low " + formatGco2(co2.total.low) + " . high " + formatGco2(co2.total.high)
    ));
    metrics.appendChild(metricCard(
      "Embodied CO2",
      formatGco2(co2.embodied_gco2),
      "SCI v1.0 M term"
    ));
    var avoidMid = co2.avoidable.mid;
    var ratio = percent(avoidMid, co2.operational_gco2);
    metrics.appendChild(metricCard(
      "Avoidable",
      formatGco2(avoidMid),
      ratio + " of operational"
    ));

    var regions = greenSummary.regions || [];
    var header = document.getElementById("green-regions-header");
    header.textContent = "Regions (" + regions.length + ")";
    if (regions.length === 0) {
      document.getElementById("green-regions-empty").style.display = "";
      return;
    }
    document.getElementById("green-regions-table").style.display = "";
    var tbody = document.getElementById("green-regions-body");
    regions.forEach(function (r) {
      var tr = document.createElement("tr");
      tr.appendChild(el("td", null, r.region || "-"));
      tr.appendChild(el("td", null, (r.grid_intensity_gco2_kwh || 0).toFixed(0)));
      tr.appendChild(el("td", null, String(r.io_ops || 0)));
      tr.appendChild(el("td", null, formatGco2(r.co2_gco2 || 0)));
      tr.appendChild(el("td", null, r.intensity_source || "-"));
      tbody.appendChild(tr);
    });
  }

  // -------- pg_stat / diff / correlations state --------
  var pgStat = payload.pg_stat || null;
  // Cross-nav lookup indexed across every ranking's entries so the
  // Explain-to-pg_stat hotlink fires regardless of which ranking the
  // user switches to.
  var pgStatByTemplate = Object.create(null);
  if (pgStat && Array.isArray(pgStat.rankings)) {
    pgStat.rankings.forEach(function (r) {
      (r.entries || []).forEach(function (entry) {
        pgStatByTemplate[entry.normalized_template] = entry;
      });
    });
  }
  var hasPgStat = Object.keys(pgStatByTemplate).length > 0;

  var diffData = payload.diff || null;
  var hasDiff = !!diffData;

  // Correlations are populated only in daemon-produced reports. The batch
  // pipeline does not emit them. This branch lights up automatically
  // when a future daemon report is fed into
  // `perf-sentinel report --input <daemon.json>`.
  var correlations =
    report.correlations && report.correlations.length > 0 ? report.correlations : [];
  var hasCorrelations = correlations.length > 0;

  // -------- pg_stat panel --------
  // Rankings stay in the stable order `rank_pg_stat` emits:
  // [by_total_time, by_calls, by_mean_time, by_io_blocks]. The
  // sub-switcher chips are built from `pgStatRankings` so new rankings
  // appended server-side surface automatically without any JS change.
  var pgStatRankings =
    pgStat && Array.isArray(pgStat.rankings) ? pgStat.rankings : [];
  var activeRankingIndex = 0;
  // Template currently highlighted by the drill banner, if any. Used
  // to decide whether to re-apply the hilite after a ranking switch.
  var pgStatHiliteTemplate = null;

  // Human-friendly chip labels for the four known rankings. Unknown
  // labels fall through to the raw server-side string so an older or
  // customized PgStatReport still renders something sensible.
  var PGSTAT_LABELS = {
    "top by total_exec_time": "Total time",
    "top by calls": "Calls",
    "top by mean_exec_time": "Mean time",
    "top by shared_blks_total": "I/O blocks"
  };

  function activePgStatEntries() {
    if (pgStatRankings.length === 0) return [];
    var idx = Math.min(activeRankingIndex, pgStatRankings.length - 1);
    return pgStatRankings[idx].entries || [];
  }

  function renderPgStatPanel() {
    if (!hasPgStat) {
      document.getElementById("pgstat-empty").style.display = "";
      return;
    }
    renderPgStatRankings();
    renderPgStatTable();
  }

  function renderPgStatRankings() {
    var root = document.getElementById("pgstat-rankings");
    root.textContent = "";
    if (pgStatRankings.length <= 1) {
      // Hide the chip row when there is nothing to switch between.
      root.style.display = "none";
      return;
    }
    root.style.display = "";
    // Mutually-exclusive chip group. ARIA radiogroup pattern: the
    // container carries role="radiogroup", each chip is role="radio"
    // with aria-checked rewritten on every selection.
    setAttr(root, "role", "radiogroup");
    setAttr(root, "aria-label", "pg_stat ranking");
    pgStatRankings.forEach(function (r, idx) {
      var label = PGSTAT_LABELS[r.label] || r.label || ("Ranking " + (idx + 1));
      var btn = el("button", "ps-chip", label);
      btn.type = "button";
      setAttr(btn, "role", "radio");
      setAttr(btn, "data-ranking-index", String(idx));
      var isActive = idx === activeRankingIndex;
      setAttr(btn, "aria-checked", isActive ? "true" : "false");
      if (isActive) btn.classList.add("active");
      btn.addEventListener("click", function () {
        selectPgStatRanking(idx);
      });
      root.appendChild(btn);
    });
  }

  function selectPgStatRanking(idx) {
    // Persist the choice even when idx already matches activeRankingIndex.
    // This covers the deep-link restore path where the hash carries the
    // current ranking but sessionStorage was empty, so we still honor
    // the user's implicit intent to remember this ranking.
    sessionSet(STORAGE_KEYS.pgstatRanking, rankingSlugForIndex(idx));
    if (idx === activeRankingIndex) return;
    activeRankingIndex = idx;
    var chips = document.querySelectorAll("#pgstat-rankings .ps-chip");
    for (var i = 0; i < chips.length; i++) {
      var isActive = i === idx;
      chips[i].classList.toggle("active", isActive);
      setAttr(chips[i], "aria-checked", isActive ? "true" : "false");
    }
    renderPgStatTable();
    scheduleHashWrite();
    // Preserve the hilite when the previously-hilited template exists
    // in the new ranking; else silently clear the drill + hilite.
    if (pgStatHiliteTemplate) {
      var stillPresent = activePgStatEntries().some(function (entry) {
        return entry.normalized_template === pgStatHiliteTemplate;
      });
      if (stillPresent) {
        highlightPgStatRow(pgStatHiliteTemplate);
      } else {
        clearPgStatDrill();
      }
    }
    // Re-apply the search filter against the new rowset. Null-guard
    // covers the boot path where the filter init has not run yet.
    if (SEARCHABLE_TABS && SEARCHABLE_TABS.pgstat) {
      applySearchFilter(SEARCHABLE_TABS.pgstat);
    }
  }

  function renderPgStatTable() {
    var body = document.getElementById("pgstat-body");
    body.textContent = "";
    activePgStatEntries().forEach(function (entry) {
      var tr = document.createElement("tr");
      setAttr(tr, "data-template", entry.normalized_template);
      tr.appendChild(el("td", null, entry.normalized_template));
      tr.appendChild(el("td", null, String(entry.calls || 0)));
      tr.appendChild(el("td", null, (entry.total_exec_time_ms || 0).toFixed(1)));
      tr.appendChild(el("td", null, (entry.mean_exec_time_ms || 0).toFixed(2)));
      body.appendChild(tr);
    });
  }

  function showPgStatDrill(template) {
    var drill = document.getElementById("pgstat-drill");
    var txt = document.getElementById("pgstat-drill-text");
    drill.style.display = "";
    txt.textContent = template;
    pgStatHiliteTemplate = template;
    highlightPgStatRow(template);
  }
  function clearPgStatDrill() {
    document.getElementById("pgstat-drill").style.display = "none";
    pgStatHiliteTemplate = null;
    document.querySelectorAll("#pgstat-body tr").forEach(function (row) {
      row.classList.remove("hilite");
    });
  }
  function highlightPgStatRow(template) {
    var matched = null;
    document.querySelectorAll("#pgstat-body tr").forEach(function (row) {
      if (row.dataset.template === template) {
        row.classList.add("hilite");
        matched = row;
      } else {
        row.classList.remove("hilite");
      }
    });
    if (matched) matched.scrollIntoView({ block: "nearest" });
  }

  // -------- diff panel --------
  function renderDiffPanel() {
    if (!hasDiff) return;
    renderDiffFindingsList(
      "diff-new-list",
      "diff-new-header",
      "New findings",
      diffData.new_findings || [],
      true
    );
    renderDiffFindingsList(
      "diff-resolved-list",
      "diff-resolved-header",
      "Resolved findings",
      diffData.resolved_findings || [],
      "resolved"
    );
    renderDiffSevTable(diffData.severity_changes || []);
    renderDiffEndpTable(diffData.endpoint_metric_deltas || []);
  }
  function renderDiffFindingsList(listId, headerId, label, items, kind) {
    var list = document.getElementById(listId);
    var hdr = document.getElementById(headerId);
    hdr.textContent = label + " (" + items.length + ")";
    list.textContent = "";
    items.forEach(function (f) {
      list.appendChild(buildDiffFindingRow(f, kind));
    });
  }
  function buildDiffFindingRow(f, kind) {
    var row = el("div", "ps-row");
    row.appendChild(
      el("div", SEV_CLASS[f.severity] || "ps-sev-info", SEV_LABEL[f.severity] || "INFO")
    );
    var main = el("div", "ps-fin-main");
    var typeRow = el("div", "ps-fin-type");
    typeRow.appendChild(document.createTextNode(typeLabel(f.type || f.finding_type)));
    typeRow.appendChild(el("span", "ps-fin-service", " in " + (f.service || "-")));
    main.appendChild(typeRow);
    main.appendChild(el("div", "ps-fin-detail", (f.pattern && f.pattern.template) || ""));
    row.appendChild(main);
    var right = el("div", "ps-fin-right");
    right.appendChild(document.createTextNode(((f.pattern && f.pattern.occurrences) || 0) + " occ"));
    right.appendChild(document.createElement("br"));
    right.appendChild(el("span", "ps-fin-right-sub", truncate(f.source_endpoint || "-", 48)));
    row.appendChild(right);
    if (kind === "resolved") {
      // Resolved findings have no trace in the current run. Route the
      // click through the shared empty-state helper so the user ends
      // up on Explain with a clear explanation rather than on an
      // empty panel.
      row.addEventListener("click", function () {
        renderExplainEmpty(
          "This finding was resolved. Its trace lives in the baseline report, not in the current run. Open the baseline report separately to explore its traces."
        );
      });
    } else if (kind === true || kind === "new") {
      row.addEventListener("click", function () {
        openExplain(f);
      });
    } else {
      row.style.cursor = "default";
    }
    return row;
  }
  function renderDiffSevTable(items) {
    var hdr = document.getElementById("diff-sev-header");
    var tbl = document.getElementById("diff-sev-table");
    var body = document.getElementById("diff-sev-body");
    hdr.textContent = "Severity changes (" + items.length + ")";
    body.textContent = "";
    if (items.length === 0) {
      tbl.style.display = "none";
      return;
    }
    tbl.style.display = "";
    items.forEach(function (c) {
      var f = c.finding || {};
      var tr = document.createElement("tr");
      tr.appendChild(el("td", null, typeLabel(f.type || f.finding_type)));
      tr.appendChild(el("td", null, f.service || "-"));
      tr.appendChild(el("td", null, f.source_endpoint || "-"));
      tr.appendChild(el("td", null, SEV_LABEL[c.before_severity] || String(c.before_severity)));
      tr.appendChild(el("td", null, SEV_LABEL[c.after_severity] || String(c.after_severity)));
      body.appendChild(tr);
    });
  }
  function renderDiffEndpTable(items) {
    var hdr = document.getElementById("diff-endp-header");
    var tbl = document.getElementById("diff-endp-table");
    var body = document.getElementById("diff-endp-body");
    hdr.textContent = "Endpoint metric deltas (" + items.length + ")";
    body.textContent = "";
    if (items.length === 0) {
      tbl.style.display = "none";
      return;
    }
    tbl.style.display = "";
    items.forEach(function (d) {
      var tr = document.createElement("tr");
      tr.appendChild(el("td", null, d.service || "-"));
      tr.appendChild(el("td", null, d.endpoint || "-"));
      tr.appendChild(el("td", null, String(d.before_io_ops || 0)));
      tr.appendChild(el("td", null, String(d.after_io_ops || 0)));
      var delta = d.delta || 0;
      tr.appendChild(el("td", null, (delta > 0 ? "+" : "") + String(delta)));
      body.appendChild(tr);
    });
  }

  // -------- correlations panel --------
  // Renders `CrossTraceCorrelation` entries emitted by the daemon,
  // matching the Rust struct shape: `source` and `target` are
  // `CorrelationEndpoint { finding_type, service, template }`,
  // timing is `median_lag_ms` and `co_occurrence_count`.
  function renderCorrelationsPanel() {
    if (!hasCorrelations) return;
    var list = document.getElementById("correlations-list");
    list.textContent = "";
    correlations.forEach(function (c) {
      var src = c.source || {};
      var tgt = c.target || {};
      var row = el("div", "ps-row ps-correlation-row");
      var leftLabel =
        (src.service || "?") + ":" + typeLabel(src.finding_type || "?");
      var rightLabel =
        (tgt.service || "?") + ":" + typeLabel(tgt.finding_type || "?");
      var main = el("div", "ps-fin-main");
      main.appendChild(el("div", "ps-fin-type", leftLabel + " -> " + rightLabel));
      var conf = Math.round((c.confidence || 0) * 100);
      var lag = (c.median_lag_ms || 0).toFixed(0);
      main.appendChild(
        el(
          "div",
          "ps-fin-detail",
          "confidence " + conf + "% . median lag " + lag + " ms"
        )
      );
      row.appendChild(el("div", "ps-sev-info", "CORR"));
      row.appendChild(main);
      row.appendChild(
        el("div", "ps-fin-right", String(c.co_occurrence_count || 0) + "x")
      );
      // Daemon-produced correlations carry sample_trace_id. When set,
      // clicking jumps to Explain. openExplain falls back to the
      // shared empty state when the trace is not embedded.
      if (c.sample_trace_id) {
        row.classList.add("ps-correlation-clickable");
        row.addEventListener("click", function () {
          openExplain(syntheticFindingFromCorrelation(c));
        });
      } else {
        row.style.cursor = "default";
      }
      list.appendChild(row);
    });
  }

  function syntheticFindingFromCorrelation(c) {
    // Minimum shape openExplain reads: trace_id plus the fields used
    // by the breadcrumb.
    var tgt = c.target || {};
    return {
      trace_id: c.sample_trace_id,
      service: tgt.service || "-",
      source_endpoint: "-",
      pattern: { template: tgt.template || "" }
    };
  }

  // -------- search --------
  // Filter state is cleared on tab switch. The current panel's search
  // input stays empty and hidden on activation, so switching away and
  // back resets the filter implicitly. Simple, no cross-tab carryover.
  function matchRowByText(row, q) {
    return (row.textContent || "").toLowerCase().includes(q);
  }
  var SEARCHABLE_TABS = {
    findings: {
      inputId: "findings-search",
      rowsSelector: "#findings-list .ps-row"
    },
    pgstat: {
      inputId: "pgstat-search",
      rowsSelector: "#pgstat-body tr"
    },
    diff: {
      inputId: "diff-search",
      // Filter only the two findings lists; the severity_changes and
      // endpoint_metric_deltas tables stay unfiltered (short lists).
      rowsSelector: "#diff-new-list .ps-row, #diff-resolved-list .ps-row"
    },
    correlations: {
      inputId: "correlations-search",
      rowsSelector: "#correlations-list .ps-row"
    }
  };
  function initSearchInputs() {
    Object.keys(SEARCHABLE_TABS).forEach(function (tabKey) {
      var cfg = SEARCHABLE_TABS[tabKey];
      var input = document.getElementById(cfg.inputId);
      if (!input) return;
      input.addEventListener("input", function () {
        applySearchFilter(cfg);
        scheduleHashWrite();
      });
    });
  }
  function applySearchFilter(cfg) {
    var input = document.getElementById(cfg.inputId);
    var q = (input.value || "").toLowerCase();
    document.querySelectorAll(cfg.rowsSelector).forEach(function (row) {
      row.style.display = !q || matchRowByText(row, q) ? "" : "none";
    });
  }
  function openSearchForActiveTab() {
    var cfg = SEARCHABLE_TABS[currentTab];
    if (!cfg) return;
    var input = document.getElementById(cfg.inputId);
    if (!input) return;
    input.style.display = "block";
    input.focus();
    input.select();
  }
  function closeSearch(input) {
    input.value = "";
    applySearchFilter(SEARCHABLE_TABS[currentTab]);
    input.style.display = "none";
    input.blur();
  }
  function clearAllSearchFilters() {
    Object.keys(SEARCHABLE_TABS).forEach(function (tabKey) {
      var cfg = SEARCHABLE_TABS[tabKey];
      var input = document.getElementById(cfg.inputId);
      if (!input) return;
      if (input.value) {
        input.value = "";
        applySearchFilter(cfg);
      }
      input.style.display = "none";
    });
  }

  // -------- trim banner --------
  function renderTrimBanner() {
    var t = payload.trimmed_traces;
    if (!t) return;
    var b = document.getElementById("trim-banner");
    b.style.display = "";
    b.textContent = "Showing " + t.kept + " of " + t.total +
      " traces (trimmed for file size). Rerun with --max-traces-embedded <higher> to see more.";
  }

  // -------- theme toggle --------
  // Click cycles through auto -> dark -> light -> auto. The actual
  // data-theme attribute and button label are handled by applyTheme,
  // defined above alongside the initial boot-time resolution.
  document.getElementById("theme-toggle").addEventListener("click", function () {
    var idx = THEME_MODES.indexOf(currentThemeMode());
    var next = THEME_MODES[(idx + 1) % THEME_MODES.length];
    sessionSet(STORAGE_KEYS.theme, next);
    applyTheme(next);
  });

  // -------- CSV export --------
  // Rows are assembled as arrays of cell values, then each cell is
  // RFC 4180 escaped and the joined line is written to a Blob. No DOM
  // injection involved, so this bypasses the innerHTML hazard entirely.
  function csvEscape(value) {
    if (value === null || value === undefined) return "";
    var s = String(value);
    // Formula-injection guard (OWASP CSV Injection). Excel, LibreOffice
    // and Google Sheets all interpret a cell that starts with =, +, -,
    // @ or a tab as a formula. A hostile SQL template or service name
    // that begins with one of those characters would execute on open.
    // The apostrophe prefix neutralizes the formula without losing the
    // original text: spreadsheets display the cell as-is and drop the
    // leading apostrophe, consumers that parse the CSV literally keep
    // it. Strict first-byte check: do not strip leading whitespace
    // (a leading tab is itself a formula trigger on some clients).
    if (s.length > 0 && "=+-@\t".includes(s.charAt(0))) {
      s = "'" + s;
    }
    if (s.includes(",") || s.includes("\"") ||
        s.includes("\n") || s.includes("\r")) {
      return "\"" + s.replaceAll("\"", "\"\"") + "\"";
    }
    return s;
  }
  function csvLine(cells) {
    return cells.map(csvEscape).join(",");
  }
  // Note on numeric cells: producers pass JS numbers straight through
  // csvEscape, which calls String(n). That drops trailing zeros
  // (`840.0` -> `"840"`) because V8 Number.toString() normalizes the
  // decimal representation. Excel and every major CSV consumer handle
  // this correctly, so we keep the cheap path rather than forcing
  // `.toFixed(n)` per column.
  function buildCsv(header, rows) {
    var lines = [csvLine(header)];
    rows.forEach(function (r) { lines.push(csvLine(r)); });
    return lines.join("\r\n") + "\r\n";
  }
  function sanitizeLabelForFilename(s) {
    if (!s) return "";
    var cleaned = String(s).replaceAll(/[^A-Za-z0-9]+/g, "-");
    cleaned = cleaned.replaceAll(/-+/g, "-").replaceAll(/^-|-$/g, "");
    return cleaned;
  }
  function pad2(n) { return n < 10 ? "0" + n : String(n); }
  function timestampForFilename() {
    var d = new Date();
    return d.getFullYear() +
      pad2(d.getMonth() + 1) +
      pad2(d.getDate()) + "-" +
      pad2(d.getHours()) +
      pad2(d.getMinutes()) +
      pad2(d.getSeconds());
  }
  function buildCsvFilename(tabName) {
    var label = sanitizeLabelForFilename(payload.input_label || "");
    var prefix = label ? "perf-sentinel-" + label : "perf-sentinel";
    return prefix + "-" + tabName + "-" + timestampForFilename() + ".csv";
  }
  function downloadCsv(tabName, csvText) {
    var blob = new Blob([csvText], { type: "text/csv;charset=utf-8" });
    var url = URL.createObjectURL(blob);
    var a = document.createElement("a");
    a.href = url;
    a.download = buildCsvFilename(tabName);
    document.body.appendChild(a);
    a.click();
    a.remove();
    // Delay the revoke so the browser has the URL in hand when it
    // kicks off the download. Immediate revoke breaks the download on
    // some browsers. 0ms is enough to escape the current task.
    setTimeout(function () { URL.revokeObjectURL(url); }, 0);
  }

  function searchTermFor(tabKey) {
    var cfg = SEARCHABLE_TABS && SEARCHABLE_TABS[tabKey];
    if (!cfg) return "";
    var input = document.getElementById(cfg.inputId);
    if (!input) return "";
    return (input.value || "").toLowerCase();
  }
  function matchesSearch(haystack, term) {
    if (!term) return true;
    return String(haystack || "").toLowerCase().includes(term);
  }

  function exportFindingsCsv() {
    var term = searchTermFor("findings");
    var header = [
      "severity", "type", "service", "endpoint", "template",
      "occurrences", "first_timestamp", "last_timestamp",
      "code_function", "code_filepath", "code_lineno",
      "suggested_fix_framework", "suggested_fix_recommendation"
    ];
    var rows = applyFilters().filter(function (f) {
      var blob = [
        f.severity, f.type || f.finding_type, f.service, f.source_endpoint,
        f.pattern && f.pattern.template
      ].join(" ");
      return matchesSearch(blob, term);
    }).map(function (f) {
      var p = f.pattern || {};
      var loc = f.code_location || {};
      var fix = f.suggested_fix || {};
      return [
        f.severity || "",
        f.type || f.finding_type || "",
        f.service || "",
        f.source_endpoint || "",
        p.template || "",
        p.occurrences ?? "",
        f.first_timestamp || "",
        f.last_timestamp || "",
        loc.function || "",
        loc.filepath || "",
        loc.lineno ?? "",
        fix.framework || "",
        fix.recommendation || ""
      ];
    });
    downloadCsv("findings", buildCsv(header, rows));
  }

  function exportPgStatCsv() {
    var term = searchTermFor("pgstat");
    var header = [
      "template", "calls", "total_exec_time_ms", "mean_exec_time_ms",
      "rows", "shared_blks_hit", "shared_blks_read", "seen_in_traces"
    ];
    var rows = activePgStatEntries().filter(function (e) {
      return matchesSearch(e.normalized_template, term);
    }).map(function (e) {
      return [
        e.normalized_template || "",
        e.calls ?? "",
        e.total_exec_time_ms ?? "",
        e.mean_exec_time_ms ?? "",
        e.rows ?? "",
        e.shared_blks_hit ?? "",
        e.shared_blks_read ?? "",
        e.seen_in_traces ? "true" : "false"
      ];
    });
    downloadCsv("pgstat", buildCsv(header, rows));
  }

  function diffFindingMatchBlob(f) {
    return [
      f.severity, f.type || f.finding_type, f.service, f.source_endpoint,
      f.pattern && f.pattern.template
    ].join(" ");
  }
  function exportDiffCsv() {
    if (!hasDiff) return;
    var term = searchTermFor("diff");
    var header = [
      "section", "severity", "type", "service", "endpoint", "template",
      "occurrences", "before_severity", "after_severity",
      "before_io_ops", "after_io_ops", "delta"
    ];
    var rows = [];
    (diffData.new_findings || []).forEach(function (f) {
      if (!matchesSearch(diffFindingMatchBlob(f), term)) return;
      var p = f.pattern || {};
      rows.push([
        "new", f.severity || "", f.type || f.finding_type || "",
        f.service || "", f.source_endpoint || "", p.template || "",
        p.occurrences ?? "",
        "", "", "", "", ""
      ]);
    });
    (diffData.resolved_findings || []).forEach(function (f) {
      if (!matchesSearch(diffFindingMatchBlob(f), term)) return;
      var p = f.pattern || {};
      rows.push([
        "resolved", f.severity || "", f.type || f.finding_type || "",
        f.service || "", f.source_endpoint || "", p.template || "",
        p.occurrences ?? "",
        "", "", "", "", ""
      ]);
    });
    (diffData.severity_changes || []).forEach(function (c) {
      var f = c.finding || {};
      if (!matchesSearch(diffFindingMatchBlob(f), term)) return;
      var p = f.pattern || {};
      rows.push([
        "severity_change", "", f.type || f.finding_type || "",
        f.service || "", f.source_endpoint || "", p.template || "",
        p.occurrences ?? "",
        c.before_severity || "", c.after_severity || "",
        "", "", ""
      ]);
    });
    (diffData.endpoint_metric_deltas || []).forEach(function (d) {
      var blob = [d.service, d.endpoint].join(" ");
      if (!matchesSearch(blob, term)) return;
      rows.push([
        "endpoint_delta", "", "",
        d.service || "", d.endpoint || "", "",
        "", "", "",
        d.before_io_ops ?? "",
        d.after_io_ops ?? "",
        d.delta ?? ""
      ]);
    });
    downloadCsv("diff", buildCsv(header, rows));
  }

  function exportCorrelationsCsv() {
    var term = searchTermFor("correlations");
    var header = [
      "service_a", "type_a", "template_a",
      "service_b", "type_b", "template_b",
      "confidence", "co_occurrence_count",
      "source_total_occurrences", "median_lag_ms",
      "first_seen", "last_seen"
    ];
    var rows = correlations.filter(function (c) {
      var src = c.source || {};
      var tgt = c.target || {};
      var blob = [
        src.service, src.finding_type, tgt.service, tgt.finding_type
      ].join(" ");
      return matchesSearch(blob, term);
    }).map(function (c) {
      var s = c.source || {};
      var t = c.target || {};
      return [
        s.service || "", s.finding_type || "", s.template || "",
        t.service || "", t.finding_type || "", t.template || "",
        c.confidence ?? "",
        c.co_occurrence_count ?? "",
        c.source_total_occurrences ?? "",
        c.median_lag_ms ?? "",
        c.first_seen || "", c.last_seen || ""
      ];
    });
    downloadCsv("correlations", buildCsv(header, rows));
  }

  // -------- deep-link hash --------
  // Shape: `#<tab>[&k=v[&k=v...]]`. Medium-scope: tab, search term,
  // pg_stat ranking slug, findings severity chip, findings service chip.
  // Writes replace history entries (no back/forward pollution).
  var RANKING_SLUGS = ["total_time", "calls", "mean_time", "io_blocks"];
  function rankingSlugForIndex(idx) {
    return RANKING_SLUGS[idx] || String(idx);
  }
  function rankingIndexForSlug(slug) {
    if (RANKING_SLUGS.includes(slug)) return RANKING_SLUGS.indexOf(slug);
    var n = Number.parseInt(slug, 10);
    return Number.isFinite(n) ? n : -1;
  }

  // Keys accepted from the URL fragment. Anything outside this set is
  // ignored so a malformed or malicious hash cannot override the tab
  // via a later `tab=` pair, inject arbitrary properties onto `state`,
  // or confuse `applyHash`. The tab itself is positional (first
  // token), not a key=value pair. Stored as a Set so existence checks
  // are O(1) regardless of how many keys land here in the future.
  var HASH_KEYS = new Set(["search", "ranking", "severity", "service"]);
  function readHash() {
    var raw = (location.hash || "").replace(/^#/, "");
    if (!raw) return null;
    var parts = raw.split("&");
    var state = { tab: parts.shift() || null };
    parts.forEach(function (p) {
      if (!p) return;
      var eq = p.indexOf("=");
      if (eq < 0) return;
      var k = p.slice(0, eq);
      if (!HASH_KEYS.has(k)) return;
      var v = p.slice(eq + 1);
      try {
        v = decodeURIComponent(v);
      } catch {
        // Malformed percent-encoding in a shared URL, keep the raw
        // value so downstream string compares still work.
        return;
      }
      state[k] = v;
    });
    return state;
  }

  function currentStateForHash() {
    var state = { tab: currentTab };
    if (currentTab && SEARCHABLE_TABS[currentTab]) {
      var term = searchTermFor(currentTab);
      if (term) state.search = term;
    }
    if (currentTab === "findings") {
      if (filterState.severity) state.severity = filterState.severity;
      if (filterState.service) state.service = filterState.service;
    }
    if (currentTab === "pgstat") {
      state.ranking = rankingSlugForIndex(activeRankingIndex);
    }
    return state;
  }

  function encodeHashFromState(state) {
    if (!state || !state.tab) return "";
    var parts = [state.tab];
    ["search", "ranking", "severity", "service"].forEach(function (k) {
      var v = state[k];
      if (v !== null && v !== undefined && v !== "") {
        parts.push(k + "=" + encodeURIComponent(String(v)));
      }
    });
    return parts.join("&");
  }

  // Guards against applyHash / writeHash ping-pong. The hashchange
  // listener compares this against location.hash to tell user-driven
  // changes from our own writeHash calls.
  var _lastWrittenHash = null;

  function writeHash(state) {
    var hashStr = encodeHashFromState(state);
    var full = hashStr ? "#" + hashStr : "";
    try {
      history.replaceState(null, "", full || location.pathname + location.search);
      _lastWrittenHash = hashStr;
    } catch {
      // Old browsers without history.replaceState: fall back to a
      // direct hash assignment. Pushes one history entry per change,
      // the lesser of two evils.
      location.hash = hashStr;
      _lastWrittenHash = hashStr;
    }
  }

  // Debounce writeHash to smooth keystrokes in search inputs and bursty
  // chip clicks; 200ms is barely perceptible and keeps history quiet.
  var hashWriteTimer = null;
  function scheduleHashWrite() {
    if (hashWriteTimer) clearTimeout(hashWriteTimer);
    hashWriteTimer = setTimeout(function () {
      hashWriteTimer = null;
      writeHash(currentStateForHash());
    }, 200);
  }

  function applyHash(state) {
    if (!state || !state.tab) return false;
    if (!tabIsRegistered(state.tab)) return false;
    // Apply filter state before switching so the target tab already
    // shows the correct view. Severity / service chips modify
    // filterState and re-render the findings list.
    if (state.tab === "findings") {
      filterState.severity = null;
      filterState.service = null;
      if (state.severity === "critical" || state.severity === "warning") {
        filterState.severity = state.severity;
      }
      if (state.service) filterState.service = state.service;
      syncFilterChips();
      resetShownCount();
      renderFindingsList();
    }
    if (state.tab === "pgstat") {
      var idx = rankingIndexForSlug(state.ranking || "");
      if (idx >= 0 && idx < pgStatRankings.length) {
        // Single source of truth: selectPgStatRanking handles both the
        // sessionStorage write and the early-return when idx already
        // matches activeRankingIndex.
        selectPgStatRanking(idx);
      }
    }
    switchTab(state.tab);
    // Restore the search input for the target tab after tab switch,
    // which runs `clearAllSearchFilters`. Reapply the filter so rows
    // match the decoded search term.
    if (state.search && SEARCHABLE_TABS[state.tab]) {
      var cfg = SEARCHABLE_TABS[state.tab];
      var input = document.getElementById(cfg.inputId);
      if (input) {
        input.style.display = "block";
        input.value = state.search;
        applySearchFilter(cfg);
      }
    }
    return true;
  }

  // -------- cheatsheet modal --------
  var CHEATSHEET_ROWS = [
    ["j", "Move finding selection down"],
    ["k", "Move finding selection up"],
    ["Enter", "Open selected finding in Explain"],
    ["Esc", "Close help, close search, clear filters, back from Explain"],
    ["/", "Open filter search for active tab"],
    ["g f", "Go to Findings"],
    ["g e", "Go to Explain (if available)"],
    ["g p", "Go to pg_stat (if available)"],
    ["g d", "Go to Diff (if available)"],
    ["g c", "Go to Correlations (if available)"],
    ["g r", "Go to GreenOps (if available)"],
    ["?", "Show this cheatsheet"]
  ];
  function populateCheatsheet() {
    var body = document.getElementById("cheatsheet-body");
    if (!body) return;
    body.textContent = "";
    CHEATSHEET_ROWS.forEach(function (row) {
      var tr = document.createElement("tr");
      var tdK = document.createElement("td");
      var kbd = el("span", "ps-kbd", row[0]);
      tdK.appendChild(kbd);
      tr.appendChild(tdK);
      tr.appendChild(el("td", null, row[1]));
      body.appendChild(tr);
    });
  }
  // Native <dialog> element: the browser manages the backdrop, the
  // focus trap, and the Esc-to-close behavior. We only layer focus
  // restoration and backdrop-click-to-close on top.
  function isCheatsheetOpen() {
    var dlg = document.getElementById("cheatsheet");
    return !!(dlg && dlg.open);
  }
  // Stash the element that owned focus when the cheatsheet opened so
  // closing restores the j/k cursor position in the Findings list (or
  // wherever the user came from). Cleared on close.
  var cheatsheetPriorFocus = null;
  function openCheatsheet() {
    var dlg = document.getElementById("cheatsheet");
    if (!dlg || dlg.open) return;
    cheatsheetPriorFocus = document.activeElement;
    dlg.showModal();
    var closeBtn = document.getElementById("cheatsheet-close");
    if (closeBtn) closeBtn.focus();
  }
  function closeCheatsheet() {
    var dlg = document.getElementById("cheatsheet");
    if (dlg && dlg.open) dlg.close();
  }
  function toggleCheatsheet() {
    if (isCheatsheetOpen()) closeCheatsheet();
    else openCheatsheet();
  }

  function anyFilterChipActive() {
    return !!(filterState.severity || filterState.service);
  }
  function clearFilterChips() {
    filterState.severity = null;
    filterState.service = null;
    syncFilterChips();
    resetShownCount();
    renderFindingsList();
  }

  // -------- keyboard --------
  function isSearchInputFocused() {
    var active = document.activeElement;
    return !!(active && active.tagName === "INPUT" && active.classList.contains("ps-search"));
  }
  function isTextInputFocused() {
    var a = document.activeElement;
    if (!a) return false;
    var tag = a.tagName;
    if (tag === "INPUT" || tag === "TEXTAREA") return true;
    return a.isContentEditable === true;
  }
  /// Escape ladder: close cheatsheet, close search, leave Explain,
  /// clear filter chips. Each tier returns as soon as it acts.
  function handleEscape(ev) {
    if (isCheatsheetOpen()) {
      closeCheatsheet();
      ev.preventDefault();
      return;
    }
    if (isSearchInputFocused()) {
      closeSearch(document.activeElement);
      ev.preventDefault();
      return;
    }
    if (currentTab === "explain") {
      switchTab("findings");
      return;
    }
    if (currentTab === "findings" && anyFilterChipActive()) {
      clearFilterChips();
      scheduleHashWrite();
      ev.preventDefault();
    }
  }
  /// Slash handling: open the active tab's search input.
  function handleSlash(ev) {
    if (isSearchInputFocused() || !SEARCHABLE_TABS[currentTab]) return;
    openSearchForActiveTab();
    ev.preventDefault();
  }
  /// j / k / enter navigation on the Findings list.
  function handleFindingsNav(ev) {
    if (visibleFindings.length === 0) return;
    if (ev.key === "j") {
      selectedIndex = (selectedIndex + 1) % visibleFindings.length;
      syncSelection();
      scrollSelectedIntoView();
    } else if (ev.key === "k") {
      selectedIndex = (selectedIndex - 1 + visibleFindings.length) % visibleFindings.length;
      syncSelection();
      scrollSelectedIntoView();
    } else if (ev.key === "Enter" && selectedIndex >= 0) {
      openExplain(visibleFindings[selectedIndex]);
    }
    ev.preventDefault();
  }
  // g-prefixed tab shortcuts. `g` alone arms a 1000ms window; the next
  // key consumes it regardless of whether it matches a tab. Hidden tabs
  // are a silent no-op (no feedback, no flash).
  var pendingGTimer = null;
  var G_MAPPING = {
    f: "findings", e: "explain", p: "pgstat",
    d: "diff", c: "correlations", r: "green"
  };
  function clearPendingG() {
    if (pendingGTimer) {
      clearTimeout(pendingGTimer);
      pendingGTimer = null;
    }
  }
  function handleGPrefix(ev) {
    // Ignore OS-level key autorepeat: holding `g` must not rearm the
    // prefix, and holding the second letter must not fire the tab
    // switch twice. The dispatcher continues past this handler so
    // autorepeat on j/k/Enter still drives Findings navigation.
    if (ev.repeat) return false;
    if (ev.key === "g" && pendingGTimer === null) {
      pendingGTimer = setTimeout(function () { pendingGTimer = null; }, 1000);
      return true;
    }
    if (pendingGTimer !== null) {
      clearPendingG();
      var target = G_MAPPING[ev.key];
      if (target && tabIsRegistered(target)) {
        switchTab(target);
        ev.preventDefault();
      }
      return true;
    }
    return false;
  }
  document.addEventListener("keydown", function (ev) {
    if (ev.key === "Escape") { handleEscape(ev); return; }
    // `?` opens the cheatsheet unless a text input is consuming it.
    if (ev.key === "?" && !isTextInputFocused()) {
      toggleCheatsheet();
      ev.preventDefault();
      return;
    }
    if (isCheatsheetOpen()) return;
    if (ev.key === "/") { handleSlash(ev); return; }
    if (isSearchInputFocused()) return;
    if (isTextInputFocused()) return;
    if (handleGPrefix(ev)) return;
    if (currentTab !== "findings") return;
    if (ev.key === "j" || ev.key === "k" || ev.key === "Enter") {
      handleFindingsNav(ev);
    }
  });
  function scrollSelectedIntoView() {
    var rows = document.querySelectorAll("#findings-list .ps-row");
    if (selectedIndex >= 0 && selectedIndex < rows.length) {
      rows[selectedIndex].scrollIntoView({ block: "nearest" });
    }
  }

  document.getElementById("pgstat-drill-clear").addEventListener("click", clearPgStatDrill);

  // -------- boot helpers --------
  // Each helper owns one slice of boot work so the IIFE body stays
  // linear and cognitive complexity stays bounded. Sonar flags the
  // IIFE itself when too many branches accumulate at this level.

  function registerAllTabs() {
    registerTab("findings", "Findings", function () { return findings.length; });
    registerTab("explain", "Explain", null);
    if (hasPgStat) {
      registerTab("pgstat", "pg_stat", function () {
        // Badge shows the currently-active ranking's entry count. Every
        // ranking contains the same top-N entries, just reordered, so
        // the number is identical across rankings (see rank_pg_stat).
        return activePgStatEntries().length;
      });
    }
    if (hasDiff) {
      registerTab("diff", "Diff", function () {
        return (
          (diffData.new_findings || []).length + (diffData.resolved_findings || []).length
        );
      });
    }
    if (hasCorrelations) {
      registerTab("correlations", "Correlations", function () {
        return correlations.length;
      });
    }
    if (hasGreen) registerTab("green", "GreenOps", null);
    renderTabs();
  }

  function restorePersistedPgStatRanking() {
    // Restore the persisted ranking before the first render so the
    // initial table already reflects the user's last choice. A hash
    // with a ranking slug overrides this, inside `applyHash`.
    if (!hasPgStat) return;
    var storedRanking = sessionGet(STORAGE_KEYS.pgstatRanking);
    if (!storedRanking) return;
    var storedIdx = rankingIndexForSlug(storedRanking);
    if (storedIdx >= 0 && storedIdx < pgStatRankings.length) {
      activeRankingIndex = storedIdx;
    }
  }

  function renderAllPanels() {
    renderTrimBanner();
    renderFindingsMetrics();
    renderFilterChips();
    restorePersistedPgStatRanking();
    renderFindingsList();
    if (hasPgStat) renderPgStatPanel();
    if (hasDiff) renderDiffPanel();
    if (hasCorrelations) renderCorrelationsPanel();
    if (hasGreen) renderGreenPanel();
  }

  function wireCheatsheetDialog() {
    var closeBtn = document.getElementById("cheatsheet-close");
    if (closeBtn) closeBtn.addEventListener("click", closeCheatsheet);
    var dlg = document.getElementById("cheatsheet");
    if (!dlg) return;
    // Native <dialog> manages Esc-to-close and the focus trap for us.
    // We only restore focus to wherever it was before the dialog
    // opened, on the close event (covers both our manual close and
    // the native Esc path).
    dlg.addEventListener("close", restorePriorFocus);
    // Click outside the dialog's content area closes it. With
    // showModal(), clicks on the backdrop hit the dialog itself,
    // clicks on any descendant hit that descendant.
    dlg.addEventListener("click", function (ev) {
      if (ev.target === dlg) closeCheatsheet();
    });
  }

  function restorePriorFocus() {
    var prior = cheatsheetPriorFocus;
    cheatsheetPriorFocus = null;
    if (!prior || typeof prior.focus !== "function") return;
    try {
      prior.focus();
    } catch {
      // Prior element was removed while the dialog was open (most
      // likely a re-render). Silent fallback: the browser picks a
      // sensible default.
      return;
    }
  }

  function wireShowMoreButton() {
    var btn = document.getElementById("findings-show-more");
    if (!btn) return;
    btn.addEventListener("click", function () {
      shownCount += LIST_CAP;
      renderFindingsList();
    });
  }

  function wireExportButtons() {
    var exportHandlers = {
      findings: exportFindingsCsv,
      pgstat: exportPgStatCsv,
      diff: exportDiffCsv,
      correlations: exportCorrelationsCsv
    };
    Object.keys(exportHandlers).forEach(function (tabKey) {
      var btn = document.getElementById(tabKey + "-export");
      if (btn) btn.addEventListener("click", exportHandlers[tabKey]);
    });
  }

  // -------- copy-link buttons --------
  function copyCurrentLink(btn) {
    // Capture the label once so repeat clicks inside the flash window
    // do not end up restoring "Copied" as the baseline.
    if (!btn.dataset.baseLabel) btn.dataset.baseLabel = btn.textContent;
    var baseLabel = btn.dataset.baseLabel;
    var href = location.href;

    function flashCopied() {
      btn.textContent = "Copied";
      if (btn._copyFlashTimer) clearTimeout(btn._copyFlashTimer);
      btn._copyFlashTimer = setTimeout(function () {
        btn._copyFlashTimer = null;
        btn.textContent = baseLabel;
      }, 1500);
    }

    // file:// origins and older browsers reject navigator.clipboard,
    // so fall back to a throwaway textarea + execCommand.
    function fallbackCopy() {
      try {
        var ta = document.createElement("textarea");
        ta.value = href;
        ta.setAttribute("readonly", "");
        ta.style.position = "absolute";
        ta.style.left = "-9999px";
        document.body.appendChild(ta);
        ta.select();
        var ok = document.execCommand("copy");
        ta.remove();
        if (ok) {
          flashCopied();
        } else {
          console.error("copyCurrentLink: execCommand('copy') returned false");
        }
      } catch (err) {
        console.error("copyCurrentLink fallback failed", err);
      }
    }

    if (navigator.clipboard && typeof navigator.clipboard.writeText === "function") {
      navigator.clipboard.writeText(href).then(flashCopied, function (err) {
        console.error("navigator.clipboard.writeText rejected", err);
        fallbackCopy();
      });
    } else {
      fallbackCopy();
    }
  }

  function wireCopyLinkButtons() {
    ["findings", "pgstat", "diff", "correlations"].forEach(function (tabKey) {
      var btn = document.getElementById(tabKey + "-copy-link");
      if (!btn) return;
      btn.addEventListener("click", function () {
        copyCurrentLink(btn);
      });
    });
  }

  function applyInitialHashOrWrite() {
    // Apply the deep-link hash last so it can override the initial
    // ranking / filter chips / tab selection derived above. Falls
    // through silently when the hash is missing, malformed, or points
    // to a tab that is not registered in this report.
    var initialHash = readHash();
    if (applyHash(initialHash)) return;
    // No hash: emit the current state so sharing the URL immediately
    // after load produces a self-describing link.
    writeHash(currentStateForHash());
  }

  function wireHashChangeListener() {
    // Skip events triggered by our own writeHash replaceState, apply
    // only real user-driven changes.
    globalThis.addEventListener("hashchange", function () {
      var raw = (location.hash || "").replace(/^#/, "");
      if (raw === _lastWrittenHash) return;
      applyHash(readHash());
    });
  }

  // -------- boot --------
  renderTopbar();
  registerAllTabs();
  renderAllPanels();
  initSearchInputs();
  populateCheatsheet();
  wireCheatsheetDialog();
  wireShowMoreButton();
  wireExportButtons();
  wireCopyLinkButtons();
  applyInitialHashOrWrite();
  wireHashChangeListener();
})();
</script>
</body>
</html>