// SPEC: PJ2026-01040111 long-running Workbench observation.
// Responsibility: Analyzer Workbench terminal projection and three-state triad source fragment.

export function nodeWebObserveAnalyzerWorkbenchTriadSource(): string {
  return String.raw`function detectWorkbenchInPlaceProjectionLag(samples, network, control = []) {
  const canarySessionIds = sessionInvariantCanarySessionIds(control);
  const terminalTraceMissing = detectWorkbenchTerminalTraceMissing(samples, canarySessionIds);
  const terminalApiDomLag = detectWorkbenchTerminalApiDomLag(samples, network, canarySessionIds);
  return {
    terminalTraceMissing,
    terminalApiDomLag,
    valuesRedacted: true
  };
}

function detectWorkbenchTerminalTraceMissing(samples, canarySessionIds = new Set()) {
  const budgetMs = Number.isFinite(Number(alertThresholds.sameOriginApiSlowMs)) ? Number(alertThresholds.sameOriginApiSlowMs) : 10_000;
  const rows = [];
  const open = new Map();
  const sortedSamples = (Array.isArray(samples) ? samples : [])
    .filter(isWorkbenchPathSample)
    .filter((sample) => workbenchSampleMatchesCanarySessions(sample, canarySessionIds))
    .slice()
    .sort((a, b) => Date.parse(a?.ts || "") - Date.parse(b?.ts || ""));
  const closeSegment = (key, lastSample = null) => {
    const segment = open.get(key);
    if (!segment) return;
    open.delete(key);
    const firstMs = Date.parse(segment.first.ts || "");
    const lastMs = Date.parse((lastSample ?? segment.last).ts || "");
    const observedMs = Number.isFinite(firstMs) && Number.isFinite(lastMs) && lastMs >= firstMs ? Math.round(lastMs - firstMs) : 0;
    if (observedMs <= budgetMs) return;
    rows.push({
      ...ref(segment.first),
      lastSeq: segment.last.seq ?? null,
      lastAt: segment.last.ts ?? null,
      traceId: segment.traceId,
      messageCount: Array.isArray(segment.last.messages) ? segment.last.messages.length : 0,
      turnCount: Array.isArray(segment.last.turns) ? segment.last.turns.length : 0,
      traceRowCount: 0,
      sampleCount: segment.sampleCount,
      observedMs,
      budgetMs,
      finalMessageVisible: workbenchFinalMessageVisible(segment.last, segment.traceId),
      terminalTurnVisible: workbenchTerminalTurnVisible(segment.last, segment.traceId),
      detail: "terminal turn/message stayed visible for this trace while the same in-place Workbench page had zero trace rows beyond the configured budget",
      valuesRedacted: true
    });
  };
  for (const sample of sortedSamples) {
    if (!isWorkbenchPathSample(sample)) continue;
    const tsMs = Date.parse(sample?.ts || "");
    if (!Number.isFinite(tsMs)) continue;
    const terminalTraceIds = workbenchTerminalTraceIdsFromDom(sample);
    const presentKeys = new Set();
    for (const traceId of terminalTraceIds) {
      const key = [samplePageKey(sample), sample?.routeSessionId ?? "", sample?.activeSessionId ?? "", traceId].join("|");
      presentKeys.add(key);
      const traceRows = workbenchTraceRowsForTrace(sample, traceId);
      if (traceRows.length > 0 || workbenchSampleHasTerminalProjection(sample, { traceIds: [traceId] })) {
        closeSegment(key, sample);
        continue;
      }
      const existing = open.get(key);
      if (existing) {
        existing.last = sample;
        existing.sampleCount += 1;
      } else {
        open.set(key, { first: sample, last: sample, traceId, sampleCount: 1 });
      }
    }
    for (const [key, segment] of Array.from(open.entries())) {
      if (samplePageKey(sample) === samplePageKey(segment.first) && !presentKeys.has(key)) closeSegment(key, sample);
    }
  }
  for (const key of Array.from(open.keys())) closeSegment(key);
  return rows;
}

function detectWorkbenchTerminalApiDomLag(samples, network, canarySessionIds = new Set()) {
  const windowMs = 30_000;
  const budgetMs = Number.isFinite(Number(alertThresholds.sameOriginApiSlowMs)) ? Number(alertThresholds.sameOriginApiSlowMs) : 10_000;
  const sampleRows = (Array.isArray(samples) ? samples : [])
    .filter(isWorkbenchPathSample)
    .filter((sample) => workbenchSampleMatchesCanarySessions(sample, canarySessionIds))
    .map((sample) => ({ sample, tsMs: Date.parse(sample?.ts || ""), pageKey: samplePageKey(sample) }))
    .filter((item) => Number.isFinite(item.tsMs))
    .sort((a, b) => a.tsMs - b.tsMs);
  const rowsByPage = new Map();
  for (const row of sampleRows) {
    const rows = rowsByPage.get(row.pageKey) || [];
    rows.push(row);
    rowsByPage.set(row.pageKey, rows);
  }
  const terminalEvents = (Array.isArray(network) ? network : [])
    .map(compactWorkbenchTerminalApiEvent)
    .filter((item) => workbenchTerminalEventMatchesCanarySessions(item, canarySessionIds))
    .filter((item) => item !== null);
  const overBudget = [];
  for (const event of terminalEvents) {
    const pageSamples = rowsByPage.get(event.pageKey) || [];
    if (pageSamples.length === 0 || event.tsMs < pageSamples[0].tsMs) continue;
    const alreadyVisible = lastWorkbenchSampleAtOrBefore(pageSamples, event.tsMs, event, (row) => workbenchSampleHasTerminalProjection(row.sample, event));
    if (alreadyVisible) continue;
    const firstAfter = firstWorkbenchSampleAfter(pageSamples, event.tsMs, event.tsMs + windowMs, event);
    const firstMiss = firstWorkbenchSampleAfter(pageSamples, event.tsMs, event.tsMs + budgetMs, event, (row) => !workbenchSampleHasTerminalProjection(row.sample, event));
    const resolved = firstWorkbenchSampleAfter(pageSamples, event.tsMs, event.tsMs + windowMs, event, (row) => workbenchSampleHasTerminalProjection(row.sample, event));
    const deltaMs = resolved ? Math.max(0, Math.round(resolved.tsMs - event.tsMs)) : null;
    const unresolved = !resolved;
    const exceedsBudget = unresolved || (Number.isFinite(deltaMs) && deltaMs > budgetMs);
    if (!firstMiss) continue;
    if (!exceedsBudget) continue;
    overBudget.push({
      ts: event.ts,
      pageRole: event.pageRole,
      pageId: event.pageId,
      routeKind: event.routeKind,
      method: event.method,
      path: event.path,
      traceIds: event.traceIds.slice(0, 6),
      sessionIds: event.sessionIds.slice(0, 4),
      terminalEvidenceCount: event.terminalEvidenceCount,
      traceEventLikeCount: event.traceEventLikeCount,
      finalTextFieldCount: event.finalTextFieldCount,
      budgetMs,
      windowMs,
      resolvedDeltaMs: deltaMs,
      unresolvedWithinWindow: unresolved,
      firstAfterSample: compactWorkbenchProjectionSample(firstAfter?.sample, event),
      firstMissSample: compactWorkbenchProjectionSample(firstMiss?.sample, event),
      resolvedSample: compactWorkbenchProjectionSample(resolved?.sample, event),
      valuesRedacted: true
    });
  }
  return {
    summary: {
      terminalEventCount: terminalEvents.length,
      overBudgetCount: overBudget.length,
      budgetMs,
      windowMs,
      valuesRedacted: true
    },
    overBudget,
    terminalEvents: terminalEvents.slice(-20),
    valuesRedacted: true
  };
}

function workbenchSampleMatchesCanarySessions(sample, canarySessionIds) {
  if (!(canarySessionIds instanceof Set) || canarySessionIds.size === 0) return true;
  const sessionIds = [sample?.routeSessionId, sample?.activeSessionId].filter(Boolean).map(String);
  return sessionIds.some((id) => canarySessionIds.has(id));
}

function workbenchTerminalEventMatchesCanarySessions(event, canarySessionIds) {
  if (!event) return false;
  if (!(canarySessionIds instanceof Set) || canarySessionIds.size === 0) return true;
  const eventSessionIds = Array.isArray(event.sessionIds) ? event.sessionIds.map(String) : [];
  return eventSessionIds.some((id) => canarySessionIds.has(id));
}

function compactWorkbenchTerminalApiEvent(item) {
  if (!item || item.type !== "response" || item.observerInitiated === true) return null;
  const summary = objectValue(item.bodySummary);
  if (!summary || Number(summary.terminalEvidenceCount ?? 0) <= 0) return null;
  const parsed = parseApiDomLagUrl(item.url);
  if (!String(parsed.path || "").startsWith("/v1/workbench/") && parsed.path !== "/v1/agent/chat" && parsed.path !== "/v1/agent/chat/steer") return null;
  const routeKind = summary.pathKind ?? apiDomLagRouteKind(parsed.path);
  if (!isReliableWorkbenchTerminalApiEvent(summary, routeKind)) return null;
  const terminalTraceIds = uniqueSorted(Array.isArray(summary.terminalTraceIds) ? summary.terminalTraceIds : []).slice(0, 12);
  if (terminalTraceIds.length === 0) return null;
  const tsMs = Date.parse(item.ts || "");
  if (!Number.isFinite(tsMs)) return null;
  return {
    ts: item.ts,
    tsMs,
    pageRole: item.pageRole ?? null,
    pageId: item.pageId ?? null,
    pageKey: String(item.pageRole || "control") + ":" + String(item.pageId || "default"),
    method: String(item.method || "GET").toUpperCase(),
    path: parsed.path,
    routeKind,
    traceIds: terminalTraceIds,
    observedTraceIds: uniqueSorted([...(Array.isArray(summary.traceIds) ? summary.traceIds : []), parsed.traceId].filter(Boolean)).slice(0, 12),
    sessionIds: uniqueSorted([...(Array.isArray(summary.sessionIds) ? summary.sessionIds : []), parsed.sessionId].filter(Boolean)).slice(0, 12),
    terminalEvidenceCount: Number(summary.terminalEvidenceCount ?? 0),
    terminalStatusCount: Number(summary.terminalStatusCount ?? 0),
    terminalTextCount: Number(summary.terminalTextCount ?? 0),
    traceEventLikeCount: Number(summary.traceEventLikeCount ?? 0),
    finalTextFieldCount: Number(summary.finalTextFieldCount ?? 0),
    valuesRedacted: true
  };
}

function isReliableWorkbenchTerminalApiEvent(summary, routeKind) {
  if (!summary || routeKind !== "workbench-turn") return false;
  if (Number(summary.terminalEvidenceCount ?? 0) <= 0) return false;
  return Number(summary.runningStatusCount ?? 0) <= 0;
}

function lastWorkbenchSampleAtOrBefore(rows, tsMs, event, predicate = null) {
  let result = null;
  for (const row of rows || []) {
    if (row.tsMs > tsMs) break;
    if (!workbenchSampleMatchesTerminalEvent(row.sample, event)) continue;
    if (typeof predicate === "function" && !predicate(row)) continue;
    result = row;
  }
  return result;
}

function firstWorkbenchSampleAfter(rows, startMs, endMs, event, predicate = null) {
  for (const row of rows || []) {
    if (row.tsMs < startMs) continue;
    if (row.tsMs > endMs) break;
    if (!workbenchSampleMatchesTerminalEvent(row.sample, event)) continue;
    if (typeof predicate === "function" && !predicate(row)) continue;
    return row;
  }
  return null;
}

function workbenchSampleMatchesTerminalEvent(sample, event) {
  if (!sample || !event) return false;
  if (event.sessionIds.length > 0) {
    const sessionIds = new Set([sample.routeSessionId, sample.activeSessionId].filter(Boolean).map(String));
    if (!event.sessionIds.some((id) => sessionIds.has(id))) return false;
  }
  if (event.traceIds.length > 0) {
    const traces = sampleTraceIds(sample);
    if (traces.size === 0) return false;
    if (!event.traceIds.some((id) => traces.has(id))) return false;
  }
  return true;
}

function workbenchSampleHasTerminalProjection(sample, event) {
  const traceIds = event.traceIds.length > 0 ? event.traceIds : Array.from(sampleTraceIds(sample));
  if (traceIds.length === 0) return false;
  return traceIds.some((traceId) => workbenchFinalMessageVisible(sample, traceId) || workbenchTerminalTurnVisible(sample, traceId));
}

function compactWorkbenchProjectionSample(sample, event = null) {
  if (!sample) return null;
  const eventTraceIds = event?.traceIds && event.traceIds.length > 0 ? event.traceIds : Array.from(sampleTraceIds(sample));
  const visibleTraceIds = eventTraceIds.slice(0, 6);
  return {
    ...ref(sample),
    messageCount: Array.isArray(sample.messages) ? sample.messages.length : 0,
    turnCount: Array.isArray(sample.turns) ? sample.turns.length : 0,
    traceRowCount: Array.isArray(sample.traceRows) ? sample.traceRows.length : 0,
    traceIds: visibleTraceIds,
    finalMessageVisible: visibleTraceIds.some((traceId) => workbenchFinalMessageVisible(sample, traceId)),
    terminalTurnVisible: visibleTraceIds.some((traceId) => workbenchTerminalTurnVisible(sample, traceId)),
    valuesRedacted: true
  };
}

function isWorkbenchPathSample(sample) {
  return /\/workbench(?:\/|$)/u.test(String(sample?.path || sample?.url || ""));
}

function workbenchTerminalTraceIdsFromDom(sample) {
  const ids = new Set();
  for (const groupName of ["turns", "messages"]) {
    const group = Array.isArray(sample?.[groupName]) ? sample[groupName] : [];
    for (const item of group) {
      const traceId = stringOrNull(item?.traceId);
      if (!traceId) continue;
      if (workbenchDomItemIsTerminal(item)) ids.add(traceId);
    }
  }
  return Array.from(ids).sort();
}

function workbenchTraceRowsForTrace(sample, traceId) {
  const rows = Array.isArray(sample?.traceRows) ? sample.traceRows : [];
  return rows.filter((item) => !traceId || item?.traceId === traceId);
}

function workbenchFinalMessageVisible(sample, traceId) {
  const messages = Array.isArray(sample?.messages) ? sample.messages : [];
  return messages.some((item) => (!traceId || item?.traceId === traceId) && workbenchDomItemLooksFinal(item));
}

function workbenchTerminalTurnVisible(sample, traceId) {
  const turns = Array.isArray(sample?.turns) ? sample.turns : [];
  return turns.some((item) => (!traceId || item?.traceId === traceId) && workbenchDomItemIsTerminal(item));
}

function workbenchDomItemIsTerminal(item) {
  const status = String(item?.status || "").toLowerCase();
  if (/^(completed|complete|succeeded|success|failed|failure|error|canceled|cancelled|done)$/u.test(status)) return true;
  return isTerminalTraceText([item?.status, item?.textPreview, item?.text, item?.durationText, item?.activityText].filter(Boolean).join(" "));
}

function workbenchDomItemLooksFinal(item) {
  const text = [item?.status, item?.textPreview, item?.text].filter(Boolean).join(" ");
  return workbenchDomItemIsTerminal(item) && isFinalResultText(text);
}

function buildWorkbenchTurnStateTriadMetrics(samples, timeline = []) {
  const rows = [];
  const sourceSamples = Array.isArray(samples) ? samples : [];
  for (let index = 0; index < sourceSamples.length; index += 1) {
    const sample = sourceSamples[index];
    if (!isWorkbenchPathSample(sample)) continue;
    const turns = Array.isArray(sample?.turns) ? sample.turns.filter((turn) => String(turn?.role || turn?.dataRole || "agent") === "agent") : [];
    if (turns.length === 0) continue;
    const rail = activeSessionRailItemForSample(sample);
    for (const turn of turns.slice(-6)) {
      const row = workbenchTurnStateTriadRow(sample, turn, rail, timeline[index]?.promptIndex ?? 0);
      if (row) rows.push(row);
    }
  }
  const invalidFullTriads = rows.filter((row) => row.invalid === true && row.fullTriad === true);
  const cardFinalResponseMismatches = rows.filter((row) => row.cardFinalResponseMismatch === true || row.legacyCardFinalResponseMismatch === true);
  const collectorMissingRows = rows.filter((row) => Array.isArray(row.collectorMissing) && row.collectorMissing.length > 0);
  const invalidRowKeys = new Set([...invalidFullTriads, ...cardFinalResponseMismatches].map((row) => row.rowKey));
  const collectorMissingFields = uniqueSorted(collectorMissingRows.flatMap((row) => row.collectorMissing || []));
  const offendingRows = Array.from(new Map([...invalidFullTriads, ...cardFinalResponseMismatches].map((row) => [row.rowKey, row])).values());
  const drilldown = buildWorkbenchTurnStateTriadDrilldown(offendingRows);
  return {
    summary: {
      sampleCount: sourceSamples.length,
      rowCount: rows.length,
      fullTriadRowCount: rows.filter((row) => row.fullTriad === true).length,
      invalidRowCount: invalidRowKeys.size,
      invalidFullTriadCount: invalidFullTriads.length,
      cardFinalResponseMismatchCount: cardFinalResponseMismatches.length,
      invalidGroupCount: drilldown.summary.groupCount,
      invalidTraceIdCount: drilldown.summary.traceIds.length,
      invalidMaxObservedSpanMs: drilldown.summary.maxObservedSpanMs,
      collectorMissingRowCount: collectorMissingRows.length,
      collectorMissingFields,
      valuesRedacted: true
    },
    drilldown,
    invalidFullTriads: invalidFullTriads.slice(0, 120),
    cardFinalResponseMismatches: cardFinalResponseMismatches.slice(0, 120),
    collectorMissingRows: collectorMissingRows.slice(0, 120),
    timeline: rows.slice(-300),
    valuesRedacted: true
  };
}

function buildWorkbenchTurnStateTriadDrilldown(rows) {
  const uniqueRows = Array.from(new Map((Array.isArray(rows) ? rows : [])
    .filter(Boolean)
    .map((row) => [row?.rowKey || [row?.seq, row?.traceId, row?.messageId, row?.pageRole].join("|"), row])).values());
  const groupsByKey = new Map();
  let firstAt = null;
  let lastAt = null;
  for (const row of uniqueRows) {
    const traceId = firstString(row?.traceId);
    const mismatchKind = workbenchTriadMismatchKind(row);
    const tuple = workbenchTriadTuple(row);
    const key = [
      traceId || row?.messageId || row?.sessionIdPrefix || "-",
      row?.sessionIdPrefix || "-",
      row?.pageRole || "-",
      mismatchKind,
      tuple,
    ].join("|");
    let group = groupsByKey.get(key);
    if (!group) {
      group = {
        keyHash: sha256(key),
        mismatchKind,
        statusTuple: tuple,
        traceId: traceId || null,
        messageId: row?.messageId ?? null,
        sessionIdPrefix: row?.sessionIdPrefix ?? null,
        pageRole: row?.pageRole ?? null,
        pageId: row?.pageId ?? null,
        count: 0,
        firstSeq: row?.seq ?? null,
        lastSeq: row?.seq ?? null,
        firstAt: row?.ts ?? null,
        lastAt: row?.ts ?? null,
        promptIndexes: new Set(),
        commandIds: new Set(),
        rawRailStatuses: new Set(),
        rawCardStatuses: new Set(),
        finalResponseTextBytes: new Set(),
        examples: [],
        valuesRedacted: true,
      };
      groupsByKey.set(key, group);
    }
    group.count += 1;
    group.firstSeq = minNumberOrValue(group.firstSeq, row?.seq);
    group.lastSeq = maxNumberOrValue(group.lastSeq, row?.seq);
    group.firstAt = minIso(group.firstAt, row?.ts ?? null);
    group.lastAt = maxIso(group.lastAt, row?.ts ?? null);
    firstAt = minIso(firstAt, row?.ts ?? null);
    lastAt = maxIso(lastAt, row?.ts ?? null);
    if (row?.promptIndex !== null && row?.promptIndex !== undefined) group.promptIndexes.add(String(row.promptIndex));
    if (row?.nearestCommandId) group.commandIds.add(String(row.nearestCommandId));
    if (row?.railStatusRaw) group.rawRailStatuses.add(String(row.railStatusRaw));
    if (row?.cardStatusRaw) group.rawCardStatuses.add(String(row.cardStatusRaw));
    if (row?.finalResponseTextBytes !== null && row?.finalResponseTextBytes !== undefined) group.finalResponseTextBytes.add(String(row.finalResponseTextBytes));
    if (group.examples.length < 3) {
      group.examples.push({
        seq: row?.seq ?? null,
        ts: row?.ts ?? null,
        traceId,
        railStatus: row?.railStatus ?? null,
        railStatusRaw: row?.railStatusRaw ?? null,
        cardStatus: row?.cardStatus ?? null,
        cardStatusRaw: row?.cardStatusRaw ?? null,
        finalResponsePresent: row?.finalResponsePresent ?? null,
        finalResponseTextBytes: row?.finalResponseTextBytes ?? null,
        nearestCommandId: row?.nearestCommandId ?? null,
        valuesRedacted: true,
      });
    }
  }
  const groups = Array.from(groupsByKey.values()).map((group) => {
    const observedSpanMs = isoSpanMs(group.firstAt, group.lastAt);
    return {
      keyHash: group.keyHash,
      mismatchKind: group.mismatchKind,
      statusTuple: group.statusTuple,
      traceId: group.traceId,
      messageId: group.messageId,
      sessionIdPrefix: group.sessionIdPrefix,
      pageRole: group.pageRole,
      pageId: group.pageId,
      count: group.count,
      firstSeq: group.firstSeq,
      lastSeq: group.lastSeq,
      firstAt: group.firstAt,
      lastAt: group.lastAt,
      observedSpanMs,
      promptIndexes: Array.from(group.promptIndexes).slice(0, 8),
      commandIds: Array.from(group.commandIds).slice(0, 8),
      rawRailStatuses: Array.from(group.rawRailStatuses).slice(0, 8),
      rawCardStatuses: Array.from(group.rawCardStatuses).slice(0, 8),
      finalResponseTextBytes: Array.from(group.finalResponseTextBytes).slice(0, 8),
      examples: group.examples,
      valuesRedacted: true,
    };
  }).sort((left, right) => Number(right.observedSpanMs ?? 0) - Number(left.observedSpanMs ?? 0) || Number(right.count ?? 0) - Number(left.count ?? 0));
  const traceIds = uniqueSorted(uniqueRows.map((row) => row?.traceId).filter(Boolean)).slice(0, 12);
  const sessionPrefixes = uniqueSorted(uniqueRows.map((row) => row?.sessionIdPrefix).filter(Boolean)).slice(0, 12);
  const mismatchKinds = uniqueSorted(uniqueRows.map(workbenchTriadMismatchKind).filter(Boolean));
  return {
    summary: {
      invalidUniqueRows: uniqueRows.length,
      groupCount: groups.length,
      traceIds,
      sessionPrefixes,
      mismatchKinds,
      firstAt,
      lastAt,
      maxObservedSpanMs: groups.reduce((value, item) => Math.max(value, Number(item.observedSpanMs ?? 0)), 0),
      valuesRedacted: true,
    },
    groups: groups.slice(0, 12),
    otelDrilldown: buildWorkbenchTriadOtelDrilldown(traceIds.slice(0, 4)),
    staticSourceHints: workbenchTriadStaticSourceHints(),
    unitTestReproHints: workbenchTriadUnitTestReproHints(),
    valuesRedacted: true,
  };
}

function buildWorkbenchTriadOtelDrilldown(traceIds) {
  const target = otelTargetForAnalyzer();
  const ids = (Array.isArray(traceIds) ? traceIds : []).filter(Boolean).slice(0, 4);
  return {
    target,
    commands: ids.flatMap((traceId) => [
      "bun scripts/cli.ts platform-infra observability diagnose-code-agent --target " + target + " --business-trace-id " + traceId + " --full",
      "bun scripts/cli.ts platform-infra observability trace --target " + target + " --trace-id <otel-trace-id-from-diagnose> --grep session_ --limit 60 --full",
      "bun scripts/cli.ts platform-infra observability trace --target " + target + " --trace-id <otel-trace-id-from-diagnose> --grep turn_status_read --limit 40 --full",
      "bun scripts/cli.ts platform-infra observability trace --target " + target + " --trace-id <otel-trace-id-from-diagnose> --grep projection --limit 120 --full",
    ]).slice(0, 16),
    valuesRedacted: true,
  };
}

function otelTargetForAnalyzer() {
  const explicit = firstString(process.env.UNIDESK_WEB_OBSERVE_OTEL_TARGET, process.env.UNIDESK_OBSERVABILITY_TARGET);
  if (explicit) return explicit;
  const parts = String(stateDir || "").split(/[\\\/]+/u);
  const index = parts.lastIndexOf("web-observe");
  if (index >= 0 && parts[index + 1]) return String(parts[index + 1]).toUpperCase();
  return "JD01";
}

function workbenchTriadMismatchKind(row) {
  if (!row || typeof row !== "object") return "unknown";
  if (row.railCardMismatch === true) return "rail-card-status-mismatch";
  if (row.cardFinalResponseMismatch === true) return "completed-card-final-response-absent";
  if (row.legacyCardFinalResponseMismatch === true) return "completed-card-final-response-uncollected-or-absent";
  if (row.tupleAllowed === false) return "tuple-not-allowed";
  return "unknown";
}

function workbenchTriadRootCauseFromDrilldown(drilldown, summary = {}) {
  const groups = Array.isArray(drilldown?.groups) ? drilldown.groups : [];
  const hasStaleCompletedRail = groups.some((group) => group?.mismatchKind === "rail-card-status-mismatch" && String(group?.statusTuple || "").includes("rail=completed,card=running,final=false"));
  if (hasStaleCompletedRail) return {
    rootCause: "workbench_session_rail_status_stale_after_new_running_turn",
    rootCauseStatus: "confirmed-from-dom-samples",
    rootCauseConfidence: "high",
    dominantMismatchKind: "rail-card-status-mismatch",
    summary: "Workbench session rail kept the previous completed terminal status while a newer turn card was running and Final Response was absent",
    nextAction: "Inspect HWLAB frontend session status authority/reducer, especially workbench-server-state sessionStatusAuthorityFromMessages and SessionRail sessionToSessionTab status input; session rail must derive from the latest active turn/message authority rather than the previous sealed terminal message.",
    sourceOfTruth: "latest durable Workbench turn/message projection for the active session",
    valuesRedacted: true,
  };
  const finalMismatchCount = Number(summary?.cardFinalResponseMismatchCount ?? 0);
  const hasFinalMismatch = finalMismatchCount > 0 || groups.some((group) => /final=false/u.test(String(group?.statusTuple || "")) && group?.mismatchKind !== "rail-card-status-mismatch");
  if (hasFinalMismatch) return {
    rootCause: "workbench_terminal_final_response_not_sealed",
    rootCauseStatus: "confirmed-from-dom-samples",
    rootCauseConfidence: "high",
    dominantMismatchKind: "completed-card-final-response-absent",
    summary: "Workbench terminal turn card did not expose a structured Final Response body",
    nextAction: "Inspect HWLAB terminal message/finalResponse projection contract before changing renderer fallback behavior.",
    sourceOfTruth: "durable Workbench terminal message projection",
    valuesRedacted: true,
  };
  const mismatchKinds = Array.isArray(drilldown?.summary?.mismatchKinds) ? drilldown.summary.mismatchKinds : [];
  return {
    rootCause: "workbench_projection_state_triad_not_sealed",
    rootCauseStatus: "confirmed-from-dom-samples",
    rootCauseConfidence: "high",
    dominantMismatchKind: mismatchKinds[0] ?? "unknown",
    summary: "Workbench session rail status, turn card status, and Final Response body presence diverged from the allowed state tuples",
    nextAction: "Use drilldown.otelDrilldown.commands for the listed traceIds, then inspect staticSourceHints and add unit tests from unitTestReproHints before changing UI rendering.",
    sourceOfTruth: "durable Workbench projection/read model",
    valuesRedacted: true,
  };
}

function workbenchTriadTuple(row) {
  return [
    "rail=" + (row?.railStatus ?? "-"),
    "card=" + (row?.cardStatus ?? "-"),
    "final=" + String(row?.finalResponsePresent ?? "unknown"),
  ].join(",");
}

function minNumberOrValue(left, right) {
  const l = Number(left);
  const r = Number(right);
  if (!Number.isFinite(l)) return right ?? left ?? null;
  if (!Number.isFinite(r)) return left ?? right ?? null;
  return Math.min(l, r);
}

function maxNumberOrValue(left, right) {
  const l = Number(left);
  const r = Number(right);
  if (!Number.isFinite(l)) return right ?? left ?? null;
  if (!Number.isFinite(r)) return left ?? right ?? null;
  return Math.max(l, r);
}

function isoSpanMs(firstAt, lastAt) {
  const start = Date.parse(firstAt || "");
  const end = Date.parse(lastAt || "");
  if (!Number.isFinite(start) || !Number.isFinite(end) || end < start) return 0;
  return end - start;
}

function workbenchTriadStaticSourceHints() {
  return [
    { repo: "pikasTech/HWLAB", path: "web/hwlab-cloud-web/src/stores/workbench-session.ts", reason: "session rail/list status and active session projection source" },
    { repo: "pikasTech/HWLAB", path: "web/hwlab-cloud-web/src/stores/workbench-server-state.ts", reason: "server snapshot merge path that can overwrite sealed turn state" },
    { repo: "pikasTech/HWLAB", path: "web/hwlab-cloud-web/src/stores/workbench-message-projection-runtime.ts", reason: "turn card and Final Response projection/runtime merge path" },
    { repo: "pikasTech/HWLAB", path: "internal/cloud/server-workbench-http*.go", reason: "session list/detail/messages/turn REST read-model contract" },
    { repo: "pikasTech/HWLAB", path: "internal/cloud/workbench-projection-*.go", reason: "durable projection writer and terminal seal contract" },
  ];
}

function workbenchTriadUnitTestReproHints() {
  return [
    "frontend reducer: when a second trace is running in the same session, session rail status must not stay on the previous completed terminal trace",
    "backend projector: terminal event must produce a single sealed turn tuple consumed by session list, session detail, messages and turn-status APIs",
    "backend read model: completed rail status must not coexist with running turn card or missing Final Response for the same trace",
    "frontend server-state merge: stale running/empty snapshots must not overwrite a sealed completed+Final Response turn",
    "frontend projection runtime: cross-page hydration must converge from the same durable projection without DOM-only repair",
  ];
}

function workbenchTurnStateTriadRow(sample, turn, rail, promptIndex) {
  const collectorMissing = [];
  const railRawStatus = firstString(rail?.status, rail?.dataStatus);
  const railRunning = rail?.running === true || String(rail?.dataRunning || rail?.ariaBusy || "").toLowerCase() === "true";
  const railStatus = normalizeWorkbenchTriadStatus(railRawStatus, railRunning);
  if (!rail) collectorMissing.push("sessionRail.activeItem");
  if (!railRawStatus && railRunning !== true) collectorMissing.push("sessionRail.status");
  const cardRawStatus = firstString(turn?.status);
  const cardStatus = normalizeWorkbenchTriadStatus(cardRawStatus, false) || (workbenchDomItemIsTerminal(turn) ? "completed" : null);
  if (!cardRawStatus && !cardStatus) collectorMissing.push("turn.status");
  const finalPresence = finalResponsePresenceFromTurn(turn);
  if (finalPresence.known !== true) collectorMissing.push("turn.finalResponseTextBytes");
  const fullTriad = Boolean(railStatus && cardStatus && finalPresence.known === true);
  const finalResponsePresent = finalPresence.known === true ? finalPresence.present : null;
  const tupleAllowed = fullTriad
    ? (railStatus === "completed" && cardStatus === "completed" && finalResponsePresent === true)
      || (railStatus === "running" && cardStatus === "running" && finalResponsePresent === false)
    : null;
  const cardFinalResponseMismatch = cardStatus === "completed" && finalPresence.known === true && finalResponsePresent !== true;
  const legacyCardFinalResponseMismatch = cardStatus === "completed" && finalPresence.known !== true && !workbenchDomItemLooksFinal(turn);
  const railCardMismatch = Boolean(railStatus && cardStatus && railStatus !== cardStatus);
  const invalid = tupleAllowed === false || cardFinalResponseMismatch || legacyCardFinalResponseMismatch || railCardMismatch;
  const traceId = firstString(turn?.traceId, turn?.turnId);
  const messageId = firstString(turn?.messageId);
  const rowKey = [
    sample?.seq ?? "-",
    sample?.pageRole ?? "control",
    sample?.pageId ?? "default",
    sample?.routeSessionId ?? sample?.activeSessionId ?? rail?.sessionIdPrefix ?? "-",
    traceId ?? messageId ?? turn?.index ?? "-"
  ].join("|");
  return {
    ...ref(sample),
    rowKey,
    promptIndex,
    sessionIdPrefix: sessionPrefixForSample(sample, rail),
    traceId,
    messageId,
    turnId: firstString(turn?.turnId),
    turnIndex: turn?.index ?? null,
    railStatus,
    railStatusRaw: railRawStatus ?? null,
    railRunning: railRunning === true,
    railSource: rail ? "sessionRail.activeItem" : null,
    cardStatus,
    cardStatusRaw: cardRawStatus ?? null,
    finalResponsePresent,
    finalResponseTextBytes: turn?.finalResponseTextBytes !== null && turn?.finalResponseTextBytes !== undefined && Number.isFinite(Number(turn.finalResponseTextBytes)) ? Number(turn.finalResponseTextBytes) : null,
    finalResponseSource: turn?.finalResponseTextSource ?? null,
    finalResponseTextHash: turn?.finalResponseTextHash ?? null,
    finalResponseTextPreview: turn?.finalResponseTextPreview ? limitText(turn.finalResponseTextPreview, 160) : null,
    fullTriad,
    tupleAllowed,
    invalid,
    cardFinalResponseMismatch,
    legacyCardFinalResponseMismatch,
    railCardMismatch,
    collectorMissing,
    nearestCommandId: sample?.commandId ?? null,
    relatedChecks: ["WBC-001", "WBC-003", "WBC-011", "WBC-022"],
    valuesRedacted: true
  };
}

function activeSessionRailItemForSample(sample) {
  const rail = sample?.sessionRail && typeof sample.sessionRail === "object" ? sample.sessionRail : null;
  if (!rail) return null;
  const items = Array.isArray(rail.items) ? rail.items : [];
  if (rail.activeItem) return rail.activeItem;
  const routeSessionId = String(sample?.routeSessionId || "");
  const activeSessionId = String(sample?.activeSessionId || "");
  return items.find((item) => item?.active === true)
    || items.find((item) => sessionRailItemMatchesSession(item, activeSessionId))
    || items.find((item) => sessionRailItemMatchesSession(item, routeSessionId))
    || null;
}

function sessionRailItemMatchesSession(item, sessionId) {
  const id = String(sessionId || "");
  const prefix = String(item?.sessionIdPrefix || item?.sessionId || "");
  return Boolean(id && prefix && (id === prefix || id.startsWith(prefix) || prefix.startsWith(id)));
}

function sessionPrefixForSample(sample, rail) {
  const id = firstString(sample?.activeSessionId, sample?.routeSessionId, rail?.sessionIdPrefix, rail?.sessionId);
  return id ? String(id).slice(0, 12) : null;
}

function finalResponsePresenceFromTurn(turn) {
  if (!turn || typeof turn !== "object") return { known: false, present: null };
  if (turn.finalResponseTextBytes !== null && turn.finalResponseTextBytes !== undefined && Number.isFinite(Number(turn.finalResponseTextBytes))) {
    const bytes = Number(turn.finalResponseTextBytes);
    return { known: true, present: bytes > 0 };
  }
  if (Object.prototype.hasOwnProperty.call(turn, "finalResponsePresent") && turn.finalResponsePresent !== null && turn.finalResponsePresent !== undefined) {
    return { known: true, present: turn.finalResponsePresent === true };
  }
  return { known: false, present: null };
}

function normalizeWorkbenchTriadStatus(status, running = false) {
  const value = String(status || "").trim().toLowerCase().replace(/_/gu, "-");
  if (running === true) return "running";
  if (!value) return null;
  if (/^(completed|complete|succeeded|success|finished|done|terminal|sealed)$/u.test(value)) return "completed";
  if (/^(failed|failure|error|blocked|timeout|canceled|cancelled|stale|thread-resume-failed|interrupted|expired|idle)$/u.test(value)) return "completed";
  if (/^(pending|running|active|busy|admitted|dispatching|executing|streaming|processing|queued|in-progress|creating)$/u.test(value)) return "running";
  return null;
}

function firstString(...values) {
  for (const value of values) {
    if (typeof value !== "string") continue;
    const text = value.trim();
    if (text) return text;
  }
  return null;
}

function promptCommandHasAuthoritativeSubmitSideEffect(control, promptRound) {
  const commandId = stringOrNull(promptRound?.promptCommandId);
  if (!commandId) return false;
  const row = (control || []).find((item) => item?.type === "sendPrompt" && item?.phase === "completed" && item?.commandId === commandId);
  const detail = objectValue(row?.detail);
  const chatSubmit = objectValue(detail.chatSubmit);
  const sideEffect = objectValue(chatSubmit.sideEffect);
  return chatSubmit.sideEffectObserved === true
    || sideEffect.submitted === true
    || Number(sideEffect.messageCountDelta ?? 0) > 0;
}
`;
}