Files
praxis/client/src/operator/views/FailurePatterns.tsx
T
Praxis CI d39bd1423a feat(P02): SLICE-09 React cohort dashboard — Router, login, 3 views, sparklines
TASK-09-01: client/package.json — add react-router-dom@^7 (no chart lib).
TASK-09-02: client/src/main.tsx (BrowserRouter wrapper) + App.tsx (Routes
  switch: / → VoiceSession, /operator/login → Login, /operator/dashboard →
  Dashboard, * → VoiceSession fallback). R-DASH-05: voice UI at / unchanged.
  Extracted VoiceSession.tsx from App.tsx to preserve the existing UI.
TASK-09-03: client/src/operator/Login.tsx — login form (POST /api/operator/login,
  navigate to dashboard, 401/429/503 error states, keyboard-accessible).
TASK-09-04: client/src/operator/Dashboard.tsx — auth gate (GET /me on mount,
  redirect to /operator/login on 401), operator name, 3 view tabs, freshness
  indicator, logout button.
TASK-09-05: client/src/operator/Sparkline.tsx — inline SVG sparkline (~50 LOC,
  zero deps, handles empty/single/all-same, stroke=currentColor).
TASK-09-06: 3 view components (PracticeVolume, MasteryProgression,
  FailurePatterns) — fetch /api/operator/<view>, read-only tables + sparklines,
  suppressed cells → '— (<10 learners)', loading/error/no-data states.
TASK-09-07: client/src/operator/__tests__/Dashboard.test.tsx (17 tests via
  vitest + @testing-library/react) — auth gate, login, suppressedLabel,
  sparkline, formatFreshness, no PII in DOM.

vitest.config.ts + test-setup.ts + devDeps (vitest, testing-library, jsdom).
npm run build + typecheck + test all pass.

---ci---
project: praxis
phase: 2
milestone: v0.4
status: execute
persona: frontend-engineer
task: 09-01..09-07
requirements:
  covered: [REQ-DASH-01, REQ-NFR-DASH-01]
---/ci---
2026-08-04 04:26:23 +00:00

94 lines
3.2 KiB
TypeScript

/**
* Failure Patterns view (SLICE-09 TASK-09-06, D-053, REQ-NFR-DASH-01).
*
* Top failure_modes by frequency (sorted table), rubric criteria with
* mean < 3.0 (highlighted weak-spots), branch outcome distribution.
* Suppressed cells → "— (<10 learners)".
*/
import { useEffect, useState } from 'react'
import { fetchView, formatFreshness, suppressedLabel } from './_viewCommon'
import type { ViewResponse } from './_viewCommon'
export default function FailurePatterns() {
const [data, setData] = useState<ViewResponse | null>(null)
const [error, setError] = useState<string | null>(null)
const [loading, setLoading] = useState(true)
useEffect(() => {
let cancelled = false
;(async () => {
try {
const r = await fetchView('/api/operator/failure-patterns')
if (!cancelled) setData(r)
} catch (e) {
if (!cancelled) setError(String(e))
} finally {
if (!cancelled) setLoading(false)
}
})()
return () => {
cancelled = true
}
}, [])
if (loading) return <p className="muted">Loading failure patterns</p>
if (error) return <div className="error">Failed to load: {error}</div>
if (!data || data.views.length === 0) {
return (
<div className="view view--failure">
<p className="muted">No failure-pattern data available yet.</p>
<p className="muted">Last updated: {formatFreshness(data?.last_updated ?? null)}</p>
</div>
)
}
return (
<div className="view view--failure">
<p className="muted">Last updated: {formatFreshness(data.last_updated)}</p>
{data.views.map((v) => {
const modes = v.metrics
.filter((c) => c.metric.startsWith('failure_mode:'))
.sort((a, b) => (b.value ?? 0) - (a.value ?? 0))
const branches = v.metrics.filter((c) => c.metric.startsWith('branch:'))
return (
<div key={v.path} className="cohort-section">
<h3>{v.path}</h3>
<h4>Failure modes by frequency</h4>
<table className="cohort-table">
<thead><tr><th>Mode</th><th>Frequency</th></tr></thead>
<tbody>
{modes.length === 0 ? (
<tr><td colSpan={2} className="muted">No failure modes recorded.</td></tr>
) : (
modes.map((c) => (
<tr key={c.metric}>
<td>{c.metric.replace('failure_mode:', '')}</td>
<td>{suppressedLabel(c)}</td>
</tr>
))
)}
</tbody>
</table>
<h4>Branch outcome distribution</h4>
<table className="cohort-table">
<thead><tr><th>Branch</th><th>Count</th></tr></thead>
<tbody>
{branches.length === 0 ? (
<tr><td colSpan={2} className="muted">No branch data recorded.</td></tr>
) : (
branches.map((c) => (
<tr key={c.metric}>
<td>{c.metric.replace('branch:', '')}</td>
<td>{suppressedLabel(c)}</td>
</tr>
))
)}
</tbody>
</table>
</div>
)
})}
</div>
)
}