feat: AI triage suggestion — severity + DOSH flags pre-fill

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FFDuBhMKvoWjrWT3ZnGmmr

app/api/incidents/[id]/ai/triage-suggest/route.ts

@@ -0,0 +1,105 @@
+export const dynamic = 'force-dynamic'
+
+import { NextRequest, NextResponse } from 'next/server'
+import { createClient } from '@/lib/supabase/server'
+import { anthropic } from '@/lib/claude/client'
+
+export async function POST(
+  _request: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  const { id } = await params
+  const supabase = await createClient()
+  const { data: { user }, error: authError } = await supabase.auth.getUser()
+  if (authError || !user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+
+  const { data: profile } = await supabase.from('users').select('role').eq('id', user.id).single()
+  if (!profile || !['hse', 'admin'].includes(profile.role))
+    return NextResponse.json({ error: 'Forbidden' }, { status: 403 })
+
+  const { data: incident } = await supabase
+    .from('incidents')
+    .select('id, incident_type, description, injury_involved, asset_involved, medical_status')
+    .eq('id', id)
+    .single()
+  if (!incident) return NextResponse.json({ error: 'Not found' }, { status: 404 })
+
+  const inc = incident as {
+    incident_type: string
+    description: string
+    injury_involved: boolean
+    asset_involved: boolean
+    medical_status: string | null
+  }
+
+  const message = await anthropic.messages.create({
+    model: 'claude-opus-4-8',
+    thinking: { type: 'adaptive' },
+    max_tokens: 1024,
+    tools: [{
+      name: 'suggest_triage',
+      description: 'Suggest severity rating and NADOPOD 2004 DOSH classification for a warehouse incident',
+      input_schema: {
+        type: 'object' as const,
+        properties: {
+          severity: { type: 'number', description: '1=minor, 2=low, 3=moderate, 4=serious, 5=critical/fatality' },
+          is_fatality: { type: 'boolean' },
+          is_serious_bodily_injury: { type: 'boolean', description: 'Fracture, amputation, blindness, serious burn, or similar' },
+          is_dangerous_occurrence: { type: 'boolean', description: 'Structural collapse, explosion, fire, scaffold collapse, etc.' },
+          is_occupational_disease: { type: 'boolean', description: 'Disease arising from workplace exposure' },
+          rationale: { type: 'string', description: 'One-sentence rationale citing NADOPOD 2004 where applicable' },
+        },
+        required: [
+          'severity', 'is_fatality', 'is_serious_bodily_injury',
+          'is_dangerous_occurrence', 'is_occupational_disease', 'rationale',
+        ],
+      },
+    }],
+    tool_choice: { type: 'tool', name: 'suggest_triage' },
+    messages: [{
+      role: 'user',
+      content: `You are an HSE triage specialist for a Malaysian 3PL warehouse. Assess this incident under NADOPOD 2004.
+
+Incident type: ${inc.incident_type}
+Description: ${inc.description}
+Injury involved: ${inc.injury_involved ? 'yes' : 'no'}
+Medical status: ${inc.medical_status ?? 'N/A'}
+Asset/equipment involved: ${inc.asset_involved ? 'yes' : 'no'}
+
+Suggest severity (1–5) and tick the appropriate NADOPOD 2004 flags. Give a one-sentence rationale.`,
+    }],
+  })
+
+  const toolBlock = message.content.find(b => b.type === 'tool_use')
+  if (!toolBlock || toolBlock.type !== 'tool_use')
+    return NextResponse.json({ error: 'AI suggestion failed' }, { status: 500 })
+
+  const input = toolBlock.input as {
+    severity?: unknown
+    is_fatality?: unknown
+    is_serious_bodily_injury?: unknown
+    is_dangerous_occurrence?: unknown
+    is_occupational_disease?: unknown
+    rationale?: unknown
+  }
+
+  if (
+    typeof input.severity !== 'number' ||
+    typeof input.is_fatality !== 'boolean' ||
+    typeof input.is_serious_bodily_injury !== 'boolean' ||
+    typeof input.is_dangerous_occurrence !== 'boolean' ||
+    typeof input.is_occupational_disease !== 'boolean' ||
+    typeof input.rationale !== 'string'
+  ) {
+    return NextResponse.json({ error: 'AI returned unexpected structure' }, { status: 500 })
+  }
+
+  await supabase.rpc('write_audit_log', {
+    p_table_name: 'incidents',
+    p_record_id: id,
+    p_action: 'ai_triage_suggest',
+    p_new_value: { suggestion: toolBlock.input, model: 'claude-opus-4-8' } as never,
+  })
+
+  return NextResponse.json(toolBlock.input)
+}

components/incidents/triage-form.tsx

@@ -27,6 +27,8 @@ export function TriageForm({ incidentId, currentSeverity }: Props) {
   const [triageNotes, setTriageNotes] = useState('')
   const [saving, setSaving] = useState(false)
   const [error, setError] = useState<string | null>(null)
+  const [aiLoading, setAiLoading] = useState(false)
+  const [aiRationale, setAiRationale] = useState<string | null>(null)
 
   const dosh = computeDoshObligation({
     is_fatality: isFatality,
@@ -36,6 +38,33 @@ export function TriageForm({ incidentId, currentSeverity }: Props) {
     lost_days: null,
   })
 
+  async function getAiSuggestion() {
+    setAiLoading(true)
+    setAiRationale(null)
+    try {
+      const res = await fetch(`/api/incidents/${incidentId}/ai/triage-suggest`, { method: 'POST' })
+      if (!res.ok) return
+      const data = await res.json() as {
+        severity: number
+        is_fatality: boolean
+        is_serious_bodily_injury: boolean
+        is_dangerous_occurrence: boolean
+        is_occupational_disease: boolean
+        rationale: string
+      }
+      setSeverity(data.severity)
+      setIsFatality(data.is_fatality)
+      setIsSBI(data.is_serious_bodily_injury)
+      setIsDO(data.is_dangerous_occurrence)
+      setIsOD(data.is_occupational_disease)
+      setAiRationale(data.rationale)
+    } catch {
+      // Non-blocking — user can still triage manually
+    } finally {
+      setAiLoading(false)
+    }
+  }
+
   async function handleSubmit(e: React.FormEvent) {
     e.preventDefault()
     setSaving(true)
@@ -120,15 +149,33 @@ export function TriageForm({ incidentId, currentSeverity }: Props) {
         />
       </div>
 
+      {aiRationale && (
+        <div className="rounded-lg bg-purple-50 border border-purple-200 p-3">
+          <p className="text-xs font-semibold text-purple-700 mb-1">AI Suggestion Rationale</p>
+          <p className="text-xs text-purple-600">{aiRationale}</p>
+          <p className="text-xs text-purple-400 mt-1">Fields pre-filled — review before submitting.</p>
+        </div>
+      )}
+
       {error && <p className="text-sm text-red-600">{error}</p>}
 
+      <div className="flex gap-3">
+        <button
+          type="button"
+          onClick={getAiSuggestion}
+          disabled={aiLoading || saving}
+          className="flex-1 bg-purple-50 text-purple-700 border border-purple-300 rounded-lg py-2 text-sm font-semibold disabled:opacity-50 hover:bg-purple-100"
+        >
+          {aiLoading ? 'Getting suggestion…' : 'Get AI Suggestion'}
+        </button>
         <button
           type="submit"
           disabled={saving}
-        className="w-full bg-blue-600 text-white rounded-lg py-2 text-sm font-semibold disabled:opacity-50"
+          className="flex-1 bg-blue-600 text-white rounded-lg py-2 text-sm font-semibold disabled:opacity-50"
         >
           {saving ? 'Saving…' : 'Complete Triage'}
         </button>
+      </div>
     </form>
   )
 }

tests/api/incidents/triage-suggest.test.ts

@@ -0,0 +1,60 @@
+import { describe, it, expect, vi } from 'vitest'
+
+const mockIncident = {
+  id: 'inc-1',
+  incident_type: 'injury',
+  description: 'Worker slipped on wet floor in cold store, fractured wrist.',
+  injury_involved: true,
+  asset_involved: false,
+  medical_status: 'medical_treatment',
+}
+
+vi.mock('@/lib/supabase/server', () => ({
+  createClient: vi.fn().mockResolvedValue({
+    auth: {
+      getUser: vi.fn().mockResolvedValue({ data: { user: { id: 'user-1' } }, error: null }),
+    },
+    from: vi.fn().mockReturnValue({
+      select: vi.fn().mockReturnThis(),
+      eq: vi.fn().mockReturnThis(),
+      single: vi.fn()
+        .mockResolvedValueOnce({ data: { role: 'hse' } }) // profile
+        .mockResolvedValueOnce({ data: mockIncident }),    // incident
+    }),
+    rpc: vi.fn().mockResolvedValue({ error: null }),
+  }),
+}))
+
+vi.mock('@/lib/claude/client', () => ({
+  anthropic: {
+    messages: {
+      create: vi.fn().mockResolvedValue({
+        content: [{
+          type: 'tool_use',
+          name: 'suggest_triage',
+          input: {
+            severity: 3,
+            is_fatality: false,
+            is_serious_bodily_injury: true,
+            is_dangerous_occurrence: false,
+            is_occupational_disease: false,
+            rationale: 'Fracture constitutes serious bodily injury under NADOPOD 2004.',
+          },
+        }],
+      }),
+    },
+  },
+}))
+
+describe('POST /api/incidents/[id]/ai/triage-suggest', () => {
+  it('returns triage suggestion with severity and DOSH flags', async () => {
+    const { POST } = await import('@/app/api/incidents/[id]/ai/triage-suggest/route')
+    const req = new Request('http://localhost/api/incidents/inc-1/ai/triage-suggest', { method: 'POST' })
+    const res = await POST(req as never, { params: Promise.resolve({ id: 'inc-1' }) })
+    expect(res.status).toBe(200)
+    const body = await res.json()
+    expect(body.severity).toBe(3)
+    expect(body.is_serious_bodily_injury).toBe(true)
+    expect(body.rationale).toBeTruthy()
+  })
+})