Codex 5.3 Refactor Note: Canonical refactor plan: docs/CODEX-5.3-REFACTOR-PLAN.md. This document is retained for historical and implementation context during the refactor.

W10 Delivery Summary

Status: ✅ COMPLETE

What's Delivered

📦 Code (6 Files)

✅ API: GET/POST /api/candidates/[id]/decision (validate, immutable decision, audit logging, event emission)
✅ UI: SmoDecisionTab.tsx (editable form, read-only history, status checks)
✅ Page: Updated candidates/[id]/page.tsx with SMO Decision tab
✅ Validation: decisionSchema in schemas.ts (APPROVED/REJECTED/KIV + notes validation)
✅ Events: emitter.ts stub (console logging; W16 will route to notifications)
✅ Database: No migration needed (Decision model + enums already exist)

📚 Documentation (1 File)

✅ W10-IMPLEMENTATION.md: Full 13-test-case specification (A-H format)

---

🎯 Features Implemented

SMO Decision Management

• ✅ SMO/Admin finalize decision (APPROVED/REJECTED/KIV)
• ✅ Notes required for REJECTED/KIV; optional for APPROVED
• ✅ Decision immutable once created (409 Conflict on retry)
• ✅ Candidate status transitions: TO_SMO → APPROVED/REJECTED/KIV
• ✅ Read-only view after decision finalized
• ✅ Not-in-stage warning if candidate.status != TO_SMO

Audit & Events

• ✅ DECISION_FINALIZED audit event logged
• ✅ CANDIDATE_STATUS_UPDATED audit event logged
• ✅ DecisionUpdated domain event emitted (stub; W16 routes to Company-All)

RBAC & Security

• ✅ Only SMO/Admin can finalize decision
• ✅ HR/Manager/Admin can view decision
• ✅ Non-SMO users see read-only forms
• ✅ Candidate must be TO_SMO to finalize

---

📂 Files Created/Modified

6 Files Total | ~1,200 Lines of Code

src/app/api/candidates/[id]/decision/route.ts (NEW)
  ├─ GET /api/candidates/[id]/decision
  │   ├─ Auth: HR/Manager/SMO/Admin
  │   └─ Returns: { candidateId, decision? }
  │
  └─ POST /api/candidates/[id]/decision
      ├─ Auth: SMO/Admin only
      ├─ Validates: TO_SMO status, notes required for REJECTED/KIV
      ├─ Immutable: 409 if already exists
      ├─ Transactional: Creates Decision + updates Candidate
      ├─ Logs: DECISION_FINALIZED + CANDIDATE_STATUS_UPDATED
      └─ Emits: DecisionUpdated domain event

src/app/(app)/candidates/[id]/_tabs/SmoDecisionTab.tsx (NEW)
  ├─ Editable Form: decision radio + notes textarea
  ├─ Read-Only History: decision card with metadata
  ├─ Status Checks: shows "Not in SMO review stage" if != TO_SMO
  ├─ Validation: Real-time error messages
  └─ UX: Finalize Decision button, Cancel link

src/app/(app)/candidates/[id]/page.tsx (UPDATED)
  ├─ Added: SmoDecisionTab import
  ├─ Added: smo-decision tab button + routing
  └─ Updated: Status badge colors for TO_SMO/APPROVED/REJECTED/KIV

src/lib/validation/schemas.ts (UPDATED)
  ├─ Added: decisionSchema (enum + notes validation)
  └─ Exported: DecisionInput type

src/lib/events/emitter.ts (NEW)
  ├─ emitDomainEvent() function (console logging stub)
  ├─ DomainEventType = 'DecisionUpdated'
  └─ Payload: { candidateId, decision, decidedBy, notes, timestamp }

W10-IMPLEMENTATION.md (NEW)
  ├─ Section A: Summary
  ├─ Section B: Routes (pages + API endpoints)
  ├─ Section C: Data model (no changes needed)
  ├─ Section D: UI components (file breakdown)
  ├─ Section E: API logic (GET/POST flow)
  ├─ Section F: RBAC matrix (role-based access)
  ├─ Section G: Audit events (DECISION_FINALIZED + CANDIDATE_STATUS_UPDATED)
  └─ Section H: Test checklist (13 manual test cases)

---

✅ Acceptance Criteria

• ✅ SMO can finalize decision only when candidate is TO_SMO
• ✅ Reject/KIV require notes; Approve notes optional
• ✅ Decision is immutable once created (second submit returns 409)
• ✅ Candidate status updates to APPROVED/REJECTED/KIV
• ✅ Audit logs written for decision + status change
• ✅ Domain event DecisionUpdated emitted (stub ok)
• ✅ No offer letter upload implemented (out of scope)

---

🧪 Quick Test

1. Setup: Ensure candidate has status TO_SMO
2. Login: As SMO user
3. Navigate: /candidates/[id]?tab=smo-decision
4. Finalize: Select APPROVED, click "Finalize Decision"
5. Verify:
   • ✅ Candidate status updated to APPROVED
   • ✅ Form switches to read-only "Decision finalized"
   • ✅ Server console shows: [DomainEvent] DecisionUpdated: {...}
   • ✅ Audit logs contain: DECISION_FINALIZED + CANDIDATE_STATUS_UPDATED

---

🚀 Next Steps (W11+)

• W11: Offer Letter Management (upload, review, send)
• W12-15: Additional workflows
• W16: Notification Center (consumes DecisionUpdated event via outbox)
• W17-18: Final features