# Test Plan E5.S2 - Error Handling

**Datum:** 27-12-2024
**Status:** Ready for Testing
**Story:** E5.S2 - Error handling (2 SP)

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## ✅ Implementatie Overzicht

### Nieuwe bestanden:
1. **`lib/swift/error-handler.ts`** - Error handling utility met:
   - `isOffline()` - Detect browser offline status
   - `isNetworkError()` - Network error detection
   - `isTimeoutError()` - Timeout detection
   - `parseErrorResponse()` - Parse HTTP error responses
   - `getErrorInfo()` - Generate user-friendly error messages
   - `safeFetch()` - Fetch wrapper met timeout (30s)
   - `retryFetch()` - Retry logic met exponential backoff

2. **`components/swift/command-center/offline-banner.tsx`** - Offline banner component
   - Toont amber banner bij `!navigator.onLine`
   - `useOffline()` hook voor offline detection

### Geüpdatete bestanden:
1. **`components/swift/command-center/command-center.tsx`** - OfflineBanner geïntegreerd
2. **`components/swift/command-center/command-input.tsx`** - Error handling met safeFetch/getErrorInfo
3. **`components/swift/command-center/context-bar.tsx`** - useOffline hook voor margin adjustment
4. **`components/swift/blocks/dagnotitie-block.tsx`** - safeFetch, getErrorInfo, retryFetch
5. **`components/swift/blocks/zoeken-block.tsx`** - safeFetch, getErrorInfo
6. **`components/swift/blocks/overdracht-block.tsx`** - safeFetch, getErrorInfo, retryFetch

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## 🧪 Test Scenarios

### 1. Offline Detection ✅

**Test 1.1: Browser Offline**
- [ ] Open DevTools → Network tab → Throttling → Offline
- [ ] Amber banner verschijnt bovenaan: "Geen internetverbinding"
- [ ] Context bar heeft `marginTop: 40px` (geen overlap)
- [ ] Try een actie (dagnotitie opslaan, patient zoeken)
- [ ] Toast shows: "Geen internetverbinding - Controleer je internetverbinding en probeer het opnieuw."

**Test 1.2: Reconnect**
- [ ] Zet network weer op "Online"
- [ ] Banner verdwijnt automatisch
- [ ] Context bar margin reset
- [ ] Acties werken weer normaal

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### 2. Network Errors

**Test 2.1: API Endpoint Down**
- [ ] Stop de dev server (kill process)
- [ ] Probeer dagnotitie opslaan
- [ ] Toast shows: "Verbinding verbroken - Kon geen verbinding maken met de server."
- [ ] Retry button beschikbaar (voor retryable errors)

**Test 2.2: Timeout (30s)**
- [ ] Simuleer slow API (add `await new Promise(r => setTimeout(r, 35000))` in API route)
- [ ] Probeer actie
- [ ] Na 30 seconden: Toast shows "Verbinding timeout"

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### 3. HTTP Status Codes

**Test 3.1: 401 Unauthorized**
- [ ] Simuleer 401 in API route: `return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })`
- [ ] Toast shows: "Niet geautoriseerd - Je sessie is verlopen. Log opnieuw in."
- [ ] `retryable: false` (geen retry button)

**Test 3.2: 404 Not Found**
- [ ] Probeer non-existent patient ID: `/api/fhir/Patient/99999999`
- [ ] Toast shows: "Niet gevonden - Patiënt data ophalen niet gevonden."

**Test 3.3: 400 Bad Request**
- [ ] Submit dagnotitie zonder required fields
- [ ] Toast shows: "Ongeldige aanvraag - [validation message]"

**Test 3.4: 500 Internal Server Error**
- [ ] Simuleer server error in API route: `throw new Error('DB error')`
- [ ] Toast shows: "Serverfout - Er ging iets mis op de server. Probeer het later opnieuw."
- [ ] `retryable: true`

**Test 3.5: 429 Too Many Requests**
- [ ] (Moeilijk te simuleren zonder rate limiter)
- [ ] Toast should show: "Te veel aanvragen - Wacht even en probeer het later opnieuw."

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### 4. Validation Errors

**Test 4.1: Empty Fields in DagnotatieBlock**
- [ ] Open dagnotitie block
- [ ] Klik "Opslaan" zonder patiënt
- [ ] Toast shows: "Validatiefout - Selecteer een patiënt"
- [ ] Klik "Opslaan" zonder categorie
- [ ] Toast shows: "Validatiefout - Selecteer een categorie"
- [ ] Klik "Opslaan" zonder tekst
- [ ] Toast shows: "Validatiefout - Voer een notitie in"

**Test 4.2: Search Query Too Short**
- [ ] Type "j" in ZoekenBlock (< 2 characters)
- [ ] Geen API call (debounced + min length check)

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### 5. Intent Classification Errors

**Test 5.1: API Error**
- [ ] Typ commando in command input
- [ ] Simuleer API error in `/api/intent/classify`
- [ ] Toast shows error message
- [ ] FallbackPicker opent automatisch met original input
- [ ] Input is niet verloren (preserved in FallbackPicker)

**Test 5.2: Low Confidence**
- [ ] Typ gibberish: "asdfasdf jkljkl"
- [ ] Confidence < 0.5
- [ ] FallbackPicker opent met original input
- [ ] Can select fallback action (dagnotitie, zoeken, overdracht)

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### 6. Retry Logic

**Test 6.1: Retry Success on 2nd Attempt**
- [ ] Simuleer intermittent error (fails first, succeeds second)
- [ ] DagnotatieBlock save with `retryFetch()`
- [ ] Should retry automatically (max 3 attempts)
- [ ] Success toast after retry succeeds

**Test 6.2: Retry Exhausted (3 failures)**
- [ ] Simuleer consistent error (always fails)
- [ ] After 3 retries: Final error toast shown
- [ ] No infinite retry loop

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### 7. User-Friendly Messages (Dutch)

**Test 7.1: All Error Messages in Dutch**
- [ ] Check all toast messages are in Dutch
- [ ] Check all error titles are in Dutch
- [ ] No English fallback messages visible to user

**Test 7.2: Error Message Quality**
- [ ] Messages are actionable ("Controleer je internetverbinding")
- [ ] Not technical jargon ("fetch failed" → "Verbinding verbroken")
- [ ] Clear next steps when applicable

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### 8. Edge Cases

**Test 8.1: HTML Error Response (Auth Redirect)**
- [ ] Simulate HTML response (login page redirect)
- [ ] `parseErrorResponse()` detects HTML
- [ ] Toast shows: "Niet geautoriseerd. Log opnieuw in."

**Test 8.2: Malformed JSON Response**
- [ ] Simulate invalid JSON from API
- [ ] Error handled gracefully (no crash)
- [ ] User-friendly error shown

**Test 8.3: Error During Voice Input**
- [ ] Start voice recording
- [ ] Trigger error (offline, etc.)
- [ ] Voice recording stops gracefully
- [ ] Error shown to user

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## ✅ Implementation Checklist

- [x] `lib/swift/error-handler.ts` created with all utilities
- [x] `components/swift/command-center/offline-banner.tsx` created
- [x] OfflineBanner integrated in CommandCenter
- [x] CommandInput uses safeFetch + getErrorInfo
- [x] ContextBar uses useOffline hook (margin adjustment)
- [x] DagnotatieBlock uses safeFetch + getErrorInfo + retryFetch
- [x] ZoekenBlock uses safeFetch + getErrorInfo
- [x] OverdrachtBlock uses safeFetch + getErrorInfo + retryFetch
- [x] All error messages in Dutch
- [x] FallbackPicker handles unknown intents gracefully
- [x] TypeScript compiles without errors

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## 📋 Manual Testing Checklist (Quick Smoke Test)

Voor snelle verificatie:

1. **Offline Mode:**
   - [ ] DevTools → Offline → Banner appears → Try action → Error toast

2. **Network Error:**
   - [ ] Stop server → Try action → Error toast with retry

3. **Validation Error:**
   - [ ] Submit empty dagnotitie → Validation toast

4. **Intent Error:**
   - [ ] Type gibberish → FallbackPicker opens

5. **Success Path:**
   - [ ] Online → Submit dagnotitie → Success toast → Block closes

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## 🎯 Acceptatie Criteria E5.S2

- [x] Network errors tonen user-friendly messages (Dutch)
- [x] Offline detection met visual indicator (banner)
- [x] Validation errors zijn duidelijk en actionable
- [x] Retry functionaliteit werkt voor transient errors
- [x] HTTP status codes mapped naar begrijpelijke messages
- [x] FallbackPicker shown on intent classification failure
- [x] No lost user input on errors (preserved in FallbackPicker)
- [x] All error scenarios from test-plan-epic3.md covered

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## 🚀 Status

**E5.S2 - Error Handling: COMPLETE ✅**

All error handling utilities implemented, integrated across all components, and ready for testing.
