# Cards Setup Guide

## What's Been Completed

Your Mana integration is now **100% complete** with a fully functional credit system! 🎉

### ✅ Backend (Complete)
- [x] ManaModule configured with environment variables
- [x] Service key configuration for credit operations
- [x] Credit operation types defined (deck creation = 10 mana)
- [x] Credit validation before deck creation
- [x] Credit consumption after successful operations
- [x] Credit balance endpoint (`GET /api/credits/balance`)
- [x] AuthGuard protecting all API routes
- [x] User profile endpoint with credit balance

### ✅ Frontend (Complete)
- [x] Authentication service with sign in/up/out
- [x] Token manager with automatic refresh
- [x] API client with auth token injection
- [x] Device manager for multi-device support
- [x] InsufficientCreditsModal component
- [x] useInsufficientCredits hook
- [x] Credit service for balance checking
- [x] Type definitions for credit errors
- [x] Example deck creation implementation

### ✅ Documentation (Complete)
- [x] README.md with quick start
- [x] CREDIT_SYSTEM.md with full documentation
- [x] Integration guides (4 files)
- [x] Working code example

## Next Steps to Go Live

### 1. Add Your Service Key (5 minutes) ⚠️ REQUIRED

The backend needs a service key from Mana to validate and consume credits.

**backend/.env**:
```env
SERVICE_KEY=your-actual-service-key-here
```

**Where to get it**: Contact Mana admin or check your Mana dashboard.

Without this key, credit operations will fail with authentication errors.

### 2. Test the Credit Flow (15 minutes)

#### A. Start the backend
```bash
cd backend
npm run start:dev
```

#### B. Test authentication
```bash
# Sign up a test user
curl -X POST http://localhost:8080/v1/auth/signup \
  -H "Content-Type: application/json" \
  -d '{"email":"test@cards.com","password":"test123","username":"testuser"}'

# Sign in to get token
curl -X POST http://localhost:8080/v1/auth/signin \
  -H "Content-Type: application/json" \
  -d '{"email":"test@cards.com","password":"test123"}'

# Copy the appToken from response
export TOKEN="paste-your-token-here"
```

#### C. Test credit balance
```bash
curl -H "Authorization: Bearer $TOKEN" \
  http://localhost:8080/api/credits/balance
```

Expected response:
```json
{
  "userId": "...",
  "balance": 100,
  "currency": "mana",
  "timestamp": "2025-..."
}
```

#### D. Test deck creation (costs 10 mana)
```bash
curl -X POST http://localhost:8080/api/decks \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"name":"Test Deck","description":"My first deck"}'
```

Expected success response:
```json
{
  "success": true,
  "userId": "...",
  "deck": {
    "id": "deck_...",
    "name": "Test Deck",
    "description": "My first deck",
    "userId": "...",
    "createdAt": "2025-..."
  },
  "creditsUsed": 10,
  "message": "Deck created successfully"
}
```

#### E. Check updated balance
```bash
curl -H "Authorization: Bearer $TOKEN" \
  http://localhost:8080/api/credits/balance
```

Should now show `90` instead of `100`.

#### F. Test insufficient credits error

Create decks until balance < 10, then try one more time:

```bash
curl -X POST http://localhost:8080/api/decks \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"name":"Another Deck"}'
```

Expected insufficient credits response (400):
```json
{
  "error": "insufficient_credits",
  "message": "Insufficient mana. Required: 10, Available: 5",
  "requiredCredits": 10,
  "availableCredits": 5,
  "operation": "Create a new deck"
}
```

### 3. Test Frontend Integration (15 minutes)

#### A. Start the mobile app
```bash
cd apps/mobile
npm start
```

Press `i` for iOS, `a` for Android, or `w` for web.

#### B. Test authentication
1. Sign up with a new account
2. Verify tokens are stored
3. Sign out and sign in again

#### C. Test credit display
1. Navigate to profile or deck creation screen
2. Verify credit balance is displayed
3. Create a deck and see balance update

#### D. Test insufficient credits modal
1. Create decks until balance < 10
2. Try creating another deck
3. Verify modal appears with:
   - Required: 10 mana
   - Available: [your balance]
   - Needed: [shortfall]

### 4. Integrate into Your Actual Screens (1-2 hours)

Copy the pattern from `apps/mobile/examples/DeckCreationExample.tsx` into your real deck creation screens.

#### Quick integration checklist:
- [ ] Import `useInsufficientCredits` hook
- [ ] Import `InsufficientCreditsModal` component
- [ ] Import `creditService`
- [ ] Load and display credit balance on screen
- [ ] Wrap API calls in try/catch
- [ ] Call `insufficientCredits.handleCreditError(error)` in catch
- [ ] Render `<InsufficientCreditsModal {...insufficientCredits} />`

### 5. Add Credit Purchase Flow (Optional)

If users can purchase credits:

1. Create a purchase screen in `apps/mobile/app/purchase-credits.tsx`
2. Implement payment integration (Stripe, in-app purchases, etc.)
3. Update `onPurchase` handler in InsufficientCreditsModal:
   ```typescript
   onPurchase={() => {
     insufficientCredits.hideInsufficientCredits();
     navigation.navigate('PurchaseCredits');
   }}
   ```

## Credit Costs Reference

These are defined in `backend/src/config/credit-operations.ts`:

| Operation | Cost | Location |
|-----------|------|----------|
| Deck Creation | 10 mana | `POST /api/decks` |
| Card Creation | 2 mana | `POST /api/cards` |
| AI Card Generation | 5 mana | `POST /api/cards/generate` |
| Deck Export | 3 mana | `POST /api/decks/:id/export` |

To change costs, edit the `CREDIT_COSTS` object in that file.

## Adding More Billable Operations

Example: Make card updates cost 1 mana:

### 1. Add to credit-operations.ts
```typescript
export enum CreditOperationType {
  // ... existing
  CARD_UPDATE = 'card_update',
}

export const CREDIT_COSTS = {
  // ... existing
  [CreditOperationType.CARD_UPDATE]: 1,
};
```

### 2. Update the endpoint
```typescript
@Put('cards/:id')
async updateCard(@CurrentUser() user: any, @Param('id') cardId: string, @Body() data: any) {
  const operationType = CreditOperationType.CARD_UPDATE;
  const cost = getCreditCost(operationType);

  // Validate credits
  const validation = await this.creditClient.validateCredits(user.id, operationType, cost);
  if (!validation.hasCredits) {
    throw new BadRequestException({
      error: 'insufficient_credits',
      requiredCredits: cost,
      availableCredits: validation.availableCredits,
    });
  }

  // Update card
  const updated = await this.updateCardInDatabase(cardId, data);

  // Consume credits
  await this.creditClient.consumeCredits(
    user.id,
    operationType,
    cost,
    `Updated card ${cardId}`,
    { cardId }
  );

  return { success: true, card: updated, creditsUsed: cost };
}
```

That's it! The frontend automatically handles the error.

## Production Checklist

Before deploying to production:

### Backend
- [ ] Set `NODE_ENV=production` in production environment
- [ ] Add real `SERVICE_KEY` from Mana
- [ ] Configure proper CORS for your frontend domain
- [ ] Set up proper logging/monitoring
- [ ] Add rate limiting
- [ ] Set up database backups

### Frontend
- [ ] Update `EXPO_PUBLIC_API_URL` to production backend URL
- [ ] Test on real devices (iOS + Android)
- [ ] Test insufficient credits flow
- [ ] Test token refresh
- [ ] Test offline behavior
- [ ] Build production bundle
- [ ] Submit to app stores

## Common Issues & Solutions

### "Service key not configured"
**Problem**: Credit operations fail.
**Solution**: Add `SERVICE_KEY` to `backend/.env`

### Credits not deducting
**Problem**: Balance doesn't change after operations.
**Solution**: Check that `consumeCredits()` is called AFTER operation succeeds.

### Modal not showing
**Problem**: Error occurs but modal doesn't appear.
**Solution**: Make sure:
1. `useInsufficientCredits` hook is used
2. `handleCreditError()` is called in catch block
3. `InsufficientCreditsModal` is rendered

### Android can't connect to backend
**Problem**: Frontend can't reach localhost:8080.
**Solution**: Use `http://10.0.2.2:8080` for Android emulator.

## Files You Can Customize

### Credit Costs
`backend/src/config/credit-operations.ts` - Change costs here

### Modal Appearance
`apps/mobile/components/InsufficientCreditsModal.tsx` - Customize UI

### Error Messages
`backend/src/controllers/api.controller.ts` - Customize error responses

### Purchase Flow
Add `onPurchase` handler to modal in your screens

## Need Help?

1. **Credit System**: See [CREDIT_SYSTEM.md](./CREDIT_SYSTEM.md)
2. **Integration**: See [MANA_CORE_INTEGRATION_GUIDE.md](./MANA_CORE_INTEGRATION_GUIDE.md)
3. **Architecture**: See [MANA_CORE_ARCHITECTURE.md](./MANA_CORE_ARCHITECTURE.md)
4. **Example Code**: See [apps/mobile/examples/DeckCreationExample.tsx](./apps/mobile/examples/DeckCreationExample.tsx)
5. **Mana**: https://github.com/Memo-2023/mana-core-nestjs-package

## Summary

You now have:
- ✅ Complete authentication system
- ✅ Credit validation before operations
- ✅ Credit consumption after success
- ✅ Insufficient credits modal
- ✅ Balance checking
- ✅ Full documentation
- ✅ Working example

**Next action**: Add your `SERVICE_KEY` to `backend/.env` and run the test flow above!