# Task ID: 2 - Bangla Escrow API Routes

## Agent: Backend API Developer

## Summary
Created all 13 API route files for the Bangla Escrow Website backend, covering user management, transactions, payments, disputes, notifications, and admin operations.

## Files Created

### Utility
- `/src/lib/auth-helper.ts` - Authentication helper functions (getAuthSession, requireAuth, requireAdmin)

### User Management (2 files)
- `/src/app/api/users/route.ts` - POST (register), GET (current profile)
- `/src/app/api/users/[id]/route.ts` - PUT (update profile)

### Transactions (2 files)
- `/src/app/api/transactions/route.ts` - GET (list with pagination), POST (create)
- `/src/app/api/transactions/[id]/route.ts` - GET (details), PUT (status workflow)

### Payments (2 files)
- `/src/app/api/payments/route.ts` - GET (list), POST (submit payment)
- `/src/app/api/payments/[id]/route.ts` - PUT (admin verify/reject)

### Disputes (2 files)
- `/src/app/api/disputes/route.ts` - GET (list), POST (open dispute)
- `/src/app/api/disputes/[id]/route.ts` - GET (with messages), POST (add message), PUT (admin resolve)

### Notifications (1 file)
- `/src/app/api/notifications/route.ts` - GET (list with unread count), PUT (mark as read)

### Admin (3 files)
- `/src/app/api/admin/route.ts` - GET (dashboard statistics)
- `/src/app/api/admin/users/route.ts` - GET (list users), PUT (toggle active status)
- `/src/app/api/admin/logs/route.ts` - GET (activity logs)

## Key Implementation Details

### Authentication & Authorization
- Uses `getServerSession(authOptions)` from next-auth for session checking
- `requireAuth()` returns null if not authenticated
- `requireAdmin()` returns null if not admin role
- Users can only access/modify their own resources

### Transaction Status Workflow
`pending_payment` → `pending_verification` → `paid` → `work_in_progress` → `delivered` → `completed`
- Can cancel from `pending_payment`
- Disputes can be opened from `paid`, `pending_verification`, `work_in_progress`, `delivered`

### Notification System
- Notifications created for: payment submitted, approved, rejected, status changes, dispute opened, dispute resolved
- Supports pagination and unread count
- Can mark individual or all notifications as read

### Admin Features
- Dashboard stats with user, transaction, payment, and dispute counts
- User management with search, pagination, and active/inactive toggle
- Activity logging for all admin actions (payment verification, dispute resolution, user management)
- Admin self-protection (cannot deactivate own account)

### Error Handling
- All endpoints wrapped in try/catch
- Proper HTTP status codes (400, 401, 403, 404, 409, 500)
- Bengali error messages throughout

### Validation
- Email uniqueness check on registration
- Buyer !== seller validation on transaction creation
- Both buyer and seller must exist and seller must be active
- Only one pending payment per transaction
- Only one active dispute per transaction
- Payment method validation (bKash, Nagad, Rocket, Bank Transfer)

## Testing Results
- Lint: ✅ Passes cleanly
- Dev server: ✅ Running without errors
- API endpoint tests:
  - POST /api/users (register): ✅ 201 Created
  - GET /api/users (unauthenticated): ✅ 401
  - GET /api/admin (unauthenticated): ✅ 403
  - GET /api/notifications (unauthenticated): ✅ 401