
# Medication Management Implementation Summary

## What Was Asked
Implement medication management handlers for the Normogen backend with the following endpoints:
- POST /api/medications - Create medication
- GET /api/medications - List medications
- GET /api/medications/:id - Get single medication
- POST /api/medications/:id - Update medication
- POST /api/medications/:id/delete - Delete medication
- POST /api/medications/:id/log - Log medication dose
- GET /api/medications/:id/adherence - Get adherence stats

## Actions Taken

### 1. Updated backend/src/models/medication.rs
Implemented a complete medication data model including:
- `Medication` struct with encrypted data support
- `MedicationReminder` struct for reminders
- `MedicationDose` struct for tracking doses
- `MedicationRepository` with full CRUD operations:
  - create(), find_by_id(), find_by_user(), find_by_user_and_profile()
  - update(), delete()
  - log_dose(), get_doses(), calculate_adherence()
- `AdherenceStats` struct for reporting

### 2. Updated backend/src/db/mongodb_impl.rs
Added medication support to the MongoDB implementation:
- Added `medications` and `medication_doses` collections
- Implemented 8 new methods:
  - create_medication(), get_medication(), list_medications()
  - update_medication(), delete_medication()
  - log_medication_dose(), get_medication_adherence()

### 3. Created backend/src/handlers/medications.rs
Implemented all 7 handler functions:
- `create_medication` - Creates new medication with audit logging
- `list_medications` - Lists user's medications (filtered by profile_id optionally)
- `get_medication` - Gets single medication with ownership verification
- `update_medication` - Updates medication with audit logging
- `delete_medication` - Deletes medication with audit logging
- `log_dose` - Logs medication dose (taken/skipped)
- `get_adherence` - Returns adherence stats for last 30 days

Each handler includes:
- JWT authentication integration
- User ownership verification (users can only access their own data)
- Input validation using the validator crate
- Proper error handling with appropriate HTTP status codes
- Audit logging for all mutations (create, update, delete)

### 4. Updated backend/src/handlers/mod.rs
Added medications module and re-exported all 7 handler functions

### 5. Updated backend/src/main.rs
Added 7 new routes:
- POST /api/medications
- GET /api/medications
- GET /api/medications/:id
- POST /api/medications/:id
- POST /api/medications/:id/delete
- POST /api/medications/:id/log
- GET /api/medications/:id/adherence

### 6. Created backend/tests/medication_tests.rs
Added basic integration tests verifying authentication is required for all endpoints

## Key Implementation Details

### Security Features
- All endpoints require JWT authentication
- Ownership verification on all operations (users can only access their own medications)
- Audit logging for all mutations (create, update, delete)
- Input validation on all request types

### Data Encryption
- Medication details stored in `EncryptedField` following the health_data pattern
- Support for encryption service integration (placeholder for production)

### Multi-Person Support
- `profile_id` field allows multiple people per account
- `list_medications` supports optional profile_id filtering
- All operations scoped to specific profiles

### Adherence Tracking
- Dose logging with taken/skipped status
- Scheduled time tracking
- Optional notes
- 30-day rolling adherence calculation

## Results
- ✅ Code compiles successfully (cargo check passed)
- ✅ All handlers follow existing code patterns
- ✅ No breaking changes to existing functionality
- ✅ Basic tests added for authentication verification

## Compilation Status
```
Checking normogen-backend v0.1.0 (/home/asoliver/desarrollo/normogen/backend)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in XX.XXs
```

## Notes
- The implementation follows the existing repository pattern used in users.rs and share.rs
- DateTime arithmetic was fixed to use `timestamp_millis()` instead of direct subtraction
- All handlers use POST for mutations as per project convention (updates and deletions)
- The medication doses are tracked in a separate collection for efficient querying
- Adherence is calculated as a rolling 30-day window

## Recommendations
1. Run the server and test endpoints manually with a JWT token
2. Add more comprehensive integration tests with database fixtures
3. Implement actual encryption for medication data (currently using placeholder)
4. Add rate limiting specifically for dose logging to prevent abuse
5. Consider adding reminder scheduling logic in a future phase
6. Add pagination support for list_medications if users have many medications
