# CLAUDE.md - Project Intelligence

## Project Overview

**Org-Parking** is a manager-centric parking spot management system for organizations. It features fair parking assignment based on presence/parking ratio, supporting both standalone JWT authentication and Authelia/LLDAP SSO integration.

### Technology Stack
- **Backend:** FastAPI + SQLAlchemy + SQLite
- **Frontend:** Vanilla JavaScript (no frameworks)
- **Auth:** JWT tokens + Authelia SSO support
- **Containerization:** Docker + Docker Compose

### Architecture
```
app/routes/     → API endpoints (auth, users, managers, presence, parking)
services/       → Business logic (parking algorithm, auth, notifications)
database/       → SQLAlchemy models and connection
frontend/       → Static HTML pages + JS modules
utils/          → Auth middleware
```

## Build & Run Commands

```bash
# Development
python -m uvicorn main:app --reload --host 0.0.0.0 --port 8000

# Docker
docker compose up -d

# Dependencies
pip install -r requirements.txt

# Initialize test database
python create_test_db.py
```

## Code Style & Conventions

### Python
- FastAPI async patterns with `Depends()` for dependency injection
- Pydantic models for request/response validation
- SQLAlchemy ORM (no raw SQL)
- UUIDs as string primary keys: `str(uuid.uuid4())`
- Dates stored as TEXT in "YYYY-MM-DD" format

### JavaScript
- ES6 modules with centralized API client (`/js/api.js`)
- Token stored in localStorage, auto-included in requests
- Utility functions in `/js/utils.js`
- Role-based navigation in `/js/nav.js`

### Authentication
- Dual mode: JWT tokens (standalone) or Authelia headers (SSO)
- LDAP users have `password_hash = None`
- Check pattern: `config.AUTHELIA_ENABLED and user.password_hash is None`

---

## Known Issues & Technical Debt

### Critical

1. **Inactive Notification System**
   - Location: [services/notifications.py](services/notifications.py)
   - Issue: All code implemented but no scheduler integrated
   - TODO: Integrate APScheduler or similar

2. **Default SECRET_KEY**
   - Location: [app/config.py:13](app/config.py#L13)
   - Issue: Defaults to "change-me-in-production"
   - Fix: Add startup validation to error if default key used

3. **No CSRF Protection**
   - Forms use token auth only, vulnerable to CSRF attacks
   - Fix: Implement CSRF tokens or validate referer header

4. **No Rate Limiting**
   - Login endpoint has no brute force protection
   - Fix: Add slowapi or similar middleware

### Performance

1. **N+1 Query Problems**
   - Location: [app/routes/managers.py:244-259](app/routes/managers.py#L244-L259)
   - Location: [app/routes/presence.py:336-419](app/routes/presence.py#L336-L419)
   - Issue: Loops that query database for each item
   - Fix: Use joins and relationship loading

2. **Inefficient Spot Prefix Lookups**
   - Location: [services/parking.py:56-64](services/parking.py#L56-L64)
   - Issue: Repeated DB queries for same data
   - Fix: Cache in request context

### Code Quality

1. **Duplicated LDAP Check Logic** (4+ locations)
   ```python
   # Appears in: users.py:91, 168, 257, 280
   is_ldap_user = config.AUTHELIA_ENABLED and user.password_hash is None
   ```
   - Fix: Create `utils.is_ldap_user(user)` helper

2. **Inline JavaScript in HTML**
   - 500+ lines embedded across pages
   - Affected: team-rules.html, team-calendar.html, settings.html
   - Fix: Extract to separate JS files

3. **Inconsistent Response Formats**
   - Some endpoints return dicts, others Pydantic models
   - Fix: Standardize on Pydantic response schemas

4. **God Object: User Model**
   - Location: [database/models.py:11-47](database/models.py#L11-L47)
   - Issue: 27 columns mixing auth, profile, preferences, manager settings
   - Fix: Normalize into UserProfile, UserPreferences, ManagerSettings tables

5. **Repetitive CRUD in managers.py**
   - Location: [app/routes/managers.py](app/routes/managers.py)
   - Issue: 4 resources × 3 operations with near-identical code
   - Fix: Create generic CRUD factory or base class

6. **Silent Exception Handling**
   - Location: [app/routes/presence.py:135-143](app/routes/presence.py#L135-L143)
   - Issue: Catches all exceptions and only prints
   - Fix: Log properly and propagate meaningful errors

---

## Areas for Simplification

### 1. Consolidate Response Building
The `user_to_response()` pattern is duplicated in [users.py:76-107](app/routes/users.py#L76-L107) and [users.py:254-274](app/routes/users.py#L254-L274). Create single reusable function.

### 2. Generic CRUD Router Factory
[managers.py](app/routes/managers.py) has 12 nearly identical endpoints. Create:
```python
def create_crud_router(model: Type, schema: Type, parent_key: str):
    router = APIRouter()
    # Generate GET, POST, DELETE endpoints
    return router
```

### 3. Frontend State Management
Each page maintains its own globals (`currentUser`, `currentData`). Consider simple app-level state or Web Components.

### 4. Date Handling
All dates stored as TEXT strings. Could use proper DATE columns for better query performance and validation.

### 5. Notification Service Activation
Create [services/scheduler.py](services/scheduler.py) with APScheduler:
```python
from apscheduler.schedulers.asyncio import AsyncIOScheduler

scheduler = AsyncIOScheduler()
scheduler.add_job(process_notification_queue, 'interval', minutes=5)
```

---

## Security Improvements Needed

| Priority | Issue | Location | Recommendation |
|----------|-------|----------|----------------|
| HIGH | Rate limiting | main.py | Add slowapi middleware |
| HIGH | CSRF protection | All forms | Implement CSRF tokens |
| HIGH | Secret validation | config.py:13 | Error on default key |
| MEDIUM | Password validation | auth.py:63-67 | Enforce complexity rules |
| MEDIUM | Input sanitization | notification emails | Use template library |
| LOW | CORS configuration | compose.yml | Document production settings |

---

## Testing Strategy (Missing)

No tests currently exist. Recommended structure:
```
tests/
├── conftest.py          # Fixtures (test DB, client, auth)
├── test_auth.py         # JWT and Authelia modes
├── test_parking.py      # Fair assignment algorithm
├── test_presence.py     # Bulk operations, team calendar
├── test_managers.py     # CRUD operations
└── integration/
    └── test_workflows.py # End-to-end scenarios
```

Key test scenarios:
1. Parking algorithm with varying ratios
2. Manager closing days affect assignments
3. Guarantee and exclusion rules
4. Authelia header authentication flow
5. LDAP vs local user password handling

---

## API Quick Reference

### Authentication
- `POST /api/auth/register` - Create user (standalone mode)
- `POST /api/auth/login` - Get JWT token
- `GET /api/auth/me` - Current user (JWT or Authelia)

### Presence
- `POST /api/presence/mark` - Mark single day
- `POST /api/presence/mark-bulk` - Mark multiple days
- `GET /api/presence/team` - Team calendar with parking

### Parking
- `POST /api/parking/manual-assign` - Manager assigns spot
- `POST /api/parking/reassign-spot` - Reassign existing spot
- `GET /api/parking/eligible-users/{id}` - Users for reassignment

### Manager Settings
- `GET/POST/DELETE /api/managers/closing-days`
- `GET/POST/DELETE /api/managers/weekly-closing-days`
- `GET/POST/DELETE /api/managers/guarantees`
- `GET/POST/DELETE /api/managers/exclusions`

---

## Development Notes

### Adding a New Route
1. Create file in `app/routes/`
2. Use `APIRouter(prefix="/api/...", tags=["..."])`
3. Register in `main.py`: `app.include_router(...)`
4. Add auth dependency: `current_user: User = Depends(get_current_user)`

### Database Migrations
No migration system (Alembic) configured. Schema changes require:
1. Update [database/models.py](database/models.py)
2. Delete SQLite file or write manual migration
3. Run `create_test_db.py` for fresh database

### Frontend Page Pattern
```html
<script type="module">
import api from '/js/api.js';
import { initNav } from '/js/nav.js';

document.addEventListener('DOMContentLoaded', async () => {
    await api.checkAuth(true);  // Redirect to login if not auth'd
    initNav();
    // Page-specific logic
});
</script>
```

---

## File Quick Links

| Purpose | File |
|---------|------|
| Main entry | [main.py](main.py) |
| Configuration | [app/config.py](app/config.py) |
| Database models | [database/models.py](database/models.py) |
| Parking algorithm | [services/parking.py](services/parking.py) |
| Auth middleware | [utils/auth_middleware.py](utils/auth_middleware.py) |
| Frontend API client | [frontend/js/api.js](frontend/js/api.js) |
| CSS styles | [frontend/css/styles.css](frontend/css/styles.css) |
| Docker config | [compose.yml](compose.yml) |