Firebase Cloud Functions Template

Create Firebase Cloud Functions for:

Project Type: {{PROJECT_TYPE}}
Functions Needed: {{FUNCTIONS}}
Runtime: {{RUNTIME}} (Node.js/Python)

Generate complete Firebase Functions setup:

1. **Project Structure:**
   - functions/src/index.ts
   - functions/src/triggers/
   - functions/src/callable/
   - functions/src/scheduled/
   - functions/src/utils/

2. **HTTP Functions:**
   - Express app integration
   - CORS handling
   - Request validation
   - Response formatting
   - Error handling

3. **Callable Functions:**
   - Function definition
   - Authentication context
   - Data validation
   - Error responses

4. **Firestore Triggers:**
   - onCreate
   - onUpdate
   - onDelete
   - onWrite
   - Document path patterns

5. **Auth Triggers:**
   - onCreate user
   - onDelete user
   - Custom claims

6. **Scheduled Functions:**
   - Pub/Sub schedule
   - Cron expressions
   - Time zone handling

7. **Storage Triggers:**
   - Object finalized
   - Object deleted
   - Image processing

8. **Configuration:**
   - Environment config
   - Secret management
   - Runtime options
   - Memory/timeout settings

9. **Deployment:**
   - firebase.json config
   - Deployment groups
   - Emulator setup
   - CI/CD integration

10. **Testing:**
    - Firebase test SDK
    - Emulator testing
    - Mock functions

Include proper error handling and logging.