# NUPST Project Hints

## Recent Refactoring (January 2026)

### Phase 1 - Quick Wins

1. **Prompt Utility (`ts/helpers/prompt.ts`)**
   - Extracted readline/prompt pattern from all CLI handlers
   - Provides `createPrompt()` and `withPrompt()` helper functions
   - Used in: `ups-handler.ts`, `group-handler.ts`, `service-handler.ts`, `action-handler.ts`, `feature-handler.ts`

2. **Constants File (`ts/constants.ts`)**
   - Centralized all magic numbers (timeouts, intervals, thresholds)
   - Contains: `TIMING`, `SNMP`, `THRESHOLDS`, `WEBHOOK`, `SCRIPT`, `SHUTDOWN`, `HTTP_SERVER`, `UI`
   - Used in: `daemon.ts`, `snmp/manager.ts`, `actions/*.ts`

3. **Logger Consistency**
   - Replaced all `console.log/console.error` in `snmp/manager.ts` with proper `logger.*` calls
   - Debug output uses `logger.dim()` for less intrusive output

### Phase 2 - Type Safety

4. **Circular Dependency Fix (`ts/interfaces/nupst-accessor.ts`)**
   - Created `INupstAccessor` interface to break the circular dependency between `Nupst` and `NupstSnmp`
   - `NupstSnmp.nupst` property now uses the interface instead of `any`

5. **Webhook Payload Interface (`ts/actions/webhook-action.ts`)**
   - Added `IWebhookPayload` interface for webhook action payloads
   - Exported from `ts/actions/index.ts`

6. **CLI Handler Type Safety**
   - Replaced `any` types in `ups-handler.ts` and `group-handler.ts` with proper interfaces
   - Uses: `IUpsConfig`, `INupstConfig`, `ISnmpConfig`, `IActionConfig`, `IThresholds`, `ISnmpUpsStatus`

## Architecture Notes

- **SNMP Manager**: Uses `INupstAccessor` interface (not direct `Nupst` reference) to avoid circular imports
- **CLI Handlers**: All use the `helpers.withPrompt()` utility for interactive input
- **Constants**: All timing values should be referenced from `ts/constants.ts`
- **Actions**: Use `IActionConfig` from `ts/actions/base-action.ts` for action configuration

## File Organization

```
ts/
├── constants.ts          # All timing/threshold constants
├── interfaces/
│   └── nupst-accessor.ts # Interface to break circular deps
├── helpers/
│   ├── prompt.ts         # Readline utility
│   └── shortid.ts        # ID generation
├── actions/
│   ├── base-action.ts    # Base action class and interfaces
│   ├── webhook-action.ts # Includes IWebhookPayload
│   └── ...
└── cli/
    └── ...               # All handlers use helpers.withPrompt()
```