# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Build & Development Commands

```bash
flutter pub get              # Install dependencies
flutter analyze              # Run static analysis (run after every task)
dart format <paths>          # Format code
flutter test                 # Run tests
flutter run -d <device>      # Run app on device
dart run build_runner build  # Generate ObjectBox code after entity changes
```

**Versioning:** The Flutter app version is maintained in `pubspec.yaml` (`version:`); the settings view shows it at runtime via `package_info_plus`. The web app/backend version is maintained separately in `backend/pom.xml` (`<revision>`) and surfaced through the `app.version` property.

**Important:** Run `flutter analyze` after every task and fix any reported issues before committing.

## Architecture Overview

This is a Flutter app for job/task management with MQTT-based backend communication. The app is written in German for end users.

### Core Components

**AppState** (`lib/app_state.dart`)
- Singleton managing global state: `appUserId`, in-memory jobs list
- Handles persistence via DatabaseService with coalesced writes
- Emits `jobsUpdated` events via both StreamController and DartMQ

**DartMQ** (`lib/services/dart_mq.dart`)
- Lightweight in-app pub/sub message bus for decoupled communication
- Key topics defined in `MQTopics`: `connectionStatus`, `authResponse`, `jobsResponse`, `taskEvents`, `jobsUpdated`, `chatIncoming`, `chatOutgoing`
- UI and services subscribe/publish without direct dependencies

**MqttService** (`lib/services/mqtt_service.dart`, aliased as `StompService`)
- MQTT client connecting to Mosquitto broker at `mqtt-2.assecutor.de:42099`
- Handles authentication, job loading, chat messages, task completion
- Message envelope pattern with ACK/retry system for reliable delivery
- Offline message queuing via DatabaseService
- Publishes all server events through DartMQ topics

**DatabaseService** (`lib/services/database_service.dart`)
- ObjectBox-based local persistence
- Stores jobs, task status, user data, chat messages, queued MQTT messages
- Entities in `lib/entities/` require `dart run build_runner build` after changes

### Data Flow

1. `LoginView` initiates MQTT connection, sends credentials to `/server/login`
2. Server responds on `/client/{appId}/auth` → MqttService publishes `MQTopics.authResponse`
3. On success, `AppState` stores `appUserId`, `JobsView` requests jobs via `/server/{userId}/jobs/assigned`
4. Jobs arrive on `/client/{userId}/jobs` → published to `MQTopics.jobsResponse` → persisted → UI refresh via `MQTopics.jobsUpdated`
5. Task updates flow through `/client/{userId}/notifications` → `MQTopics.taskEvents`

### Models

- **Job** (`lib/models/job.dart`): Contains pickup/delivery addresses, cargo items, and tasks
- **Task** (`lib/models/task.dart`): Abstract base with subtypes: `ConfirmationTask`, `PhotoTask`, `TodoListTask`, `SignatureTask`, `BarcodeTask`, `CommentTask`, `GenericTask`
- **ChatMessage** (`lib/models/chat_message.dart`): Chat with direction, content type, job linking

### Views

- `LoginView` → `JobsView` → `CargoItemsView` → Task screens
- `ChatsView` → `ChatDetailsView`
- Task capture screens in `lib/tasks/`: photo, signature, barcode

## Key Patterns

- All services are singletons (factory constructors returning `_instance`)
- MQTT messages wrapped in `MessageEnvelope` for reliable delivery with ACK
- UI subscribes to DartMQ topics rather than holding service references
- Jobs are normalized before persistence to ensure consistent data
