compare_functional_go_vs_dart/README.md

# ⏰ ActaTempus: Time Tracking and Management System

## 🌟 Overview

**ActaTempus** is a system for work hour management and tracking, showcasing differences and similarities in functional programming using two backend implementations: **Go** and **Dart**.  

The current focus is backend development, while frontend development has been separated for future hobbyist work. Interaction with the system is facilitated through **Insomnia**, with an Insomnia collection provided in `docs/insomnia`.

---

## 🚀 Features

✅ **User Management**: Registration, login, profile updates  
✅ **Time Tracking**: Start/stop tracking, manual entries, and break management  
✅ **Project Management**: Create and manage projects, tasks, and time entries  
✅ **Task Management**: Manage tasks related to projects

---

## 🏗️ Architecture

ActaTempus adheres to **Domain-Driven Design (DDD)** and **Clean Architecture** principles. The system is divided into **four primary layers**:

![Architecture Diagram](docs/media/architecture.png)

1️⃣ **Domain Layer**:  
   - Contracts, definitions, and core logic.  

2️⃣ **Infrastructure Layer**:  
   - Database integrations and external service interfaces (e.g., Prisma with PostgreSQL).  

3️⃣ **Application Layer**:  
   - Business logic, services, and response handling.  

4️⃣ **Interface Layer**:  
   - REST APIs for external communication.

---

## 📑 Specification

The detailed system specification is available in the documentation. Refer to the specification document for an in-depth understanding of the system design, architecture, and implementation details.

[📄 View the Specification](docs/KP_Spec-4.pdf)
---

## 🛠️ Technology Stack

### ⚙️ Backend

#### Go:
- **Gin**: HTTP web framework for building REST APIs.
- **GORM**: PostgreSQL ORM for database interactions.
- **Prisma-Go**: Schema management and database adapter.
- **JWT (golang-jwt)**: Authentication and token generation.
- **fp-go**: Functional programming library for Go.
- **Viper**: Configuration management.
- **UUID**: Library for unique identifier generation.
- **Decimal (shopspring/decimal)**: High-precision decimal arithmetic.

#### Dart:
- **ORM (Drift/Aqueduct)**: Object-relational mapping for database integration.
- **PostgreSQL**: Database connectivity and query execution.
- **Shelf**: HTTP server framework.
- **Shelf Router**: Routing for Shelf applications.
- **JWT (dart_jsonwebtoken)**: Authentication and token generation.
- **fpdart**: Functional programming library for Dart.
- **Riverpod**: State management for the application.
- **Freezed**: Immutable data classes and sealed classes.
- **UUID**: Unique identifier generation.
- **Crypto**: Cryptographic utilities.

### 📦 Database
- **PostgreSQL**: Primary database for structured data storage.
- **Prisma ORM**: Shared schema across Go and Dart implementations, providing unified database management. 

---

## 📁 Directory Structure

```
backend-go/         # Go backend implementation
backend-dart/       # Dart backend implementation
docs/               # Documentation, including Insomnia collections
```

---

## 📖 Getting Started

### Prerequisites
For a seamless development experience, use the provided **devcontainer** setup.
Ensure you have the following installed:  
- [Docker](https://www.docker.com/)  
- [VisualStudioCode](https://code.visualstudio.com/) 

If you dont want to use devcontainers and/or docker you need to install the following dependencies on your own:
- Go  
- Dart  
- PostgreSQL  
- NodeJS (required for Prisma)


### 🔧 Installation

1. **Clone the repository**:
   ```bash
   git clone https://inf-git.th-rosenheim.de/studavrije7683/ws24-kp-avril.git
   cd ws24-kp-avril
   ```

2. **Use the devcontainer**:  
   Launch it with Visual Studio Code:
   ```bash
   code .
   ```

---

## 🖥️ Running ActaTempus

### Backend (Go)

```bash
cd backend-go
go run cmd/actatempus/main.go # Starts on port 8080
```

### Backend (Dart)

```bash
cd backend-dart
dart run bin/backend_dart.dart # Starts on port 8080
```

---

### 🗄️ Database Management

ActaTempus uses **Prisma ORM** for schema management and code generation across both backends.  
Start the PostgreSQL server using the provided `docker-compose.yml`:

```bash
docker compose up
```

#### Deploy the Schema
Apply the schema using Prisma. Only one backend needs to execute the command, as both backends share the schema:

```bash
cd backend-go
go run github.com/steebchen/prisma-client-go db push
```

or  

```bash
cd backend-dart
bunx prisma db push
```

#### Prisma Studio
Launch Prisma Studio for database visualization and management:

```bash
cd backend-dart
bunx prisma studio
```

### Code Generation
Regenerate ORM code after modifying the `schema.prisma` file:

##### Dart
```bash
cd backend-dart
bunx prisma generate
```

##### Go
```bash
cd backend-go
go run github.com/steebchen/prisma-client-go generate
```

---

## ⚠️ Testing

##### Dart
```bash
cd backend-dart
dart test
```

##### Go
```bash
cd backend-go
go test ./... -v
```

---
## 📖 Interaction with the System

Use **[Insomnia](https://insomnia.rest/)** for interacting with the APIs.  
The Insomnia collection is provided under `docs/insomnia`. Import it to get started quickly with predefined requests.
![Insomnia Demo](docs/media/insomnia2.gif)

---

## 🛣️ Roadmap

### Phase 1: **Initialize**
- ✅ Define specifications  
- ✅ Set up repository  

### Phase 2: **Setup**
- ✅ Frontend (Next.js, Deno)  
- ✅ Backends (Dart & Go)  
- ✅ Devcontainer  

### Phase 3: **MVP Development**
- Build foundational backends in Go & Dart
- Implement:  
  - ✅ Domain layer (Entities, Repositories)  
  - ✅ Application logic (Services, DTOs, JWT Authentication)  
  - ✅ Basic authorization  

### Phase 4: **Web UI**
- 🎨 Build frontend for:  
  - Timetracking  
  - Project management  
  - Reporting  

---

## 🌐 Resources

- [Functional Programming in Go](https://pkg.go.dev/github.com/IBM/fp-go)
- [Dart Documentation](https://dart.dev/)