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-# back
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+# 🚂 Track&Train Backend
+
+> **A modern, modular, and testable backend for fitness & coaching platforms, built with Python, FastAPI, and a full Hexagonal Architecture.**
+
+---
+
+## 🏗️ Project Architecture
+
+![Project Architecture Diagram](./image.png)
+
+- **Entrypoints**: FastAPI routers, schemas, and dependencies
+- **Domain**: Pure business logic, models, and service orchestration
+- **Adapters**: Infrastructure for SQL (Postgres/SQLAlchemy) and in-memory (for tests)
+- **Tests**: Full test coverage for all features using in-memory adapters
+
+---
+
+## ✨ Features
+
+- 🧑‍💼 **User & Coach Management**: Register, login, promote users to coaches, manage roles
+- 🏋️ **Group Management**: Create, update, delete, join/leave groups, add/remove members
+- 🏆 **Training & Exercise**: CRUD for trainings and exercises
+- 🍽️ **Diet**: CRUD for diets
+- 🔐 **JWT Auth**: Secure endpoints with role-based access
+- 🧩 **Hexagonal Architecture**: Clean separation of concerns, easy to test and extend
+- 🧪 **Comprehensive Tests**: All business logic tested with in-memory adapters
+- 🚀 **Hot Reload**: Fast development with Docker volume binding
+
+---
+
+## ⚙️ Installation & Usage
+
+### 1️⃣ Local Development
+
+```bash
+# 1. Copy environment variables
+cp .env.example .env
+# 2. Edit .env to set your secrets and DB connection
+
+# 3. Create and activate a virtual environment
+uv sync
+source .venv/bin/activate
+
+# 4. Start the API (with hot reload)
+uvicorn src.main:app --reload --host 127.0.0.1 --port 8000
+```
+
+- The API will be available at [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs)
+
+### 2️⃣ Docker Compose (API + Postgres)
+
+```bash
+# 1. Copy environment variables
+cp .env.example .env
+# 2. Edit .env as needed
+
+# 3. Start everything (API + DB + hot reload)
+docker compose up -d
+```
+
+- The backend is mounted with a volume on `src/` for instant code reload
+- Database and backend are both started and networked automatically
+
+---
+
+## 🧪 Running Tests
+
+- All tests are designed to run sequentially (not isolated per test)
+- You can run all API tests in order with:
+
+```bash
+pytest src/entrypoints/api/tests/profile.py src/entrypoints/api/tests/group.py src/entrypoints/api/tests/exercise.py src/entrypoints/api/tests/training.py src/entrypoints/api/tests/diet.py
+```
+
+- You can also run a single test file if needed, but tests are designed to be run in sequence for full state setup.
+
+---
+
+## 📂 Main Project Structure
+
+```
+back/
+├── src/
+│   ├── __init__.py
+│   ├── main.py                # FastAPI app entrypoint
+│   ├── container.py           # Dependency injection container
+│   ├── domain/
+│   │   ├── model/             # Domain models (Profile, Group, etc.)
+│   │   ├── services/          # Business logic (service layer)
+│   │   ├── ports/             # Interfaces (repositories, etc.)
+│   │   ├── exceptions.py      # Domain exceptions
+│   ├── adapters/
+│   │   ├── sqlalchemy/        # SQLAlchemy (Postgres) implementation
+│   │   ├── inmemory/          # In-memory implementation for tests
+│   ├── entrypoints/
+│   │   ├── api/               # FastAPI routers, schemas, dependencies
+│   │   └── tests/             # Pytest test files
+│   └── ...
+├── Dockerfile
+├── docker-compose.yml
+├── pyproject.toml
+├── .env.example
+└── README.md
+```
+
+---
+
+## 📝 Example API Endpoints
+
+- `POST   /profiles`           → Register user
+- `POST   /profiles/login`     → Login
+- `PATCH  /profiles/{id}/roles`→ Promote user to coach
+- `POST   /groups`             → Create group (coach/admin)
+- `GET    /groups`             → List all groups
+- `GET    /groups/coachs/mine` → List all coaches for current user
+- `POST   /groups/{group_id}/members/{user_id}` → Add member
+- `DELETE /groups/{group_id}/leave` → Leave group
+- ...and many more!
+
+---
+
+## 💡 Why Hexagonal Architecture?
+
+- **Testability**: Swap adapters (SQL/in-memory) for real DB or fast tests
+- **Maintainability**: Business logic is pure and isolated
+- **Extensibility**: Add new adapters (e.g., REST, gRPC, CLI) without touching domain
+- **Separation of Concerns**: Each layer has a single responsibility
+
+---
+
+## 🛠️ Contributing
+
+- Fork, branch, and submit PRs!
+- All new features should include tests
+- Please update the changelog for any user-facing changes
+
+---
+
+## 🧑‍💻 Authors & License
+
+- Made with ❤️ by the Track&Train team
+- MIT License
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