name: Backend CI

on:
  push:
    branches: [ "main" ]
    paths:
      - 'backend/**'
  pull_request:
    branches: [ "main" ]
    paths:
      - 'backend/**'

jobs:
  lint-and-check:
    runs-on: ubuntu-latest
    defaults:
      run:
        working-directory: ./backend

    steps:
    - uses: actions/checkout@v4
    
    - name: Set up Python 3.10
      uses: actions/setup-python@v5
      with:
        python-version: "3.10"
        cache: 'pip'
        
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install flake8 black
        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
        
    - name: Check code formatting with Black
      run: |
        black --check .
        
    - name: Lint with flake8
      run: |
        # stop the build if there are Python syntax errors or undefined names
        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
        # exit-zero treats all errors as warnings.
        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics