name: CI

on:
  push:
  pull_request:

jobs:
  checks:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          python-version: "3.13"
      - name: Install system packages
        # The tests open a hidden Tk window, so the runner needs the Tk libraries
        # and a virtual display (xvfb). sudo is used only where the image has it.
        env:
          DEBIAN_FRONTEND: noninteractive
        run: |
          SUDO=$(command -v sudo || true)
          $SUDO apt-get update
          $SUDO apt-get install -y xvfb python3-tk
      - name: Install
        # The dev tools are a dependency group in pyproject.toml, not an extra,
        # so they need --group dev (pip 25.1 or newer).
        run: |
          python -m pip install --upgrade pip
          python -m pip install -e . --group dev
      - name: Tests
        run: xvfb-run -a python -m pytest
      - name: Lint
        run: python -m ruff check src tests
      - name: Format check
        run: python -m ruff format --check src tests
      - name: Types
        run: python -m mypy src tests