name: Main

on:
  push:
    branches:
      - master
    tags:
      - '**'
  pull_request:
    branches:
      - '**'

jobs:
  tests:
    name: ${{ matrix.os }} / ${{ matrix.python-version }}
    runs-on: ${{ matrix.os }}-latest
    strategy:
      max-parallel: 4
      matrix:
        os: [Ubuntu, MacOS, Windows]
        python-version: [3.7, 3.8, 3.9, "3.10", "3.11"]

    defaults:
      run:
        shell: bash

    steps:
      - uses: actions/checkout@v3

      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v4
        with:
          python-version: ${{ matrix.python-version }}

      - name: Get full Python version
        id: full-python-version
        run: |
          echo ::set-output name=version::$(python -c "import sys; print('-'.join(str(v) for v in sys.version_info))")

      - name: Install poetry
        run: |
          curl -sL https://install.python-poetry.org | python - -y

      - name: Update PATH
        if: ${{ matrix.os != 'Windows' }}
        run: echo "$HOME/.local/bin" >> $GITHUB_PATH

      - name: Update PATH for Windows
        if: ${{ matrix.os == 'Windows' }}
        run: echo "$APPDATA\Python\Scripts" >> $GITHUB_PATH

      - name: Configure poetry
        run: |
          poetry config virtualenvs.in-project true

      - name: Set up cache
        uses: actions/cache@v3
        id: cache
        with:
          path: .venv
          key: venv-${{ runner.os }}-${{ steps.full-python-version.outputs.version }}-${{ hashFiles('**/poetry.lock') }}

      - name: Ensure cache is healthy
        if: steps.cache.outputs.cache-hit == 'true'
        run: |
          # `timeout` is not available on macOS, so we define a custom function.
          [ "$(command -v timeout)" ] || function timeout() { perl -e 'alarm shift; exec @ARGV' "$@"; }
          # Using `timeout` is a safeguard against the Poetry command hanging for some reason.
          timeout 10s poetry run pip --version || rm -rf .venv

      - name: Install dependencies
        shell: bash
        run: poetry install

      - name: Run mypy
        run: poetry run mypy

      - name: Run pytest
        shell: bash
        run: poetry run pytest -v tests
