---
name: CI

on:
  push:
    branches: [main]
    tags: ["*"]
  pull_request:
    branches: [main]
  workflow_dispatch:

env:
  FORCE_COLOR: "1" # Make tools pretty.
  TOX_TESTENV_PASSENV: FORCE_COLOR
  PIP_DISABLE_PIP_VERSION_CHECK: "1"
  PIP_NO_PYTHON_VERSION_WARNING: "1"
  # Keep in sync with .pre-commit-config.yaml/default_language_version/python.
  PYTHON_LATEST: "3.11"
  # Avoid warnings about shallow checkout, but also make sure pytest accepts us.
  SETUPTOOLS_SCM_PRETEND_VERSION: "99.9.9"

permissions:
  contents: read

jobs:
  tests:
    name: Tests on ${{ matrix.python-version }}
    runs-on: ubuntu-latest

    strategy:
      fail-fast: false
      matrix:
        python-version:
          - "3.7"
          - "3.8"
          - "3.9"
          - "3.10"
          - "3.11"
          - "~3.12.0-0"
          - "pypy-3.7"
          - "pypy-3.8"

    continue-on-error: >-
      ${{ contains(matrix.python-version, '~') && true || false }}

    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-python@v4
        with:
          python-version: ${{ matrix.python-version }}
      - run: python -Im pip install --upgrade wheel tox

      - name: Determine Python version for tox
        run: |
          V=${{ matrix.python-version }}
          if [[ "$V" = ~* ]]; then
            # Extract version from a '~3.XX.0-0' specifier.
            V=${V:1:4}
          fi

          if [[ "$V" = pypy-* ]]; then
            V=pypy3
          else
            V=py$(echo $V | tr -d .)
          fi

          echo TOX_PYTHON=$V >>$GITHUB_ENV

      - run: python -Im tox run -f ${{ env.TOX_PYTHON }}

      - name: Upload coverage data
        uses: actions/upload-artifact@v3
        with:
          name: coverage-data
          path: .coverage.*
          if-no-files-found: ignore

  coverage:
    runs-on: ubuntu-latest
    needs: tests

    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-python@v4
        with:
          # Use latest Python, so it understands all syntax.
          python-version: ${{env.PYTHON_LATEST}}

      - run: python -Im pip install --upgrade coverage[toml]

      - name: Download coverage data
        uses: actions/download-artifact@v3
        with:
          name: coverage-data

      - name: Combine coverage and fail if it's <100%.
        run: |
          python -Im coverage combine
          python -Im coverage html --skip-covered --skip-empty
          python -Im coverage report --fail-under=100

      - name: Upload HTML report if check failed.
        uses: actions/upload-artifact@v3
        with:
          name: html-report
          path: htmlcov
        if: ${{ failure() }}

  docs:
    name: Build docs & run doctests
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-python@v4
        with:
          # Keep in sync with tox/docs and .readthedocs.yaml.
          python-version: "3.11"

      - run: python -Im pip install --upgrade wheel tox
      - run: python -Im tox -e docs,changelog

  mypy:
    name: Mypy on ${{ matrix.python-version }}
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        python-version:
          - "3.7"
          - "3.8"
          - "3.9"
          - "3.10"
          - "3.11"

    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-python@v4
        with:
          python-version: ${{ matrix.python-version }}

      - run: python -Im pip install --upgrade wheel tox
      - run: python -Im tox run -e mypy

  pyright:
    name: Check types using pyright
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-python@v4
        with:
          python-version: ${{env.PYTHON_LATEST}}

      - run: python -Im pip install --upgrade wheel tox
      - run: python -Im tox run -e pyright

  install-dev:
    name: Verify dev env
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [ubuntu-latest, windows-latest]

    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-python@v4
        with:
          python-version: ${{env.PYTHON_LATEST}}
      - run: python -Im pip install -e .[dev]
      - run: python -Ic 'import attr; print(attr.__version__)'
      - run: python -Ic 'import attrs; print(attrs.__version__)'

  # Ensure everything required is passing for branch protection.
  required-checks-pass:
    if: always()

    needs:
      - coverage
      - docs
      - install-dev
      - mypy
      - pyright

    runs-on: ubuntu-latest

    steps:
      - name: Decide whether the needed jobs succeeded or failed
        uses: re-actors/alls-green@release/v1
        with:
          jobs: ${{ toJSON(needs) }}