name: CI testing

# https://help.github.com/en/actions/reference/events-that-trigger-workflows
on:
  # Trigger the workflow on push or pull request,
  # but only for the master branch
  push:
    branches:
      - master
  pull_request:
    branches:
      - master

jobs:
  build:

    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      # max-parallel: 6
      matrix:
        os: [ubuntu-18.04, windows-2016, macOS-10.15]
        python-version: [3.6, 3.7, 3.8]
        requires: ['minimal', 'latest']
        exclude:
          # excludes node 4 on macOS
          - python-version: 3.8
            requires: 'minimal'

    # Timeout: https://stackoverflow.com/a/59076067/4521646
    timeout-minutes: 15
    steps:
    - uses: actions/checkout@v2
    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@v1
      with:
        python-version: ${{ matrix.python-version }}

    # Github Actions: Run step on specific OS: https://stackoverflow.com/a/57948488/4521646
    - name: Setup macOS
      if: runner.os == 'macOS'
      run: |
        brew install libomp  # https://github.com/pytorch/pytorch/issues/20030

    - name: Set min. dependencies
      if: matrix.requires == 'minimal'
      run: |
        python -c "req = open('requirements.txt').read().replace('>', '=') ; open('requirements.txt', 'w').write(req)"
        python -c "req = open('requirements-extra.txt').read().replace('>', '=') ; open('requirements-extra.txt', 'w').write(req)"

    - name: Cache pip
      uses: actions/cache@v1
      with:
        path: ~/.cache/pip # This path is specific to Ubuntu
        # Look to see if there is a cache hit for the corresponding requirements file
        key: ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('requirements.txt') }}
        restore-keys: |
          ${{ runner.os }}-pip-${{ matrix.python-version }}-
          ${{ runner.os }}-${{ matrix.python-version }}-

    - name: Cache datasets
      uses: actions/cache@v1
      with:
        path: tests/Datasets # This path is specific to Ubuntu
        # Look to see if there is a cache hit for the corresponding requirements file
        key: mnist-dataset

    - name: Install dependencies
      run: |
        # python -m pip install --upgrade --user pip
        pip install -r requirements.txt -U -f https://download.pytorch.org/whl/torch_stable.html -q
        pip install -r ./tests/requirements.txt -q
        # pip install tox coverage
        python --version
        pip --version
        pip list

    - name: Tests
      # env:
      #   TOXENV: py${{ matrix.python-version }}
      run: |
        # tox --sitepackages
        # flake8 .
        coverage run --source pytorch_lightning -m py.test pytorch_lightning tests -v --doctest-modules --junitxml=junit/test-results-${{ runner.os }}-${{ matrix.python-version }}.xml
        coverage report

    - name: Upload pytest test results
      uses: actions/upload-artifact@master
      with:
        name: pytest-results-${{ runner.os }}-${{ matrix.python-version }}
        path: junit/test-results-${{ runner.os }}-${{ matrix.python-version }}.xml
      # Use always() to always run this step to publish test results when there are test failures
      if: always()

    - name: Package Setup
      run: |
        check-manifest
        python setup.py check --metadata --strict
        python setup.py sdist
        twine check dist/*

    #- name: Try install package
    #  if: ! startsWith(matrix.os, 'windows')
    #  run: |
    #    virtualenv vEnv ; source vEnv/bin/activate
    #    pip install --editable . ; cd .. & python -c "import pytorch_lightning ; print(pytorch_lightning.__version__)"
    #    deactivate ; rm -rf vEnv

    - name: Statistics
      if: success()
      run: |
         coverage report