name: CI

on: [pull_request, push]

jobs:
  mix_test:
    strategy:
      fail-fast: false
      matrix:
        include:
          - pair:
              elixir: "1.12"
              otp: "24"
            report_coverage: true
            lint: true

    runs-on: ubuntu-20.04

    services:
      db:
        image: postgres:13
        ports: ["5432:5432"]
        env:
          POSTGRES_PASSWORD: postgres
        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5

    env:
      MIX_ENV: test
      ELIXIR_ASSERT_TIMEOUT: 1000
      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

    steps:
      - uses: actions/checkout@v2.3.5
      - uses: erlef/setup-beam@v1.9
        with:
          otp-version: ${{ matrix.pair.otp }}
          elixir-version: ${{ matrix.pair.elixir }}
      - uses: actions/cache@v2.1.6
        with:
          path: |
            deps
            _build
            priv/cldr/locales
          key: ${{ runner.os }}-${{ matrix.pair.elixir }}-${{ matrix.pair.otp }}-mix-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
          restore-keys: |
            ${{ runner.os }}-${{ matrix.pair.elixir }}-${{ matrix.pair.otp }}-mix-
      - name: Install Dependencies
        run: mix deps.get
      - name: Check Formatting
        run: mix format --check-formatted
        if: ${{ matrix.lint }}
      - name: Check unused dependencies
        run: mix deps.unlock --check-unused
        if: ${{ matrix.lint }}
      - name: Compile dependencies
        run: mix deps.compile
      - name: Check for compilation warnings
        run: mix compile --warnings-as-errors
        if: ${{ matrix.lint }}
      - name: Run Tests
        run: mix test
      - name: Check Coverage
        if: github.ref == 'refs/heads/master' && matrix.report_coverage
        run: mix coveralls.github
        continue-on-error: true