name: CI

on:
  pull_request:
    branches: [ master ]

jobs:

  build:
    name: Build
    strategy:
      matrix:
        go-version: [1.21.x, 1.20.x]
        platform: [ubuntu-20.04, macos-latest]
    runs-on: ${{ matrix.platform }}
    env:
        GO111MODULE: on
        GOPATH: ${{ github.workspace }}
        DISPLAY: ":99.0"
        EGL_PLATFORM: "x11"
    defaults:
        run:
            working-directory: ${{ env.GOPATH }}/src/gonum.org/v1/plot

    steps:
    - name: Install Go
      uses: actions/setup-go@v3
      with:
        go-version: ${{ matrix.go-version }}

    - name: Checkout code
      uses: actions/checkout@v3
      with:
        path: ${{ env.GOPATH }}/src/gonum.org/v1/plot
        fetch-depth: 1

    - name: Cache-Go
      uses: actions/cache@v3
      with:
        # In order:
        # * Module download cache
        # * Build cache (Linux)
        # * Build cache (Mac)
        # * Build cache (Windows)
        path: |
            ~/go/pkg/mod
            ~/.cache/go-build
            ~/Library/Caches/go-build
            '%LocalAppData%\go-build'
        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
        restore-keys: |
          ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}

    - name: Install Linux packages
      if: matrix.platform == 'ubuntu-20.04'
      run: |
        sudo apt-get update
        sudo apt-get install -qq gcc pkg-config libwayland-dev libx11-dev libx11-xcb-dev libxkbcommon-x11-dev libgles2-mesa-dev libegl1-mesa-dev libffi-dev libxcursor-dev libvulkan-dev xvfb xdotool
        # start a virtual frame buffer
        Xvfb :99 -screen 0 1920x1024x24 &

    - name: Check copyrights+formatting
      run: |
          # Required for format check.
          go install golang.org/x/tools/cmd/goimports@latest
          # Required for imports check.
          go install gonum.org/v1/tools/cmd/check-imports@latest
          # Required for copyright header check.
          go install gonum.org/v1/tools/cmd/check-copyright@latest

          ./.ci/check-copyright.sh
          ./.ci/check-formatting.sh

    - name: Build
      run: |
        go install -v ./...

    - name: Test Linux
      if: matrix.platform == 'ubuntu-20.04'
      run: |
        go test -v ./...
        ./.ci/check-imports.sh
        ./.ci/test-coverage.sh

    - name: Test Windows
      if: matrix.platform == 'windows-latest'
      run: |
        go test -v ./...

    - name: Test Darwin
      if: matrix.platform == 'macos-latest'
      run: |
        go test -v ./...

    - name: Upload-Coverage
      if: matrix.platform == 'ubuntu-20.04'
      uses: codecov/codecov-action@v2