name: CI

on:
  push:
  pull_request:
  release:
    types: [published]

env:
  CI: "ON" # We can detect this in the build system and other vendors implement it
  HOMEBREW_NO_ANALYTICS: "ON" # Make Homebrew installation a little quicker
  HOMEBREW_NO_AUTO_UPDATE: "ON"
  HOMEBREW_NO_BOTTLE_SOURCE_FALLBACK: "ON"
  HOMEBREW_NO_GITHUB_API: "ON"
  HOMEBREW_NO_INSTALL_CLEANUP: "ON"

jobs:

  build:
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-latest, windows-latest]
        gcc_v: [9] # Version of GFortran we want to use.
        include:
        - os: ubuntu-latest
          os-arch: linux-x86_64
          release-flags: --flag '--static -g -fbacktrace -O3'

        - os: macos-latest
          os-arch: macos-x86_64
          release-flags: --flag '-g -fbacktrace -O3'

        - os: windows-latest
          os-arch: windows-x86_64
          release-flags: --flag '--static -g -fbacktrace -O3'
          exe: .exe

    env:
      FC: gfortran
      GCC_V: ${{ matrix.gcc_v }}

    steps:
    - name: Checkout code
      uses: actions/checkout@v1

    - name: Install GFortran macOS
      if: contains(matrix.os, 'macos')
      run: |
        ln -s /usr/local/bin/gfortran-${GCC_V} /usr/local/bin/gfortran
        which gfortran-${GCC_V}
        which gfortran

    - name: Install GFortran Linux
      if: contains(matrix.os, 'ubuntu')
      run: |
        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-${GCC_V} 100 \
        --slave /usr/bin/gfortran gfortran /usr/bin/gfortran-${GCC_V} \
        --slave /usr/bin/gcov gcov /usr/bin/gcov-${GCC_V}

    # Phase 1: Bootstrap fpm with existing version
    - name: Install fpm
      uses: fortran-lang/setup-fpm@v3
      with:
        fpm-version: 'v0.2.0'

    - name: Remove fpm from path
      shell: bash
      run: |
        mv $(which fpm) fpm-bootstrap${{ matrix.exe }}
        echo "BOOTSTRAP=$PWD/fpm-bootstrap" >> $GITHUB_ENV

    - name: Build Fortran fpm (bootstrap)
      shell: bash
      run: |
        ${{ env.BOOTSTRAP }} build

    - name: Run Fortran fpm (bootstrap)
      shell: bash
      run: |
        ${{ env.BOOTSTRAP }} run
        ${{ env.BOOTSTRAP }} run -- --version
        ${{ env.BOOTSTRAP }} run -- --help

    - name: Test Fortran fpm (bootstrap)
      shell: bash
      run: |
        ${{ env.BOOTSTRAP }} test

    - name: Install Fortran fpm (bootstrap)
      shell: bash
      run: |
        ${{ env.BOOTSTRAP }} install

    # Phase 2: Bootstrap fpm with itself
    - name: Replace bootstrapping version
      shell: bash
      run: |
        ${{ env.BOOTSTRAP }} run --runner cp -- fpm-debug${{ matrix.exe }}
        rm -v ${{ env.BOOTSTRAP }}
        echo "FPM=$PWD/fpm-debug" >> $GITHUB_ENV

    - name: Get version (normal)
      if: github.event_name != 'release'
      shell: bash
      run: |
        VERSION=$(git rev-parse --short HEAD)
        echo "VERSION=$VERSION" >> $GITHUB_ENV

    - name: Get version (release)
      if: github.event_name == 'release'
      shell: bash
      run: |
        VERSION=$(echo ${{ github.ref }} | cut -dv -f2)
        echo "VERSION=$VERSION" >> $GITHUB_ENV
        FPM_VERSION=$(${{ env.FPM }} --version | grep -o '${{ env.REGEX }}')
        [ "$VERSION" = "$FPM_VERSION" ]
      env:
        REGEX: '[0-9]\{1,4\}\.[0-9]\{1,4\}\.[0-9]\{1,4\}'

    - name: Build example packages
      shell: bash
      run: |
        ci/run_tests.sh "${{ env.FPM }}"

    - name: Build Fortran fpm
      shell: bash
      run: |
        ${{ env.FPM }} build ${{ matrix.release-flags }}

    - name: Run Fortran fpm
      shell: bash
      run: |
        ${{ env.FPM }} run ${{ matrix.release-flags }}
        ${{ env.FPM }} run ${{ matrix.release-flags }} -- --version
        ${{ env.FPM }} run ${{ matrix.release-flags }} -- --help

    - name: Test Fortran fpm
      shell: bash
      run: |
        ${{ env.FPM }} test ${{ matrix.release-flags }}

    - name: Install Fortran fpm
      shell: bash
      run: |
        ${{ env.FPM }} install ${{ matrix.release-flags }}

    - name: Package release version
      shell: bash
      run: |
        ${{ env.FPM }} run ${{ matrix.release-flags }} --runner cp -- ${{ env.EXE }}
        rm -v ${{ env.FPM }}
        echo "FPM_RELEASE=${{ env.EXE }}" >> $GITHUB_ENV
      env:
        EXE: fpm-${{ env.VERSION }}-${{ matrix.os-arch }}${{ matrix.exe }}

    - name: Run release version
      shell: bash
      run: |
        ci/run_tests.sh "$PWD/${{ env.FPM_RELEASE }}"

    - name: Upload artifact
      uses: actions/upload-artifact@v2
      with:
        name: ${{ env.FPM_RELEASE }}
        path: ${{ env.FPM_RELEASE }}

  upload-artifacts:
    if: github.event_name == 'release'
    runs-on: ubuntu-latest
    needs:
      - build

    steps:
    - name: Download Artifacts
      uses: actions/download-artifact@v2
      with:
        path: ${{ github.workspace }} # This will download all files

    - name: Create SHA256 checksums
      run: |
        for output in fpm-*/fpm-*; do
          pushd $(dirname "$output")
          sha256sum $(basename "$output") | tee $(basename "$output").sha256
          popd
        done

    - name: Upload assets
      if: github.event_name == 'release'
      uses: svenstaro/upload-release-action@v2
      with:
        repo_token: ${{ secrets.GITHUB_TOKEN }}
        file: fpm-*/fpm-*
        file_glob: true
        tag: ${{ github.ref }}
        overwrite: true