name: "Build system config"
on:
  pull_request:
  workflow_dispatch:
  push:
    branches: [ main ]

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
      with:
        fetch-depth: 0
    - name: Install Nix
      uses: DeterminateSystems/nix-installer-action@v4
    - name: Run the Magic Nix Cache
      uses: DeterminateSystems/magic-nix-cache-action@v2
    - name: nix flake check
      run: |
        nix flake check --no-build
        echo "## \`nix flake check\` succeeded" >> $GITHUB_STEP_SUMMARY
        echo "" >> $GITHUB_STEP_SUMMARY
    - name: Discover nixosConfigurations
      run: |
        echo Discovered the following system configs
        nix flake show . --json | jq ".nixosConfigurations|keys[]" -r
    - name: Build systems
      id: build
      run: |
        echo "## Building" >> $GITHUB_STEP_SUMMARY
        echo "" >> $GITHUB_STEP_SUMMARY
        echo "|     | Host | Out path |" >> $GITHUB_STEP_SUMMARY
        echo "| --- | ---- | -------- |" >> $GITHUB_STEP_SUMMARY
        any_failed=false
        for host in $(nix flake show . --json | jq ".nixosConfigurations|keys[]" -r); do
          echo "::group::Building ${host}"
          drv=".#nixosConfigurations.$host.config.system.build.toplevel"
          build_cmd="nix build ${drv}"
          failed=false
          $build_cmd --show-trace || { failed=true; any_failed=true; }
          echo "::endgroup::"
          if ! $failed; then
            symbol="✅"
            out_path=$($build_cmd --print-out-paths)
            out_path="\`${out_path}\`"
            echo -e "\x1b[32;1mSuccessfully built .#nixosConfigurations.${host}\x1b[0m"
          else
            symbol="❌"
            out_path="_build failed_"
            echo -e "\x1b[31;1mFailed to build .#nixosConfigurations.${host}\x1b[0m"
          fi
          echo "| $symbol | ${host} | ${out_path} |" >> $GITHUB_STEP_SUMMARY
        done
        # Set return-code to 1 if any failed
        ! $any_failed
    - name: Diff closures
      # Still would like to see the changes for the non-failing hosts
      if: ${{ success() }} || ${{ failure() }}
      run: ./.github/scripts/diff-hosts.sh