name: Install dependencies
description: Setup spack and install dependencies

inputs:
  gcc:
    description: 'GCC version to use'
    required: true
  env:
    description: 'Spack environment name (latest, boost187)'
    default: 'latest'
  fresh:
    description: 'Use fresh concretization'
    default: 'false'
  push-gcc:
    description: 'Push the freshly-built gcc node to the buildcache (buildcache workflow only)'
    default: 'false'
  push-token:
    description: 'Token with packages:write, required when push-gcc is true'
    default: ''

runs:
  using: composite
  # Composite action step names are not shown in the UI (https://github.com/actions/runner/issues/1877),
  # so we use ::group:: to make them visible.
  steps:
    - name: Setup spack
      uses: spack/setup-spack@v3
      with:
        color: true
        buildcache: true

    - name: Find system compiler
      shell: spack-bash {0}
      run: |
        echo "::group::Find system compiler"
        spack compiler find
        echo "::endgroup::"

    - name: Add FairMQ buildcache mirror
      shell: spack-bash {0}
      run: |
        echo "::group::Add FairMQ buildcache mirror"
        spack mirror add --unsigned --type binary \
          ghcr-buildcache oci://ghcr.io/fairrootgroup/fairmq-spack-buildcache
        echo "::endgroup::"

    - name: Install GCC
      shell: spack-bash {0}
      env:
        GITHUB_TOKEN: ${{ inputs.push-token }}
      run: |
        echo "::group::Install GCC"
        spack install ${{ inputs.fresh == 'true' && '--fresh' || '' }} gcc@${{ inputs.gcc }} target=x86_64_v3
        gcc_hash=$(spack find --json gcc@${{ inputs.gcc }} target=x86_64_v3 | jq -r 'sort_by(.version | split(".") | map(tonumber)) | last | .hash')
        if [ "${{ inputs.push-gcc }}" = "true" ]; then
          # Push the gcc node now, BEFORE `spack compiler find` registers it as an
          # external -- externals are excluded from `buildcache push`. This is what
          # lets CI pull gcc from the cache (~1 min) instead of building it (~1 h).
          # --allow-missing: when gcc itself was pulled from the cache, its
          # build-time dependencies are not installed locally and would
          # otherwise fail the push.
          spack mirror set --oci-username ${{ github.actor }} --oci-password-variable GITHUB_TOKEN ghcr-buildcache
          spack buildcache push --unsigned --allow-missing ghcr-buildcache /$gcc_hash
        fi
        spack compiler find "$(spack location -i /$gcc_hash)"
        echo "::endgroup::"

    - name: Install dependencies
      shell: spack-bash {0}
      run: |
        echo "::group::Install dependencies"
        spack env create fairmq test/ci/spack-${{ inputs.env }}.yaml
        spack -e fairmq add gcc@${{ inputs.gcc }}
        spack -e fairmq config add "packages:all:require:'%gcc@${{ inputs.gcc }}'"
        spack -e fairmq install --fail-fast ${{ inputs.fresh == 'true' && '--fresh' || '' }}
        spack env activate --sh fairmq | grep '^export ' | sed 's/^export //;s/;$//' >> $GITHUB_ENV
        echo "::endgroup::"