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'

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:
        ref: v1.1.0
        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"
        # Register the mirror globally (the env yamls only configure it inside the
        # env, which is created *after* gcc is installed) so that the "Install GCC"
        # step below can pull the compiler as a binary instead of building it from
        # source (~58 min/job otherwise).
        spack mirror add --unsigned --type binary \
          ghcr-buildcache oci://ghcr.io/fairrootgroup/fairmq-spack-buildcache
        echo "::endgroup::"

    - name: Resolve lockfile
      id: lock
      shell: bash
      run: |
        # Prefer a committed, fully-concretized lockfile so the hashes match the
        # binaries the buildcache pushed (guaranteed cache hits, no re-solve).
        # Fresh runs (the buildcache itself) must re-concretize, so skip the lock.
        lock="test/ci/locks/${{ inputs.env }}-gcc${{ inputs.gcc }}.lock"
        if [ "${{ inputs.fresh }}" != "true" ] && [ -f "$lock" ]; then
          echo "Using committed lockfile: $lock"
          echo "use=true" >> "$GITHUB_OUTPUT"
          echo "path=$lock" >> "$GITHUB_OUTPUT"
        else
          echo "No lockfile for ${{ inputs.env }}-gcc${{ inputs.gcc }}; concretizing from spec"
          echo "use=false" >> "$GITHUB_OUTPUT"
        fi

    - name: Install GCC
      if: steps.lock.outputs.use != 'true'
      shell: spack-bash {0}
      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')
        spack compiler find "$(spack location -i /$gcc_hash)"
        echo "::endgroup::"

    - name: Install dependencies
      if: steps.lock.outputs.use != 'true'
      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' || '' }}
        echo "::endgroup::"

    - name: Install dependencies (from lockfile)
      if: steps.lock.outputs.use == 'true'
      shell: spack-bash {0}
      run: |
        echo "::group::Install dependencies (from lockfile)"
        spack env create fairmq ${{ steps.lock.outputs.path }}
        spack -e fairmq install --fail-fast
        echo "::endgroup::"

    - name: Export environment
      shell: spack-bash {0}
      run: |
        echo "::group::Export environment"
        spack env activate --sh fairmq | grep '^export ' | sed 's/^export //;s/;$//' >> $GITHUB_ENV
        echo "::endgroup::"