name: Spack Buildcache

on:
  workflow_dispatch:
  schedule:
    - cron: '0 3 * * 0'  # Weekly on Sunday at 3am UTC
  push:
    paths:
      - 'test/ci/spack.yaml'
      - '.github/workflows/buildcache.yml'

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  build:
    if: github.repository == 'FairRootGroup/FairMQ'
    name: gcc-${{ matrix.gcc }}
    runs-on: ubuntu-latest
    permissions:
      packages: write
    strategy:
      fail-fast: false
      matrix:
        gcc: ['12', '13', '14', '15']

    env:
      GITHUB_USER: ${{ github.actor }}
      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

    steps:
      - uses: actions/checkout@v4

      - name: Setup spack
        uses: spack/setup-spack@v2
        with:
          ref: v1.1.0
          color: true
          buildcache: true

      - name: Create environment and login to OCI registry
        shell: spack-bash {0}
        run: |
          spack env create fairmq test/ci/spack.yaml
          spack -e fairmq mirror set --oci-username ${{ github.actor }} --oci-password-variable GITHUB_TOKEN ghcr-buildcache

      - name: Find system compiler
        shell: spack-bash {0}
        run: spack compiler find

      - name: Install GCC
        shell: spack-bash {0}
        run: |
          spack install --fresh gcc@${{ matrix.gcc }}
          spack compiler find $(spack location -i gcc@${{ matrix.gcc }})

      - name: Install dependencies
        shell: spack-bash {0}
        run: |
          spack -e fairmq add gcc@${{ matrix.gcc }}
          spack -e fairmq config add "packages:all:require:'%gcc@${{ matrix.gcc }}'"
          spack -e fairmq install --fail-fast --fresh

      - name: Push to buildcache
        if: ${{ !cancelled() }}
        shell: spack-bash {0}
        run: spack -e fairmq buildcache push --unsigned ghcr-buildcache

  update-index:
    if: github.repository == 'FairRootGroup/FairMQ' && !cancelled()
    needs: build
    runs-on: ubuntu-latest
    env:
      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
    permissions:
      packages: write
    steps:
      - uses: actions/checkout@v4

      - name: Setup spack
        uses: spack/setup-spack@v2
        with:
          ref: v1.1.0
          color: true

      - name: Update buildcache index
        shell: spack-bash {0}
        run: |
          spack env create fairmq test/ci/spack.yaml
          spack -e fairmq mirror set --oci-username ${{ github.actor }} --oci-password-variable GITHUB_TOKEN ghcr-buildcache
          spack -e fairmq buildcache update-index ghcr-buildcache