# Build MPICH from source using the latest commit on the
# 'main' branch and cache the results. The result is compressed
# into a 'mpich.tar' archive to preserve permissions and
# then is uploaded as the artifact 'mpich' which can later
# be downloaded with 'actions/download-artifact' and then
# uncompressed with 'tar xvf mpich.tar -C <directory>'

# Triggers the workflow on a call from another workflow
on:
  workflow_call:
    inputs:
      build_mode:
        description: "Release vs. Debug build"
        required: true
        type: string

permissions:
  contents: read

jobs:
  ubuntu_gcc_build_and_test:
    name: "Build MPICH ${{ inputs.build_mode }} (GCC)"

    runs-on: ubuntu-latest

    steps:
      - name: Install Linux dependencies
        run: |
          sudo apt-get update
          sudo apt-get install build-essential libtool libtool-bin

      - name: Get MPICH source
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          repository: 'pmodels/mpich'
          path: 'mpich'
          submodules: recursive

      - name: Get MPICH commit hash
        shell: bash
        id: get-sha
        run: |
          cd $GITHUB_WORKSPACE/mpich
          export MPICH_SHA=$(git rev-parse HEAD)
          echo "MPICH_SHA=$MPICH_SHA" >> $GITHUB_ENV
          echo "sha=$MPICH_SHA" >> $GITHUB_OUTPUT
          # Output SHA for debugging
          echo "MPICH_SHA=$MPICH_SHA"

      - name: Cache MPICH (GCC) installation
        id: cache-mpich-ubuntu-gcc
        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v4
        with:
          path: ${{ runner.workspace }}/mpich
          key: ${{ runner.os }}-${{ runner.arch }}-gcc-mpich-${{ steps.get-sha.outputs.sha }}-${{ inputs.build_mode }}

      # Enable threads=multiple for testing with Subfiling and
      # VOL connectors that require MPI_THREAD_MULTIPLE
      - name: Install MPICH (GCC) (Release)
        if: ${{ steps.cache-mpich-ubuntu-gcc.outputs.cache-hit != 'true' && (inputs.build_mode == 'Release') }}
        run: |
          cd $GITHUB_WORKSPACE/mpich
          ./autogen.sh
          ./configure \
            CC=gcc \
            --prefix=${{ runner.workspace }}/mpich \
            --enable-threads=multiple
          make -j2
          make install

      # Enable threads=multiple for testing with Subfiling and
      # VOL connectors that require MPI_THREAD_MULTIPLE
      - name: Install MPICH (GCC) (Debug)
        if: ${{ steps.cache-mpich-ubuntu-gcc.outputs.cache-hit != 'true' && (inputs.build_mode == 'Debug') }}
        run: |
          cd $GITHUB_WORKSPACE/mpich
          ./autogen.sh
          ./configure \
            CC=gcc \
            --prefix=${{ runner.workspace }}/mpich \
            --enable-g=most \
            --enable-debuginfo \
            --enable-threads=multiple
          make -j2
          make install

      - name: Tar MPICH installation to preserve permissions for artifact
        run: tar -cvf mpich.tar -C ${{ runner.workspace }} mpich

      - name: Save MPICH installation artifact
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v5
        with:
          name: mpich
          path: mpich.tar
          if-no-files-found: error # 'warn' or 'ignore' are also available, defaults to `warn`