name: CMake Build

on:
  workflow_dispatch:
    inputs:
      install_prefix:
        description: 'CMake install prefix (relative to workspace)'
        default: 'install'
        required: true
      build_type:
        description: 'CMake build type'
        default: 'Release'
        required: true
      run_install_only:
        description: 'Run only install step'
        default: 'false'
        required: true

  push:
    branches:
      - cmake
      - test_dev

  pull_request:
    branches:
      - cmake
      - test_dev

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      # Step 1: Checkout repository with full history for git describe
      - name: Checkout repository
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      # Step 2: Install dependencies (CMake, compiler, MPI, BLAS/LAPACK)
      - name: Setup dependencies
        run: |
          sudo apt update
          sudo apt install -y cmake build-essential mpich libmpich-dev libopenblas-dev liblapack-dev
          mpifort --version

      # Step 3: Set build variables
      - name: Set build variables
        run: |
          echo "BUILD_TYPE=${{ github.event.inputs.build_type || 'Release' }}" >> $GITHUB_ENV
          echo "INSTALL_PREFIX=${{ github.workspace }}/${{ github.event.inputs.install_prefix || 'install' }}" >> $GITHUB_ENV
          echo "RUN_INSTALL_ONLY=${{ github.event.inputs.run_install_only }}" >> $GITHUB_ENV

      - name: Set MPI environment
        run: |
          export PATH="/usr/lib/mpich/bin:$PATH"
          export MPI_HOME="/usr/lib/mpich"
          mpifort --version

      # Step 4: Cache CMake build directory
      - name: Cache CMake build
        uses: actions/cache@v3
        with:
          path: build
          key: build-${{ runner.os }}-${{ hashFiles('**/CMakeLists.txt') }}
          restore-keys: |
            build-${{ runner.os }}-

      # Step 5: Configure and build (skipped if run_install_only=true)
      - name: Configure and Build
        if: ${{ env.RUN_INSTALL_ONLY != 'true' }}
        run: |
          cmake -S . -B build \
            -DCMAKE_BUILD_TYPE=$BUILD_TYPE \
            -DCMAKE_INSTALL_PREFIX=$INSTALL_PREFIX \
            -DCMAKE_Fortran_COMPILER=mpifort \
            -DCMAKE_C_COMPILER=mpicc \
            -DMPI_C_COMPILER=mpicc \
            -DMPI_Fortran_COMPILER=mpifort
          cmake --build build -- -j$(nproc)

      # Step 6: Install
      - name: Install
        run: cmake --install build --prefix $INSTALL_PREFIX