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

  push:
    branches:
      - cmake
      - test_dev

  pull_request:
    branches:
      - cmake
      - test_dev

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      # Step 1: Checkout repository
      - name: Checkout repository
        uses: actions/checkout@v3

      # Step 2: Install dependencies (CMake and compiler)
      - name: Setup CMake and compiler
        run: |
          sudo apt update
          sudo apt install -y cmake build-essential mpich libmpich-dev libblas-dev liblapack-dev

      # Step 3: Set defaults for inputs when triggered by push/PR
      - name: Set default 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

      # Step 4: Configure CMake
      - name: Configure CMake
        run: cmake -S . -B build \
             -DCMAKE_BUILD_TYPE=$BUILD_TYPE \
             -DCMAKE_INSTALL_PREFIX=$INSTALL_PREFIX

      # Step 5: Build the project
      - name: Build
        run: cmake --build build -- -j$(nproc)

      # Step 6: Optional install
      - name: Install
        run: cmake --install build