name: Preview build

on:
  workflow_call:

jobs:
  preview:
    name: Build preview

    runs-on: ubuntu-latest
    container:
      # If you change this version, change the numbers in the cache step,
      # .github/workflows/ci-emscripten.yml (2x) and os/emscripten/Dockerfile too.
      image: emscripten/emsdk:6.0.1

    steps:
    - name: Checkout
      uses: actions/checkout@v6
      with:
        ref: ${{ github.event.pull_request.head.sha }}

    - name: Name branch
      run: |
        git config --global --add safe.directory ${GITHUB_WORKSPACE}
        git checkout -b pr${{ github.event.pull_request.number }}

    - name: Setup cache
      uses: actions/cache@v5
      with:
        path: /emsdk/upstream/emscripten/cache
        # If you change this version, change the numbers in the image configuration step,
        # .github/workflows/ci-emscripten.yml (2x) and os/emscripten/Dockerfile too.
        key: 6.0.1-${{ runner.os }}

    - name: Add liblzma support
      run: |
        cp ${GITHUB_WORKSPACE}/os/emscripten/ports/liblzma.py /emsdk/upstream/emscripten/tools/ports/contrib/

    - name: Build (host tools)
      run: |
        mkdir build-host
        cd build-host

        echo "::group::CMake"
        cmake .. -DOPTION_TOOLS_ONLY=ON
        echo "::endgroup::"

        echo "::group::Build"
        echo "Running on $(nproc) cores"
        make -j$(nproc) tools
        echo "::endgroup::"

    - name: Install GCC problem matcher
      uses: ammaraskar/gcc-problem-matcher@master

    - name: Build
      run: |
        mkdir build
        cd build

        echo "::group::CMake"
        emcmake cmake .. \
          -DHOST_BINARY_DIR=../build-host \
          -DCMAKE_BUILD_TYPE=Release \
          # EOF
        echo "::endgroup::"

        echo "::group::Build"
        echo "Running on $(nproc) cores"
        cmake --build . -j $(nproc) --target openttd
        echo "::endgroup::"

    - name: Prepare preview
      run: |
        mkdir public

        cp build/openttd.data public/
        cp build/openttd.html public/
        cp build/openttd.js public/
        cp build/openttd.wasm public/

        mkdir pr
        echo ${{ github.event.pull_request.number }} > ./pr/number

    - name: Upload artifacts
      uses: actions/upload-artifact@v7
      with:
        name: pr${{ github.event.pull_request.number }}
        path: |
          public
          pr
        retention-days: 1