name: Install Nim
inputs:
  os:
    description: "Operating system to build for"
    required: true
  cpu:
    description: "CPU to build for"
    default: "amd64"
  nim_branch:
    description: "Nim version"
    default: "version-1-6"
  shell:
    description: "Shell to run commands in"
    default: "bash --noprofile --norc -e -o pipefail"

runs:
  using: "composite"
  steps:
    - name: Install build dependencies (Linux i386)
      shell: ${{ inputs.shell }}
      if: inputs.os == 'Linux' && inputs.cpu == 'i386'
      run: |
        sudo dpkg --add-architecture i386
        sudo apt-get update -qq
        sudo DEBIAN_FRONTEND='noninteractive' apt-get install \
          --no-install-recommends -yq gcc-multilib g++-multilib \
          libssl-dev:i386
        mkdir -p external/bin
        cat << EOF > external/bin/gcc
        #!/bin/bash
        exec $(which gcc) -m32 "\$@"
        EOF
        cat << EOF > external/bin/g++
        #!/bin/bash
        exec $(which g++) -m32 "\$@"
        EOF
        chmod 755 external/bin/gcc external/bin/g++
        echo '${{ github.workspace }}/external/bin' >> $GITHUB_PATH

    - name: MSYS2 (Windows i386)
      if: inputs.os == 'Windows' && inputs.cpu == 'i386'
      uses: msys2/setup-msys2@v2
      with:
        path-type: inherit
        msystem: MINGW32
        install: >-
          base-devel
          git
          mingw-w64-i686-toolchain

    - name: MSYS2 (Windows amd64)
      if: inputs.os == 'Windows' && inputs.cpu == 'amd64'
      uses: msys2/setup-msys2@v2
      with:
        path-type: inherit
        install: >-
          base-devel
          git
          mingw-w64-x86_64-toolchain

    - name: Restore Nim DLLs dependencies (Windows) from cache
      if: inputs.os == 'Windows'
      id: windows-dlls-cache
      uses: actions/cache@v3
      with:
        path: external/dlls
        key: 'dlls'

    - name: Install DLL dependencies (Windows)
      shell: ${{ inputs.shell }}
      if: >
        steps.windows-dlls-cache.outputs.cache-hit != 'true' &&
        inputs.os == 'Windows'
      run: |
        mkdir external
        curl -L "https://nim-lang.org/download/windeps.zip" -o external/windeps.zip
        7z x external/windeps.zip -oexternal/dlls

    - name: Path to cached dependencies (Windows)
      shell: ${{ inputs.shell }}
      if: >
        inputs.os == 'Windows'
      run: |
        echo '${{ github.workspace }}'"/external/dlls" >> $GITHUB_PATH

    - name: Derive environment variables
      shell: ${{ inputs.shell }}
      run: |
        if [[ '${{ inputs.cpu }}' == 'amd64' ]]; then
          PLATFORM=x64
        else
          PLATFORM=x86
        fi
        echo "PLATFORM=$PLATFORM" >> $GITHUB_ENV

        ncpu=
        MAKE_CMD="make"
        case '${{ inputs.os }}' in
        'Linux')
          ncpu=$(nproc)
          ;;
        'macOS')
          ncpu=$(sysctl -n hw.ncpu)
          ;;
        'Windows')
          ncpu=$NUMBER_OF_PROCESSORS
          MAKE_CMD="mingw32-make"
          ;;
        esac
        [[ -z "$ncpu" || $ncpu -le 0 ]] && ncpu=1
        echo "ncpu=$ncpu" >> $GITHUB_ENV
        echo "MAKE_CMD=${MAKE_CMD}" >> $GITHUB_ENV
        echo '${{ github.workspace }}/nim/bin' >> $GITHUB_PATH

    - name: Build Nim and Nimble
      shell: ${{ inputs.shell }}
      run: |
        rm -rf nim
        export NIMBLE_DIR=$HOME/.nimble
        curl -O -L -s -S https://raw.githubusercontent.com/status-im/nimbus-build-system/master/scripts/build_nim.sh
        env MAKE="${MAKE_CMD} -j${ncpu}" ARCH_OVERRIDE=${PLATFORM} NIM_COMMIT=${{ inputs.nim_branch }} \
          QUICK_AND_DIRTY_COMPILER=1 QUICK_AND_DIRTY_NIMBLE=1 CC=gcc \
          bash build_nim.sh nim csources ${NIMBLE_DIR} NimBinaries
        nimble install nimble -y
        rm -rf nim/bin/nimble
        ln -s $NIMBLE_DIR/bin/nimble nim/bin/nimble