name: Setup LLVM
description: Install LLVM/Clang toolchain

inputs:
  version:
    description: LLVM major version
    required: true
  os_type:
    description: Target OS type (linux-glibc, linux-musl, macos, windows)
    required: true

outputs:
  cc:
    description: C compiler path
    value: ${{ steps.paths.outputs.cc }}
  cxx:
    description: C++ compiler path
    value: ${{ steps.paths.outputs.cxx }}
  ar:
    description: AR path
    value: ${{ steps.paths.outputs.ar }}
  ranlib:
    description: RANLIB path
    value: ${{ steps.paths.outputs.ranlib }}
  strip:
    description: Strip path
    value: ${{ steps.paths.outputs.strip }}
  ld:
    description: Linker path
    value: ${{ steps.paths.outputs.ld }}

runs:
  using: composite
  steps:
    - name: Install LLVM (Linux glibc)
      if: inputs.os_type == 'linux-glibc'
      shell: bash
      env:
        DEBIAN_FRONTEND: noninteractive
      run: |
        wget -qO- https://apt.llvm.org/llvm-snapshot.gpg.key | tee /etc/apt/trusted.gpg.d/apt.llvm.org.asc
        echo "deb https://apt.llvm.org/jammy/ llvm-toolchain-jammy-${{ inputs.version }} main" > /etc/apt/sources.list.d/llvm.list
        apt-get update
        apt-get install -y clang-${{ inputs.version }} lld-${{ inputs.version }} llvm-${{ inputs.version }}

    # linux-musl: LLVM installed via apk in workflow setup step
    # macos: LLVM installed via brew in workflow setup step
    # windows: Using MinGW toolchain

    - name: Set output paths
      id: paths
      shell: bash
      run: |
        case "${{ inputs.os_type }}" in
          linux-glibc)
            echo "cc=clang-${{ inputs.version }}" >> $GITHUB_OUTPUT
            echo "cxx=clang++-${{ inputs.version }}" >> $GITHUB_OUTPUT
            echo "ar=llvm-ar-${{ inputs.version }}" >> $GITHUB_OUTPUT
            echo "ranlib=llvm-ranlib-${{ inputs.version }}" >> $GITHUB_OUTPUT
            echo "strip=llvm-strip-${{ inputs.version }}" >> $GITHUB_OUTPUT
            echo "ld=lld-${{ inputs.version }}" >> $GITHUB_OUTPUT
            ;;
          linux-musl)
            echo "cc=clang" >> $GITHUB_OUTPUT
            echo "cxx=clang++" >> $GITHUB_OUTPUT
            echo "ar=llvm-ar" >> $GITHUB_OUTPUT
            echo "ranlib=llvm-ranlib" >> $GITHUB_OUTPUT
            echo "strip=llvm-strip" >> $GITHUB_OUTPUT
            echo "ld=lld" >> $GITHUB_OUTPUT
            ;;
          macos)
            LLVM_PREFIX=$(brew --prefix llvm)
            echo "cc=$LLVM_PREFIX/bin/clang" >> $GITHUB_OUTPUT
            echo "cxx=$LLVM_PREFIX/bin/clang++" >> $GITHUB_OUTPUT
            echo "ar=$LLVM_PREFIX/bin/llvm-ar" >> $GITHUB_OUTPUT
            echo "ranlib=$LLVM_PREFIX/bin/llvm-ranlib" >> $GITHUB_OUTPUT
            echo "strip=strip" >> $GITHUB_OUTPUT
            echo "ld=" >> $GITHUB_OUTPUT
            ;;
          windows)
            echo "cc=clang" >> $GITHUB_OUTPUT
            echo "cxx=clang++" >> $GITHUB_OUTPUT
            echo "ar=llvm-ar" >> $GITHUB_OUTPUT
            echo "ranlib=llvm-ranlib" >> $GITHUB_OUTPUT
            echo "strip=llvm-strip" >> $GITHUB_OUTPUT
            echo "ld=lld" >> $GITHUB_OUTPUT
            ;;
        esac