name: build
description: 'Builds the project with ccache integration'

inputs:
  generator:
    description: 'CMake generator to use'
    required: true
  configuration:
    description: 'Build configuration (Debug, Release, etc.)'
    required: true
  build_dir:
    description: 'Directory to build in'
    required: false
    default: '.build'
  cc:
    description: 'C compiler to use'
    required: false
    default: ''
  cxx:
    description: 'C++ compiler to use'
    required: false
    default: ''
  compiler-id:
    description: 'Unique identifier for compiler/version combination used for cache keys'
    required: false
    default: ''
  cache_version:
    description: 'Cache version for invalidation'
    required: false
    default: '1'
  ccache_enabled:
    description: 'Whether to use ccache'
    required: false
    default: 'true'
  main_branch:
    description: 'Main branch name for restore keys'
    required: false
    default: 'dev'

runs:
  using: 'composite'
  steps:
    - name: Generate safe branch name
      if: inputs.ccache_enabled == 'true'
      id: safe-branch
      shell: bash
      run: |
        SAFE_BRANCH=$(echo "${{ github.ref_name }}" | tr -c 'a-zA-Z0-9_.-' '-')
        echo "name=${SAFE_BRANCH}" >> $GITHUB_OUTPUT

    - name: Restore ccache directory for default branch
      if: inputs.ccache_enabled == 'true'
      id: ccache-restore
      uses: actions/cache/restore@v4
      with:
        path: ~/.ccache-main
        key: ${{ runner.os }}-ccache-v${{ inputs.cache_version }}-${{ inputs.compiler-id }}-${{ inputs.configuration }}-${{ inputs.main_branch }}
        restore-keys: |
          ${{ runner.os }}-ccache-v${{ inputs.cache_version }}-${{ inputs.compiler-id }}-${{ inputs.configuration }}-
          ${{ runner.os }}-ccache-v${{ inputs.cache_version }}-${{ inputs.compiler-id }}-

    - name: Restore ccache directory for current branch
      if: inputs.ccache_enabled == 'true' && steps.safe-branch.outputs.name != inputs.main_branch
      id: ccache-restore-current-branch
      uses: actions/cache/restore@v4
      with:
        path: ~/.ccache-current
        key: ${{ runner.os }}-ccache-v${{ inputs.cache_version }}-${{ inputs.compiler-id }}-${{ inputs.configuration }}-${{ steps.safe-branch.outputs.name }}
        restore-keys: |
          ${{ runner.os }}-ccache-v${{ inputs.cache_version }}-${{ inputs.compiler-id }}-${{ inputs.configuration }}-${{ inputs.main_branch }}
          ${{ runner.os }}-ccache-v${{ inputs.cache_version }}-${{ inputs.compiler-id }}-${{ inputs.configuration }}-
          ${{ runner.os }}-ccache-v${{ inputs.cache_version }}-${{ inputs.compiler-id }}-

    - name: Configure project
      shell: bash
      run: |
        mkdir -p ${{ inputs.build_dir }}
        cd ${{ inputs.build_dir }}
        
        # Set compiler environment variables if provided
        if [ -n "${{ inputs.cc }}" ]; then
          export CC="${{ inputs.cc }}"
        fi
        
        if [ -n "${{ inputs.cxx }}" ]; then
          export CXX="${{ inputs.cxx }}"
        fi
        
        
        # Configure ccache launcher args
        CCACHE_ARGS=""
        if [ "${{ inputs.ccache_enabled }}" = "true" ]; then
          CCACHE_ARGS="-DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache"
        fi
        
        # Run CMake configure
        # Note: conanfile.py hardcodes 'build/generators' as the output path.
        # If we're in a 'build' folder, Conan detects this and uses just 'generators/'
        # If we're in '.build' (non-standard), Conan adds the full 'build/generators/'
        # So we get: .build/build/generators/ with our non-standard folder name
        cmake .. \
          -G "${{ inputs.generator }}" \
          $CCACHE_ARGS \
          -DCMAKE_TOOLCHAIN_FILE:FILEPATH=build/generators/conan_toolchain.cmake \
          -DCMAKE_BUILD_TYPE=${{ inputs.configuration }}

    - name: Build project
      shell: bash
      run: |
        cd ${{ inputs.build_dir }}
        cmake --build . --config ${{ inputs.configuration }} --parallel $(nproc)

    - name: Show ccache statistics
      if: inputs.ccache_enabled == 'true'
      shell: bash
      run: ccache -s

    - name: Save ccache directory for default branch
      if: always() && inputs.ccache_enabled == 'true' && steps.safe-branch.outputs.name == inputs.main_branch
      uses: actions/cache/save@v4
      with:
        path: ~/.ccache-main
        key: ${{ steps.ccache-restore.outputs.cache-primary-key }}

    - name: Save ccache directory for current branch
      if: always() && inputs.ccache_enabled == 'true' && steps.safe-branch.outputs.name != inputs.main_branch
      uses: actions/cache/save@v4
      with:
        path: ~/.ccache-current
        key: ${{ steps.ccache-restore-current-branch.outputs.cache-primary-key }}