name: 'Clang-Format Code Check'
description: 'Check code formatting of changed files using clang-format'
inputs:
  base-ref:
    description: 'Base reference to compare changes against'
    required: true
    default: 'master'
  file-pattern:
    description: 'Pattern to match files for formatting check'
    required: false
    default: '^(src)/.*\.(cpp|hxx|cxx|lxx|h|pxx|hpp)$'
  clang-format-version:
    description: 'Required clang-format version'
    required: false
    default: '18.1.8'

outputs:
  has-changes:
    description: 'Whether any files needed formatting'
    value: ${{ steps.git-check.outputs.has_changes }}

runs:
  using: "composite"
  steps:
    - name: Check clang-format version
      shell: pwsh
      run: |
        $version = clang-format --version
        Write-Output "Detected clang-format version: $version"
        $version | Select-String "${{ inputs.clang-format-version }}" >$null
        if ($LASTEXITCODE -ne 0) {
          echo "::error::Wrong clang-format version. Expected ${{ inputs.clang-format-version }}"
          Write-Output "Error: Version mismatch - expected ${{ inputs.clang-format-version }}"
          exit 1
        }

    - name: Get changed files
      id: changed-files
      shell: pwsh
      run: |
        $changedFiles = git diff --name-only origin/${{ inputs.base-ref }} HEAD |
          Where-Object { $_ -match '${{ inputs.file-pattern }}' }
        $changedFiles | Set-Content "changed_files.txt"
        if ($changedFiles.Count -gt 0) {
          echo "has_files=true" >> $env:GITHUB_OUTPUT
        }

    - name: Check formatting
      if: steps.changed-files.outputs.has_files == 'true'
      shell: pwsh
      run: |
        $files = Get-Content "changed_files.txt"
        $files | ForEach-Object -ThrottleLimit 8 -Parallel {
          clang-format -i -style=file $_
        }

    - name: Check git status
      id: git-check
      if: steps.changed-files.outputs.has_files == 'true'
      shell: pwsh
      run: |
        git diff > format.patch
        if ((Get-Item format.patch).length -gt 0) {
          echo "has_changes=true" >> $env:GITHUB_OUTPUT
        }

    - name: Upload patch
      if: steps.git-check.outputs.has_changes == 'true'
      uses: actions/upload-artifact@v4
      with:
        name: format-patch
        path: format.patch

    - name: Failing step for formatting issues
      if: steps.git-check.outputs.has_changes == 'true'
      shell: pwsh
      run: |
        echo "::error::Files need formatting. To fix: 1. Download format.patch 2. \"git apply format.patch\" 3. Commit and push"
        exit 1

branding:
  icon: 'check-square'
  color: 'green'