name: "Lint error"
description: "Checks for lint errors and posts a helpful comment"

inputs:
  format-command:
    description: "The command to run to fix lint errors"
    required: true

  format-tool:
    description: "The name of the linting tool"
    required: true

runs:
  using: "composite"
  steps:
    - name: Run format command
      run: ${{ inputs.format-command }}
      shell: bash

    - name: Find changes
      id: changes
      run: |
        file=${{ inputs.format-tool }}.diff
        diff=$(git diff | tee $file)

        if [ -z "$diff" ]; then
          echo "No changes detected"
          exit 0
        fi

        echo "file=$file" >> $GITHUB_OUTPUT

        {
          echo "diff<<EOF"
          cat $file
          echo "EOF"
        } >> $GITHUB_OUTPUT

      shell: bash

    - name: Upload to GitHub
      id: upload
      if: steps.changes.outputs.diff
      uses: actions/upload-artifact@v4
      with:
        name: ${{ inputs.format-tool }}-diff
        path: ${{ steps.changes.outputs.file }}
        if-no-files-found: error

    - name: Set summary
      id: summary
      if: steps.changes.outputs.diff
      run: |
        code_block="\`\`\`"

        summary=$(cat<<EOF
        ❌ \`${{ inputs.format-tool }}\`: It looks like your changes don't match our code style.

        🛠️ Please either run \`${{ inputs.format-command }}\` or apply this patch with \`git apply\`:

        [\`${{ steps.changes.outputs.file }}\`](${{ steps.upload.outputs.artifact-url }})
        $code_block diff
        ${{ steps.changes.outputs.diff }}
        $code_block
        EOF
        )
        echo "$summary" >> $GITHUB_STEP_SUMMARY

        file="ci_summary.md"
        echo "❌🛠️ \`${{ inputs.format-tool }}\`: Lint errors, fix available." >> $file
        echo "file=$file" >> $GITHUB_OUTPUT
      shell: bash

    - name: Upload CI summary as artifact
      if: steps.summary.outputs.file
      uses: actions/upload-artifact@v4
      with:
        name: summary-${{ inputs.format-tool }}
        path: ${{ steps.summary.outputs.file }}
        if-no-files-found: error

    - name: Fail if diff exists
      if: steps.changes.outputs.diff
      run: exit 1
      shell: bash