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

inputs:
  comment-header:
    description: "The header ID for the comment"
    required: true

  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: ${{ steps.changes.outputs.file }}
        path: ${{ steps.changes.outputs.file }}
        retention-days: 3
        if-no-files-found: error

    - name: PR comment (lint source hint)
      if: steps.changes.outputs.diff
      uses: marocchino/sticky-pull-request-comment@v2
      with:
        header: ${{ inputs.comment-header }}
        message: |
          ❌ `${{ inputs.format-tool }}` failed: It looks like your changes don't match our code style.

          🛠️ Please either run `${{ inputs.format-command }}` or apply this patch with `git apply`:
          ```diff
          ${{ steps.changes.outputs.diff }}
          ```
          [${{ steps.changes.outputs.file }}](${{ steps.upload.outputs.artifact-url }})

    - name: Delete PR comment
      if: ${{ !steps.changes.outputs.diff }}
      uses: marocchino/sticky-pull-request-comment@v2
      with:
        header: ${{ inputs.comment-header }}
        delete: true

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