# We use `workflow_run` to securely add a comment to the PR.
# PRs opened by external forks do not have write access to their PR, so can't add comments.
name: PR lint comment

on:
  workflow_run:
    workflows: ["Lint Clang", "Lint CMake"]
    types:
      - completed

jobs:
  upload:
    runs-on: ubuntu-latest
    if: github.event.workflow_run.event == 'pull_request'

    steps:
      - name: Download artifact
        if: github.event.workflow_run.conclusion == 'failure'
        id: download
        uses: actions/download-artifact@v4
        with:
          run-id: ${{ github.event.workflow_run.id }}

      - name: Debug
        run: ls -R

      - name: Read diff file
        id: changes
        run: |
          file=$(find . -name '*.diff')
          if [ -z "$file" ]; then
            echo "No changes detected"
            exit 0
          fi

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

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

            🛠️ Please apply this patch with `git apply`:
            ```diff
            ${{ steps.changes.outputs.diff }}
            ```

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