name: Black Formatter Check

on:
  pull_request:
    types: [opened, synchronize, reopened]

jobs:
  black-check:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v3

      - name: Get commit messages
        id: commits
        run: |
          messages=$(gh pr view ${{ github.event.pull_request.number }} --repo ${{ github.repository }} --json commits --jq '.commits[].message')
          if echo "$messages" | grep -q "chore: format code with black"; then
            echo "skip=true" >> $GITHUB_OUTPUT
          else
            echo "skip=false" >> $GITHUB_OUTPUT
          fi
        env:
          GH_TOKEN: ${{ secrets.GH_TOKEN }}

      - name: Set up Python 3.x
        if: steps.commits.outputs.skip == 'false'
        uses: actions/setup-python@v4
        with:
          python-version: '3.x'

      - name: Install black
        if: steps.commits.outputs.skip == 'false'
        run: pip install black

      - name: Run black --check
        if: steps.commits.outputs.skip == 'false'
        id: black-check
        run: |
          black . --check
        continue-on-error: true

      - name: Comment on PR (success)
        if: steps.commits.outputs.skip == 'false' && steps.black-check.outcome == 'success'
        uses: actions/github-script@v6
        with:
          github-token: ${{ secrets.GH_TOKEN }}
          script: |
            github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: "> [!NOTE]\n> 🎉 Black 포매팅 검사가 성공적으로 완료되었어요.\n`/review`로 리뷰를 요청하실 수 있어요."
            })

      - name: Comment on PR (failure)
        if: steps.commits.outputs.skip == 'false' && steps.black-check.outcome == 'failure'
        uses: actions/github-script@v6
        with:
          github-token: ${{ secrets.GH_TOKEN }}
          script: |
            github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: "> [!WARNING]\n> 😢 코드 포매팅이 필요해요.\n`black .` 명령어로 코드를 포매팅하거나 `/format` 명령어를 사용해 주세요."
            })