name: Add Labels

on:
  pull_request_target:
    types: [ opened, edited, synchronize ]

jobs:
  check-title:
    runs-on: ubuntu-latest
    steps:
      - name: Check PR title
        env:
          PR_TITLE: ${{ github.event.pull_request.title }}
        run: |
          echo "Checking PR Title: '$PR_TITLE'"
          if [[ ! "$PR_TITLE" =~ ^Answer: ]]; then
            echo "❌ PR title should start with 'Answer:[#challenge number]'"
            echo "### ❌ PR title should start with 'Answer:[#challenge number]'" >> $GITHUB_STEP_SUMMARY
            exit 1
          else
            echo "✅ PR title format is correct."
            echo "### ✅ PR title format is correct." >> $GITHUB_STEP_SUMMARY
          fi
  add_labels:
    runs-on: ubuntu-latest
    if: ${{ startsWith(github.event.pull_request.title, 'Answer') }}
    steps:
      - name: checkout
        uses: actions/checkout@v2

      - name: Install dependencies
        run: npm i @actions/core @actions/github

      - name: Add labels
        uses: ./.github/github-action/
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}