name: Auto Label PRs

on:
  pull_request:
    types: [opened, edited]

jobs:
  label:
    runs-on: ubuntu-latest
    steps:
      - name: Apply labels based on PR title
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_TITLE: ${{ github.event.pull_request.title }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          REPO_OWNER: ${{ github.repository_owner }}
          REPO_NAME: ${{ github.event.repository.name }}
          API_URL: ${{ github.api_url }}
        run: |
          shopt -s nocasematch
          
          labels="["
          
          if [[ "$PR_TITLE" =~ ^(ci|test)(/|:) ]]; then
            labels="${labels}13," # 13 is Kind/Testing
          fi
          
          if [[ "$PR_TITLE" =~ ^docs(/|:) ]]; then
            labels="${labels}14," # 14 is Kind/Documentation
          fi
          
          labels="${labels%,}]"
          
          if [ "$labels" != "[]" ]; then
            echo "Adding labels to PR #${PR_NUMBER}: ${labels}"
            curl -X POST "${API_URL}/repos/${REPO_OWNER}/${REPO_NAME}/issues/${PR_NUMBER}/labels" \
              -H "Authorization: token ${GITHUB_TOKEN}" \
              -H "Content-Type: application/json" \
              -d "{\"labels\": ${labels}}"
          else
            echo "No matching prefixes found in title: ${PR_TITLE}"
          fi