name: Validate Pull Request
on:
  pull_request:
    types:
      - opened
      - reopened
      - synchronize
      - labeled
      - unlabeled
      - edited

permissions: {}

jobs:
  required-labels-missing:
    name: required labels missing
    runs-on: ubuntu-slim
    steps:
      - name: check
        if: >-
          !contains(github.event.pull_request.labels.*.name, '💥 breaking-change')
          && !contains(github.event.pull_request.labels.*.name, '✨ enhancement')
          && !contains(github.event.pull_request.labels.*.name, '🐞 bug')
          && !contains(github.event.pull_request.labels.*.name, '📖 docs')
          && !contains(github.event.pull_request.labels.*.name, 'chore')
          && !contains(github.event.pull_request.labels.*.name, '🛠️ dependencies')
        run: >-
          echo One of the following labels is missing on this PR:
          breaking-change
          enhancement
          bug
          docs
          chore
          && exit 1
  title:
    name: check title prefix
    runs-on: ubuntu-slim
    permissions:
      contents: read
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          persist-credentials: 'false'

      - name: check
        run: |
          PR_TITLE_PREFIX="${PR_TITLE%%:*}"
          SCOPED_PREFIX_PATTERN='^([^():]+)\(.*\)(:|$)'
          if [[ "$PR_TITLE" =~ $SCOPED_PREFIX_PATTERN ]]; then
            PR_TITLE_PREFIX="${BASH_REMATCH[1]}"
          fi

          for directory in internal/collector internal pkg .; do
            if [[ -d "$directory/$PR_TITLE_PREFIX" ]]; then
              exit 0
            fi
          done

          case "$PR_TITLE_PREFIX" in
            docs|ci|revert|fix|feat|chore|mixin|main|'*'|Release*|'Synchronize common files from prometheus/prometheus'|'[0.'*|'[1.'*)
              exit 0
              ;;
          esac

          echo "PR title must start with a package name or an allowed prefix, optionally followed by a scope"
          echo "Examples: 'logical_disk: description', 'mixin(dashboard): description', 'chore(github-action): description'"
          exit 1
        env:
          PR_TITLE: ${{ github.event.pull_request.title }}