name: PR Labeler

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

permissions:
  contents: read
  pull-requests: write

jobs:
  label:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/labeler@8558fd74291d67161a8a78ce36a881fa63b766a9  # v5
        with:
          sync-labels: true

  missing-tests:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
        with:
          ref: ${{ github.event.pull_request.base.sha }}
      - name: Check for missing tests
        id: check
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          REPO: ${{ github.repository }}
        run: |
          gh api --paginate "repos/${REPO}/pulls/${PR_NUMBER}/files" \
            | python utils/check_test_missing.py
      - name: Add or remove missing-tests label
        if: always()
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          REPO: ${{ github.repository }}
        run: |
          HAS_LABEL=$(gh api "repos/${REPO}/issues/${PR_NUMBER}/labels" --jq 'any(.[]; .name == "missing-tests")')
          if [ "${{ steps.check.outcome }}" = "failure" ]; then
            if [ "$HAS_LABEL" != "true" ]; then
              gh pr edit "$PR_NUMBER" --add-label "missing-tests"
            fi
          else
            if [ "$HAS_LABEL" = "true" ]; then
              gh pr edit "$PR_NUMBER" --remove-label "missing-tests" 2>/dev/null || true
            fi
          fi

  fixes-issue:
    runs-on: ubuntu-latest
    steps:
      - name: Check for linked closing issues
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          REPO: ${{ github.repository }}
        run: |
          OWNER="${REPO%/*}"
          NAME="${REPO#*/}"
          COUNT=$(gh api graphql \
            -F owner="$OWNER" -F name="$NAME" -F number="$PR_NUMBER" \
            -f query='
              query($owner: String!, $name: String!, $number: Int!) {
                repository(owner: $owner, name: $name) {
                  pullRequest(number: $number) {
                    closingIssuesReferences(first: 1) {
                      totalCount
                    }
                  }
                }
              }' \
            --jq '.data.repository.pullRequest.closingIssuesReferences.totalCount')
          HAS_LABEL=$(gh api "repos/${REPO}/issues/${PR_NUMBER}/labels" --jq 'any(.[]; .name == "fixes-issue")')
          if [ "${COUNT:-0}" -gt 0 ]; then
            if [ "$HAS_LABEL" != "true" ]; then
              gh pr edit "$PR_NUMBER" --repo "$REPO" --add-label "fixes-issue"
            fi
          else
            if [ "$HAS_LABEL" = "true" ]; then
              gh pr edit "$PR_NUMBER" --repo "$REPO" --remove-label "fixes-issue" 2>/dev/null || true
            fi
          fi

  size-label:
    runs-on: ubuntu-latest
    steps:
      - name: Label PR by diff size
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          REPO: ${{ github.repository }}
        run: |
          DIFF_SIZE=$(gh api "repos/${REPO}/pulls/${PR_NUMBER}" --jq '.additions + .deletions')
          if [ "$DIFF_SIZE" -lt 50 ]; then
            CANDIDATE_LABEL="size/S"
          elif [ "$DIFF_SIZE" -lt 200 ]; then
            CANDIDATE_LABEL="size/M"
          else
            CANDIDATE_LABEL="size/L"
          fi
          CURRENT_LABELS=$(gh api "repos/${REPO}/issues/${PR_NUMBER}/labels" --jq '.[].name')
          for label in size/S size/M size/L; do
            if [ "$label" != "$CANDIDATE_LABEL" ] && echo "$CURRENT_LABELS" | grep -qx "$label"; then
              gh pr edit "$PR_NUMBER" --repo "$REPO" --remove-label "$label" 2>/dev/null || true
            fi
          done
          if ! echo "$CURRENT_LABELS" | grep -qx "$CANDIDATE_LABEL"; then
            gh pr edit "$PR_NUMBER" --repo "$REPO" --add-label "$CANDIDATE_LABEL"
          fi