name: Auto Label PR

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

jobs:
  add-automerge-label:
    runs-on: [macos, host]
    steps:
      - name: Add 'automerge' label to PR
        env:
          CI_TOKEN: ${{ secrets.CI_TOKEN }}
          GITEA_BASE_URL: https://gitea.jaybe.dev
          PR_NUMBER: ${{ github.event.pull_request.number }}
          REPO: ${{ github.repository }}
        run: |
          set -euo pipefail
          if [ -z "${CI_TOKEN:-}" ]; then
            echo "CI_TOKEN not set; skipping labeling"; exit 0; fi
          OWNER=$(echo "$REPO" | cut -d'/' -f1)
          NAME=$(echo "$REPO" | cut -d'/' -f2)
          echo "Resolving existing label id for 'automerge' in $OWNER/$NAME (no creation)"
          curl -sS -o /tmp/labels.json -H "Authorization: token ${CI_TOKEN}" \
            "${GITEA_BASE_URL}/api/v1/repos/${OWNER}/${NAME}/labels?limit=1000" || true
          # Extract all ids whose name == automerge, prefer the smallest id (oldest)
          LID=$(tr '\n' ' ' < /tmp/labels.json | \
            grep -o '"id":[0-9][0-9]*[^\}]*"name":"automerge"' | \
            sed -E 's/.*"id":([0-9]+).*/\1/' | sort -n | head -n1 || true)
          if [ -z "${LID:-}" ]; then
            echo "No existing 'automerge' label found; skipping labeling"; exit 0; fi
          echo "Labeling PR #$PR_NUMBER with id $LID"
          curl -sS -X POST \
            -H "Content-Type: application/json" \
            -H "Authorization: token ${CI_TOKEN}" \
            "${GITEA_BASE_URL}/api/v1/repos/${OWNER}/${NAME}/issues/${PR_NUMBER}/labels" \
            -d '{"labels":['"${LID}"']}' || true