name: Pull Request Build

on:
  pull_request:

permissions:
  contents: write
  pull-requests: write

jobs:
  build:
    name: Build
    runs-on: ubuntu-latest
    steps:
      - name: Checkout sources
        uses: actions/checkout@v6
        with:
          fetch-depth: 0
      - name: Setup build
        uses: ./.gitea/actions/setup-build
        with:
          maven-credentials: ${{ secrets.SW_MAVEN_CREDENTIALS }}
      - name: Determine affected projects
        id: affected
        shell: bash
        run: |
          set -euo pipefail

          base_branch="$(jq -r '.pull_request.base.ref' "$GITHUB_EVENT_PATH")"
          base="$(git merge-base "origin/${base_branch}" HEAD || true)"
          bash .gitea/scripts/affected-projects.sh .ci "$base"
      - name: Build with Gradle
        if: steps.affected.outputs.tasks != ''
        shell: bash
        env:
          TASKS: ${{ steps.affected.outputs.tasks }}
        run: |
          set -euo pipefail

          read -ra tasks <<< "$TASKS"
          ./gradlew "${tasks[@]}" --no-daemon

      - name: Merge successful backport PR
        shell: bash
        env:
          GITHUB_TOKEN: ${{ secrets.CI_BOT_TOKEN }}
          BACKPORT_BRANCH_PREFIX: backport/commoncore
        run: |
          set -euo pipefail

          head_branch="$(jq -r '.pull_request.head.ref // ""' "$GITHUB_EVENT_PATH")"
          base_branch="$(jq -r '.pull_request.base.ref // ""' "$GITHUB_EVENT_PATH")"
          pr_number="$(jq -r '.pull_request.number' "$GITHUB_EVENT_PATH")"

          if [[ "${head_branch}" != "${BACKPORT_BRANCH_PREFIX}/"* ]]; then
            echo "Not a CommonCore backport PR."
            exit 0
          fi

          if [[ "${base_branch}" != version/* ]]; then
            echo "Backport PR target is not a version/* branch."
            exit 0
          fi

          api_url="${GITHUB_API_URL:-${GITHUB_SERVER_URL}/api/v1}"

          curl -fsS -X POST \
            -H "Accept: application/json" \
            -H "Authorization: token ${GITHUB_TOKEN}" \
            -H "Content-Type: application/json" \
            -d '{"Do":"merge","delete_branch_after_merge":true}' \
            "${api_url}/repos/${GITHUB_REPOSITORY}/pulls/${pr_number}/merge"