name: Backend build, format check, and coverage

# Reusable workflow called from build.yml. Runs the backend build matrix
# (JDK 25 × every flavor), Spotless formatting check, JUnit, and
# posts Jacoco coverage to PRs.
#
# Flavor axis (maps to STIRLING_FLAVOR in settings.gradle):
#   core         - DISABLE_ADDITIONAL_FEATURES=true, no proprietary, no saas
#   proprietary  - default build, no saas
#   saas         - proprietary + the saas subproject (build + JUnit only,
#                  never any runtime/integration testing)
on:
  workflow_call:

permissions:
  contents: read
  actions: read
  security-events: write
  pull-requests: write

jobs:
  pick:
    uses: ./.github/workflows/_runner-pick.yml

  build:
    needs: pick
    runs-on: ${{ needs.pick.outputs.is_fork == 'true' && 'ubuntu-latest' || 'depot-ubuntu-24.04-8' }}
    env:
      DEPOT_TOKEN: ${{ secrets.DEPOT_TOKEN }}
    strategy:
      fail-fast: false
      matrix:
        jdk-version: [25]
        flavor: [core, proprietary, saas]
    steps:
      - name: Harden Runner
        uses: step-security/harden-runner@ab7a9404c0f3da075243ca237b5fac12c98deaa5 # v2.19.3
        with:
          egress-policy: audit
      - name: Checkout repository
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

      - name: Set up JDK ${{ matrix.jdk-version }}
        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5.2.0
        with:
          java-version: ${{ matrix.jdk-version }}
          distribution: "temurin"

      - name: Cache Gradle dependency artifacts
        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
        with:
          path: |
            ~/.gradle/wrapper
            ~/.gradle/caches/modules-2/files-2.1
            ~/.gradle/caches/modules-2/metadata-2.*
          key: gradle-deps-${{ runner.os }}-jdk-${{ matrix.jdk-version }}-${{ hashFiles('**/gradle/wrapper/gradle-wrapper.properties', '**/*.gradle', '**/*.gradle.kts', 'settings.gradle', 'settings.gradle.kts', 'gradle/libs.versions.toml') }}

      - name: Setup Gradle
        uses: gradle/actions/setup-gradle@50e97c2cd7a37755bbfafc9c5b7cafaece252f6e # v6.1.0
        with:
          gradle-version: 9.5.1
          cache-disabled: true

      - name: Install Task
        uses: go-task/setup-task@01a4adf9db2d14c1de7a560f09170b6e0df736aa # v2.1.0
      - name: Check Java formatting (Spotless)
        # Runs once per matrix combination - pick the cheapest leg
        # (core - no proprietary, no saas) so we don't wait for the
        # heavier flavors just to fail formatting.
        if: matrix.jdk-version == 25 && matrix.flavor == 'core'
        id: spotless-check
        run: task backend:format:check
        continue-on-error: true
        env:
          MAVEN_USER: ${{ secrets.MAVEN_USER }}
          MAVEN_PASSWORD: ${{ secrets.MAVEN_PASSWORD }}
          MAVEN_PUBLIC_URL: ${{ secrets.MAVEN_PUBLIC_URL }}

      - name: Comment on backend format check failure
        # Only post a comment on PRs. github-script's PR helpers need an
        # issue/PR number, which doesn't exist on merge_group runs.
        if: steps.spotless-check.outcome == 'failure' && github.event_name == 'pull_request'
        continue-on-error: true
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          script: |
            const marker = '<!-- java-formatting-check -->';
            const body = [
              marker,
              '### Backend Format Check Failed',
              '',
              'There are formatting issues in your Java code that will need to be fixed before they can be merged in.',
              '',
              'Run `task backend:format` to auto-fix, then commit and push the changes.',
            ].join('\n');
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            });
            const existing = comments.find(c => c.body.includes(marker));
            if (existing) {
              await github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: existing.id,
                body,
              });
            } else {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body,
              });
            }

      - name: Fail if backend format check failed
        if: steps.spotless-check.outcome == 'failure'
        run: |
          echo "============================================"
          echo "  Backend Format Check Failed"
          echo "============================================"
          echo ""
          echo "There are formatting issues in your Java code"
          echo "that will need to be fixed before they can be"
          echo "merged in."
          echo ""
          echo "Run 'task backend:format' to auto-fix, then"
          echo "commit and push the changes."
          echo "============================================"
          exit 1

      - name: Remove backend format check comment on success
        if: steps.spotless-check.outcome == 'success' && github.event_name == 'pull_request'
        continue-on-error: true
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          script: |
            const marker = '<!-- java-formatting-check -->';
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            });
            const existing = comments.find(c => c.body.includes(marker));
            if (existing) {
              await github.rest.issues.deleteComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: existing.id,
              });
            }

      - name: Build with Gradle (flavor=${{ matrix.flavor }})
        # STIRLING_FLAVOR is read by settings.gradle and expands into the
        # right combination of DISABLE_ADDITIONAL_FEATURES + ENABLE_SAAS
        # so we don't have to set them by hand. The saas flavor pulls in
        # the app/saas subproject (unit tests only - no runtime tests).
        run: task backend:build:ci
        env:
          MAVEN_USER: ${{ secrets.MAVEN_USER }}
          MAVEN_PASSWORD: ${{ secrets.MAVEN_PASSWORD }}
          MAVEN_PUBLIC_URL: ${{ secrets.MAVEN_PUBLIC_URL }}
          STIRLING_FLAVOR: ${{ matrix.flavor }}

      - name: Check Test Reports Exist
        if: always()
        run: |
          # Common + core + proprietary always build (proprietary is
          # excluded only at runtime, not from the gradle subproject
          # graph). Saas builds add a fourth report dir.
          declare -a dirs=(
            "app/core/build/reports/tests/"
            "app/core/build/test-results/"
            "app/common/build/reports/tests/"
            "app/common/build/test-results/"
            "app/proprietary/build/reports/tests/"
            "app/proprietary/build/test-results/"
          )
          if [ "${{ matrix.flavor }}" = "saas" ]; then
            dirs+=("app/saas/build/reports/tests/" "app/saas/build/test-results/")
          fi
          for dir in "${dirs[@]}"; do
            if [ ! -d "$dir" ]; then
              echo "Missing $dir"
              exit 1
            fi
          done

      - name: Upload Test Reports
        if: always()
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: test-reports-jdk-${{ matrix.jdk-version }}-flavor-${{ matrix.flavor }}
          path: |
            app/**/build/reports/jacoco/test
            app/**/build/reports/tests/
            app/**/build/test-results/
            app/**/build/reports/problems/
            build/reports/problems/
          retention-days: 3
          if-no-files-found: warn

      - name: Install defusedxml for coverage summary
        # coverage-summary.py parses JaCoCo XML through defusedxml to
        # silence security scanners that pattern-match on the stdlib
        # xml.etree.ElementTree.parse call.
        if: always() && matrix.flavor == 'saas'
        run: python -m pip install --quiet defusedxml

      - name: JaCoCo coverage step summary
        # Only the saas leg posts the JUnit summary - it's a strict
        # superset of the core + proprietary legs (same .exec files plus
        # the saas subproject). Posting from all three would mean three
        # near-identical tables crowding out the aggregate report.
        if: always() && matrix.flavor == 'saas'
        run: |
          python scripts/coverage-summary.py \
            --title "Backend JUnit coverage (JDK ${{ matrix.jdk-version }})" \
            --jacoco "common=app/common/build/reports/jacoco/test/jacocoTestReport.xml" \
            --jacoco "core=app/core/build/reports/jacoco/test/jacocoTestReport.xml" \
            --jacoco "proprietary=app/proprietary/build/reports/jacoco/test/jacocoTestReport.xml" \
            --jacoco "saas=app/saas/build/reports/jacoco/test/jacocoTestReport.xml" \
            --github-step-summary

      - name: Upload raw JUnit .exec for aggregate merge
        # Same dedup rationale as the summary step: upload from the saas
        # leg only (the most complete set, includes app/saas/.../test.exec)
        # so the aggregate workflow merges the union rather than three
        # overlapping subsets.
        #
        # Separate artifact from the HTML reports so the aggregate
        # workflow can grab just the .exec files with a name pattern
        # (`jacoco-exec-*`) instead of unpacking the whole test-reports
        # tarball.
        if: always() && matrix.flavor == 'saas'
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: jacoco-exec-junit-jdk-${{ matrix.jdk-version }}
          path: app/*/build/jacoco/*.exec
          retention-days: 7
          if-no-files-found: warn

      - name: Add coverage to PR (flavor=${{ matrix.flavor }}, JDK=${{ matrix.jdk-version }})
        # The action only supports the pull_request event (it posts a PR comment),
        # so skip it for merge_group runs and workflow_dispatch.
        if: github.event_name == 'pull_request'
        id: jacoco
        uses: madrapps/jacoco-report@50d3aff4548aa991e6753342d9ba291084e63848 # v1.7.2
        with:
          paths: |
            ${{ github.workspace }}/**/build/reports/jacoco/test/jacocoTestReport.xml
          token: ${{ secrets.GITHUB_TOKEN }}
          min-coverage-overall: 10
          min-coverage-changed-files: 0
          comment-type: summary