name: Backend build, format check, and coverage

# Reusable workflow called from build.yml. Runs the backend build matrix
# (JDK 25 × spring-security on/off), Spotless formatting check, JUnit, and
# posts Jacoco coverage to PRs.
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]
        spring-security: [true, false]
    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: 9.3.1
          cache-disabled: true

      - name: Install Task
        uses: go-task/setup-task@3be4020d41929789a01026e0e427a4321ce0ad44 # v2.0.0
      - name: Check Java formatting (Spotless)
        if: matrix.jdk-version == 25 && matrix.spring-security == false
        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 and spring security ${{ matrix.spring-security }}
        run: task backend:build:ci
        env:
          MAVEN_USER: ${{ secrets.MAVEN_USER }}
          MAVEN_PASSWORD: ${{ secrets.MAVEN_PASSWORD }}
          MAVEN_PUBLIC_URL: ${{ secrets.MAVEN_PUBLIC_URL }}
          DISABLE_ADDITIONAL_FEATURES: ${{ matrix.spring-security }}

      - name: Check Test Reports Exist
        if: always()
        run: |
          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/"
          )
          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-${{ matrix.jdk-version }}-spring-security-${{ matrix.spring-security }}
          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: Add coverage to PR with spring security ${{ matrix.spring-security }} and 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