coverage.yml

name: Code Coverage

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

env:
  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
  DOTNET_CLI_TELEMETRY_OPTOUT: true
  DOTNET_NOLOGO: true

jobs:
  coverage:
    name: Coverage Report
    runs-on: ubuntu-latest

    permissions:
      contents: read
      pull-requests: write

    steps:
      - name: Checkout
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Setup .NET
        uses: actions/setup-dotnet@v5
        with:
          dotnet-version: '10.0.x'

      - name: Restore NuGet cache
        uses: actions/cache/restore@v5
        with:
          path: ~/.nuget/packages
          key: ${{ runner.os }}-nuget-${{ hashFiles('**/*.csproj', '**/Directory.*.props') }}
          restore-keys: |
            ${{ runner.os }}-nuget-

      - name: Restore dependencies
        run: dotnet restore

      - name: Build
        run: dotnet build --no-restore -c Release

      - name: Run tests with coverage
        run: |
          dotnet test Kuestenlogik.Surgewave.slnx -c Release --no-build \
            --collect:"XPlat Code Coverage" \
            --results-directory artifacts/coverage/raw \
            --settings coverlet.runsettings \
            --filter "FullyQualifiedName!~IntegrationTests" \
            --verbosity minimal

      - name: Generate coverage report
        uses: danielpalme/ReportGenerator-GitHub-Action@5
        with:
          reports: 'artifacts/coverage/raw/**/coverage.cobertura.xml'
          targetdir: 'artifacts/coverage/report'
          reporttypes: 'Html;Badges;TextSummary;MarkdownSummaryGithub'
          assemblyfilters: '+Kuestenlogik.Surgewave.*;-*.Tests;-*.Benchmarks'
          classfilters: '-*.Program;-*.Startup'

      - name: Print coverage summary
        if: always()
        run: |
          if [ -f "artifacts/coverage/report/Summary.txt" ]; then
            echo "## Coverage Summary"
            cat artifacts/coverage/report/Summary.txt
          fi

      # Enforce a coverage floor on the whole solution. The Plugins subsystem
      # sits much higher (Plugins-Base ~50 %, Packaging ~89 %, Repository
      # ~78 %), but the broker / streams / clustering / connect codebases
      # pull the cross-solution numbers down to roughly 30 % line / 30 %
      # branch. The thresholds below are set just under that floor so a
      # regression of more than a few points fails CI; raising them is a
      # follow-on coverage-push project.
      - name: Enforce coverage thresholds
        if: always()
        run: |
          set -euo pipefail
          SUMMARY=artifacts/coverage/report/Summary.txt
          if [ ! -f "$SUMMARY" ]; then
            echo "::error::Coverage summary not found at $SUMMARY — did ReportGenerator run?"
            exit 1
          fi
          LINE=$(grep -E '^\s*Line coverage:' "$SUMMARY" | head -1 | grep -oE '[0-9]+(\.[0-9]+)?' | head -1)
          BRANCH=$(grep -E '^\s*Branch coverage:' "$SUMMARY" | head -1 | grep -oE '[0-9]+(\.[0-9]+)?' | head -1)
          if [ -z "$LINE" ] || [ -z "$BRANCH" ]; then
            echo "::error::Could not parse Line/Branch percentages from $SUMMARY"
            cat "$SUMMARY"
            exit 1
          fi
          MIN_LINE=30
          MIN_BRANCH=28
          echo "Line coverage:   ${LINE}% (min ${MIN_LINE}%)"
          echo "Branch coverage: ${BRANCH}% (min ${MIN_BRANCH}%)"
          # awk for float comparison — bash's [[ ]] can't compare decimals.
          BAD=0
          if awk "BEGIN { exit !($LINE < $MIN_LINE) }"; then
            echo "::error::Line coverage ${LINE}% is below the ${MIN_LINE}% threshold."
            BAD=1
          fi
          if awk "BEGIN { exit !($BRANCH < $MIN_BRANCH) }"; then
            echo "::error::Branch coverage ${BRANCH}% is below the ${MIN_BRANCH}% threshold."
            BAD=1
          fi
          if [ "$BAD" -eq 1 ]; then exit 1; fi
          echo "OK — both thresholds met."

      - name: Upload coverage report
        uses: actions/upload-artifact@v7
        if: always()
        with:
          name: coverage-report
          path: artifacts/coverage/report/
          retention-days: 30

      - name: Upload coverage badges
        uses: actions/upload-artifact@v7
        if: github.ref == 'refs/heads/main'
        with:
          name: coverage-badges
          path: |
            artifacts/coverage/report/badge_combined.svg
            artifacts/coverage/report/badge_linecoverage.svg
            artifacts/coverage/report/badge_branchcoverage.svg
            artifacts/coverage/report/badge_methodcoverage.svg
          retention-days: 90

      - name: Add coverage to PR comment
        if: github.event_name == 'pull_request'
        uses: marocchino/sticky-pull-request-comment@v3
        with:
          header: coverage
          path: artifacts/coverage/report/SummaryGithub.md