name: Mutation testing

on:
  schedule:
    # Run the complete enabled module set once a week from one source revision.
    - cron: '0 5 * * 0'
  workflow_dispatch:

permissions:
  contents: read

concurrency:
  group: mutation-testing
  cancel-in-progress: false

jobs:
  plan:
    name: Plan mutation modules
    runs-on: ubuntu-latest
    timeout-minutes: 5
    outputs:
      matrix: ${{ steps.matrix.outputs.matrix }}

    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1

      - name: Validate mutation testing configuration
        run: python .github/scripts/test_mutation_testing.py

      - name: Create module matrix
        id: matrix
        run: |
          matrix=$(python .github/scripts/mutation_testing.py matrix \
            --manifest eng/mutation-testing/modules.json \
            --repository-root "$GITHUB_WORKSPACE")
          echo "matrix=$matrix" >> "$GITHUB_OUTPUT"

  stryker:
    name: Mutate ${{ matrix.displayName }}
    needs: plan
    runs-on: ubuntu-latest
    timeout-minutes: ${{ matrix.timeoutMinutes }}
    env:
      DOTNET_CLI_TELEMETRY_OPTOUT: 1
      MutationTesting: true
    strategy:
      fail-fast: false
      max-parallel: 6
      matrix: ${{ fromJSON(needs.plan.outputs.matrix) }}

    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1

      - name: Create isolated mutation solution
        run: |
          python .github/scripts/mutation_testing.py create-solution \
            --manifest eng/mutation-testing/modules.json \
            --module "${{ matrix.id }}" \
            --output MutationTesting.generated.slnx

      - name: Build mutation shard
        id: build
        continue-on-error: true
        run: |
          set -o pipefail
          output="$GITHUB_WORKSPACE/artifacts/mutation-testing/${{ matrix.id }}"
          mkdir -p "$output"
          ./build.sh --binaryLog --projects "$GITHUB_WORKSPACE/MutationTesting.generated.slnx" \
            2>&1 | tee "$output/build-console.log"

      - name: Install Stryker.NET
        id: install
        if: ${{ steps.build.outcome == 'success' }}
        run: |
          stryker_version=$(sed -n 's/^[[:space:]]*"version":[[:space:]]*"\([^"]*\)".*/\1/p' .config/stryker/dotnet-tools.json)
          test -n "$stryker_version"
          ./.dotnet/dotnet tool install dotnet-stryker --tool-path artifacts/tools/stryker --version "$stryker_version" --configfile .config/stryker/NuGet.config

      - name: Run mutation tests
        id: mutate
        if: ${{ success() && steps.build.outcome == 'success' }}
        run: |
          set -u
          export DOTNET_ROOT="$GITHUB_WORKSPACE/.dotnet"
          export PATH="$DOTNET_ROOT:$PATH"
          output="$GITHUB_WORKSPACE/artifacts/mutation-testing/${{ matrix.id }}"
          mkdir -p "$output"
          start_time=$(date +%s)

          set +e
          set -o pipefail
          "$GITHUB_WORKSPACE/artifacts/tools/stryker/dotnet-stryker" \
            --config-file "$GITHUB_WORKSPACE/stryker-config.json" \
            --solution "$GITHUB_WORKSPACE/MutationTesting.generated.slnx" \
            --project "$(basename "${{ matrix.project }}")" \
            --target-framework net8.0 \
            --output "$output" \
            --skip-version-check \
            2>&1 | tee "$output/stryker-console.log"
          stryker_exit_code=${PIPESTATUS[0]}
          set +o pipefail
          set -e

          duration_seconds=$(( $(date +%s) - start_time ))
          python .github/scripts/mutation_testing.py record-module \
            --manifest eng/mutation-testing/modules.json \
            --module "${{ matrix.id }}" \
            --artifact-dir "$output" \
            --source-commit "$GITHUB_SHA" \
            --exit-code "$stryker_exit_code" \
            --duration-seconds "$duration_seconds"

      - name: Summarize mutation testing results
        if: ${{ always() }}
        env:
          BUILD_OUTCOME: ${{ steps.build.outcome }}
          INSTALL_OUTCOME: ${{ steps.install.outcome }}
          MUTATE_OUTCOME: ${{ steps.mutate.outcome }}
        run: |
          set -euo pipefail
          output="$GITHUB_WORKSPACE/artifacts/mutation-testing/${{ matrix.id }}"
          if [ ! -f "$output/module-result.json" ]; then
            python .github/scripts/mutation_testing.py record-module \
              --manifest eng/mutation-testing/modules.json \
              --module "${{ matrix.id }}" \
              --artifact-dir "$output" \
              --source-commit "$GITHUB_SHA" \
              --exit-code 1 \
              --duration-seconds 0 \
              --failure-reason "Mutation execution did not complete (build: $BUILD_OUTCOME; tool: $INSTALL_OUTCOME; mutation: $MUTATE_OUTCOME)."
          fi
          summary="$GITHUB_WORKSPACE/artifacts/mutation-testing/${{ matrix.id }}/module-summary.md"
          cat "$summary" >> "$GITHUB_STEP_SUMMARY"

      - name: Upload module report
        if: ${{ always() }}
        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
        with:
          name: mutation-testing-module-${{ matrix.id }}
          path: artifacts/mutation-testing/${{ matrix.id }}/
          if-no-files-found: error
          retention-days: 30

      - name: Fail unsuccessful mutation module
        if: ${{ always() }}
        run: |
          python .github/scripts/mutation_testing.py check-module \
            --result "artifacts/mutation-testing/${{ matrix.id }}/module-result.json"

  aggregate:
    name: Aggregate mutation report
    if: ${{ always() && needs.plan.result == 'success' }}
    needs:
      - plan
      - stryker
    runs-on: ubuntu-latest
    timeout-minutes: 15

    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1

      - name: Download module reports
        uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
        with:
          pattern: mutation-testing-module-*
          path: artifacts/mutation-testing-modules

      - name: Aggregate module reports
        if: ${{ always() }}
        run: |
          set +e
          python .github/scripts/mutation_testing.py aggregate \
            --manifest eng/mutation-testing/modules.json \
            --artifacts-dir artifacts/mutation-testing-modules \
            --output-dir artifacts/mutation-testing-full \
            --source-commit "$GITHUB_SHA"
          aggregate_exit_code=$?
          echo "AGGREGATE_EXIT_CODE=$aggregate_exit_code" >> "$GITHUB_ENV"
          exit 0

      - name: Publish aggregate summary
        if: ${{ always() }}
        run: cat artifacts/mutation-testing-full/summary.md >> "$GITHUB_STEP_SUMMARY"

      - name: Upload full mutation report
        if: ${{ always() }}
        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
        with:
          name: mutation-testing-full-report
          path: artifacts/mutation-testing-full/
          if-no-files-found: error
          retention-days: 90

      # Preserve the artifact contract consumed by mutation-test-improver while it
      # remains focused on the original ServerMode client module.
      - name: Upload Mutation Test Improver report
        if: ${{ always() && hashFiles('artifacts/mutation-testing-full/modules/server-mode-client/reports/mutation-report.json') != '' }}
        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
        with:
          name: mutation-testing-report
          path: artifacts/mutation-testing-full/modules/server-mode-client/
          if-no-files-found: error
          retention-days: 30

      - name: Fail partial aggregate
        if: ${{ always() }}
        run: exit "$AGGREGATE_EXIT_CODE"