name: Java Implementation Testing (FFM vs JNI)

# Test both FFM and JNI implementations across multiple Java versions
on:
  pull_request:
    branches: [ develop, main ]
    paths:
      - 'java/**'
      - 'CMakeBuildOptions.cmake'
      - 'CMakePresets.json'
      - 'config/cmake-presets/hidden-presets.json'
      - '.github/workflows/java-implementation-test.yml'
      - '.github/scripts/test-java-implementations.sh'
  workflow_call:
    inputs:
      java_versions:
        description: 'Java versions to test (comma-separated)'
        type: string
        required: false
        default: '11,17,21,24'
      test_mode:
        description: 'Test mode (build, maven, full)'
        type: string
        required: false
        default: 'build'
      platforms:
        description: 'Platforms to test'
        type: string
        required: false
        default: 'ubuntu-latest'
  workflow_dispatch:
    inputs:
      java_versions:
        description: 'Java versions to test'
        type: string
        required: false
        default: '11,17,21,24'
      test_mode:
        description: 'Test mode'
        type: choice
        required: false
        default: 'build'
        options:
          - 'build'
          - 'maven'
          - 'full'
      platforms:
        description: 'Platforms to test'
        type: choice
        required: false
        default: 'ubuntu-latest'
        options:
          - 'ubuntu-latest'
          - 'windows-latest'
          - 'macos-latest'
          - 'all-platforms'

permissions:
  contents: read

env:
  CMAKE_GENERATOR: Ninja

jobs:
  setup-matrix:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.generate-matrix.outputs.matrix }}
    steps:
      - name: Generate test matrix
        id: generate-matrix
        env:
          JAVA_VERSIONS: ${{ inputs.java_versions || '11,17,21,25' }}
          PLATFORMS: ${{ inputs.platforms || 'ubuntu-latest' }}
        run: |

          # Expand platforms if needed
          if [[ "$PLATFORMS" == "all-platforms" ]]; then
            PLATFORMS="ubuntu-latest,windows-latest,macos-latest"
          fi

          # Generate matrix
          matrix_json="["
          first_entry=true

          for platform in $(echo "$PLATFORMS" | tr ',' ' '); do
            for java_version in $(echo "$JAVA_VERSIONS" | tr ',' ' '); do
              # Determine available implementations
              if [[ $java_version -ge 25 ]]; then
                implementations="ffm jni"
              else
                implementations="jni"
              fi

              for impl in $implementations; do
                if [ "$first_entry" = true ]; then
                  first_entry=false
                else
                  matrix_json="$matrix_json,"
                fi

                matrix_json="$matrix_json{\"os\":\"$platform\",\"java-version\":\"$java_version\",\"implementation\":\"$impl\"}"
              done
            done
          done

          matrix_json="$matrix_json]"

          echo "Generated matrix:"
          echo "$matrix_json" | jq '.'

          echo "matrix=$matrix_json" >> $GITHUB_OUTPUT

  test-implementations:
    needs: setup-matrix
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        include: ${{ fromJson(needs.setup-matrix.outputs.matrix) }}

    name: Test Java ${{ matrix.java-version }} ${{ matrix.implementation }} on ${{ matrix.os }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          submodules: recursive
          persist-credentials: false

      - name: Set up Java ${{ matrix.java-version }} (${{ matrix.implementation }})
        uses: actions/setup-java@dd06d9cba3e5552c54d9f8ea23572deb30010f7c # v5
        with:
          distribution: ${{ matrix.implementation == 'ffm' && 'oracle' || 'temurin' }}
          java-version: ${{ matrix.implementation == 'ffm' && '25' || matrix.java-version }}

      - name: Setup jextract (FFM builds only)
        if: ${{ matrix.implementation == 'ffm' }}
        uses: ./.github/actions/setup-jextract
        with:
          java-version: '25'

      - name: Setup Build Environment (Linux)
        if: runner.os == 'Linux'
        run: |
          sudo apt-get update
          sudo apt-get install -y ninja-build libaec-dev zlib1g-dev

      - name: Setup Build Environment (macOS)
        if: runner.os == 'macOS'
        run: |
          brew install libaec

      - name: Setup Build Environment (Windows)
        if: runner.os == 'Windows'
        run: |
          choco install ninja

      - name: Cache CMake build
        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6
        with:
          path: |
            build-test-*
          key: ${{ runner.os }}-java${{ matrix.java-version }}-${{ matrix.implementation }}-${{ hashFiles('**/CMakeLists.txt', 'CMakePresets.json') }}
          restore-keys: |
            ${{ runner.os }}-java${{ matrix.java-version }}-${{ matrix.implementation }}-
            ${{ runner.os }}-java${{ matrix.java-version }}-

      - name: Verify Java version and implementation compatibility
        run: |
          java -version
          echo "Testing Java ${{ matrix.java-version }} with ${{ matrix.implementation }} implementation"

          # Additional validation for FFM
          if [[ "${{ matrix.implementation }}" == "ffm" ]]; then
            if [[ ${{ matrix.java-version }} -lt 25 ]]; then
              echo "::error::FFM implementation requires Java 25, got Java ${{ matrix.java-version }}"
              exit 1
            fi
            echo "FFM implementation validated for Java ${{ matrix.java-version }}"
          fi

      - name: Run implementation tests
        shell: bash
        env:
          TEST_MODE: ${{ inputs.test_mode || 'build' }}
        run: |
          chmod +x .github/scripts/test-java-implementations.sh
          .github/scripts/test-java-implementations.sh \
            ${{ matrix.java-version }} \
            ${{ matrix.implementation }} \
            "$TEST_MODE"

      - name: Upload build artifacts on failure
        if: failure()
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v5
        with:
          name: build-logs-${{ matrix.os }}-java${{ matrix.java-version }}-${{ matrix.implementation }}
          path: |
            build-test-*/CMakeCache.txt
            build-test-*/CMakeFiles/CMakeError.log
            build-test-*/CMakeFiles/CMakeOutput.log
          retention-days: 7

      - name: Upload Maven artifacts (if generated)
        if: inputs.test_mode == 'maven' || inputs.test_mode == 'full'
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v5
        with:
          name: maven-artifacts-${{ matrix.os }}-java${{ matrix.java-version }}-${{ matrix.implementation }}
          path: |
            build-test-*/java/**/target/*.jar
            build-test-*/java/**/pom.xml
          retention-days: 3

  validate-artifacts:
    needs: [setup-matrix, test-implementations]
    runs-on: ubuntu-latest
    if: inputs.test_mode == 'maven' || inputs.test_mode == 'full'

    steps:
      - name: Checkout repository
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          persist-credentials: false

      - name: Download all Maven artifacts
        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
        with:
          pattern: maven-artifacts-*
          path: artifacts/

      - name: Validate artifact differentiation
        run: |
          echo "Validating Maven artifact differentiation..."

          # Check for FFM artifacts
          ffm_artifacts=$(find artifacts/ -name "*hdf5-java-ffm*" | wc -l)
          jni_artifacts=$(find artifacts/ -name "*hdf5-java-jni*" | wc -l)

          echo "Found $ffm_artifacts FFM artifacts and $jni_artifacts JNI artifacts"

          if [[ $ffm_artifacts -eq 0 && $jni_artifacts -eq 0 ]]; then
            echo "::error::No Maven artifacts found!"
            exit 1
          fi

          # Verify no mixed artifacts
          mixed_artifacts=$(find artifacts/ -name "*hdf5-java-*" | grep -v -E "(ffm|jni)" | wc -l)
          if [[ $mixed_artifacts -gt 0 ]]; then
            echo "::error::Found artifacts without proper FFM/JNI differentiation"
            find artifacts/ -name "*hdf5-java-*" | grep -v -E "(ffm|jni)"
            exit 1
          fi

          echo "✅ Artifact differentiation validation passed"

      - name: Validate POM files
        run: |
          echo "Validating POM file contents..."

          for pom in $(find artifacts/ -name "pom.xml"); do
            echo "Checking POM: $pom"

            # Extract artifact ID
            artifact_id=$(grep -o '<artifactId>hdf5-java-[^<]*</artifactId>' "$pom" | sed 's/<[^>]*>//g')
            echo "Artifact ID: $artifact_id"

            # Validate implementation metadata
            if grep -q "hdf5-java-ffm" "$pom"; then
              if ! grep -q "FFM" "$pom"; then
                echo "::error::FFM POM missing implementation metadata"
                exit 1
              fi
              echo "✅ FFM POM validation passed"
            elif grep -q "hdf5-java-jni" "$pom"; then
              if ! grep -q "JNI" "$pom"; then
                echo "::error::JNI POM missing implementation metadata"
                exit 1
              fi
              echo "✅ JNI POM validation passed"
            else
              echo "::error::POM has unrecognized artifact ID: $artifact_id"
              exit 1
            fi
          done

  report-results:
    needs: [setup-matrix, test-implementations, validate-artifacts]
    runs-on: ubuntu-latest
    if: always()

    steps:
      - name: Generate test report
        env:
          JAVA_VERSIONS: ${{ inputs.java_versions || '11,17,21,25' }}
          TEST_MODE: ${{ inputs.test_mode || 'build' }}
          PLATFORMS: ${{ inputs.platforms || 'ubuntu-latest' }}
        run: |
          echo "## Java Implementation Test Results" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY

          echo "### Test Configuration" >> $GITHUB_STEP_SUMMARY
          echo "- **Java Versions**: $JAVA_VERSIONS" >> $GITHUB_STEP_SUMMARY
          echo "- **Test Mode**: $TEST_MODE" >> $GITHUB_STEP_SUMMARY
          echo "- **Platforms**: $PLATFORMS" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY

          # Report job statuses
          if [[ "${{ needs.test-implementations.result }}" == "success" ]]; then
            echo "✅ **Implementation Tests**: PASSED" >> $GITHUB_STEP_SUMMARY
          else
            echo "❌ **Implementation Tests**: FAILED" >> $GITHUB_STEP_SUMMARY
          fi

          if [[ "${{ needs.validate-artifacts.result }}" == "success" ]]; then
            echo "✅ **Artifact Validation**: PASSED" >> $GITHUB_STEP_SUMMARY
          elif [[ "${{ needs.validate-artifacts.result }}" == "skipped" ]]; then
            echo "⏭️ **Artifact Validation**: SKIPPED" >> $GITHUB_STEP_SUMMARY
          else
            echo "❌ **Artifact Validation**: FAILED" >> $GITHUB_STEP_SUMMARY
          fi

          echo "" >> $GITHUB_STEP_SUMMARY
          echo "### Implementation Matrix" >> $GITHUB_STEP_SUMMARY
          echo "| Java Version | FFM Support | JNI Support |" >> $GITHUB_STEP_SUMMARY
          echo "|--------------|-------------|-------------|" >> $GITHUB_STEP_SUMMARY
          echo "| 11 | ❌ | ✅ |" >> $GITHUB_STEP_SUMMARY
          echo "| 17 | ❌ | ✅ |" >> $GITHUB_STEP_SUMMARY
          echo "| 21 | ❌ | ✅ |" >> $GITHUB_STEP_SUMMARY
          echo "| 24+ | ✅ (optional) | ✅ (default) |" >> $GITHUB_STEP_SUMMARY