name: WebDAV Stress Tests

on:
  push:
    branches:
      - master
      - main
    paths:
      - 'src/services/webdav/**'
      - 'src/routes/webdav/**'
      - 'src/webdav_xml_parser.rs'
      - 'tests/stress/**'
      - '.github/workflows/webdav-stress-test.yml'
  pull_request:
    branches:
      - master
      - main
    paths:
      - 'src/services/webdav/**'
      - 'src/routes/webdav/**'
      - 'src/webdav_xml_parser.rs'
      - 'tests/stress/**'
      - '.github/workflows/webdav-stress-test.yml'
  schedule:
    # Run stress tests daily at 2 AM UTC
    - cron: '0 2 * * *'
  workflow_dispatch:
    inputs:
      stress_level:
        description: 'Stress test intensity level'
        required: true
        default: 'medium'
        type: choice
        options:
        - light
        - medium
        - heavy
        - extreme
      timeout_minutes:
        description: 'Test timeout in minutes'
        required: false
        default: '30'
        type: string

env:
  CARGO_TERM_COLOR: always
  RUST_LOG: debug,webdav_stress=trace
  RUST_BACKTRACE: full
  DATABASE_URL: postgresql://readur_test:readur_test@localhost:5433/readur_test

jobs:
  webdav-stress-tests:
    name: WebDAV Stress Testing
    runs-on: ubuntu-latest
    timeout-minutes: ${{ fromJson(github.event.inputs.timeout_minutes || '45') }}

    services:
      postgres:
        image: postgres:17-alpine
        credentials:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
        env:
          POSTGRES_USER: readur_test
          POSTGRES_PASSWORD: readur_test
          POSTGRES_DB: readur_test
        ports:
          - 5433:5432
        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
          --tmpfs /var/lib/postgresql/data:rw,noexec,nosuid,size=512m

    steps:
      - name: Free disk space
        run: |
          echo "=== Initial disk usage ==="
          df -h
          
          # Remove unnecessary packages to free up space
          sudo rm -rf /usr/share/dotnet
          sudo rm -rf /opt/ghc
          sudo rm -rf "/usr/local/share/boost"
          sudo rm -rf "$AGENT_TOOLSDIRECTORY"
          sudo rm -rf /usr/local/lib/android
          sudo rm -rf /opt/hostedtoolcache/CodeQL
          sudo rm -rf /usr/share/swift
          sudo apt-get clean
          sudo docker system prune -af --volumes
          
          # Set up efficient temp directories
          echo "TMPDIR=${{ runner.temp }}" >> $GITHUB_ENV
          echo "WEBDAV_TEST_ROOT=${{ runner.temp }}/webdav-stress" >> $GITHUB_ENV
          mkdir -p ${{ runner.temp }}/webdav-stress
          
          echo "=== Disk usage after cleanup ==="
          df -h

      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Checkout code
        uses: actions/checkout@v5

      - name: Setup Rust
        uses: dtolnay/rust-toolchain@stable
        with:
          components: rustfmt, clippy

      - name: Cache cargo registry
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
          key: ${{ runner.os }}-cargo-stress-${{ hashFiles('**/Cargo.lock') }}
          restore-keys: |
            ${{ runner.os }}-cargo-stress-

      - name: Cache target directory  
        uses: actions/cache@v4
        with:
          path: target
          key: ${{ runner.os }}-cargo-target-stress-${{ hashFiles('**/Cargo.lock') }}-${{ hashFiles('**/*.rs') }}
          restore-keys: |
            ${{ runner.os }}-cargo-target-stress-${{ hashFiles('**/Cargo.lock') }}-
            ${{ runner.os }}-cargo-target-stress-

      - name: Setup Dufs WebDAV server
        run: |
          # Install Dufs (Rust-based WebDAV server)
          cargo install dufs --features webdav
          
          # Create WebDAV test directory structure
          mkdir -p ${{ env.WEBDAV_TEST_ROOT }}/webdav-server
          
          # Start Dufs server in background
          dufs ${{ env.WEBDAV_TEST_ROOT }}/webdav-server \
            --bind 0.0.0.0:8080 \
            --enable-cors \
            --allow-all \
            --auth ${{ secrets.WEBDAV_TEST_USERNAME || 'testuser' }}:${{ secrets.WEBDAV_TEST_PASSWORD || 'securepassword123' }} \
            --log-level debug > dufs.log 2>&1 &
          
          echo $! > dufs.pid
          echo "DUFS_PID=$(cat dufs.pid)" >> $GITHUB_ENV
          
          # Store credentials in environment for reuse
          echo "WEBDAV_TEST_USERNAME=${{ secrets.WEBDAV_TEST_USERNAME || 'testuser' }}" >> $GITHUB_ENV
          echo "WEBDAV_TEST_PASSWORD=${{ secrets.WEBDAV_TEST_PASSWORD || 'securepassword123' }}" >> $GITHUB_ENV
          
          # Wait for server to start with exponential backoff
          attempt=1
          max_attempts=30
          base_delay=1
          
          while [ $attempt -le $max_attempts ]; do
            if curl -f "http://${{ secrets.WEBDAV_TEST_USERNAME || 'testuser' }}:${{ secrets.WEBDAV_TEST_PASSWORD || 'securepassword123' }}@localhost:8080/" > /dev/null 2>&1; then
              echo "Dufs WebDAV server is ready after $attempt attempts"
              break
            fi
            
            # Exponential backoff with jitter
            delay=$(( base_delay * attempt + RANDOM % 3 ))
            echo "Waiting for Dufs server... (attempt $attempt/$max_attempts, delay ${delay}s)"
            sleep $delay
            attempt=$(( attempt + 1 ))
          done
          
          # Verify server with proper credentials
          if ! curl -f "http://${{ secrets.WEBDAV_TEST_USERNAME || 'testuser' }}:${{ secrets.WEBDAV_TEST_PASSWORD || 'securepassword123' }}@localhost:8080/" > /dev/null 2>&1; then
            echo "ERROR: Dufs server failed to start!"
            cat dufs.log
            exit 1
          fi
          
          echo "WebDAV server ready at http://localhost:8080"

      - name: Generate complex test data structures
        run: |
          chmod +x scripts/generate-webdav-test-data.sh
          ./scripts/generate-webdav-test-data.sh \
            --webdav-root "${{ env.WEBDAV_TEST_ROOT }}/webdav-server" \
            --stress-level "${{ github.event.inputs.stress_level || 'medium' }}" \
            --include-git-repos \
            --include-permission-issues \
            --include-symlinks \
            --include-large-directories \
            --include-unicode-names \
            --include-problematic-files
        env:
          STRESS_LEVEL: ${{ github.event.inputs.stress_level || 'medium' }}

      - name: Build readur with stress testing features
        run: |
          cargo build --release --features stress-testing

      - name: Start readur server for stress testing
        run: |
          # Set up directories
          mkdir -p uploads watch stress-test-logs
          
          # Start server with stress testing configuration
          ./target/release/readur > readur-stress.log 2>&1 &
          echo $! > readur.pid
          echo "READUR_PID=$(cat readur.pid)" >> $GITHUB_ENV
          
          # Wait for readur to start
          for i in {1..30}; do
            if curl -f http://localhost:8000/api/health > /dev/null 2>&1; then
              echo "Readur server is ready for stress testing"
              break
            fi
            echo "Waiting for readur server... ($i/30)"
            sleep 2
          done
          
          if ! curl -f http://localhost:8000/api/health > /dev/null 2>&1; then
            echo "ERROR: Readur server failed to start!"
            cat readur-stress.log
            exit 1
          fi
        env:
          DATABASE_URL: ${{ env.DATABASE_URL }}
          JWT_SECRET: stress-test-secret
          SERVER_ADDRESS: 0.0.0.0:8000
          UPLOAD_PATH: ./uploads
          WATCH_FOLDER: ./watch
          RUST_LOG: debug,webdav=trace
          WEBDAV_STRESS_TESTING: "true"
          WEBDAV_LOOP_DETECTION_ENABLED: "true"
          WEBDAV_MAX_SCAN_DEPTH: "50"
          WEBDAV_SCAN_TIMEOUT_SECONDS: "300"

      - name: Run WebDAV infinite loop detection tests
        id: loop_detection
        run: |
          echo "=== Starting WebDAV Loop Detection Stress Tests ==="
          
          # Run the stress tests with loop monitoring
          timeout 1800s cargo test --release --test webdav_stress_tests \
            --features stress-testing -- \
            --test-threads=4 \
            --nocapture \
            test_infinite_loop_detection || test_exit_code=$?
          
          # Check if tests passed or timed out due to infinite loops
          if [ "${test_exit_code:-0}" -eq 124 ]; then
            echo "::error::Tests timed out - possible infinite loop detected!"
            echo "INFINITE_LOOP_DETECTED=true" >> $GITHUB_ENV
            exit 1
          elif [ "${test_exit_code:-0}" -ne 0 ]; then
            echo "::error::Stress tests failed with exit code: ${test_exit_code}"
            exit $test_exit_code
          fi
          
          echo "Loop detection tests completed successfully"
        env:
          WEBDAV_SERVER_URL: http://localhost:8080
          WEBDAV_USERNAME: ${{ secrets.WEBDAV_TEST_USERNAME || 'testuser' }}
          WEBDAV_PASSWORD: ${{ secrets.WEBDAV_TEST_PASSWORD || 'securepassword123' }}
          STRESS_LEVEL: ${{ github.event.inputs.stress_level || 'medium' }}
          TEST_TIMEOUT_SECONDS: 1800

      - name: Run WebDAV directory scanning stress tests
        run: |
          echo "=== Starting Directory Scanning Stress Tests ==="
          
          cargo test --release --test webdav_stress_tests \
            --features stress-testing -- \
            --test-threads=2 \
            --nocapture \
            test_directory_scanning_stress
        env:
          WEBDAV_SERVER_URL: http://localhost:8080
          WEBDAV_USERNAME: ${{ secrets.WEBDAV_TEST_USERNAME || 'testuser' }}
          WEBDAV_PASSWORD: ${{ secrets.WEBDAV_TEST_PASSWORD || 'securepassword123' }}

      - name: Run WebDAV concurrent access stress tests
        run: |
          echo "=== Starting Concurrent Access Stress Tests ==="
          
          cargo test --release --test webdav_stress_tests \
            --features stress-testing -- \
            --test-threads=8 \
            --nocapture \
            test_concurrent_webdav_access
        env:
          WEBDAV_SERVER_URL: http://localhost:8080
          WEBDAV_USERNAME: ${{ secrets.WEBDAV_TEST_USERNAME || 'testuser' }}
          WEBDAV_PASSWORD: ${{ secrets.WEBDAV_TEST_PASSWORD || 'securepassword123' }}

      - name: Run WebDAV edge case handling tests
        run: |
          echo "=== Starting Edge Case Handling Tests ==="
          
          cargo test --release --test webdav_stress_tests \
            --features stress-testing -- \
            --test-threads=2 \
            --nocapture \
            test_edge_case_handling
        env:
          WEBDAV_SERVER_URL: http://localhost:8080
          WEBDAV_USERNAME: ${{ secrets.WEBDAV_TEST_USERNAME || 'testuser' }}
          WEBDAV_PASSWORD: ${{ secrets.WEBDAV_TEST_PASSWORD || 'securepassword123' }}

      - name: Analyze WebDAV performance metrics
        if: always()
        run: |
          echo "=== WebDAV Performance Analysis ==="
          
          # Run performance analysis
          if [ -f "stress-test-metrics.json" ]; then
            cargo run --release --bin analyze-webdav-performance -- \
              --metrics-file stress-test-metrics.json \
              --output-format github-summary
          fi
          
          # Generate summary report
          echo "## WebDAV Stress Test Summary" >> $GITHUB_STEP_SUMMARY
          echo "- **Stress Level**: ${{ github.event.inputs.stress_level || 'medium' }}" >> $GITHUB_STEP_SUMMARY
          echo "- **Test Duration**: $(date -d @$SECONDS -u +%H:%M:%S)" >> $GITHUB_STEP_SUMMARY
          echo "- **Infinite Loop Detection**: ${INFINITE_LOOP_DETECTED:-false}" >> $GITHUB_STEP_SUMMARY
          
          if [ -f "webdav-performance-report.md" ]; then
            cat webdav-performance-report.md >> $GITHUB_STEP_SUMMARY
          fi

      - name: Collect and analyze logs
        if: always()
        run: |
          echo "=== Collecting logs for analysis ==="
          
          # Create logs directory
          mkdir -p stress-test-artifacts/logs
          
          # Collect all relevant logs
          cp readur-stress.log stress-test-artifacts/logs/ || echo "No readur log"
          cp dufs.log stress-test-artifacts/logs/ || echo "No dufs log"
          
          # Analyze logs for loop patterns
          if [ -f scripts/analyze-webdav-loops.py ]; then
            python3 scripts/analyze-webdav-loops.py \
              --log-file stress-test-artifacts/logs/readur-stress.log \
              --output stress-test-artifacts/loop-analysis.json
          fi
          
          # Check for problematic patterns
          echo "=== Log Analysis Results ==="
          if grep -q "already scanned directory" stress-test-artifacts/logs/readur-stress.log 2>/dev/null; then
            echo "::warning::Detected repeated directory scanning patterns"
          fi
          
          if grep -q "timeout" stress-test-artifacts/logs/readur-stress.log 2>/dev/null; then
            echo "::warning::Detected timeout issues during WebDAV operations"
          fi

      - name: Upload stress test artifacts
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: webdav-stress-test-artifacts-${{ github.run_id }}
          path: |
            stress-test-artifacts/
            stress-test-metrics.json
            webdav-performance-report.md
          retention-days: 30

      - name: Report critical issues
        if: failure() && env.INFINITE_LOOP_DETECTED == 'true'
        run: |
          echo "::error title=Infinite Loop Detected::WebDAV sync entered an infinite loop during stress testing"
          echo "::error::Check the uploaded artifacts for detailed analysis"
          
          # Create GitHub issue for infinite loop detection
          if [ "${{ github.event_name }}" = "schedule" ] || [ "${{ github.event_name }}" = "push" ]; then
            echo "This would create a GitHub issue for infinite loop detection"
          fi

      - name: Cleanup
        if: always()
        run: |
          # Stop servers
          if [ -n "$READUR_PID" ] && kill -0 $READUR_PID 2>/dev/null; then
            kill $READUR_PID || true
          fi
          
          if [ -n "$DUFS_PID" ] && kill -0 $DUFS_PID 2>/dev/null; then
            kill $DUFS_PID || true
          fi
          
          # Clean up temp files
          rm -rf ${{ env.WEBDAV_TEST_ROOT }} || true
          
          echo "=== Final disk usage ==="
          df -h