name: Reusable Security Scan Workflow

on:
  workflow_call:
    inputs:
      scan-type:
        description: 'Type of scan: fs (filesystem), config, or image'
        required: false
        type: string
        default: 'fs'
      severity:
        description: 'Severity levels to report (comma-separated: UNKNOWN,LOW,MEDIUM,HIGH,CRITICAL)'
        required: false
        type: string
        default: 'HIGH,CRITICAL'
      exit-code:
        description: 'Exit code when vulnerabilities found (0=continue, 1=fail)'
        required: false
        type: string
        default: '0'
      upload-to-security-tab:
        description: 'Upload SARIF to GitHub Security tab (GitHub-specific feature)'
        required: false
        type: boolean
        default: true
      scan-path:
        description: 'Path to scan (default: entire repository)'
        required: false
        type: string
        default: '.'
      generate-sbom:
        description: 'Generate Software Bill of Materials (SBOM) in CycloneDX and SPDX formats'
        required: false
        type: boolean
        default: true

jobs:
  security-scan:
    runs-on: ubuntu-latest
    name: Security vulnerability scan
    permissions:
      contents: read
      security-events: write  # Required only for GitHub Security tab upload
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Install Trivy
        run: |
          set -euo pipefail
          curl -fsSL https://aquasecurity.github.io/trivy-repo/deb/public.key \
            | gpg --dearmor \
            | sudo tee /usr/share/keyrings/trivy.gpg > /dev/null
          echo "deb [signed-by=/usr/share/keyrings/trivy.gpg] https://aquasecurity.github.io/trivy-repo/deb $(lsb_release -sc) main" \
            | sudo tee /etc/apt/sources.list.d/trivy.list > /dev/null
          sudo apt-get update
          sudo apt-get install -y trivy

      - name: Run Security Scan using ci_security.sh
        run: |
          set -euo pipefail
          sbom_flag=""
          if [[ "${{ inputs.generate-sbom }}" == "true" ]]; then
            sbom_flag="--generate-sbom"
          fi

          ./scripts/ci_security.sh \
            --scan-type "${{ inputs.scan-type }}" \
            --scan-path "${{ inputs.scan-path }}" \
            --severity "${{ inputs.severity }}" \
            --exit-code "${{ inputs.exit-code }}" \
            ${sbom_flag}
      
      # GitHub-specific: Upload to Security tab
      - name: Upload SARIF to GitHub Security tab
        if: inputs.upload-to-security-tab == true && always()
        uses: github/codeql-action/upload-sarif@v4
        with:
          sarif_file: './generated/reports/trivy-results.sarif'
          category: 'trivy-security-scan'
      
      # Agnostic: Upload all reports as artifacts (works on any CI)
      - name: Upload security reports as artifacts
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: security-scan-reports
          path: |
            ./generated/reports/trivy-results.sarif
            ./generated/reports/trivy-report.json
            ./generated/reports/trivy-report.txt
            ./generated/reports/security-summary.md
            ./generated/reports/trivy-scan.log
          retention-days: 90

      # Display summary in workflow output
      - name: Display Security Summary
        if: always()
        run: |
          cat ./generated/reports/security-summary.md >> $GITHUB_STEP_SUMMARY 2>/dev/null || echo "Summary not available"          

      #
      - name: Upload SBOM reports
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: sbom-reports
          path: |
            ./generated/reports/sbom/
          retention-days: 90          

      # Optional: Fail the build if critical vulnerabilities found
      - name: Check for critical vulnerabilities
        if: inputs.exit-code == '1'
        run: |
          if [ -f ./generated/reports/trivy-results.sarif ]; then
            CRITICAL=$(jq '[.runs[].results[] | select(.level == "error")] | length' ./generated/reports/trivy-results.sarif 2>/dev/null || echo "0")
            if [ "$CRITICAL" -gt 0 ]; then
              echo "❌ Found ${CRITICAL} critical vulnerabilities!"
              echo "Review the security reports in artifacts."
              exit 1
            fi
          fi