name: Security Audit

on:
  push:
    branches:
      - main
      - 'feat/**'
  pull_request:
    branches:
      - main
  schedule:
    # Weekly full scan — catches new CVEs in existing deps
    - cron: '0 6 * * 1'
  workflow_dispatch:

permissions:
  contents: read
  pull-requests: write
  security-events: write

jobs:

  # ─────────────────────────────────────────────────────────────────────────
  # SAST — Static Application Security Testing
  # ─────────────────────────────────────────────────────────────────────────
  sast:
    name: Static Analysis (bandit + semgrep)
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-python@v5
        with:
          python-version: '3.11'

      - name: Install SAST tools
        run: pip install bandit==1.8.3 semgrep

      # Bandit — Python-specific security linter
      # --exit-zero: findings are warnings, not CI blockers.
      # The security-report job interprets severity.
      - name: Run bandit
        run: |
          bandit -r src/ web_interface/ \
            -c bandit.yaml \
            -f json \
            -o bandit-results.json \
            --exit-zero

      # Semgrep — broader pattern-based analysis
      # || true: prevents network/rate-limit errors from blocking the workflow
      - name: Run semgrep
        run: |
          semgrep --config "p/python" \
            --config "p/flask" \
            --json \
            --output semgrep-results.json \
            src/ web_interface/ \
            || true

      - name: Upload SAST artifacts
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: sast-results
          path: |
            bandit-results.json
            semgrep-results.json
          retention-days: 30


  # ─────────────────────────────────────────────────────────────────────────
  # Dependency Vulnerability Scanning
  # ─────────────────────────────────────────────────────────────────────────
  dependency-audit:
    name: Dependency Audit (pip-audit + safety)
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-python@v5
        with:
          python-version: '3.11'

      - name: Install audit tools
        run: pip install pip-audit safety

      # Install project deps. Hardware-specific packages (rgbmatrix) will fail
      # to build on Ubuntu runners — || true handles this gracefully.
      # pip-audit operates on installed packages; partial install is acceptable.
      - name: Install project dependencies
        run: |
          pip install -r requirements.txt || true
          pip install -r web_interface/requirements.txt || true
          pip install -r requirements-emulator.txt || true

      - name: Run pip-audit
        run: |
          pip-audit --format json --output pip-audit-results.json || true

      - name: Run safety check
        run: |
          safety check --output json > safety-results.json 2>&1 || true

      - name: Upload dependency audit artifacts
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: dependency-audit-results
          path: |
            pip-audit-results.json
            safety-results.json
          retention-days: 30


  # ─────────────────────────────────────────────────────────────────────────
  # Secrets Detection
  # ─────────────────────────────────────────────────────────────────────────
  secrets-scan:
    name: Secrets Scan (gitleaks)
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0  # Full history for scanning all commits

      # continue-on-error: config/config_secrets.template.json contains
      # placeholder strings (YOUR_*) that may trigger gitleaks rules.
      # The generate_report.py script suppresses these false positives.
      - name: Run gitleaks
        uses: gitleaks/gitleaks-action@v2
        continue-on-error: true
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Upload secrets scan artifacts
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: secrets-scan-results
          path: results.sarif
          retention-days: 30


  # ─────────────────────────────────────────────────────────────────────────
  # LEDMatrix-Specific Security Proofs
  # ─────────────────────────────────────────────────────────────────────────
  ledmatrix-security-proofs:
    name: LEDMatrix Security Proofs
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-python@v5
        with:
          python-version: '3.11'

      - name: Install dependencies
        run: pip install -r requirements.txt || true

      # Script exits 1 only on CRITICAL findings.
      # Warnings are reported but do not block the workflow.
      - name: Run security proofs
        run: |
          python scripts/prove_security.py \
            --output security-proofs-results.json \
            --verbose

      - name: Upload proofs artifacts
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: security-proofs-results
          path: security-proofs-results.json
          retention-days: 30


  # ─────────────────────────────────────────────────────────────────────────
  # Plugin Security Audit
  # ─────────────────────────────────────────────────────────────────────────
  plugin-audit:
    name: Plugin Security Audit
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-python@v5
        with:
          python-version: '3.11'

      # Script exits 1 only on CRITICAL findings (eval/exec in plugins).
      # Missing manifest.json etc are warnings.
      - name: Run plugin audit
        run: |
          python scripts/audit_plugins.py \
            --output plugin-audit-results.json \
            --verbose

      - name: Upload plugin audit artifacts
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: plugin-audit-results
          path: plugin-audit-results.json
          retention-days: 30


  # ─────────────────────────────────────────────────────────────────────────
  # Aggregate Report
  # ─────────────────────────────────────────────────────────────────────────
  security-report:
    name: Security Report
    runs-on: ubuntu-latest
    needs:
      - sast
      - dependency-audit
      - secrets-scan
      - ledmatrix-security-proofs
      - plugin-audit
    if: always()  # Run even if upstream jobs fail or are skipped
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-python@v5
        with:
          python-version: '3.11'

      - name: Download all artifacts
        uses: actions/download-artifact@v4
        with:
          path: audit-artifacts/

      - name: Generate consolidated report
        run: |
          python scripts/generate_report.py \
            --artifact-dir audit-artifacts/ \
            --output security-report.md \
            --verbose

      - name: Upload consolidated report
        uses: actions/upload-artifact@v4
        with:
          name: security-report
          path: security-report.md
          retention-days: 90

      - name: Comment on PR
        if: github.event_name == 'pull_request'
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const report = fs.readFileSync('security-report.md', 'utf8');
            // Use sticky comment — update existing comment rather than adding a new one each run
            const { data: comments } = await github.rest.issues.listComments({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
            });
            const botComment = comments.find(c =>
              c.user.type === 'Bot' && c.body.includes('🔒 Security Audit')
            );
            if (botComment) {
              await github.rest.issues.updateComment({
                comment_id: botComment.id,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: report,
              });
            } else {
              await github.rest.issues.createComment({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: report,
              });
            }