name: Security Audit

on:
  schedule:
    # Run weekly on Monday at 6:00 UTC
    - cron: '0 6 * * 1'
  push:
    paths:
      - 'backend/**'
      - 'frontend/**'
      - 'Dockerfile'
      - 'docker-compose*.yml'
      - 'requirements.txt'
      - 'frontend/package*.json'
      - '.github/workflows/security.yml'
  pull_request:
    paths:
      - 'backend/**'
      - 'frontend/**'
      - 'Dockerfile'
      - 'docker-compose*.yml'
      - 'requirements.txt'
      - 'frontend/package*.json'
      - '.github/workflows/security.yml'
  workflow_dispatch:
    # Allow manual trigger

env:
  PYTHON_VERSION: '3.11'
  NODE_VERSION: '22'

# Default permissions for all jobs
permissions:
  contents: read

jobs:
  bandit:
    name: Python Security Analysis (Bandit)
    runs-on: ubuntu-latest
    permissions:
      contents: read
      security-events: write
    steps:
      - uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: ${{ env.PYTHON_VERSION }}

      - name: Install Bandit
        run: pip install bandit[sarif]

      - name: Run Bandit
        run: |
          bandit -r backend/ -f sarif -o bandit-results.sarif --severity-level medium || true

      - name: Upload Bandit results to GitHub Security
        uses: github/codeql-action/upload-sarif@v4
        if: always()
        with:
          sarif_file: bandit-results.sarif
          category: bandit

  trivy:
    name: Container Security Scan (Trivy)
    runs-on: ubuntu-latest
    permissions:
      contents: read
      security-events: write
    steps:
      - uses: actions/checkout@v4

      - name: Build Docker image
        run: docker build -t bambuddy:security-scan .

      - name: Run Trivy vulnerability scanner
        uses: aquasecurity/trivy-action@v0.35.0
        with:
          image-ref: 'bambuddy:security-scan'
          format: 'sarif'
          output: 'trivy-results.sarif'
          severity: 'CRITICAL,HIGH,MEDIUM'
          version: 'v0.69.1'

      - name: Upload Trivy results to GitHub Security
        uses: github/codeql-action/upload-sarif@v4
        if: always() && hashFiles('trivy-results.sarif') != ''
        with:
          sarif_file: trivy-results.sarif
          category: trivy

      - name: Run Trivy for Dockerfile/IaC
        uses: aquasecurity/trivy-action@v0.35.0
        with:
          scan-type: 'config'
          scan-ref: '.'
          format: 'sarif'
          output: 'trivy-config-results.sarif'
          severity: 'CRITICAL,HIGH,MEDIUM'
          version: 'v0.69.1'

      - name: Upload Trivy config results
        uses: github/codeql-action/upload-sarif@v4
        if: always() && hashFiles('trivy-config-results.sarif') != ''
        with:
          sarif_file: trivy-config-results.sarif
          category: trivy-config

  backend-audit:
    name: Backend Security Audit
    runs-on: ubuntu-latest
    permissions:
      contents: read
      issues: write
    steps:
      - uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: ${{ env.PYTHON_VERSION }}

      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install -r requirements.txt
          pip install pip-audit

      - name: Run pip-audit
        id: pip-audit
        run: |
          # CVE-2026-4539: low-severity ReDoS in Pygments AdlLexer (indirect dep via mkdocs-material/pytest/rich).
          # No fix available yet. Remove --ignore-vuln once Pygments releases a patched version.
          pip-audit --desc on --format json --output pip-audit-results.json --ignore-vuln CVE-2026-4539 || echo "vulnerabilities_found=true" >> $GITHUB_OUTPUT
          pip-audit --desc on --ignore-vuln CVE-2026-4539 || true

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

      - name: Create or close pip security issue
        if: always()
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');

            // Check for existing open issue
            const existingIssues = await github.rest.issues.listForRepo({
              owner: context.repo.owner,
              repo: context.repo.repo,
              state: 'open',
              labels: 'security,automated'
            });
            const existingIssue = existingIssues.data.find(i => i.title.startsWith('Security Alert:') && i.title.includes('Python'));

            // If no vulnerabilities found, auto-close any stale issue
            if ('${{ steps.pip-audit.outputs.vulnerabilities_found }}' !== 'true') {
              if (existingIssue) {
                await github.rest.issues.createComment({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: existingIssue.number,
                  body: 'All Python vulnerabilities have been resolved. Closing automatically.'
                });
                await github.rest.issues.update({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: existingIssue.number,
                  state: 'closed'
                });
                console.log(`Auto-closed resolved issue #${existingIssue.number}`);
              }
              return;
            }

            let results;
            try {
              results = JSON.parse(fs.readFileSync('pip-audit-results.json', 'utf8'));
            } catch {
              console.log('Could not read audit results');
              return;
            }

            // Build vulnerability table
            let table = '| Package | Version | Vulnerability | Fix Version |\n';
            table += '|---------|---------|---------------|-------------|\n';

            for (const vuln of results.dependencies || []) {
              for (const v of vuln.vulns || []) {
                table += `| ${vuln.name} | ${vuln.version} | ${v.id} | ${v.fix_versions?.join(', ') || 'N/A'} |\n`;
              }
            }

            const vulnCount = results.dependencies?.reduce((acc, d) => acc + (d.vulns?.length || 0), 0) || 0;

            if (vulnCount === 0) {
              console.log('No vulnerabilities to report');
              if (existingIssue) {
                await github.rest.issues.createComment({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: existingIssue.number,
                  body: 'All Python vulnerabilities have been resolved. Closing automatically.'
                });
                await github.rest.issues.update({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: existingIssue.number,
                  state: 'closed'
                });
                console.log(`Auto-closed resolved issue #${existingIssue.number}`);
              }
              return;
            }

            const title = `Security Alert: ${vulnCount} Python vulnerabilities found`;

            const body = `## Automated Security Audit Results

            The weekly security audit found vulnerabilities in Python dependencies.

            ${table}

            ### Recommended Actions

            1. Review each vulnerability
            2. Update affected packages: \`pip install --upgrade <package>\`
            3. Run \`pip-audit\` locally to verify fixes

            ---
            *This issue was automatically created by the security audit workflow.*`;

            if (existingIssue) {
              await github.rest.issues.update({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: existingIssue.number,
                body: body
              });
              console.log(`Updated existing issue #${existingIssue.number}`);
            } else {
              await github.rest.issues.create({
                owner: context.repo.owner,
                repo: context.repo.repo,
                title: title,
                body: body,
                labels: ['security', 'automated', 'dependencies']
              });
              console.log('Created new security issue');
            }

  frontend-audit:
    name: Frontend Security Audit
    runs-on: ubuntu-latest
    permissions:
      contents: read
      issues: write
    steps:
      - uses: actions/checkout@v4

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: 'npm'
          cache-dependency-path: frontend/package-lock.json

      - name: Install dependencies
        working-directory: frontend
        run: npm ci

      - name: Run npm audit
        id: npm-audit
        working-directory: frontend
        run: |
          npm audit --omit=dev --json > npm-audit-raw.json 2>/dev/null || true
          # Filter audit results to only include actual project dependencies.
          # npm 10.x audit/ls reports vulns in its own bundled deps (npm, tar, minimatch)
          # so we parse package-lock.json directly to get the real prod dep list.
          node -e "
            const fs = require('fs');
            const raw = fs.readFileSync('npm-audit-raw.json', 'utf8');
            let results;
            try { results = JSON.parse(raw); } catch { results = { vulnerabilities: {} }; }
            const lock = JSON.parse(fs.readFileSync('package-lock.json', 'utf8'));
            const prodDeps = new Set();
            for (const [path, info] of Object.entries(lock.packages || {})) {
              if (path && !info.dev && !info.devOptional) {
                prodDeps.add(path.split('node_modules/').pop());
              }
            }
            const vulns = results.vulnerabilities || {};
            const filtered = {};
            for (const [name, info] of Object.entries(vulns)) {
              if (prodDeps.has(name)) filtered[name] = info;
            }
            results.vulnerabilities = filtered;
            fs.writeFileSync('npm-audit-results.json', JSON.stringify(results, null, 2));
            const count = Object.keys(filtered).length;
            console.log(count > 0
              ? count + ' production vulnerabilities found'
              : 'No production vulnerabilities (filtered ' + Object.keys(vulns).length + ' npm-internal entries)');
            if (count > 0) process.exit(1);
          " || echo "vulnerabilities_found=true" >> $GITHUB_OUTPUT
          npm audit --omit=dev --audit-level=high || true

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

      - name: Create or close npm security issue
        if: always()
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');

            // Check for existing open issue
            const existingIssues = await github.rest.issues.listForRepo({
              owner: context.repo.owner,
              repo: context.repo.repo,
              state: 'open',
              labels: 'security,automated'
            });
            const existingIssue = existingIssues.data.find(i => i.title.startsWith('Security Alert:') && i.title.includes('npm'));

            // If filter didn't flag vulnerabilities, auto-close any stale issue
            if ('${{ steps.npm-audit.outputs.vulnerabilities_found }}' !== 'true') {
              if (existingIssue) {
                await github.rest.issues.createComment({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: existingIssue.number,
                  body: 'All npm production vulnerabilities have been resolved. Closing automatically.'
                });
                await github.rest.issues.update({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: existingIssue.number,
                  state: 'closed'
                });
                console.log(`Auto-closed resolved issue #${existingIssue.number}`);
              }
              return;
            }

            let results;
            try {
              results = JSON.parse(fs.readFileSync('frontend/npm-audit-results.json', 'utf8'));
            } catch {
              console.log('Could not read filtered audit results');
              return;
            }

            const vulns = results.vulnerabilities || {};
            const vulnCount = Object.keys(vulns).length;

            if (vulnCount === 0) {
              console.log('No vulnerabilities to report');
              if (existingIssue) {
                await github.rest.issues.createComment({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: existingIssue.number,
                  body: 'All npm production vulnerabilities have been resolved. Closing automatically.'
                });
                await github.rest.issues.update({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: existingIssue.number,
                  state: 'closed'
                });
                console.log(`Auto-closed resolved issue #${existingIssue.number}`);
              }
              return;
            }

            // Build vulnerability table
            let table = '| Package | Severity | Via | Fix |\n';
            table += '|---------|----------|-----|-----|\n';

            for (const [name, info] of Object.entries(vulns)) {
              const via = Array.isArray(info.via) ? info.via.map(v => typeof v === 'string' ? v : v.name).join(', ') : info.via;
              table += `| ${name} | ${info.severity} | ${via} | ${info.fixAvailable ? 'Yes' : 'No'} |\n`;
            }

            const title = `Security Alert: ${vulnCount} npm vulnerabilities found`;

            const body = `## Automated Security Audit Results

            The weekly security audit found vulnerabilities in npm dependencies.

            ${table}

            ### Recommended Actions

            1. Review each vulnerability: \`npm audit\`
            2. Auto-fix if possible: \`npm audit fix\`
            3. Manual fix for breaking changes: \`npm audit fix --force\` (review changes!)

            ---
            *This issue was automatically created by the security audit workflow.*`;

            if (existingIssue) {
              await github.rest.issues.update({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: existingIssue.number,
                body: body
              });
              console.log(`Updated existing issue #${existingIssue.number}`);
            } else {
              await github.rest.issues.create({
                owner: context.repo.owner,
                repo: context.repo.repo,
                title: title,
                body: body,
                labels: ['security', 'automated', 'dependencies']
              });
              console.log('Created new security issue');
            }