name: Security Scan

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]
  schedule:
    - cron: "0 8 * * 1" # Run every Monday at 08:00 UTC

jobs:
  # ============================================================
  # CodeQL — static analysis for Python + JavaScript/TypeScript
  # ============================================================
  codeql:
    runs-on: ubuntu-latest
    permissions:
      security-events: write
      actions: read
      contents: read

    strategy:
      fail-fast: false
      matrix:
        language: [python, javascript-typescript]

    steps:
      - uses: actions/checkout@v4

      - name: Initialize CodeQL
        uses: github/codeql-action/init@v3
        with:
          languages: ${{ matrix.language }}

      - name: Perform CodeQL Analysis
        uses: github/codeql-action/analyze@v3
        with:
          category: "/language:${{ matrix.language }}"

  # ============================================================
  # Dependency review — check for known vulnerabilities
  # ============================================================
  dependency-review:
    runs-on: ubuntu-latest
    if: github.event_name == 'pull_request'
    steps:
      - uses: actions/checkout@v4

      - name: Dependency Review
        uses: actions/dependency-review-action@v4
        with:
          fail-on-severity: high

  # ============================================================
  # Trivy — scan Docker image for vulnerabilities
  # ============================================================
  trivy-backend:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Build backend image
        run: docker build -t aiagent-backend:scan ./backend

      - name: Run Trivy vulnerability scanner
        uses: aquasecurity/trivy-action@master
        with:
          image-ref: aiagent-backend:scan
          format: sarif
          output: trivy-backend.sarif
          severity: "HIGH,CRITICAL"

      - name: Upload Trivy results
        uses: github/codeql-action/upload-sarif@v3
        if: always()
        with:
          sarif_file: trivy-backend.sarif

  # ============================================================
  # Secret scanning — detect hardcoded secrets
  # ============================================================
  secret-scan:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Gitleaks — scan for secrets
        uses: gitleaks/gitleaks-action@v2
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}