name: Security Check

# ========================================
# Automated Security Scanning
# ========================================
# This workflow runs on every PR and push to main
# Optimized to not fail on optional security tools

on:
  push:
    branches: [ main, develop ]
  pull_request:
    branches: [ main, develop ]
  workflow_dispatch:

jobs:
  # ========================================
  # CRITICAL: FILE VALIDATION
  # ========================================
  file-validation:
    name: Critical File Validation
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Check for .env files
        run: |
          echo "==> Checking for .env files..."
          if git ls-files | grep -E "^\.env$"; then
            echo "ERROR: .env file found in repository!"
            echo "This file contains sensitive data and must not be committed"
            exit 1
          fi
          echo "SUCCESS: No .env files in repository"

      - name: Check for sensitive files
        run: |
          echo "==> Checking for sensitive files..."

          # Files that should never be committed
          sensitive_files=(
            "*.key"
            "*.pem"
            "*.cert"
            "*.p12"
            "*.pfx"
          )

          found_sensitive=false
          for pattern in "${sensitive_files[@]}"; do
            # Exclude node_modules and .github
            files=$(git ls-files | grep -i "$pattern" | grep -v "node_modules" | grep -v ".github" || true)
            if [ -n "$files" ]; then
              echo "WARNING: Sensitive file pattern found: $pattern"
              echo "$files"
              found_sensitive=true
            fi
          done

          if [ "$found_sensitive" = true ]; then
            echo "ERROR: Sensitive files detected. Please remove them."
            exit 1
          fi
          echo "SUCCESS: No sensitive files found"

      - name: Verify .gitignore
        run: |
          echo "==> Verifying .gitignore configuration..."
          if ! grep -q "^\.env$" .gitignore; then
            echo "ERROR: .env not found in .gitignore!"
            exit 1
          fi
          if ! grep -q "^\.env\.\*$" .gitignore; then
            echo "WARNING: .env.* pattern not in .gitignore"
          fi
          echo "SUCCESS: .gitignore properly configured"

  # ========================================
  # CRITICAL: ENVIRONMENT VALIDATION
  # ========================================
  env-validation:
    name: Environment Configuration
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Verify .env.example exists
        run: |
          echo "==> Checking for .env.example..."
          if [ ! -f .env.example ]; then
            echo "ERROR: .env.example not found!"
            echo "Please create .env.example with safe placeholder values"
            exit 1
          fi
          echo "SUCCESS: .env.example exists"

      - name: Check .env.example for real secrets
        run: |
          echo "==> Validating .env.example content..."

          # .env.example should NOT contain real long secrets
          if grep -E "(password|key|secret|token)=.{30,}" .env.example | grep -v "your_"; then
            echo "WARNING: .env.example may contain real credentials!"
            echo "Example files should only have placeholder values"
            exit 1
          fi
          echo "SUCCESS: .env.example contains no real secrets"

      - name: Validate environment variable usage
        run: |
          echo "==> Checking environment variable usage..."

          if [ -f "src/contexts/AuthContext.tsx" ]; then
            if grep -q "import.meta.env" src/contexts/AuthContext.tsx; then
              echo "SUCCESS: AuthContext uses environment variables"
            else
              echo "WARNING: AuthContext may not use environment variables"
            fi
          fi

  # ========================================
  # CODE SECURITY ANALYSIS
  # ========================================
  code-security:
    name: Code Security Analysis
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'

      - name: Install dependencies
        run: npm ci

      - name: Check for hardcoded secrets
        run: |
          echo "==> Scanning for hardcoded secrets in code..."

          has_issues=false

          # Check for hardcoded passwords (8+ chars)
          if grep -r "password\s*=\s*['\"][^'\"]\{8,\}['\"]" src/ --include="*.ts" --include="*.tsx" | grep -v "import.meta.env" | grep -v "placeholder" | grep -v "example"; then
            echo "WARNING: Potential hardcoded password found"
            has_issues=true
          fi

          # Check for hardcoded API keys (20+ chars)
          if grep -r "api[_-]\?key\s*=\s*['\"][^'\"]\{20,\}['\"]" src/ --include="*.ts" --include="*.tsx" | grep -v "import.meta.env" | grep -v "your_"; then
            echo "WARNING: Potential hardcoded API key found"
            has_issues=true
          fi

          if [ "$has_issues" = false ]; then
            echo "SUCCESS: No hardcoded secrets detected"
          else
            echo "Please use environment variables for sensitive data"
          fi

      - name: Check for console.log statements
        continue-on-error: true
        run: |
          echo "==> Checking for console.log statements..."
          if grep -r "console\.log" src/ --include="*.ts" --include="*.tsx" | head -10; then
            echo "INFO: console.log statements found (consider removing for production)"
          fi

  # ========================================
  # DEPENDENCY SECURITY
  # ========================================
  dependency-security:
    name: Dependency Security Audit
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'

      - name: Install dependencies
        run: npm ci

      - name: Run npm audit
        continue-on-error: true
        run: |
          echo "==> Running npm audit..."
          npm audit --audit-level=high || echo "WARNING: Vulnerabilities found, please review"

      - name: Check for outdated critical packages
        continue-on-error: true
        run: |
          echo "==> Checking for outdated packages..."
          npm outdated || true

  # ========================================
  # OPTIONAL: ADVANCED SECRET SCANNING
  # ========================================
  advanced-secret-scan:
    name: Advanced Secret Scanning (Optional)
    runs-on: ubuntu-latest
    continue-on-error: true

    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: TruffleHog Secret Scan
        continue-on-error: true
        uses: trufflesecurity/trufflehog@main
        with:
          path: ./
          base: ${{ github.event.repository.default_branch }}
          head: HEAD

      - name: Gitleaks Secret Scan
        if: ${{ secrets.GITLEAKS_LICENSE != '' }}
        continue-on-error: true
        uses: gitleaks/gitleaks-action@v2
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          GITLEAKS_LICENSE: ${{ secrets.GITLEAKS_LICENSE }}

      - name: Basic Pattern Check
        run: |
          echo "==> Running basic secret pattern check..."
          if git diff-tree --no-commit-id --name-only -r HEAD 2>/dev/null | xargs grep -E "(password|secret|api[_-]?key|token)\s*=\s*['\"][A-Za-z0-9]{20,}['\"]" 2>/dev/null; then
            echo "INFO: Potential secrets detected, please review"
          else
            echo "SUCCESS: No obvious secrets in recent changes"
          fi

  # ========================================
  # OPTIONAL: SNYK VULNERABILITY SCAN
  # ========================================
  snyk-scan:
    name: Snyk Vulnerability Scan (Optional)
    runs-on: ubuntu-latest
    if: ${{ secrets.SNYK_TOKEN != '' }}
    continue-on-error: true

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'

      - name: Run Snyk
        uses: snyk/actions/node@master
        continue-on-error: true
        env:
          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
        with:
          args: --severity-threshold=high

  # ========================================
  # SUMMARY
  # ========================================
  security-summary:
    name: Security Summary
    needs: [file-validation, env-validation, code-security, dependency-security]
    runs-on: ubuntu-latest
    if: always()

    steps:
      - name: Print Summary
        run: |
          echo "=========================================="
          echo "Security Check Summary"
          echo "=========================================="
          echo ""
          echo "Critical Checks:"
          echo "  File Validation:       ${{ needs.file-validation.result }}"
          echo "  Environment Config:    ${{ needs.env-validation.result }}"
          echo ""
          echo "Code Quality:"
          echo "  Code Security:         ${{ needs.code-security.result }}"
          echo "  Dependency Security:   ${{ needs.dependency-security.result }}"
          echo ""

          # Fail if critical checks failed
          if [ "${{ needs.file-validation.result }}" != "success" ] || \
             [ "${{ needs.env-validation.result }}" != "success" ]; then
            echo "=========================================="
            echo "CRITICAL SECURITY ISSUES DETECTED!"
            echo "=========================================="
            echo ""
            echo "Please fix the issues above before merging"
            exit 1
          fi

          echo "=========================================="
          echo "All critical security checks passed!"
          echo "=========================================="