# Comprehensive CI Workflow Template
# ===================================
#
# This template provides a complete CI pipeline for BlackRoad repositories.
# It includes linting, type checking, testing, and build verification.
#
# How to use:
# -----------
# 1. Copy this file to .github/workflows/ci.yml in your repo
# 2. Customize the jobs based on your stack (Python/JS/both)
# 3. Update paths and commands as needed
# 4. Commit and push - CI will run on PRs and pushes
#
# What this workflow does:
# -----------------------
# - Lints code (Python: flake8/black, JS: eslint/prettier)
# - Runs type checking (Python: mypy, TS: tsc)
# - Runs test suite with coverage
# - Builds the application
# - Validates environment config
# - Reports results to PR

name: Continuous Integration

on:
  push:
    branches:
      - main
      - develop
      - 'feature/**'
  pull_request:
    branches:
      - main
      - develop

# Cancel previous runs if new push
concurrency:
  group: ci-${{ github.ref }}
  cancel-in-progress: true

env:
  PYTHON_VERSION: '3.11'
  NODE_VERSION: '20'

jobs:
  # ========================================
  # Job 1: Python Linting
  # ========================================
  lint-python:
    name: Lint Python Code
    runs-on: ubuntu-latest
    timeout-minutes: 5

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

      - name: Set up Python
        uses: actions/setup-python@v4
        with:
          python-version: ${{ env.PYTHON_VERSION }}
          cache: 'pip'
          cache-dependency-path: 'backend/requirements.txt'

      - name: Install linting tools
        run: |
          pip install flake8 black isort mypy

      - name: Run Black (code formatter check)
        run: |
          black --check backend/app
          echo "✅ Black formatting check passed"

      - name: Run isort (import sorting check)
        run: |
          isort --check-only backend/app
          echo "✅ isort check passed"

      - name: Run flake8 (linter)
        run: |
          flake8 backend/app --max-line-length=100 --ignore=E203,W503
          echo "✅ flake8 linting passed"

  # ========================================
  # Job 2: Python Type Checking
  # ========================================
  type-check-python:
    name: Python Type Check
    runs-on: ubuntu-latest
    timeout-minutes: 5

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

      - name: Set up Python
        uses: actions/setup-python@v4
        with:
          python-version: ${{ env.PYTHON_VERSION }}
          cache: 'pip'

      - name: Install dependencies
        run: |
          pip install -r backend/requirements.txt
          pip install mypy types-redis types-requests

      - name: Run mypy
        run: |
          mypy backend/app --ignore-missing-imports
          echo "✅ Type checking passed"

  # ========================================
  # Job 3: Python Tests
  # ========================================
  test-python:
    name: Python Tests
    runs-on: ubuntu-latest
    timeout-minutes: 10

    # Test matrix for multiple Python versions (optional)
    strategy:
      matrix:
        python-version: ['3.11']  # Add ['3.10', '3.11', '3.12'] for multi-version testing

    services:
      # PostgreSQL for tests
      postgres:
        image: postgres:15
        env:
          POSTGRES_USER: test
          POSTGRES_PASSWORD: test
          POSTGRES_DB: blackroad_test
        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
        ports:
          - 5432:5432

      # Redis for tests
      redis:
        image: redis:7
        options: >-
          --health-cmd "redis-cli ping"
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
        ports:
          - 6379:6379

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

      - name: Set up Python
        uses: actions/setup-python@v4
        with:
          python-version: ${{ matrix.python-version }}
          cache: 'pip'

      - name: Install dependencies
        run: |
          pip install -r backend/requirements.txt
          pip install pytest pytest-cov pytest-asyncio

      - name: Set up test environment
        env:
          DATABASE_URL: postgresql://test:test@localhost:5432/blackroad_test
          REDIS_URL: redis://localhost:6379/0
          SECRET_KEY: test-secret-key-for-ci
          ENVIRONMENT: test
        run: |
          echo "Test environment configured"

      - name: Run tests with coverage
        env:
          DATABASE_URL: postgresql://test:test@localhost:5432/blackroad_test
          REDIS_URL: redis://localhost:6379/0
          SECRET_KEY: test-secret-key-for-ci
          ENVIRONMENT: test
        run: |
          cd backend
          pytest -v \
            --cov=app \
            --cov-report=term \
            --cov-report=xml \
            --cov-report=html \
            --maxfail=3

      - name: Upload coverage to Codecov (optional)
        if: success()
        uses: codecov/codecov-action@v3
        with:
          file: ./backend/coverage.xml
          flags: backend
          name: backend-coverage

  # ========================================
  # Job 4: JavaScript/TypeScript Linting (if applicable)
  # ========================================
  lint-javascript:
    name: Lint JavaScript/TypeScript
    runs-on: ubuntu-latest
    timeout-minutes: 5
    # Only run if package.json exists
    if: hashFiles('package.json') != ''

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

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

      - name: Install dependencies
        run: npm ci

      - name: Run ESLint
        run: npm run lint

      - name: Run Prettier check
        run: npm run format:check

  # ========================================
  # Job 5: JavaScript/TypeScript Tests (if applicable)
  # ========================================
  test-javascript:
    name: JavaScript/TypeScript Tests
    runs-on: ubuntu-latest
    timeout-minutes: 10
    if: hashFiles('package.json') != ''

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

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

      - name: Install dependencies
        run: npm ci

      - name: Run tests
        run: npm test -- --coverage

      - name: Upload coverage
        if: success()
        uses: codecov/codecov-action@v3
        with:
          file: ./coverage/coverage-final.json
          flags: frontend
          name: frontend-coverage

  # ========================================
  # Job 6: Build Verification
  # ========================================
  build:
    name: Build Verification
    runs-on: ubuntu-latest
    timeout-minutes: 10

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

      # Python build (if applicable)
      - name: Set up Python
        uses: actions/setup-python@v4
        with:
          python-version: ${{ env.PYTHON_VERSION }}

      - name: Verify Python build
        run: |
          pip install build
          cd backend
          python -m build
          echo "✅ Python package builds successfully"

      # Node build (if applicable)
      - name: Set up Node.js
        if: hashFiles('package.json') != ''
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: 'npm'

      - name: Build frontend (if applicable)
        if: hashFiles('package.json') != ''
        run: |
          npm ci
          npm run build
          echo "✅ Frontend builds successfully"

  # ========================================
  # Job 7: Environment Validation
  # ========================================
  validate-env:
    name: Validate Environment Config
    runs-on: ubuntu-latest
    timeout-minutes: 5

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

      - name: Validate .env.example exists
        run: |
          if [ ! -f backend/.env.example ]; then
            echo "❌ backend/.env.example not found"
            exit 1
          fi
          echo "✅ .env.example exists"

      - name: Validate .env.example is not committed
        run: |
          if [ -f backend/.env ]; then
            echo "❌ backend/.env should not be committed!"
            exit 1
          fi
          echo "✅ .env is gitignored"

      - name: Validate Railway config
        run: |
          if [ -f railway.toml ]; then
            echo "✅ railway.toml exists"
          else
            echo "⚠️  railway.toml not found (not required but recommended)"
          fi

  # ========================================
  # Job 8: Security Scan (optional)
  # ========================================
  security-scan:
    name: Security Scan
    runs-on: ubuntu-latest
    timeout-minutes: 5

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

      - name: Run Bandit (Python security linter)
        run: |
          pip install bandit
          bandit -r backend/app -ll
          echo "✅ Security scan passed"

      - name: Check for secrets in code
        uses: trufflesecurity/trufflehog@main
        with:
          path: ./
          base: ${{ github.event.repository.default_branch }}
          head: HEAD

  # ========================================
  # Job 9: Summary
  # ========================================
  ci-summary:
    name: CI Summary
    runs-on: ubuntu-latest
    needs:
      - lint-python
      - type-check-python
      - test-python
      - build
      - validate-env
    if: always()

    steps:
      - name: Check all jobs passed
        if: |
          needs.lint-python.result == 'failure' ||
          needs.type-check-python.result == 'failure' ||
          needs.test-python.result == 'failure' ||
          needs.build.result == 'failure' ||
          needs.validate-env.result == 'failure'
        run: |
          echo "❌ CI failed - check job logs above"
          exit 1

      - name: All checks passed
        run: |
          echo "✅ All CI checks passed!"
          echo "Code is ready to merge"

# ========================================
# Workflow Summary
# ========================================
#
# This comprehensive CI workflow:
# 1. Lints Python code (black, isort, flake8)
# 2. Type checks Python (mypy)
# 3. Runs Python tests with coverage (pytest)
# 4. Lints JavaScript/TypeScript (eslint, prettier)
# 5. Runs JS/TS tests (jest)
# 6. Verifies build succeeds
# 7. Validates environment configuration
# 8. Scans for security issues
# 9. Provides overall summary
#
# Customize based on your stack:
# - Remove JS jobs if Python-only
# - Remove Python jobs if JS-only
# - Add database migrations check
# - Add API contract tests
# - Add performance benchmarks
#
# Status checks:
# - Configure branch protection to require these jobs
# - Prevents merging failing code
# - Ensures code quality standards