name: Basic CI

# Basic CI workflow for syntax and lint checks.
# This workflow ensures the codebase has no syntax errors and passes linting.
# It does NOT run tests, start servers, or require external services.

on:
  push:
    branches: [main, master]
  pull_request:
    branches: [main, master]

jobs:
  python-check:
    name: Python Syntax Check
    runs-on: ubuntu-latest
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Set up Python 3.12
        uses: actions/setup-python@v5
        with:
          python-version: '3.12'
          # Use Python 3.12 to match Dockerfile and support f-string expressions with backslashes (PEP 701)

      - name: Install dependencies
        working-directory: ./backend_api_python
        run: |
          python -m pip install --upgrade pip
          # Install dependencies, excluding Windows-only packages (MetaTrader5)
          # MetaTrader5 is Windows-only and not available on Linux, so we filter it out
          grep -v "MetaTrader5" requirements.txt > /tmp/requirements_ci.txt
          pip install -r /tmp/requirements_ci.txt
          # Install dependencies to verify they are installable and enable import checks.

      - name: Python syntax check
        working-directory: ./backend_api_python
        run: |
          # Check Python syntax for all .py files using compileall
          # This catches syntax errors, indentation issues, and basic structural problems
          echo "Checking Python syntax..."
          python -m py_compile run.py
          python -m compileall -q app/ scripts/ || (echo "Python syntax check failed" && exit 1)
          echo "✓ Python syntax check passed"

      - name: Python import check
        working-directory: ./backend_api_python
        run: |
          # Verify critical modules can be imported
          # We import but do NOT call create_app() to avoid triggering:
          # - Database connections
          # - Worker threads
          # - Network services
          python -c "
          import sys
          sys.path.insert(0, '.')
          
          # Import key modules to verify they are loadable
          from app import create_app
          from app.config import settings
          from app.routes import health
          
          print('✓ Core modules imported successfully')
          print('✓ No critical import errors detected')
          "
          # This will FAIL if:
          # - Critical imports fail (missing dependencies, broken module structure)
          # This will PASS if:
          # - Dependencies are available and importable
          # - Core module structure is intact

  frontend-check:
    name: Frontend Syntax Check
    runs-on: ubuntu-latest
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'
          # Use Node.js 20 to meet dependency requirements (commander@14.0.0 requires Node >= 20)
          # Note: Dockerfile uses Node 18, but dependencies require Node 20

      - name: Install dependencies
        working-directory: ./quantdinger_vue
        env:
          HUSKY: 0
          # Disable husky in CI (git hooks are not needed in CI environment)
        run: |
          # Project uses yarn (as specified in package.json packageManager field)
          # Enable corepack to use the correct yarn version
          corepack enable
          # Configure yarn registry with fallback to mirror for better reliability
          # Try official registry first, fallback to Taobao mirror if needed
          yarn config set registry https://registry.npmjs.org/ || true
          yarn config set network-timeout 300000 || true
          # IMPORTANT: skip lifecycle scripts in CI to avoid running `prepare` (husky install),
          # which fails because `.git` is not present in GitHub Actions checkouts by default.
          # Retry logic: try up to 3 times with exponential backoff
          max_retries=3
          retry_count=0
          while [ $retry_count -lt $max_retries ]; do
            if yarn install --frozen-lockfile --ignore-scripts; then
              echo "✓ Dependencies installed successfully"
              break
            else
              retry_count=$((retry_count + 1))
              if [ $retry_count -lt $max_retries ]; then
                echo "⚠ Install failed, retrying ($retry_count/$max_retries)..."
                # Switch to Taobao mirror on retry for better reliability in China/network issues
                if [ $retry_count -eq 2 ]; then
                  echo "Switching to Taobao mirror for retry..."
                  yarn config set registry https://registry.npmmirror.com/ || true
                fi
                sleep $((retry_count * 5))
              else
                echo "✗ Failed to install dependencies after $max_retries attempts"
                exit 1
              fi
            fi
          done
          # Use --frozen-lockfile for reproducible installs. Use --ignore-scripts to keep CI non-intrusive.

      - name: Frontend lint check
        working-directory: ./quantdinger_vue
        run: |
          # Run ESLint to check JavaScript/Vue syntax and code quality
          # Using --no-fix to ensure we only check, not modify code
          npm run lint:nofix
          # This will FAIL if:
          # - JavaScript/Vue syntax errors exist
          # - ESLint rules are violated
          # This will PASS if:
          # - Code is syntactically valid
          # - Code passes ESLint rules