name: Backend Service CI/CD
 
 on:
   push:
     branches: [main]
     paths:
       - 'backend/**'
       - 'backend/.github/workflows/backend.yml'
   pull_request:
     branches: [main]
     paths:
       - 'backend/**'
       - 'backend/.github/workflows/backend.yml'
 
 defaults:
   run:
     working-directory: backend
 
 jobs:
   test:
     name: Lint & Test
     runs-on: ubuntu-latest
     strategy:
       fail-fast: true
       matrix:
         python-version: ['3.11']
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
 
       - name: Cache pip dependencies
         uses: actions/cache@v4
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-backend-${{ hashFiles('backend/requirements.txt') }}
           restore-keys: |
             ${{ runner.os }}-pip-backend-
 
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
           pip install -r requirements.txt
           pip install pytest flake8
 
       - name: Run lint
         run: flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
 
       - name: Run tests
         run: pytest --tb=short -q
 
   deploy:
     name: Deploy Backend Service
     needs: test
     if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     runs-on: ubuntu-latest
     steps:
       - name: Deploy via SSH
         uses: appleboy/ssh-action@v1
         with:
           host: ${{ secrets.SSH_HOST }}
           username: ${{ secrets.SSH_USER }}
           port: ${{ secrets.SSH_PORT }}
           key: ${{ secrets.SSH_PRIVATE_KEY }}
           script: |
             cd /opt/myproject/backend
             git pull origin main
             sudo systemctl restart backend