name: Build and Deploy Demo App
on:
  push:
    branches:
      - main
jobs:
  build-and-deploy:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      - name: Build Docker image
        run: docker build -t demo-app:latest .
      - name: Save Docker image to tar
        run: docker save demo-app:latest > demo-app.tar
      - name: Set up SSH
        run: |
          apt update && apt install -y openssh-client
          mkdir -p ~/.ssh
          echo "${{ secrets.SSH_PRIVATE_KEY }}" > ~/.ssh/id_ed25519
          chmod 600 ~/.ssh/id_ed25519
          eval "$(ssh-agent -s)"
          ssh-add ~/.ssh/id_ed25519
          ssh-keyscan -p ${{ secrets.SERVER_PORT }} ${{ secrets.SERVER_HOST }} >> ~/.ssh/known_hosts
      - name: Copy files to server via SCP
        run: |
          scp -o StrictHostKeyChecking=no -P ${{ secrets.SERVER_PORT }} demo-app.tar ${{ secrets.SERVER_USER }}@${{ secrets.SERVER_HOST }}:${{ secrets.DEPLOY_PATH }}demo-app.tar
          scp -o StrictHostKeyChecking=no -P ${{ secrets.SERVER_PORT }} docker-compose.yml ${{ secrets.SERVER_USER }}@${{ secrets.SERVER_HOST }}:${{ secrets.DEPLOY_PATH }}docker-compose.yml
          scp -o StrictHostKeyChecking=no -P ${{ secrets.SERVER_PORT }} -r nginx_user_conf.d ${{ secrets.SERVER_USER }}@${{ secrets.SERVER_HOST }}:${{ secrets.DEPLOY_PATH }}nginx_user_conf.d
      - name: Deploy on server via SSH
        run: |
          ssh -o StrictHostKeyChecking=no -p ${{ secrets.SERVER_PORT }} ${{ secrets.SERVER_USER }}@${{ secrets.SERVER_HOST }} << EOF
            cd ${{ secrets.DEPLOY_PATH }}

            # Check and install Docker if not present (Ubuntu/Debian assumed)
            if ! command -v docker &> /dev/null; then
              sudo apt update -y
              sudo apt install -y ca-certificates curl
              sudo install -m 0755 -d /etc/apt/keyrings
              sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
              sudo chmod a+r /etc/apt/keyrings/docker.asc
              echo "deb [arch=\$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \$(. /etc/os-release && echo "\$VERSION_CODENAME") stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
              sudo apt update -y
              sudo apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
              sudo systemctl start docker
              sudo systemctl enable docker
            fi

            # Check and install Docker Compose if not present
            if ! command -v docker-compose &> /dev/null; then
              sudo curl -L "https://github.com/docker/compose/releases/latest/download/docker-compose-\$(uname -s)-\$(uname -m)" -o /usr/local/bin/docker-compose
              sudo chmod +x /usr/local/bin/docker-compose
            fi

            # Load image and deploy with Compose
            docker load -i demo-app.tar
            docker-compose down || true  # Graceful stop
            docker-compose up -d

            # Cleanup
            rm demo-app.tar
          EOF