name: Deploy to Docker Swarm (Worker Node)

on:
  push:
    branches: [main]

jobs:
  deploy:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repo
        uses: actions/checkout@v2

      - name: Build and push Docker image
        run: |
          docker build -t ghcr.io/serverussnap/imagegenerator:latest .
          echo "${{ secrets.GHCR_TOKEN }}" | docker login ghcr.io -u serverussnap --password-stdin
          docker push ghcr.io/serverussnap/imagegenerator:latest

      - name: Add SSH key to known_hosts
        run: |
          mkdir -p ~/.ssh
          ssh-keyscan -H ${{ secrets.VM_HOST }} >> ~/.ssh/known_hosts

      - name: Setup SSH key
        run: |
          mkdir -p ~/.ssh
          echo "${{ secrets.VM_SSH_KEY }}" > ~/.ssh/id_rsa
          chmod 600 ~/.ssh/id_rsa

      - name: Test SSH connection
        run: |
          ssh -v -i ~/.ssh/id_rsa ${{ secrets.VM_USER }}@${{ secrets.VM_HOST }} "echo 'SSH Connection successful!'"

      - name: Deploy to Swarm Worker Node
        uses: appleboy/ssh-action@v1.0.0
        with:
          host: ${{ secrets.VM_HOST }}
          username: ${{ secrets.VM_USER }}
          key: ${{ secrets.VM_SSH_KEY }}
          script: |
            docker login ghcr.io -u serverussnap -p ${{ secrets.GHCR_TOKEN }}
            
            if docker service inspect imagegenerator_service >/dev/null 2>&1; then
              docker service update \
                --image ghcr.io/serverussnap/imagegenerator:latest \
                --publish-add 3050:3000 \
                --constraint node.hostname==worker \
                --with-registry-auth \
                imagegenerator_service
            else
              docker service create \
                --name imagegenerator_service \
                --publish 3050:3000 \
                --constraint node.hostname==worker \
                --with-registry-auth \
                ghcr.io/serverussnap/imagegenerator:latest
            fi
            
            docker image prune -a -f