name: Deploy to Swarm

on:
  push:
    paths:
      - 'docker/**'

jobs:
  fact-finding:
    name: Detect changed environments
    runs-on: ubuntu-latest
    outputs:
      changed_envs: ${{ steps.detect.outputs.changed_envs }}
    steps:
      - uses: actions/checkout@v4
      - name: Determine which environments changed
        id: detect
        run: |
          echo "changed_envs=$(git diff --name-only ${{ github.event.before }} ${{ github.sha }} | grep '^docker/' | cut -d/ -f2 | sort -u | tr '\n' ' ')" >> "$GITHUB_OUTPUT"
  deploy:
    name: Deploy
    runs-on: ubuntu-latest
    needs: fact-finding
    strategy:
      matrix:
        env: [ test ]
    environment: ${{ matrix.env }}
    steps:
      - uses: actions/checkout@v4
      - name: Exit if this environment wasn't changed
        run: |
          echo "Changed envs: '${{ needs.fact-finding.outputs.changed_envs }}'"
          if [[ ! " ${{ needs.fact-finding.outputs.changed_envs }} " =~ " ${{ matrix.env }} " ]]; then
            echo "Environment '${{ matrix.env }}' was not modified. Skipping."
            exit 0
          fi
      - name: Build & push Nginx image to GHCR
        if: steps.detect.outputs.changed_envs != ''
        run: |
          docker build -t ghcr.io/2martens/docker-nginx:${{ matrix.env }} docker/${{ matrix.env }}/nginx
          echo "${{ secrets.GHCR_PAT }}" | docker login ghcr.io -u 2martens --password-stdin
          docker push ghcr.io/2martens/docker-nginx:${{ matrix.env }}
      - name: Copy files to remote
        if: steps.detect.outputs.changed_envs != ''
        uses: burnett01/rsync-deployments@7.0.2
        with:
          switches: -az -r --del
          path: docker/${{ matrix.env }}/stack-config/.
          remote_path: ~/tmp/stack-config
          remote_host: ${{ secrets.DEPLOY_HOST }}
          remote_port: ${{ secrets.DEPLOY_PORT }}
          remote_user: ${{ secrets.DEPLOY_USER }}
          remote_key: ${{ secrets.DEPLOY_KEY }}
      - name: Deploy applications
        uses: appleboy/ssh-action@v1
        with:
          host: ${{ secrets.DEPLOY_HOST }}
          username: ${{ secrets.DEPLOY_USER }}
          key: ${{ secrets.DEPLOY_KEY }}
          script: |
            docker pull ghcr.io/2martens/docker-nginx:${{ matrix.env }}
            docker service update --image ghcr.io/2martens/docker-nginx:${{ matrix.env }} nginx-proxy
            for f in ~/tmp/stack-config/*.yaml; do
              NAME=$(basename "$f" .yaml)
              docker stack deploy -c "$f" "$NAME"
            done