name: Deploy to Swarm

on:
  workflow_dispatch:
    inputs:
      deploy:
        description: 'Should we deploy?'
        required: true
        type: boolean
  push:
    paths:
      - 'docker/**'

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: 2martens/docker-nginx

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: ${{ matrix.env }}
    permissions:
      contents: read
      packages: write
      attestations: write
      id-token: write
    steps:
      - uses: actions/checkout@v4
      - name: Exit if this environment wasn't changed
        id: check
        run: |
          echo "Changed envs: '${{ needs.fact-finding.outputs.changed_envs }}'"
          if [[ ${{ github.event_name }} == 'workflow_dispatch' && "${{ github.event.inputs.deploy }}" == 'true' || "${{ needs.fact-finding.outputs.changed_envs }}" =~ "${{ matrix.env }}" ]]; then
            echo "should_deploy=true" >> $GITHUB_OUTPUT
          else
            echo "should_deploy=false" >> $GITHUB_OUTPUT
          fi
        shell: bash
      - name: Perform docker login
        if: steps.check.outputs.should_deploy == 'true'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Extract metadata (tags, labels) for Docker
        id: meta
        if: steps.check.outputs.should_deploy == 'true'
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=raw,value=${{ matrix.env }}
      - name: Build & push Nginx image to GHCR
        if: steps.check.outputs.should_deploy == 'true'
        uses: docker/build-push-action@v6
        with:
          context: docker/${{ matrix.env }}/nginx
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
      - name: Copy files to remote
        if: steps.check.outputs.should_deploy == 'true'
        uses: burnett01/rsync-deployments@7.0.2
        with:
          switches: -az -r --del
          path: docker/${{ matrix.env }}/stack-config/.
          remote_path: ~/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
        if: steps.check.outputs.should_deploy == 'true'
        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