name: Deploy Stack to Swarm

on:
  push:
    branches:
      - main
    paths:
      - 'stacks/**/stack.yml'

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Detect changed stacks
        id: changes
        run: |
          if [ "${{ github.event.before }}" = "0000000000000000000000000000000000000000" ]; then
            echo "⚠️  Initial commit - skipping"
            echo "changed=" >> $GITHUB_OUTPUT
            exit 0
          fi

          CHANGED=$(git diff --name-only ${{ github.event.before }} ${{ github.sha }} | grep "stacks/.*/stack.yml$" || true)
          echo "changed=$CHANGED" >> $GITHUB_OUTPUT

      - name: Deploy changed stacks
        if: steps.changes.outputs.changed != ''
        run: |
          for file in ${{ steps.changes.outputs.changed }}; do
            stack_name=$(basename $(dirname "$file"))
            echo "🚀 Deploying: $stack_name"
            docker stack deploy -c "$file" "$stack_name" --with-registry-auth
          done