name: Deploy to Swarm

on:
  push:
    branches:
      - main  # Only deploys from main branch (staging is safe!)
    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 auto-deploy"
            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: |
          echo "📋 Changed stacks:"
          echo "${{ steps.changes.outputs.changed }}"
          
          for file in ${{ steps.changes.outputs.changed }}; do
            stack_name=$(basename $(dirname "$file"))
            
            echo "🚀 Deploying: $stack_name"
            
            if docker stack deploy -c "$file" "$stack_name" --with-registry-auth; then
              echo "✅ $stack_name deployed"
            else
              echo "❌ $stack_name failed"
              exit 1
            fi
          done

      - name: Show deployment status
        if: always()
        run: |
          echo "📊 Current stacks:"
          docker stack ls
          echo ""
          echo "📦 Services:"
          docker service ls