name: Deploy Renovate Updates

on:
  workflow_run:
    workflows: ["Check Renovate Updates"]
    types:
      - completed

jobs:
  deploy:
    runs-on: ubuntu-latest
    if: >
      ${{
        github.event.workflow_run.conclusion == 'success' &&
        contains(toLower(github.event.workflow_run.head_commit.author.name), 'renovate')
      }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0  # we need full history to compute merge-base

      - name: Set up Docker
        uses: docker/setup-buildx-action@v3

      - name: Log in to Docker (if needed)
        uses: docker/login-action@v2
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Install yq
        run: |
          sudo wget https://github.com/mikefarah/yq/releases/latest/download/yq_linux_amd64 -O /usr/bin/yq
          sudo chmod +x /usr/bin/yq

      - name: Get modified services including dependencies
        id: modified_services
        run: |
          echo "Finding modified services in docker-compose.yml..."

          # Find merge-base with previous main commit
          BASE_COMMIT=$(git merge-base HEAD HEAD~1)

          # Extract changed services between merge-base and HEAD
          CHANGED_SERVICES=$(git diff --name-only $BASE_COMMIT HEAD -- docker-compose.yml \
            | xargs -r -I{} yq e '.services | keys | .[]' {})

          if [ -z "$CHANGED_SERVICES" ]; then
            echo "No services changed, skipping."
            exit 0
          fi

          declare -A VISITED
          ALL_DEPLOY=()

          get_deps() {
            local service=$1
            if [[ -n "${VISITED[$service]}" ]]; then
              return
            fi
            VISITED[$service]=1
            ALL_DEPLOY+=("$service")

            # Array style depends_on
            deps=$(yq e ".services.\"$service\".depends_on[]?" docker-compose.yml 2>/dev/null)
            for dep in $deps; do
              get_deps "$dep"
            done

            # Mapping style depends_on (with condition)
            deps_map=$(yq e ".services.\"$service\".depends_on | keys[]" docker-compose.yml 2>/dev/null)
            for dep in $deps_map; do
              get_deps "$dep"
            done
          }

          for svc in $CHANGED_SERVICES; do
            get_deps "$svc"
          done

          echo "Services to deploy: ${ALL_DEPLOY[@]}"
          echo "modified_services=${ALL_DEPLOY[@]}" >> $GITHUB_ENV

      - name: Pull images for modified services
        if: env.modified_services != ''
        run: |
          echo "Pulling images for services: $modified_services"
          for svc in $modified_services; do
            docker compose pull $svc || echo "Failed to pull $svc, continuing..."
          done

      - name: Deploy updated services
        if: env.modified_services != ''
        run: |
          echo "Deploying services: $modified_services"
          docker compose up -d $modified_services