name: "Pre-pull or Build Docker images"
description: "Prepares all services for docker compose dry-run by pulling images or building them"
inputs:
  services:
    description: "Space-separated list of docker-compose services"
    required: true

runs:
  using: "composite"
  steps:
    - name: Install yq (if missing)
      shell: bash
      run: |
        if ! command -v yq >/dev/null 2>&1; then
          sudo wget -qO /usr/local/bin/yq https://github.com/mikefarah/yq/releases/download/v4.44.1/yq_linux_amd64
          sudo chmod +x /usr/local/bin/yq
        fi

    - name: Pre-pull/build images for services
      shell: bash
      run: |
        echo "Services to resolve: ${{ inputs.services }}"
        for svc in ${{ inputs.services }}; do
          echo "Resolving image for service: $svc"
          image=$(docker compose config | yq -r ".services[\"$svc\"].image // empty")
          build_dir=$(docker compose config | yq -r ".services[\"$svc\"].build.context // empty")

          if [ -n "$image" ]; then
            echo "Pulling image: $image"
            docker pull "$image"
          elif [ -n "$build_dir" ]; then
            echo "Building image for service: $svc from context: $build_dir"
            docker compose build "$svc"
          else
            echo "⚠️ No image or build context for $svc — skipping"
          fi
        done