---
- name: Verify Docker Role
  hosts: all
  tasks:
    - name: Verify Docker binary is available
      command: docker version
      register: docker_version_result
      changed_when: false
      failed_when: docker_version_result.rc != 0

    - name: Show Docker version details
      debug:
        msg: >
          Docker Version Output:
          {{ docker_version_result.stdout_lines | join('\n') }}

    - name: Verify Docker service is running
      command: systemctl is-active docker
      register: docker_service_status
      when: ansible_facts.service_mgr == 'systemd'
      changed_when: false
      failed_when: docker_service_status.stdout.strip() != "active"

    - name: Display Docker service status
      debug:
        msg: "Docker service is {{ docker_service_status.stdout.strip() }}"
      when: ansible_facts.service_mgr == 'systemd'

    - name: Pull the 'hello-world' image
      command: docker pull hello-world
      register: docker_pull_result
      changed_when: true
      failed_when: docker_pull_result.rc != 0

    - name: Show result of pulling the 'hello-world' image
      debug:
        msg: >
          Pulling 'hello-world' completed with output:
          {{ docker_pull_result.stdout_lines | join('\n') }}

    # TODO: Currently breaks on GitHub Actions, due to Docker-in-Docker quirks.
    # - name: Run a test container (hello-world)
    #   command: docker run --rm hello-world
    #   register: docker_run_result
    #   changed_when: true
    #   failed_when: docker_run_result.rc != 0

    # - name: Display test container output
    #   debug:
    #     msg: >
    #       Running 'hello-world' container completed with output:
    #       {{ docker_run_result.stdout_lines | join('\n') }}