---
# Verifies the critical services listed per host in the inventory
# (critical_services) and optionally starts any that are stopped.
#
# Extra vars (optional):
#   restart_stopped - default false; when true, start services found stopped

- name: Check Host Availability
  hosts: ubuntu:rocky
  gather_facts: false
  ignore_unreachable: true

  tasks:
    - name: Ping hosts to check availability
      ansible.builtin.ping:
      register: ping_result
      ignore_errors: true
      ignore_unreachable: true

    - name: Add reachable hosts to group
      ansible.builtin.group_by:
        key: reachable_hosts
      when: ping_result is succeeded

    - name: Report offline hosts
      ansible.builtin.debug:
        msg: "{{ inventory_hostname }} - OFFLINE"
      when: ping_result is not succeeded
      delegate_to: localhost

- name: Service Check
  hosts: reachable_hosts
  become: true
  gather_facts: false

  vars:
    restart_stopped: false

  tasks:
    - name: Gather service facts
      ansible.builtin.service_facts:

    - name: Evaluate critical services
      ansible.builtin.set_fact:
        service_states: >-
          {{ service_states | default([])
             + [{'name': item, 'state': (ansible_facts.services[item ~ '.service'].state | default('not-found'))}] }}
      loop: "{{ critical_services | default([]) }}"

    - name: Print report
      ansible.builtin.debug:
        msg: |
          ======================================================
           HOST: {{ inventory_hostname }} ({{ ansible_host }})
          ======================================================
          {% if service_states | default([]) | length == 0 %}
           no critical services defined in inventory
          {% else %}
          {% for svc in service_states %}
           {{ '%-24s' | format(svc.name) }} {{ 'RUNNING' if svc.state == 'running' else ('NOT FOUND' if svc.state == 'not-found' else svc.state | upper) }}
          {% endfor %}
          {% endif %}
          ======================================================

    - name: Warn on services that are not running
      ansible.builtin.debug:
        msg: "WARNING: {{ item.name }} is {{ 'not installed' if item.state == 'not-found' else item.state }} on {{ inventory_hostname }}"
      loop: "{{ service_states | default([]) }}"
      loop_control:
        label: "{{ item.name }}"
      when: item.state != 'running'

    - name: Start stopped services
      ansible.builtin.service:
        name: "{{ item.name }}"
        state: started
      loop: "{{ service_states | default([]) }}"
      loop_control:
        label: "{{ item.name }}"
      when:
        - restart_stopped | bool
        - item.state not in ['running', 'not-found']