ansible.azure.automation/roles/azure_agw/tasks/main.yml

---
- name: In application gateway state
  include: "{{ item.state | default('present', true) }}.yml"
  vars:
    agw: "{{ item }}"
  when:
    - action is undefined 
    - (agws | default([], true) | length) > 0
  with_items: "{{ agws }}"

- name: Update/create application gateway
  include: present.yml
  vars:
    agw: "{{ item }}"
  when:
    - action is defined 
    - action == 'present'
    - (agws | default([], true) | length) > 0
  with_items: "{{ agws }}"

- name: Delete application gateway
  include: absent.yml
  vars:
    agw: "{{ item }}"
  when:
    - action is defined 
    - action == 'absent'
    - (agws | default([], true) | length) > 0
  with_items: "{{ agws }}"
...