---
- name: SWARM | Ensure Docker SDK for Python is installed
  ansible.builtin.apt:
    name: python3-docker
    state: present

- name: SWARM | Get interface IP address for the manager
  ansible.builtin.set_fact:
    manager_ip: "{{ hostvars[inventory_hostname]['ansible_' + private_interface]['ipv4']['address'] }}"
  when: inventory_hostname == groups['managers'][0]

- name: SWARM | Initialize the Docker Swarm
  community.docker.docker_swarm:
    state: present
    advertise_addr: "{{ manager_ip }}"
  when: inventory_hostname == groups['managers'][0]
  register: swarm_init_result

- name: SWARM | Get the join tokens
  community.docker.docker_swarm_info:
  register: swarm_info
  when: inventory_hostname == groups['managers'][0]

- name: SWARM | Verify that join tokens were fetched
  ansible.builtin.assert:
    that:
      - swarm_info is defined
      - swarm_info.swarm_facts is defined
      - swarm_info.swarm_facts.JoinTokens.Manager is defined
      - swarm_info.swarm_facts.JoinTokens.Worker is defined
    fail_msg: "Konnte die Join-Tokens vom Swarm Manager nicht abrufen. Ist der Swarm korrekt initialisiert?"
    success_msg: "Join-Tokens erfolgreich abgerufen."
  when: inventory_hostname == groups['managers'][0]

- name: SWARM | Join manager nodes to the Swarm
  community.docker.docker_swarm:
    state: join
    remote_addrs: [ "{{ hostvars[groups['managers'][0]]['manager_ip'] }}:2377" ]
    join_token: "{{ hostvars[groups['managers'][0]]['swarm_info']['swarm_facts']['JoinTokens']['Manager'] }}"
  when: inventory_hostname in groups['managers']

- name: SWARM | Join worker nodes to the Swarm
  community.docker.docker_swarm:
    state: join
    remote_addrs: [ "{{ hostvars[groups['managers'][0]]['manager_ip'] }}:2377" ]
    join_token: "{{ hostvars[groups['managers'][0]]['swarm_info']['swarm_facts']['JoinTokens']['Worker'] }}"
  when: inventory_hostname in groups['workers']

- name: SWARM | Verify Swarm Cluster State (run on manager)
  ansible.builtin.command: docker node ls
  register: swarm_nodes
  changed_when: false
  when: inventory_hostname == groups['managers'][0]

- name: SWARM | Display cluster state
  ansible.builtin.debug:
    msg: "{{ swarm_nodes.stdout_lines }}"
  when: inventory_hostname == groups['managers'][0]