---

- name: Check state of /etc/network/interfaces
  stat:
    path: /etc/network/interfaces
  register: interfaces_file

- debug:
    msg: A /etc/network/interfaces file already exists, nothing is done.
  when: interfaces_file.stat.exists

- block:
  - name: "Parse addresses"
    shell: "grep Address= /etc/systemd/network/50-default.network | cut -d'=' -f2"
    register: network_address_grep
    check_mode: no
    
  - name: "Parse gateways"
    shell: "grep Gateway= /etc/systemd/network/50-default.network | cut -d'=' -f2"
    register: network_gateway_grep
    check_mode: no

  - name: Prepare variables
    set_fact:
      eni_interface_name: "{{ ansible_default_ipv4.interface }}"
      eni_ipv4_address: "{{ network_address_grep.stdout_lines | ipv4 | first }}"
      eni_ipv4_gateway: "{{ network_gateway_grep.stdout_lines | ipv4 | first }}"
      eni_ipv6_address: "{{ network_address_grep.stdout_lines | ipv6 | first }}"
      eni_ipv6_gateway: "{{ network_gateway_grep.stdout_lines | ipv6 | first }}"

  - name: "A new /etc/network/interfaces is generated"
    template:
      src: interfaces.j2
      dest: /etc/network/interfaces
      mode: "0644"
      owner: root
      group: root

  - name: "Systemd 'networkd' unit is stopped and disabled"
    systemd:
      name: systemd-networkd.service
      enabled: False
      state: stopped

  - name: "Systemd 'networking' unit is restarted (it often results in error)"
    systemd:
      name: networking
      enabled: True
      state: restarted
    ignore_errors: True
  
  - debug:
      msg: You should verify your configuration, then reboot the server.
  when: not interfaces_file.stat.exists