---

- name: Skip static IP configuration when disabled
  ansible.builtin.meta: end_host
  when: not (netplan_static_enabled | default(false) | bool)

- name: Require netplan_static_address
  ansible.builtin.assert:
    that:
      - netplan_static_address is defined
      - netplan_static_address | length > 0
    fail_msg: "netplan_static_address is required when netplan_static_enabled=true (example: 10.0.0.6/24)."

- name: Detect default interface
  ansible.builtin.shell: "ip route show default | awk '/^default/ {print $5; exit}'"
  register: _netplan_default_iface
  changed_when: false
  when: (netplan_static_iface | default('') | length) == 0

- name: Set effective interface
  ansible.builtin.set_fact:
    netplan_static_iface_effective: >-
      {{ (netplan_static_iface | default(''))
         if (netplan_static_iface | default('') | length) > 0
         else (_netplan_default_iface.stdout | default('') | trim) }}

- name: Require detected interface
  ansible.builtin.assert:
    that:
      - netplan_static_iface_effective | length > 0
    fail_msg: "Unable to detect default interface for static IP. Set netplan_static_iface explicitly (e.g., eth0)."

- name: Detect default gateway
  ansible.builtin.shell: "ip route show default | awk '/^default/ {print $3; exit}'"
  register: _netplan_default_gw
  changed_when: false
  when: (netplan_static_gateway4 | default('') | length) == 0

- name: Set effective gateway
  ansible.builtin.set_fact:
    netplan_static_gateway4_effective: >-
      {{ (netplan_static_gateway4 | default(''))
         if (netplan_static_gateway4 | default('') | length) > 0
         else (_netplan_default_gw.stdout | default('') | trim) }}

- name: Detect current DNS servers
  ansible.builtin.shell: "awk '/^nameserver[[:space:]]+/ {print $2}' /etc/resolv.conf | head -n 5"
  register: _netplan_dns_detect
  changed_when: false
  when: (netplan_static_nameservers | default([])) | length == 0

- name: Set effective DNS servers
  ansible.builtin.set_fact:
    netplan_static_nameservers_effective: >-
      {{ (netplan_static_nameservers | default([]))
         if ((netplan_static_nameservers | default([])) | length) > 0
         else (_netplan_dns_detect.stdout_lines | default([])) }}

- name: Write netplan static config (NetworkManager)
  ansible.builtin.template:
    src: 99-ansible-static.yaml.j2
    dest: /etc/netplan/99-ansible-static.yaml
    owner: root
    group: root
    mode: "0644"
  register: _netplan_cfg

- name: Validate netplan config
  ansible.builtin.command: netplan generate
  changed_when: false
  when: _netplan_cfg is changed

- name: Apply netplan config
  ansible.builtin.command: netplan apply
  changed_when: false
  when: _netplan_cfg is changed