---
- name: Configure static IP using Netplan (only if needed)
  become: true
  when:
    - ansible_distribution == "Ubuntu"
    - ansible_oldip is defined
    - ansible_oldip != ansible_newip
  block:

    - name: Detect primary network interface
      set_fact:
        netplan_interface: "{{ ansible_default_ipv4.interface }}"

    - name: Derive CIDR prefix from netmask (fallback to 24)
      set_fact:
        netmask_bits: "{{ ansible_default_ipv4.netmask | ansible.utils.ipaddr('prefix') | default('24', true) }}"

    - name: Capture system DNS servers (fallback to 8.8.8.8)
      set_fact:
        current_dns_servers: "{{ ansible_dns.nameservers | default(['8.8.8.8']) }}"


    - name: Generate Netplan config with static IP
      ansible.builtin.copy:
        dest: /etc/netplan/01-netcfg.yaml
        mode: '0600'
        content: |
          network:
            version: 2
            renderer: networkd
            ethernets:
              {{ netplan_interface }}:
                dhcp4: no
                addresses: [{{ ansible_newip }}/{{ netmask_bits }}]
                routes:
                  - to: default
                    via: {{ ansible_default_ipv4.gateway }}
                nameservers:
                  addresses: {{ current_dns_servers }}


    - name: Remove default cloud-init netplan config
      ansible.builtin.file:
        path: /etc/netplan/50-cloud-init.yaml
        state: absent
      notify: Apply netplan

    - name: Wait for network change to apply
      ansible.builtin.pause:
        seconds: 10

    - name: Wait for host to become reachable on new IP
      ansible.builtin.wait_for:
        host: "{{ ansible_newip }}"
        port: 22
        delay: 5
        timeout: 120
        state: started

    - name: Reassign ansible_host to the new static IP
      set_fact:
        ansible_host: "{{ ansible_newip }}"