---
- name: Get MAC address of primary physical network interface
  hosts: all
  gather_facts: yes
  tasks:
    - name: Set primary interface fact
      ansible.builtin.set_fact:
        primary_interface: "{{ ansible_default_ipv4.interface }}"

    - name: Debug primary interface
      ansible.builtin.debug:
        msg: "Primary interface is {{ primary_interface }}"

    - name: Get interface info for primary interface
      ansible.builtin.set_fact:
        primary_interface_info: "{{ ansible_facts.interfaces | map('extract', ansible_facts) | selectattr('device', 'match', primary_interface) | first }}"

    - name: Show MAC address
      ansible.builtin.debug:
        msg: "MAC Address of {{ primary_interface }} is {{ primary_interface_info.macaddress }}"