---
# Hostname configuration tasks
- name: Get current hostname
  command: hostname
  register: current_hostname_result
  changed_when: false

- name: Validate target hostname is properly configured
  fail:
    msg: |
      ERROR: target_hostname is not properly configured!
      
      Current hostname: {{ current_hostname_result.stdout }}
      Target hostname: {{ target_hostname | default('NOT SET') }}
      
      Please update your inventory.yml file with the correct target_hostname.
      Example:
        all:
          hosts:
            your-server:
              ansible_host: your_server_ip
              target_hostname: your-desired-hostname
              samba_realm: your.domain.local
              
      The target_hostname must be set in inventory for Samba4 domain controller installation.
  when: 
    - target_hostname is not defined or target_hostname == ""

- name: Display hostname validation status
  debug:
    msg: |
      ✅ Hostname validation passed:
      Current: {{ current_hostname_result.stdout }}
      Target:  {{ target_hostname }}
      Domain:  {{ samba_realm }}
      
      {% if current_hostname_result.stdout == target_hostname %}
      ✅ Hostname is already correctly set - no change needed.
      {% else %}
      ⚠️  Hostname will be changed from {{ current_hostname_result.stdout }} to {{ target_hostname }}
      {% endif %}

- name: Update /etc/hosts with new hostname
  lineinfile:
    path: /etc/hosts
    regexp: '^127\.0\.1\.1\s+.*'
    line: "127.0.1.1 {{ target_hostname }}.{{ samba_realm }} {{ target_hostname }}"
    state: present

- name: Get current server IP address
  shell: |
    # Get the IP of the default route interface
    ip route get 8.8.8.8 | grep -oP 'src \K\S+' | head -1
  register: current_server_ip
  changed_when: false

- name: Add domain entry to /etc/hosts
  lineinfile:
    path: /etc/hosts
    regexp: "^{{ current_server_ip.stdout }}\\s+.*"
    line: "{{ current_server_ip.stdout }} {{ target_hostname }}.{{ samba_realm }} {{ target_hostname }}"
    state: present