---
- name: Change Ubuntu hostnames from CSV
  hosts: all
  become: true
  gather_facts: true

  vars:
    csv_file: "{{ playbook_dir }}/files/hqrs.csv"

  tasks:

    - name: Read CSV file
      community.general.read_csv:
        path: "{{ csv_file }}"
      register: csv_data
      delegate_to: localhost
      run_once: true

    - name: Match current host with CSV entry
      set_fact:
        matched_host: "{{ item }}"
      loop: "{{ csv_data.list }}"
      when: item.ip_address == ansible_host

    - name: Stop play if no CSV match found
      fail:
        msg: "No matching entry found in CSV for {{ inventory_hostname }}"
      when: matched_host is not defined

    - name: Show hostname change
      debug:
        msg: "Changing hostname from {{ matched_host.old_hostname }} to {{ matched_host.new_hostname }}"

    - name: Verify existing hostname
      fail:
        msg: "Hostname mismatch! Current hostname is {{ ansible_hostname }} but expected {{ matched_host.old_hostname }}"
      when: ansible_hostname != matched_host.old_hostname

    - name: Set new hostname
      hostname:
        name: "{{ matched_host.new_hostname }}"

    - name: Update /etc/hosts
      lineinfile:
        path: /etc/hosts
        regexp: '^127\.0\.1\.1'
        line: "127.0.1.1 {{ matched_host.new_hostname }}"
        state: present

    - name: Restart systemd-hostnamed
      service:
        name: systemd-hostnamed
        state: restarted

    - name: Reboot machine
      reboot:
        reboot_timeout: 300

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