- name: check if record is an object
  fail:
    msg: record must be an object
  when: record is not mapping


- name: check if record zone is a string
  fail:
    msg: record zone must be a string
  when: record.zone is defined and record.zone is not string


- name: check if record zone exists
  fail:
    msg: '"{{ record.zone }}" does not seem to be a valid zone'
  when: (record.zone is defined) and
        (record.zone != 'root') and
        ((int_zones is not defined) or (record.zone not in int_zones))


- name: construct record parameters
  set_fact:
    ns_zone: "{%- if (record.zone is defined) and (record.zone != 'root') -%}{{ record.zone }}\
              {%- else -%}{{ ns_tld | d(int_tld) }}\
              {%- endif -%}"
    ns_name: "{%- if record.name is defined -%}{{ record.name }}\
              {%- else -%}{{ inventory_hostname }}\
              {%- endif -%}"
    ns_type: "{%- if record.type is defined -%}{{ record.type | upper }}\
              {%- else -%}A\
              {%- endif -%}"
    ns_value: "{%- if record.value is defined -%}{{ record.value }}\
               {%- else -%}{{ ansible_host }}\
               {%- endif -%}"

- name: set ns_quote
  set_fact:
    ns_quote: "{{ '\"' if ns_type == 'TXT' else '' }}"


- name: construct full name
  set_fact:
    ns_full_name: '{%- if ns_name != "@" -%}{{ ns_name }}.{%- endif -%}{{ ns_zone }}'


- name: construct regex part
  set_fact:
    ns_regex_part: '{%- if record.allow_multiple is defined -%}{{ (ns_quote ~ ns_value ~ ns_quote) | regex_escape() }}\.?{%- else -%}{{ "" | string }}{%- endif -%}'


- name: construct regex
  set_fact:
    ns_regex: '^{{ ns_full_name | regex_escape() }}\s+\d+\s+IN\s+{{ ns_type | regex_escape() }}\s+{{ ns_regex_part }}'


- name: show debug info
  debug:
    msg: "{{ ns_zone }}  {{ ns_name }}  {{ ns_type }}  {{ ns_quote ~ ns_value ~ ns_quote }}  -->  {{ ns_regex }}"


- name: slurp zone file
  slurp:
    src: "{{ coredns_conf_dir ~ '/' ~ (ns_tld | d(int_tld)) ~ '.zone' }}"
  register: zf
  changed_when: false


- name: enumerate stdout lines to check if an entry already exists
  set_fact:
    ns_exists: "{{ (zf.content | b64decode).split('\n') | select('search', ns_regex) | list | length > 0 }}"


- block:
  - name: fail if there are multiple records
    fail:
      msg: single record mode is selected, but multiple records found
    when: (zf.content | b64decode).split('\n') | select('search', ns_regex) | list | length > 1


  - name: grab the value
    set_fact:
      ns_old_value: "{{ (zf.content | b64decode).split('\n') | select('search', ns_regex) | map('regex_search', '\\s+?(\\S+?)\\.?$', '\\1') | first | join('') }}"


  - name: replace the record
    lineinfile:
      path: "{{ coredns_conf_dir ~ '/' ~ (ns_tld | d(int_tld)) ~ '.zone' }}"
      regexp: '^\s*{{ ns_name | regex_escape() }}\s+IN\s+{{ ns_type | regex_escape() }}\s+'
      line: "{{ ns_name }}\tIN\t{{ ns_type }}\t{{ ns_quote ~ ns_value ~ ns_quote }}"
      backrefs: yes
    when: ns_old_value != (ns_quote ~ ns_value ~ ns_quote)
    register: rr1

  when: ns_exists and rrset.allow_multiple is not defined


- name: add the record if it is missing
  lineinfile:
    path: "{{ coredns_conf_dir ~ '/' ~ (ns_tld | d(int_tld)) ~ '.zone' }}"
    line: "{{ ns_name }}\tIN\t{{ ns_type }}\t{{ ns_quote ~ ns_value ~ ns_quote }}"
  when: not ns_exists
  register: rr2


- name: determine if records were changed
  set_fact:
    ns_records_changed: "{{ ((rr1 is defined) and rr1.changed) or ((rr2 is defined) and rr2.changed) }}"


- name: change serial
  include_tasks: increase_serial.yml
  when: ns_records_changed | d(false) == true


- name: restart coredns
  service:
    name: coredns
    state: restarted
  when: (ns_instant | d(false) == true) and (ns_records_changed or ns_serial_changed)