---
- name: Check if target file exists
  ansible.builtin.stat:
    path: '{{ _target_path }}'
  register: _target_file_stat
  delegate_to: '{{ prometheus_target_host }}'

- name: Read target file
  ansible.builtin.slurp:
    src: '{{ _target_path }}'
  register: _target_file_content
  delegate_to: '{{ prometheus_target_host }}'
  when: _target_file_stat.stat.exists

- name: Parse YAML and add host to matching target group
  ansible.builtin.set_fact:
    _updated_targets: >-
      {%- set targets = (_target_file_content.content | b64decode | from_yaml) if _target_file_stat.stat.exists else [] -%}
      {%- set targets = targets if targets is not none else [] -%}
      {%- set ns = namespace(found=false, result=[], match=true) -%}
      {%- for group in targets -%}
        {%- set group_labels = group.labels | default({}) -%}
        {%- set ns.match = true -%}
        {%- if _target_labels | length != group_labels | length -%}
          {%- set ns.match = false -%}
        {%- else -%}
          {%- for key, value in _target_labels.items() -%}
            {%- if group_labels.get(key) != value -%}
              {%- set ns.match = false -%}
            {%- endif -%}
          {%- endfor -%}
        {%- endif -%}
        {%- if ns.match -%}
          {%- if _target_host not in group.targets -%}
            {%- set _ = group.targets.append(_target_host) -%}
          {%- endif -%}
          {%- set ns.found = true -%}
          {%- set _ = ns.result.append(group) -%}
        {%- else -%}
          {%- set filtered_targets = group.targets | reject('equalto', _target_host) | list -%}
          {%- if filtered_targets | length > 0 -%}
            {%- if group_labels | length > 0 -%}
              {%- set _ = ns.result.append({'labels': group_labels, 'targets': filtered_targets}) -%}
            {%- else -%}
              {%- set _ = ns.result.append({'targets': filtered_targets}) -%}
            {%- endif -%}
          {%- endif -%}
        {%- endif -%}
      {%- endfor -%}
      {%- if not ns.found -%}
        {%- if _target_labels | length > 0 -%}
          {%- set new_group = {'labels': _target_labels, 'targets': [_target_host]} -%}
        {%- else -%}
          {%- set new_group = {'targets': [_target_host]} -%}
        {%- endif -%}
        {%- set _ = ns.result.append(new_group) -%}
      {%- endif -%}
      {{ ns.result }}

- name: Write updated target file
  ansible.builtin.copy:
    content: '{{ _updated_targets | to_nice_yaml(indent=2, width=1337) }}'
    dest: '{{ _target_path }}'
    mode: '0644'
  delegate_to: '{{ prometheus_target_host }}'
  become: true
  register: _yaml_result

- name: Track changes
  ansible.builtin.set_fact:
    changed: '{{ changed | default(false) or _yaml_result.changed }}'