---
- name: Ensure backup rules contains the necessary fields
  ansible.builtin.fail:
    msg: "You must define {{ item }} in the backup ruleset"
  when: not backup_rules[item] is defined
  loop:
    - container_name
    - directories_to_backup
    - backup_dir
    - backup_name_prefix
    - max_backups_kept

- name: Stop the running container
  community.docker.docker_container:
    name: "{{ backup_rules.container_name }}"
    state: stopped

- name: Archive necessary directories
  community.general.archive:
    path: "{{ backup_rules.directories_to_backup }}"
    dest: >-
      {{ backup_rules.backup_dir }}/{{ backup_rules.backup_name_prefix }}_
      {{ now().strftime("%Y%m%d%H%M%S") }}.tar.gz
    format: gz
  async: 3600
  poll: 60

- name: Start the stopped container
  community.docker.docker_container:
    name: "{{ backup_rules.container_name }}"
    state: started

- name: Find all files that start with the backup_name_prefix
  ansible.builtin.find:
    paths: "{{ backup_rules.backup_dir }}"
    patterns: "{{ backup_rules.backup_name_prefix }}*"
  register: all_backup_files

- name: If too many backups kept
  when: all_backup_files.files | length > backup_rules.max_backups_kept
  block:
    - name: Get the oldest file paths
      ansible.builtin.set_fact:
        oldest_file_paths: >-
          {{ (all_backup_files.files | sort(attribute='mtime'))[:all_backup_files.files | length - backup_rules.max_backups_kept] |
              map(attribute=path) | list }}
      
    - name: Remove the files
      ansible.builtin.file:
        path: "{{ item }}"
        state: absent
      loop: "{{ oldest_file_paths }}"