---
- name: Ensure backup rules contains the necessary fields
  ansible.builtin.fail:
    msg: "You must define {{ backup_rule_checker }} in the backup ruleset"
  when: not mysql_backup_rules[backup_rule_checker] is defined
  loop:
    - target
    - target_port
    - target_username
    - target_password
    - database_name
    - backup_dir
    - backup_name_prefix
    - max_backups_kept
  loop_control:
    loop_var: backup_rule_checker

- name: Ensure necessary packages are installed
  ansible.builtin.package:
    name:
      - "python3-PyMySQL"
      - "mysql_community_client"
    state: present

- name: Make sure backup dir exists
  ansible.builtin.file:
    path: "{{ mysql_backup_rules['backup_dir'] }}"
    state: directory
    recurse: true

- name: Take a backup of the specified database
  ansible.mysql.mysql_db:
    name: "{{ mysql_backup_rules['database_name'] }}"
    state: dump
    target: "{{ mysql_backup_rules['backup_dir'] }}/{{ mysql_backup_rules['backup_name_prefix'] }}_{{ now().strftime('%Y%m%d%H%M%S') }}.sql.gz"
    login_host: "{{ mysql_backup_rules['target'] }}"
    login_port: "{{ mysql_backup_rules['target_port'] }}"
    login_user: "{{ mysql_backup_rules['target_username'] }}"
    login_password: "{{ mysql_backup_rules['target_password'] }}"

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

- name: If too many backups kept
  when: all_backup_files.files | length > mysql_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 - mysql_backup_rules.max_backups_kept] |
              map(attribute='path') | list }}
      
    - name: Remove the files
      ansible.builtin.file:
        path: "{{ old_file_to_delete }}"
        state: absent
      loop: "{{ oldest_file_paths }}"
      loop_control:
        loop_var: old_file_to_delete