---
- name: Roll back native MySQL delivery instance
  hosts: "{{ target_hosts }}"
  become: true
  gather_facts: false
  any_errors_fatal: true
  vars:
    mysql_instance: "{{ instance_name }}"
    mysql_data_disk: "{{ data_disk }}"
    mysql_base_dir: "{{ mysql_data_disk }}/mysql-delivery/{{ mysql_instance }}"
    mysql_install_dir: "/opt/mysql-delivery/{{ mysql_instance }}"
    mysql_config_file: "/etc/mysql/mysql-delivery/{{ mysql_instance }}.cnf"
    mysql_run_dir: "/run/mysql-delivery-{{ mysql_instance }}"

  pre_tasks:
    - name: Validate rollback target
      ansible.builtin.assert:
        that:
          - mysql_instance is match('^[a-z0-9][a-z0-9-]{0,62}$')
          - mysql_data_disk is match('^/')
          - mysql_data_disk != '/'
          - "'..' not in mysql_data_disk"
        fail_msg: "Rollback target is outside the native MySQL delivery layout"
        quiet: true

  tasks:
    - name: Stop the delivery instance when present
      ansible.builtin.systemd_service:
        name: "mysql-delivery@{{ mysql_instance }}.service"
        state: stopped
        enabled: false
      register: mysql_stop_result
      failed_when: false

    - name: Remove the instance systemd failure state
      ansible.builtin.command:
        argv:
          - systemctl
          - reset-failed
          - "mysql-delivery@{{ mysql_instance }}.service"
      changed_when: false
      failed_when: false

    - name: Remove the instance configuration
      ansible.builtin.file:
        path: "{{ mysql_config_file }}"
        state: absent

    - name: Remove instance-local binary links
      ansible.builtin.file:
        path: "{{ mysql_install_dir }}"
        state: absent

    - name: Remove the instance data and log tree
      ansible.builtin.file:
        path: "{{ mysql_base_dir }}"
        state: absent

    - name: Remove the instance runtime directory
      ansible.builtin.file:
        path: "{{ mysql_run_dir }}"
        state: absent

    - name: Confirm the instance artifacts are gone
      ansible.builtin.stat:
        path: "{{ item }}"
      loop:
        - "{{ mysql_config_file }}"
        - "{{ mysql_install_dir }}"
        - "{{ mysql_base_dir }}"
        - "{{ mysql_run_dir }}"
      register: mysql_rollback_artifacts

    - name: Assert that all instance artifacts are gone
      ansible.builtin.assert:
        that:
          - mysql_rollback_artifacts.results | selectattr('stat.exists') | list | length == 0
        fail_msg: "One or more MySQL delivery artifacts remain after rollback"
        quiet: true