---
- name: Validate current host is Debian
  ansible.builtin.assert:
    that:
      - ansible_facts.distribution == "Debian"
    fail_msg: "This role only supports Debian hosts."

- name: Validate expected source Debian major version
  ansible.builtin.assert:
    that:
      - ansible_facts.distribution_major_version == debian_upgrade_source_major_version
    fail_msg: >-
      Expected Debian {{ debian_upgrade_source_major_version }} before upgrade,
      found Debian {{ ansible_facts.distribution_major_version }}.
    success_msg: "Host is Debian {{ debian_upgrade_source_major_version }} and ready for upgrade."
  when: ansible_facts.distribution_major_version != debian_upgrade_target_major_version

- name: Update package cache on current release
  ansible.builtin.apt:
    update_cache: true
    cache_valid_time: 3600
  when: ansible_facts.distribution_major_version != debian_upgrade_target_major_version

- name: Upgrade installed packages before release change
  ansible.builtin.apt:
    upgrade: dist
    autoremove: true
    autoclean: true
  when: ansible_facts.distribution_major_version != debian_upgrade_target_major_version

- name: Check for classic apt sources list
  ansible.builtin.stat:
    path: "{{ debian_upgrade_sources_list_path }}"
  register: debian_upgrade_sources_list_stat
  when: ansible_facts.distribution_major_version != debian_upgrade_target_major_version

- name: Check for deb822 apt sources
  ansible.builtin.stat:
    path: "{{ debian_upgrade_deb822_sources_path }}"
  register: debian_upgrade_deb822_sources_stat
  when: ansible_facts.distribution_major_version != debian_upgrade_target_major_version

- name: Back up current apt sources
  ansible.builtin.copy:
    src: "{{ debian_upgrade_sources_list_path }}"
    dest: "{{ debian_upgrade_sources_backup_path }}"
    remote_src: true
    mode: "0644"
    force: false
  when:
    - ansible_facts.distribution_major_version != debian_upgrade_target_major_version
    - debian_upgrade_sources_list_stat.stat.exists

- name: Back up current deb822 apt sources
  ansible.builtin.copy:
    src: "{{ debian_upgrade_deb822_sources_path }}"
    dest: "{{ debian_upgrade_deb822_sources_backup_path }}"
    remote_src: true
    mode: "0644"
    force: false
  when:
    - ansible_facts.distribution_major_version != debian_upgrade_target_major_version
    - debian_upgrade_deb822_sources_stat.stat.exists

- name: Configure Debian target release classic apt sources
  ansible.builtin.template:
    src: sources.list.j2
    dest: "{{ debian_upgrade_sources_list_path }}"
    owner: root
    group: root
    mode: "0644"
  when:
    - ansible_facts.distribution_major_version != debian_upgrade_target_major_version
    - debian_upgrade_sources_list_stat.stat.exists or not debian_upgrade_deb822_sources_stat.stat.exists

- name: Configure Debian target release deb822 apt sources
  ansible.builtin.template:
    src: debian.sources.j2
    dest: "{{ debian_upgrade_deb822_sources_path }}"
    owner: root
    group: root
    mode: "0644"
  when:
    - ansible_facts.distribution_major_version != debian_upgrade_target_major_version
    - debian_upgrade_deb822_sources_stat.stat.exists

- name: Update package cache for target release
  ansible.builtin.apt:
    update_cache: true
  when: ansible_facts.distribution_major_version != debian_upgrade_target_major_version

- name: Perform Debian dist upgrade
  ansible.builtin.apt:
    upgrade: dist
    autoremove: true
    autoclean: true
    dpkg_options: force-confdef,force-confold
  environment:
    DEBIAN_FRONTEND: noninteractive
    APT_LISTCHANGES_FRONTEND: none
  notify: reboot_after_debian_dist_upgrade
  when: ansible_facts.distribution_major_version != debian_upgrade_target_major_version

- name: Flush reboot handler before verification
  ansible.builtin.meta: flush_handlers

- name: Gather facts after possible upgrade
  ansible.builtin.setup:

- name: Verify Debian target version
  ansible.builtin.assert:
    that:
      - ansible_facts.distribution == "Debian"
      - ansible_facts.distribution_major_version == debian_upgrade_target_major_version
    fail_msg: >-
      Debian upgrade did not finish as expected. Found
      {{ ansible_facts.distribution }} {{ ansible_facts.distribution_major_version }}.
    success_msg: "Host is running Debian {{ debian_upgrade_target_major_version }}."