- name: Add the bc250-cachyos pacman repository
  become: true
  ansible.builtin.blockinfile:
    path: /etc/pacman.conf
    marker: "# {mark} - Ansible managed"
    prepend_newline: true
    block: |
      [bc250-cachyos]
      SigLevel = Optional TrustAll
      Server = https://github.com/MastaG/linux-cachyos-bc250/releases/download/repo
  register: pacman_repo

# Full upgrade first: installing from a freshly added repo without -Syu
# would be a partial upgrade.
- name: Perform a full system upgrade
  become: true
  community.general.pacman:
    update_cache: "{{ pacman_repo.changed }}"
    upgrade: true
  register: sys_upgrade

- name: Give the BC-250 kernel priority in BOOT_ORDER
  become: true
  ansible.builtin.lineinfile:
    path: /etc/default/limine
    regexp: '^BOOT_ORDER='
    line: 'BOOT_ORDER="*bc250, *lts, *, *fallback, Snapshots"'
  register: boot_order

- name: Install the BC-250 kernel and the fallback
  become: true
  community.general.pacman:
    name:
      - linux-cachyos-bc250
      - linux-cachyos-bc250-headers
      - linux-cachyos
      - linux-cachyos-headers
    state: present
  register: kernel_pkg

- name: Regenerate Limine entries when only BOOT_ORDER changed
  become: true
  ansible.builtin.command: limine-mkinitcpio
  when: boot_order.changed and not kernel_pkg.changed
  changed_when: true

- name: Preselect the BC-250 kernel for the next boot
  become: true
  ansible.builtin.shell:
    executable: /bin/bash
    cmd: |
      set -eu
      EFIVAR=$(ls /sys/firmware/efi/efivars/LimineLastBootedEntry-*)
      [ "$(tail -c +5 "$EFIVAR" | tr -d '\0')" = 'CachyOS/linux-cachyos-bc250' ] && exit 90
      chattr -i "$EFIVAR"
      printf '\x07\x00\x00\x00CachyOS/linux-cachyos-bc250\x00' > "$EFIVAR"
  register: efivar_write
  changed_when: efivar_write.rc == 0
  failed_when: efivar_write.rc not in [0, 90]

- name: Reboot into the new kernel
  become: true
  ansible.builtin.reboot:
    reboot_timeout: 600
  when: kernel_pkg.changed or boot_order.changed or sys_upgrade.changed

- name: Re-gather kernel facts after reboot
  ansible.builtin.setup:
    filter: ansible_kernel

# Guards the removal below: never drop deckify unless we are already
# running the BC-250 kernel.
- name: Make sure the BC-250 kernel is the running one
  ansible.builtin.assert:
    that: "'bc250' in ansible_kernel"
    fail_msg: "Running {{ ansible_kernel }}"

- name: Remove the deckify kernel
  become: true
  community.general.pacman:
    name:
      - linux-cachyos-deckify
      - linux-cachyos-deckify-headers
    state: absent