---
- name: Install ZFS userland + kernel module
  ansible.builtin.apt:
    name: zfsutils-linux
    state: present

- name: Ensure the ZFS kernel module is loaded
  community.general.modprobe:
    name: zfs
    state: present

# --- Pool creation (guarded & destructive) ----------------------------------
- name: Check whether the ZFS pool already exists
  ansible.builtin.command: "zpool list -H -o name {{ zfs_pool_name }}"
  register: zpool_check
  changed_when: false
  failed_when: false

- name: Record pool existence
  ansible.builtin.set_fact:
    zpool_exists: "{{ zpool_check.rc == 0 }}"

- name: Probe the target disk for existing data
  ansible.builtin.command: "lsblk -nro FSTYPE,MOUNTPOINT,PARTTYPE {{ zfs_pool_disk }}"
  register: disk_probe
  changed_when: false
  when: not zpool_exists

- name: Refuse to create a pool on a non-empty disk unless forced
  ansible.builtin.assert:
    that:
      - (disk_probe.stdout | trim | length == 0) or zfs_pool_force
    fail_msg: >-
      {{ zfs_pool_disk }} appears to already contain data
      ({{ disk_probe.stdout | trim }}). Refusing to create the pool. Verify you
      picked the right disk, then set zfs_pool_force=true to override.
  when: not zpool_exists

- name: Create the ZFS pool on the dedicated disk
  ansible.builtin.command: >-
    zpool create {{ '-f ' if zfs_pool_force else '' }}-o ashift=12
    -O compression={{ zfs_compression }}
    -O atime=off
    -O xattr=sa
    -O acltype=posixacl
    -O mountpoint=/{{ zfs_pool_name }}
    {{ zfs_pool_name }} {{ zfs_pool_disk }}
  when: not zpool_exists

# --- Datasets ---------------------------------------------------------------
- name: List existing datasets
  ansible.builtin.command: "zfs list -H -o name"
  register: zfs_existing
  changed_when: false

- name: Create platform + customers datasets
  ansible.builtin.command: >-
    zfs create -p
    {% if item.mountpoint is defined %}-o mountpoint={{ item.mountpoint }}{% endif %}
    {{ zfs_pool_name }}/{{ item.path }}
  loop: "{{ zfs_child_datasets }}"
  loop_control:
    label: "{{ zfs_pool_name }}/{{ item.path }}"
  when: (zfs_pool_name ~ '/' ~ item.path) not in zfs_existing.stdout_lines