---
# Converges one stack (one loop iteration of `stack` from playbooks/unraid.yml)
# to the state its host_vars entry asks for.
#
# `state: present` (the default) deploys; `state: absent` tears down. Removal
# has to be asked for explicitly because Ansible keeps no record of what it
# deployed last run — deleting a stack from a host's `stacks:` list only stops
# the loop visiting it, leaving the containers running and unmanaged on the
# host forever. So the entry stays put as a tombstone, with `state: absent`,
# until the teardown has actually been applied.
#
# Unraid-only by design. Proxmox guests install apps natively rather than as
# Compose stacks — see the `lxc_app` role.

- name: Set stack facts
  ansible.builtin.set_fact:
    stack_local_dir: "{{ repo_root }}/src/{{ stack.src }}"
    stack_remote_dir: "{{ compose_projects_root }}/{{ stack.name }}"
    stack_state: "{{ stack.state | default('present') }}"

- name: Validate requested stack state
  ansible.builtin.assert:
    that: stack_state in ['present', 'absent']
    fail_msg: >-
      Stack '{{ stack.name }}' has state '{{ stack_state }}'; expected
      'present' or 'absent'.
    quiet: true

# Which icons this stack ships, worked out from the repo checkout on the
# controller rather than from anything on the host — `is exists` and the
# `fileglob` lookup both evaluate locally. Computed here rather than in
# deploy.yml because both branches need it: deploy copies these files out,
# remove deletes them again.
#
# Two naming conventions, because Unraid has two icon consumers (see
# deploy.yml for the full explanation):
#
#   icon.png            the stack — Compose Manager's project row, plus the
#                       `net.unraid.docker.icon` label of whichever service
#                       interpolates ${STACK_ICON}.
#   icon-<service>.png  one container — becomes ${STACK_ICON_<SERVICE>}, so a
#                       multi-container stack can label each of its services
#                       with its own image instead of sharing the stack's.
#
# `<service>` is the compose service name; the variable is it uppercased with
# `-` folded to `_` (icon-shelfarr-libation.png → STACK_ICON_SHELFARR_LIBATION).
- name: Set stack icon facts
  ansible.builtin.set_fact:
    # Empty when the stack ships no icon.png — an empty label is what the
    # webgui already assumes, so it falls back to the placeholder as before.
    stack_icon_dest: >-
      {{ ((stack_local_dir ~ '/ansible/unraid/icon.png') is exists)
         | ternary(unraid_icons_root ~ '/' ~ stack.name ~ '.png', '') }}
    stack_service_icon_names: "{{ _service_icon_names }}"
    stack_service_icons: >-
      {{ dict(_service_icon_names
              | map('upper') | map('replace', '-', '_')
              | map('regex_replace', '^(.+)$', 'STACK_ICON_\1')
              | zip(_service_icon_names
                    | map('regex_replace', '^(.+)$',
                          unraid_icons_root ~ '/' ~ stack.name ~ '-\1.png'))) }}
  vars:
    _service_icon_names: >-
      {{ query('fileglob', stack_local_dir ~ '/ansible/unraid/icon-*.png')
         | map('basename')
         | map('regex_replace', '^icon-(.+)\.png$', '\1')
         | map('lower') | list }}

- name: Deploy stack
  ansible.builtin.include_tasks: deploy.yml
  when: stack_state == 'present'

- name: Remove stack
  ansible.builtin.include_tasks: remove.yml
  when: stack_state == 'absent'