---
# The user, the directories, and the binary.

- name: Install Navidrome's runtime dependencies
  apt:
    name:
      # Navidrome shells out to ffmpeg for on-the-fly transcoding. Without it
      # the server starts fine and every format the client cannot play natively
      # simply fails, which looks like a client bug.
      - ffmpeg
      - curl
    state: present
    update_cache: true

- name: Create the navidrome system group
  group:
    name: "{{ navidrome_group }}"
    system: yes
    state: present

- name: Create the navidrome system user
  user:
    name: "{{ navidrome_user }}"
    group: "{{ navidrome_group }}"
    system: yes
    shell: /usr/sbin/nologin
    home: "{{ navidrome_data_dir }}"
    create_home: no
    comment: "Navidrome Music Server"
    state: present

- name: Create the navidrome data directory
  ansible.builtin.file:
    path: "{{ navidrome_data_dir }}"
    state: directory
    owner: "{{ navidrome_user }}"
    group: "{{ navidrome_group }}"
    mode: '0750'

- name: Create the navidrome config directory
  ansible.builtin.file:
    path: "{{ navidrome_config_dir }}"
    state: directory
    owner: root
    group: "{{ navidrome_group }}"
    mode: '0750'

# Two principals share this tree and neither is root: the curator writes it
# through beets, Navidrome only reads it. setgid (the 2) is load-bearing -
# without it, files beets creates land in the curator's own group and Navidrome
# cannot read them, which presents as an empty library rather than an error.
- name: Create the music library directory
  ansible.builtin.file:
    path: "{{ navidrome_music_dir }}"
    state: directory
    owner: "{{ navidrome_curator_user }}"
    group: "{{ navidrome_group }}"
    mode: '2750'

- name: Create the incoming staging directory
  ansible.builtin.file:
    path: "{{ navidrome_incoming_dir }}"
    state: directory
    owner: "{{ navidrome_curator_user }}"
    group: "{{ navidrome_curator_user }}"
    mode: '0755'

# check_mode: no on the next two - this repo verifies with `--check --diff`, so
# the role has to survive a dry run. A read-only version probe and a temp
# directory are both harmless to perform for real, and without them every task
# below evaluates against an undefined navidrome_tmp.path and the check aborts.
- name: Check the installed navidrome version
  ansible.builtin.command: "{{ navidrome_bin_path }} --version"
  register: navidrome_installed_version
  changed_when: false
  failed_when: false
  check_mode: no

- name: Decide whether navidrome needs installing
  ansible.builtin.set_fact:
    navidrome_needs_install: "{{ navidrome_version not in (navidrome_installed_version.stdout | default('')) }}"

- name: Create a temporary directory for the navidrome download
  ansible.builtin.tempfile:
    state: directory
    suffix: navidrome
  register: navidrome_tmp
  when: navidrome_needs_install | bool
  check_mode: no

# checksum: is the verification. Upstream publishes navidrome_checksums.txt per
# release but signs nothing, so there is no signature to check the way
# roles/monero checks binaryfate's - this pins the exact artefact and no more.
- name: Download the navidrome release tarball
  ansible.builtin.get_url:
    url: "{{ navidrome_url }}"
    dest: "{{ navidrome_tmp.path }}/navidrome.tar.gz"
    checksum: "sha256:{{ navidrome_sha256 }}"
    mode: '0644'
  when: navidrome_needs_install | bool and not ansible_check_mode

- name: Unpack the navidrome tarball
  ansible.builtin.unarchive:
    src: "{{ navidrome_tmp.path }}/navidrome.tar.gz"
    dest: "{{ navidrome_tmp.path }}"
    remote_src: yes
  when: navidrome_needs_install | bool and not ansible_check_mode

- name: Install the navidrome binary
  ansible.builtin.copy:
    src: "{{ navidrome_tmp.path }}/navidrome"
    dest: "{{ navidrome_bin_path }}"
    remote_src: yes
    owner: root
    group: root
    mode: '0755'
  when: navidrome_needs_install | bool and not ansible_check_mode
  notify: Restart navidrome

- name: Remove the navidrome download directory
  ansible.builtin.file:
    path: "{{ navidrome_tmp.path }}"
    state: absent
  when: navidrome_needs_install | bool
  check_mode: no

# Check mode skips the three tasks above, so without this a dry run is silent
# about the single most important thing it would do.
- name: Report what a real run would install
  ansible.builtin.debug:
    msg: >-
      Would install navidrome {{ navidrome_version }} to {{ navidrome_bin_path }}
      (currently: {{ navidrome_installed_version.stdout | default('not installed') | trim }})
  when: navidrome_needs_install | bool and ansible_check_mode