---
# The menu app as a rootless Podman Quadlet unit.
#
# Everything here runs as {{ podman_user }} — the connection user. No become, no
# XDG_RUNTIME_DIR: the SSH connection gives a real PAM session, so systemd's
# user manager is reachable through the standard environment.

# The registry is private, so the pull below has to be authenticated. Podman
# keeps the credential in the user's own auth file; it is removed again at the
# end of this role, so nothing but the image is left behind. Skipped when no
# credentials are configured.
- name: Log in to the private registry
  ansible.builtin.command:
    cmd: 'podman login --username {{ registry_username }} --password-stdin {{ registry }}'
    stdin: '{{ registry_password }}'
  no_log: true
  changed_when: false
  when:
    - registry_username | length > 0
    - registry_password | length > 0

# Pulled here rather than left to the unit: Quadlet only pulls when the image is
# missing, and at that point the service has no registry credential to offer.
- name: Pull the menu app image
  ansible.builtin.command: 'podman pull {{ image }}'
  changed_when: false

# The data directory is created here rather than left to the image. Under
# keep-id the image's own root phase maps to a subuid, so anything it tries to
# create under the mount fails with EPERM; the directory has to exist already,
# owned by {{ podman_user }}.
- name: Ensure the app root exists
  ansible.builtin.file:
    path: '{{ host_directory }}'
    state: directory
    owner: '{{ podman_user }}'
    group: '{{ podman_user }}'
    mode: '0750'

# MENU_ROOT is the app root, and the app keeps its content one level down in
# data/ (originals/, drafts/, published/, site.json, sections.json).
- name: Ensure the data directory exists
  ansible.builtin.file:
    path: '{{ host_directory }}/data'
    state: directory
    owner: '{{ podman_user }}'
    group: '{{ podman_user }}'
    mode: '0750'

- name: Look for the untracked site.env
  ansible.builtin.stat:
    path: '{{ host_directory }}/site.env'
  register: menu_site_env

- name: Warn when the admin has no password yet
  ansible.builtin.debug:
    msg: >-
      {{ host_directory }}/site.env is missing, so the admin is disabled: the
      public menu still serves. Run scripts/provision-site-env.sh
      {{ host_directory }} on this host, then re-run this playbook.
  when: not menu_site_env.stat.exists

- name: Keep site.env readable only by the app user
  ansible.builtin.file:
    path: '{{ host_directory }}/site.env'
    owner: '{{ podman_user }}'
    group: '{{ podman_user }}'
    mode: '0600'
  when: menu_site_env.stat.exists

- name: Install the menu app Quadlet unit
  ansible.builtin.template:
    src: menu-app.container.j2
    dest: '{{ quadlet_dir }}/{{ container_name }}.container'
    owner: '{{ podman_user }}'
    group: '{{ podman_user }}'
    mode: '0644'
  notify:
    - Reload systemd user units
    - Restart the menu app

- name: Start the menu app
  block:
    - name: Start the menu app
      ansible.builtin.systemd_service:
        name: '{{ unit_name }}'
        scope: user
        state: started
        daemon_reload: true
  rescue:
    # systemd reports "control process exited with error code" and nothing else,
    # which is useless for the usual failures (a missing image, an unattached
    # network, an unwritable data directory). Pull the real reason out.
    - name: Collect diagnostics
      ansible.builtin.command: '{{ item }}'
      loop:
        - 'systemctl --user status {{ unit_name }} --no-pager'
        - 'journalctl --user -u {{ unit_name }} --no-pager -n 60'
        - 'podman logs --tail 60 {{ container_name }}'
      register: menu_diagnostics
      changed_when: false
      failed_when: false

    - name: Show diagnostics
      ansible.builtin.debug:
        msg: '{{ menu_diagnostics.results | map(attribute="stdout") | list }}'

    - name: Fail
      ansible.builtin.fail:
        msg: 'The menu app did not start — see the diagnostics above.'

# The unit template notifies "Restart the menu app", but handlers otherwise run
# at the very end of the play — after the healthcheck gate below. Flush them
# here so the gate tests the container that has the current HealthCmd; without
# this, a run that only changes the unit would check the stale container and
# fail. On a run where nothing changed, no handler is pending and this is a
# no-op.
- name: Apply pending unit changes before verifying
  ansible.builtin.meta: flush_handlers

# Quadlet honours [Install] WantedBy= when it generates the unit, so
# `systemctl --user enable` is neither needed nor possible on a generated unit.
- name: Verify the menu app unit is active
  ansible.builtin.command: 'systemctl --user is-active {{ unit_name }}'
  register: menu_active
  changed_when: false
  failed_when: menu_active.stdout != 'active'

# `is-active` says the container is running; it does not say the app can serve.
# Restart=always means even a crash-looping container is reported active — which
# is what a fatal integrity problem in the data directory produces. The unit
# declares the health check, so run that once, synchronously.
- name: Wait for the container healthcheck to pass
  ansible.builtin.command: 'podman healthcheck run {{ container_name }}'
  register: menu_health
  until: menu_health.rc == 0
  retries: 36
  delay: 5
  changed_when: false
  failed_when: false

- name: Report a container that never answered
  when: menu_health.rc != 0
  block:
    - name: Collect diagnostics
      ansible.builtin.command: '{{ item }}'
      loop:
        - 'systemctl --user status {{ unit_name }} --no-pager'
        - 'journalctl --user -u {{ unit_name }} --no-pager -n 60'
        - 'podman logs --tail 60 {{ container_name }}'
      register: menu_health_diagnostics
      changed_when: false
      failed_when: false

    - name: Show diagnostics
      ansible.builtin.debug:
        msg: '{{ menu_health_diagnostics.results | map(attribute="stdout") | list }}'

    - name: Fail
      ansible.builtin.fail:
        msg: >-
          {{ container_name }} did not pass its health check within three
          minutes. Its logs are above, and: podman logs {{ container_name }}

- name: Check the data directory for integrity problems
  # Reads the same directory the container writes, as the same user, so a
  # permissions mistake shows up here rather than at 8pm service.
  ansible.builtin.command:
    argv:
      - podman
      - exec
      - --env
      - MENU_ROOT=/data
      - --env
      - 'MENU_SITE_CONFIG=/app/config/{{ site }}.site.json'
      - '{{ container_name }}'
      - node
      - src/cli/verify.ts
  register: menu_verify
  changed_when: false
  failed_when: false

- name: Report integrity problems
  ansible.builtin.debug:
    msg: '{{ menu_verify.stdout_lines | default([]) }}'
  when: menu_verify.rc != 0

- name: Show the networks the container is attached to
  ansible.builtin.command: >-
    podman inspect {{ container_name }}
    --format '{% raw %}{{ range $k, $v := .NetworkSettings.Networks }}{{ $k }} {{ end }}{% endraw %}'
  register: menu_networks_now
  changed_when: false
  failed_when: false

- name: Report the network
  ansible.builtin.debug:
    msg: >-
      {{ container_name }} is on
      {{ menu_networks_now.stdout | default('(container not running)') }}

# Removes the credential from the user's auth file. The image is already local
# and the unit only pulls when it is missing, so this does not break restarts.
- name: Log out of the private registry
  ansible.builtin.command: 'podman logout {{ registry }}'
  changed_when: false
  failed_when: false
  when:
    - registry_username | length > 0
    - registry_password | length > 0