---
# Install node_exporter for Prometheus monitoring.
# Uses system packages on Linux, pkg on FreeBSD.
# Optionally binds to Tailscale IP on public-facing hosts.

# ── Cleanup old custom installs ──────────────────────────────
- name: Stop and disable custom node_exporter service if present
  ansible.builtin.service:
    name: node_exporter
    state: stopped
    enabled: false
  failed_when: false
  when: ansible_facts["os_family"] == "Debian"

- name: Remove custom node_exporter service file
  ansible.builtin.file:
    path: /etc/systemd/system/node_exporter.service
    state: absent
  when: ansible_facts["os_family"] == "Debian"
  notify: Reload systemd

- name: Remove custom node_exporter binary
  ansible.builtin.file:
    path: /usr/local/bin/node_exporter
    state: absent
  when: ansible_facts["os_family"] == "Debian"

# ── Install ──────────────────────────────────────────────────
- name: Install prometheus-node-exporter (Debian)
  ansible.builtin.apt:
    name: prometheus-node-exporter
    state: present
  when: ansible_facts["os_family"] == "Debian"

- name: Install prometheus-node-exporter (Alpine)
  community.general.apk:
    name: prometheus-node-exporter
    state: present
  when: ansible_facts["os_family"] == "Alpine"

# ── Configure (Debian) ──────────────────────────────────────
- name: Build ARGS for prometheus-node-exporter
  ansible.builtin.set_fact:
    _node_exporter_args: >-
      {{ (node_exporter_extra_collectors | map('regex_replace', '^(.*)$', '--collector.\1') | list)
         + (['--web.listen-address=' + ansible_host + ':9100'] if node_exporter_bind_tailscale | bool else []) }}
  when: ansible_facts["os_family"] == "Debian"

- name: Configure prometheus-node-exporter ARGS (Debian)
  ansible.builtin.lineinfile:
    path: /etc/default/prometheus-node-exporter
    regexp: '^ARGS='
    line: 'ARGS="{{ _node_exporter_args | join(" ") }}"'
  when:
    - ansible_facts["os_family"] == "Debian"
    - (_node_exporter_args | length > 0)
  notify: Restart node-exporter (Debian)

- name: Enable and start node-exporter (Debian)
  ansible.builtin.service:
    name: prometheus-node-exporter
    state: started
    enabled: true
  when: ansible_facts["os_family"] == "Debian"

- name: Enable and start node-exporter (Alpine)
  ansible.builtin.service:
    name: node-exporter
    state: started
    enabled: true
  when: ansible_facts["os_family"] == "Alpine"

# ── FreeBSD ──────────────────────────────────────────────────
- name: Install node_exporter (FreeBSD)
  community.general.pkgng:
    name: node_exporter
    state: present
  when: ansible_facts["os_family"] == "FreeBSD"

- name: Enable node_exporter (FreeBSD)
  ansible.builtin.lineinfile:
    path: /etc/rc.conf
    regexp: '^node_exporter_enable='
    line: 'node_exporter_enable="YES"'
  when: ansible_facts["os_family"] == "FreeBSD"

- name: Configure listen address (FreeBSD)
  ansible.builtin.lineinfile:
    path: /etc/rc.conf
    regexp: '^node_exporter_listen_address='
    line: 'node_exporter_listen_address="{{ ansible_host }}:9100"'
  when:
    - ansible_facts["os_family"] == "FreeBSD"
    - node_exporter_bind_tailscale | bool
  notify: Restart node_exporter (FreeBSD)

- name: Start node_exporter (FreeBSD)
  ansible.builtin.service:
    name: node_exporter
    state: started
  when: ansible_facts["os_family"] == "FreeBSD"