---
- name: "Include OS-specific variables"
  ansible.builtin.include_vars: "{{ ansible_os_family | lower }}.yml"

- name: "Create prometheus group"
  become: true
  ansible.builtin.group:
    name: "prometheus"
    system: true

- name: "Create prometheus user"
  become: true
  ansible.builtin.user:
    name: "prometheus"
    group: "prometheus"
    system: true
    shell: "/usr/sbin/nologin"
    create_home: false

- name: "Create prometheus directories"
  become: true
  ansible.builtin.file:
    path: "{{ item }}"
    state: "directory"
    owner: "prometheus"
    group: "prometheus"
    mode: "0755"
  loop:
    - "/etc/prometheus"
    - "/var/lib/prometheus"

- name: "Install prometheus packages"
  become: true
  ansible.builtin.package:
    name:
      - "prometheus"
      - "prometheus-node-exporter"
    state: "present"

- name: "Create prometheus configuration"
  become: true
  ansible.builtin.template:
    src: "prometheus.yml.j2"
    dest: "/etc/prometheus/prometheus.yml"
    owner: "prometheus"
    group: "prometheus"
    mode: "0644"
  notify: "Restart prometheus"

# NOTE: show systemd configurations using: systemctl cat prometheus
- name: "Configure prometheus host/port via environment file"
  become: true
  ansible.builtin.copy:
    content: |
      PROMETHEUS_ARGS="--web.listen-address={{ prometheus_host }}:{{ prometheus_port }}"
    dest: "{{ prometheus_env_file }}"
    mode: "0644"
  notify: "Restart prometheus"

# NOTE: show systemd configurations using: systemctl cat prometheus-node-exporter
- name: "Configure node-exporter host/port via environment file"
  become: true
  ansible.builtin.copy:
    content: |
      NODE_EXPORTER_ARGS="
        --web.listen-address={{ prometheus_host }}:{{ prometheus_node_exporter_port }}
        --collector.systemd
      "
    dest: "{{ prometheus_node_exporter_env_file }}"
    mode: "0644"
  notify: "Restart node-exporter"

- name: "Start and enable prometheus services"
  become: true
  ansible.builtin.systemd_service:
    name: "{{ item }}"
    state: "started"
    enabled: true
  loop:
    - "prometheus"
    - "prometheus-node-exporter"