---
# 1. This part runs on EVERY node
- name: Install Node Exporter (Agent)
  ansible.builtin.apt:
    name: prometheus-node-exporter
    state: present

- name: Ensure Node Exporter is running
  ansible.builtin.systemd:
    name: prometheus-node-exporter
    state: started
    enabled: yes

# 2. This part ONLY runs on the monitor node
- name: Install Monitoring Server Stack
  when: inventory_hostname == 'monitor'
  block:
    - name: Add Grafana GPG key
      ansible.builtin.get_url:
        url: https://apt.grafana.com/gpg.key
        dest: /usr/share/keyrings/grafana.gpg
        mode: '0644'

    - name: Add Grafana Repo
      ansible.builtin.apt_repository:
        repo: "deb [signed-by=/usr/share/keyrings/grafana.gpg] https://apt.grafana.com stable main"
        state: present
    - name: Ensure prometheus system user exists
      ansible.builtin.user:
        name: prometheus
        shell: /bin/false
        system: yes
        create_home: no
      when: inventory_hostname == 'monitor'

    - name: Ensure prometheus data directory has correct permissions
      ansible.builtin.file:
        path: /var/lib/prometheus
        state: directory
        owner: prometheus
        group: prometheus
        mode: '0755'
      when: inventory_hostname == 'monitor'


    - name: Install Server Packages
      ansible.builtin.apt:
        name:
          - influxdb
          - grafana
          - prometheus  # The server engine
        state: present
        update_cache: yes

    - name: Deploy Prometheus configuration from template
      ansible.builtin.template:
        src: prometheus.yml.j2
        dest: /etc/prometheus/prometheus.yml
        owner: prometheus
        group: prometheus
        mode: '0644'
      notify: Restart Prometheus

    - name: Ensure Server Services are running
      ansible.builtin.systemd:
        name: "{{ item }}"
        state: started
        enabled: yes
      loop:
        - influxdb
        - grafana-server
        - prometheus

    - name: Configure InfluxDB UDP listener for Proxmox
      ansible.builtin.blockinfile:
        path: /etc/influxdb/influxdb.conf
        insertafter: '\[\[udp\]\]'
        block: |
          enabled = true
          bind-address = ":8089"
          database = "proxmox"
          batch-size = 1000
          batch-timeout = "1s"
      when: inventory_hostname == 'monitor'
      notify: Restart Influxdb