---
- name: Deploy Prometheus
  hosts: ubuntu
  become: true
  tasks:
  - name: Check if host has prometheus service
    ansible.builtin.set_fact:
      has_prometheus_service: "{{'prometheus' in services}}"

  - name: Skip hosts without prometheus service
    ansible.builtin.meta: end_host
    when: not has_prometheus_service

  - name: Install Prometheus
    ansible.builtin.apt:
      name: prometheus
      state: present
      update_cache: true

  - name: Fix Prometheus directory permissions
    ansible.builtin.file:
      path: /var/lib/prometheus
      owner: prometheus
      group: prometheus
      mode: '750'
      recurse: true

  - name: Create textfile collector directory
    ansible.builtin.file:
      path: /var/lib/prometheus/node-exporter
      state: directory
      owner: prometheus
      group: prometheus
      mode: '750'

  - name: Template prometheus.yml to Prospero
    ansible.builtin.template:
      src: prometheus.yml.j2
      dest: /etc/prometheus/prometheus.yml
      owner: prometheus
      group: prometheus
      mode: '640'
    notify: restart prometheus

  - name: Template alert_rules.yml to Prospero
    ansible.builtin.template:
      src: alert_rules.yml.j2
      dest: /etc/prometheus/alert_rules.yml
      owner: prometheus
      group: prometheus
      mode: '640'
    notify: restart prometheus

  - name: Create Prometheus systemd override directory
    ansible.builtin.file:
      path: /etc/systemd/system/prometheus.service.d
      state: directory
      mode: '755'

  - name: Enable remote write receiver
    ansible.builtin.copy:
      content: |
        [Service]
        ExecStart=
        ExecStart=/usr/bin/prometheus --config.file=/etc/prometheus/prometheus.yml --storage.tsdb.path=/var/lib/prometheus/metrics2/ --web.console.templates=/etc/prometheus/consoles --web.console.libraries=/etc/prometheus/console_libraries --web.listen-address=0.0.0.0:9090 --web.external-url= --web.enable-remote-write-receiver
      dest: /etc/systemd/system/prometheus.service.d/override.conf
      mode: '644'
    notify: restart prometheus

  - name: Start and enable Prometheus service
    ansible.builtin.systemd:
      name: prometheus
      state: started
      enabled: true
      daemon_reload: true
      
  handlers:
  - name: restart prometheus
    ansible.builtin.systemd:
      name: prometheus
      state: restarted
      daemon_reload: true