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

- name: Check if Prometheus is installed
  ansible.builtin.stat:
    path: /usr/local/bin/prometheus
  register: prometheus_binary

- name: Get installed Prometheus version
  ansible.builtin.command: /usr/local/bin/prometheus --version
  register: prometheus_installed_version
  changed_when: false
  failed_when: false
  when: prometheus_binary.stat.exists

- name: Download Prometheus
  ansible.builtin.get_url:
    url: "https://github.com/prometheus/prometheus/releases/download/v{{ prometheus_version }}/prometheus-{{ prometheus_version }}.linux-{{ go_arch }}.tar.gz"
    dest: "/tmp/prometheus-{{ prometheus_version }}.tar.gz"
    mode: "0644"
  when: not prometheus_binary.stat.exists or prometheus_version not in (prometheus_installed_version.stdout | default(''))

- name: Extract Prometheus
  ansible.builtin.unarchive:
    src: "/tmp/prometheus-{{ prometheus_version }}.tar.gz"
    dest: /tmp
    remote_src: true
  when: not prometheus_binary.stat.exists or prometheus_version not in (prometheus_installed_version.stdout | default(''))

- name: Install Prometheus binaries
  ansible.builtin.copy:
    src: "/tmp/prometheus-{{ prometheus_version }}.linux-{{ go_arch }}/{{ item }}"
    dest: "/usr/local/bin/{{ item }}"
    mode: "0755"
    remote_src: true
  loop:
    - prometheus
    - promtool
  notify: Restart prometheus
  when: not prometheus_binary.stat.exists or prometheus_version not in (prometheus_installed_version.stdout | default(''))

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

- name: Deploy Prometheus systemd service
  ansible.builtin.template:
    src: prometheus.service.j2
    dest: /etc/systemd/system/prometheus.service
    mode: "0644"
  notify:
    - Reload systemd
    - Restart prometheus

- name: Enable and start Prometheus
  ansible.builtin.systemd:
    name: prometheus
    enabled: true
    state: started
    daemon_reload: true

- name: Clean up downloaded files
  ansible.builtin.file:
    path: "{{ item }}"
    state: absent
  loop:
    - "/tmp/prometheus-{{ prometheus_version }}.tar.gz"
    - "/tmp/prometheus-{{ prometheus_version }}.linux-{{ go_arch }}"