- name: Download and verify the prometheus archive
  get_url:
    url: "https://github.com/prometheus/prometheus/releases/download/v{{ prometheus_version }}/prometheus-{{ prometheus_version }}.linux-amd64.tar.gz"
    dest: "/tmp/prometheus-{{ prometheus_version }}.linux-amd64.tar.gz"
    checksum: "sha256:{{ prometheus_sha256 }}"
  register: download_result

- name: Unarchive prometheus binary
  unarchive:
    src: "{{ download_result.dest }}"
    dest: /tmp
    remote_src: true # Indicates the source file is on the remote host
    owner: root
    group: root
    mode: 0755

- name: Copy prometheus binary to /usr/local/bin
  copy:
    src: "/tmp/prometheus-{{ prometheus_version }}.linux-amd64/prometheus"
    dest: "/usr/local/bin/prometheus-{{ prometheus_version }}"
    owner: root
    group: root
    mode: '0755'
    remote_src: yes

- name: Create prometheus binary symlink
  file:
    src: "/usr/local/bin/prometheus-{{ prometheus_version }}"
    dest: "/usr/local/bin/prometheus"
    state: link
    owner: root
    group: root
    mode: '0755' # Permissions for the target file
    force: yes 

- name: Create a prometheus group
  group:
    name: prometheus
    state: present
    gid: 1051

- name: Create a prometheus user
  user:
    name: prometheus
    uid: 1051
    group: 1051
    comment: "prometheus user"
    shell: /bin/bash
    state: present
    create_home: no

- name: Create prometheus data and config directories
  file:
    path: "{{ item }}"
    state: directory
    mode: 0750
    owner: prometheus
    group: prometheus
  loop:
    - /var/lib/prometheus
    - /etc/prometheus

- name: Install prometheus config
  template:
    src: templates/prometheus.yml.j2
    dest: /etc/prometheus/prometheus.yml
    owner: prometheus
    group: prometheus
    mode: '0640'
  notify: Restart prometheus

- name: Install prometheus service
  template:
    src: templates/prometheus.service.j2
    dest: /etc/systemd/system/prometheus.service
    owner: root
    group: root
    mode: 0640
  register: prometheus_service
  notify: Restart prometheus

- name: systemctl daemon-reload to pickup prometheus service changes
  systemd_service:
    daemon_reload: true
  when: prometheus_service.changed
  notify: Restart prometheus

- name: Start and enable prometheus
  service:
    name: prometheus
    state: started
    enabled: true