---
- name: Install required packages
  apt:
    name:
      - wget
      - tar
    state: present
    update_cache: yes
  tags: postgres_exporter

- name: Create postgres_exporter user
  user:
    name: postgres_exporter
    system: yes
    shell: /bin/false
    home: /nonexistent
    comment: "Postgres Exporter Service User"
  tags: postgres_exporter

- name: Download Postgres Exporter
  get_url:
    url: "https://github.com/prometheus-community/postgres_exporter/releases/download/v{{ postgres_exporter_version }}/postgres_exporter-{{ postgres_exporter_version }}.linux-amd64.tar.gz"
    dest: "/tmp/postgres_exporter-{{ postgres_exporter_version }}.tar.gz"
    timeout: 30
    validate_certs: no
  tags: postgres_exporter

- name: Extract Postgres Exporter
  unarchive:
    src: "/tmp/postgres_exporter-{{ postgres_exporter_version }}.tar.gz"
    dest: "/tmp/"
    remote_src: yes
    creates: "/tmp/postgres_exporter-{{ postgres_exporter_version }}.linux-amd64"
  tags: postgres_exporter

- name: Install Postgres Exporter binary
  copy:
    src: "/tmp/postgres_exporter-{{ postgres_exporter_version }}.linux-amd64/postgres_exporter"
    dest: "/usr/local/bin/postgres_exporter"
    owner: postgres_exporter
    group: postgres_exporter
    mode: '0755'
    remote_src: yes
  tags: postgres_exporter

- name: Create systemd service
  template:
    src: postgres_exporter.service.j2
    dest: /etc/systemd/system/{{ postgres_exporter_service_name }}.service
    owner: root
    group: root
    mode: '0644'
  tags: postgres_exporter

- name: Clean up temp files
  file:
    path: "/tmp/postgres_exporter-{{ postgres_exporter_version }}.tar.gz"
    state: absent
  tags: postgres_exporter

- name: Clean up extracted directory
  file:
    path: "/tmp/postgres_exporter-{{ postgres_exporter_version }}.linux-amd64"
    state: absent
  tags: postgres_exporter

- name: Reload systemd
  systemd:
    daemon_reload: yes
  tags: postgres_exporter

- name: Enable and start Postgres Exporter
  systemd:
    name: "{{ postgres_exporter_service_name }}"
    enabled: yes
    state: started
    daemon_reload: yes
  tags: postgres_exporter

- name: Configure UFW for Postgres Exporter
  ufw:
    rule: allow
    port: "{{ postgres_exporter_port }}"
    proto: tcp
    comment: "Postgres Exporter metrics"
  tags: postgres_exporter

- name: Verify Postgres Exporter is running
  wait_for:
    port: "{{ postgres_exporter_port }}"
    host: "{{ ansible_host }}"
    delay: 3
    timeout: 60
  tags: postgres_exporter