---
- name: Install Prometheus and Grafana on control node
  hosts: prometheus_server
  become: true
  # vars_files:
  #   - vars.yml
  tasks:
    - name: Install prerequisite software
      ansible.builtin.dnf:
        name: 
          - tar
          - wget
        state: present

    - name: Download Prometheus
      ansible.builtin.get_url:
        url: "{{ prometheus_installer_download_url }}"
        dest: "/tmp/{{ prometheus_installer_file }}"

    - name: Extract Prometheus
      ansible.builtin.unarchive:
        src: "/tmp/{{ prometheus_installer_file }}"
        dest: "/usr/local/bin/"
        remote_src: true

    - name: Create Prometheus user
      user:
        name: prometheus
        shell: /bin/false
        state: present

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

    - name: Move Prometheus binaries
      ansible.builtin.command: "mv /usr/local/bin/prometheus-{{ prometheus_version }}.linux-amd64/prometheus /usr/local/bin/prometheus"

    - name: Move Prometheus tool
      ansible.builtin.command: "mv /usr/local/bin/prometheus-{{ prometheus_version }}.linux-amd64/promtool /usr/local/bin/promtool"

    - name: Create Prometheus configuration file
      ansible.builtin.copy:
        dest: "/etc/prometheus/prometheus.yml"
        content: |
          global:
            scrape_interval: 15s
            evaluation_interval: 15s

          scrape_configs:
            - job_name: 'prometheus'
              static_configs:
                - targets: ['localhost:9090']

            - job_name: 'nodes'
              static_configs:
                - targets:
                  {% for ip in prometheus_nodes %}
                  - '{{ ip }}:9100'
                  {% endfor %}

    - name: Create Prometheus service file
      ansible.builtin.copy:
        dest: "/etc/systemd/system/prometheus.service"
        content: |
          [Unit]
          Description=Prometheus
          Wants=network-online.target
          After=network-online.target

          [Service]
          User=prometheus
          Group=prometheus
          Type=simple
          ExecStart=/usr/local/bin/prometheus \
            --config.file=/etc/prometheus/prometheus.yml \
            --storage.tsdb.path=/var/lib/prometheus/ \
            --web.console.templates=/etc/prometheus/consoles \
            --web.console.libraries=/etc/prometheus/console_libraries

          [Install]
          WantedBy=multi-user.target

      register: prometheus_service_status
      ignore_errors: true

    - name: Check if Prometheus service is running
      ansible.builtin.command: systemctl is-active prometheus
      register: prometheus_status
      changed_when: false
      ignore_errors: true

    - name: Permit prometheus endpoint in default zone for dns service
      firewalld:
        port: 9090/tcp
        permanent: true
        immediate: true
        state: enabled

    - name: Permit prometheus metrics in default zone for dns service
      firewalld:
        port: 9100/tcp
        permanent: true
        immediate: true
        state: enabled

    - name: Permit grafana traffic in default zone for dns service
      firewalld:
        port: 3000/tcp
        permanent: true
        immediate: true
        state: enabled

    - name: Manage Prometheus service state
      systemd:
        name: prometheus
        state: "{{ 'restarted' if prometheus_status.rc == 0 else 'started' }}"
        enabled: true

    - name: Add repository
      ansible.builtin.yum_repository:
        name: grafana
        description: Grafana OSS repo
        baseurl: https://rpm.grafana.com
        gpgkey: https://rpm.grafana.com/gpg.key

    - name: Install Grafana
      ansible.builtin.dnf:
        name: 
          - grafana
        state: present

    - name: Start Grafana service
      systemd:
        name: grafana-server
        state: started
        enabled: true