{ config, pkgs, ... }:
let
  lokiHost = "192.168.1.174:3100";
in
{
  systemd.services.promtail.serviceConfig = {
    SupplementaryGroups = [ "docker" ];
  };

  environment.systemPackages = with pkgs; [
    (pkgs.writeShellScriptBin "promtail-check" "systemctl status promtail.service")
    (pkgs.writeShellScriptBin "promtail-watch" "journalctl -u promtail.service -b -n 25 -f")
  ];

  services.promtail = {
    enable = true;
    configuration = {
      server = {
        http_listen_port = 3031;
        grpc_listen_port = 0;
      };
      positions = {
        filename = "/tmp/positions.yaml";
      };
      clients = [{url = "http://${lokiHost}/loki/api/v1/push";}];
      scrape_configs = [
        {
          job_name = "journal";
          journal = {
            max_age = "24h";
            path = "/var/log/journal";
            json = true;
            # matches: _TRANSPORT=kernel;
            labels = {
              job = "systemd-journal";
              host = config.networking.hostName; # Dynamically fetch the hostname
            };
          };
          relabel_configs = [
            {
              source_labels = [ "__journal__systemd_unit" ];
              target_label = "unit";
            }
          ];
        }
        {
          job_name = "flog_scrape";
          docker_sd_configs = [
            {
              host = "unix:///var/run/docker.sock";
              refresh_interval = "5s";
            }
          ];
          relabel_configs = [
            {
              source_labels = [ "__meta_docker_container_name" ];
              regex = "/(.*)";
              target_label = "container";
            }
            {
              source_labels = [ "__meta_docker_container_label_com_docker_compose_oneoff" ];
              target_label = "oneoff";
            }
            {
              source_labels = [ "__meta_docker_container_label_com_docker_compose_project_config_files" ];
              target_label = "compose_file";
            }
            {
              source_labels = [ "__meta_docker_container_label_com_docker_compose_project" ];
              target_label = "project_name";
            }
            {
              source_labels = [ "__meta_docker_container_label_com_docker_compose_service" ];
              target_label = "service";
            }
            {
              target_label = "host";
              replacement = "${config.networking.hostName}";
            }
          ];
        }
      ];
    };
    # extraFlags
  };
}