{ pkgs, lib, config, ... }:
let
  inherit (lib) mkEnableOption mkPackageOption mkOption types mkIf;
  settingsFormatYaml = pkgs.formats.yaml { };
  cfg = config.services.pyroscope;
  configFile = settingsFormatYaml.generate "settings.yaml" cfg.settings;
in
{
  options.services.pyroscope = {
    enable = mkEnableOption "pyroscope, a continuous profiling platform";
    package = mkPackageOption pkgs "pyroscope" { };
    secretFile = mkOption {
      type = types.path;
    };
    settings = mkOption {
      description = "Pyroscope settings. See <>";

      type = types.submodule {
        freeformType = settingsFormatYaml.type;
      };
    };
  };

  config = mkIf cfg.enable {
    systemd.services.pyroscope = {
      description = "Pyroscope server - a continuous profiling platform";
      wantedBy = [ "multi-user.target" ];
      wants = [ "network-online.target" ];
      after = [ "network-online.target" ];
      serviceConfig = {
        ExecStart = "${cfg.package}/bin/pyroscope -config.file ${configFile} -config.expand-env";
        WorkingDirectory = "/var/lib/pyroscope";
        User = "pyroscope";
        DynamicUser = true;
        Restart = "on-failure";
        RuntimeDirectory = "pyroscope";
        StateDirectory = "pyroscope";
        EnvironmentFile = [ cfg.secretFile ];
      };
    };
  };
}