{ config, pkgs, lib, ... }:

with lib;

let
  cfg = config.services.uptime-kuma;
in
{

  options = {
    services.uptime-kuma = {
      enable = mkEnableOption (mdDoc "Uptime Kuma, this assumes a reverse proxy to be set.");

      package = mkOption {
        type = types.package;
        example = literalExpression "pkgs.uptime-kuma";
        default = pkgs.uptime-kuma;
        defaultText = "pkgs.uptime-kuma";
        description = lib.mdDoc "Uptime Kuma package to use.";
      };

      settings = lib.mkOption {
        type =
          lib.types.submodule { freeformType = with lib.types; attrsOf str; };
        default = { };
        example = {
          PORT = "4000";
          NODE_EXTRA_CA_CERTS = "/etc/ssl/certs/ca-certificates.crt";
        };
        description = lib.mdDoc ''
          Additional configuration for Uptime Kuma, see
          <https://github.com/louislam/uptime-kuma/wiki/Environment-Variables">
          for supported values.
        '';
      };
    };
  };

  config = mkIf cfg.enable {

    services.uptime-kuma.settings = {
      DATA_DIR = "/var/lib/uptime-kuma/";
      NODE_ENV = mkDefault "production";
    };

    systemd.services.uptime-kuma = {
      description = "Uptime Kuma";
      after = [ "network.target" ];
      wantedBy = [ "multi-user.target" ];
      environment = cfg.settings;
      serviceConfig = {
        Type = "simple";
        StateDirectory = "uptime-kuma";
        DynamicUser = true;
        ExecStart = "${cfg.package}/bin/uptime-kuma-server";
        Restart = "on-failure";
        ProtectHome = true;
        ProtectSystem = "strict";
        PrivateTmp = true;
        PrivateDevices = true;
        ProtectHostname = true;
        ProtectClock = true;
        ProtectKernelTunables = true;
        ProtectKernelModules = true;
        ProtectKernelLogs = true;
        ProtectControlGroups = true;
        NoNewPrivileges = true;
        RestrictRealtime = true;
        RestrictSUIDSGID = true;
        RemoveIPC = true;
        PrivateMounts = true;
      };
    };
  };
}