{ makise-next, }:
{ config, lib, pkgs, ... }:
let
  types = lib.types;
  cfg = config.services.makise-next;
  toml = pkgs.formats.toml {};
  configs = let generated = (if cfg.config != null then [(toml.generate "config.toml" cfg.config)] else []);
                all = generated ++ cfg.configFiles;
            in builtins.map (x: "--config ${x}") all;
  configParameters = lib.strings.concatStringsSep " " configs;
in
{
  options.services.viendesu-maid = {
    autoStart = lib.mkOption {
      description = "start Maid with the system";
      type = types.bool;
      default = false;
    };
    user = lib.mkOption {
      description = "user under which Maid will run";
      type = types.str;
    };
    enable = lib.mkEnableOption "viendesu-maid";
    config = lib.mkOption {
      description = "configuration for the Maid";
      type = types.nullOr types.attrs;
      default = null;
    };
    configFiles = lib.mkOption {
      description = "list of configuration files for Maid";
      type = types.listOf types.str;
      default = [];
    };

    environment = lib.mkOption {
      description = "list of environment variables";
      type = types.attrs;
      default = {};
    };
    environmentFiles = lib.mkOption {
      description = "environment variables files";
      type = types.listOf types.str;
      default = [];
    };
  };

  config = {
    systemd.services.viendesu-maid = lib.mkIf cfg.enable {
      wantedBy = lib.mkIf cfg.autoStart [ "multi-user.target" ];
      after = [ "network.target" ];
      description = "VienDesu! Maid bot";

      serviceConfig = {
        Type = "simple";
        User = cfg.user;
        ExecStart = "${makise-next} ${configParameters}";
        EnvironmentFile = cfg.environmentFiles;
        Environment = builtins.map ({ name, value }: "${name}=${value}")
          (lib.attrsets.attrsToList cfg.environment);
      };
    };
  };
}