{
  config,
  jellyfin-flake,
  jellyfin-ultrachromic-src,
  lib,
  pkgs,
  ...
}: let
  inherit (lib) hasAttr fileContents optionals;
  inherit (config.vars) mainUser;

  optionalGroup = name:
    optionals
    (hasAttr name config.users.groups)
    [config.users.groups.${name}.name];
in {
  imports = [
    ./jfa-go.nix
    ./packages.nix
    jellyfin-flake.nixosModules.default
  ];

  users.users."jellyfin".extraGroups =
    optionalGroup mainUser
    ++ optionalGroup "input"
    ++ optionalGroup "media"
    ++ optionalGroup "render"
    ++ optionalGroup "video";

  services.jellyfin = {
    enable = true;

    settings = {
      system = {
        serverName = "Jelly";
        quickConnectAvailable = false;
        isStartupWizardCompleted = true;

        enableGroupingIntoCollections = true;
        enableExternalContentInSuggestions = false;

        pluginRepositories = [
          {
            name = "Jellyfin Stable";
            url = "https://repo.jellyfin.org/releases/plugin/manifest-stable.json";
          }
          {
            name = "Intro Skipper";
            url = "https://raw.githubusercontent.com/jumoog/intro-skipper/master/manifest.json";
          }
          {
            name = "Merge Versions Plugin";
            url = "https://raw.githubusercontent.com/danieladov/JellyfinPluginManifest/master/manifest.json";
          }
        ];

        enableSlowResponseWarning = false;
      };

      branding = let
        jellyTheme = pkgs.stdenv.mkDerivation {
          name = "Ultrachromic";
          src = jellyfin-ultrachromic-src;
          postInstall = "cp -ar $src $out";
        };

        importFile = file: fileContents "${jellyTheme}/${file}";
      in {
        customCss = ''
          /* Base theme */
          ${importFile "base.css"}
          ${importFile "accentlist.css"}
          ${importFile "fixes.css"}

          ${importFile "type/dark_withaccent.css"}

          ${importFile "rounding.css"}
          ${importFile "progress/floating.css"}
          ${importFile "titlepage/title_banner-logo.css"}
          ${importFile "header/header_transparent.css"}
          ${importFile "login/login_frame.css"}
          ${importFile "fields/fields_border.css"}
          ${importFile "cornerindicator/indicator_floating.css"}

          /* Style backdrop */
          .backdropImage {filter: blur(18px) saturate(120%) contrast(120%) brightness(40%);}

          /* Custom Settings */
          :root {--accent: 145,75,245;}
          :root {--rounding: 12px;}

          /* https://github.com/CTalvio/Ultrachromic/issues/79 */
          .skinHeader {
            color: rgba(var(--accent), 0.8);;
          }
          .countIndicator,
          .fullSyncIndicator,
          .mediaSourceIndicator,
          .playedIndicator {
            background-color: rgba(var(--accent), 0.8);
          }
        '';
      };

      encoding = {
        hardwareAccelerationType = "nvenc";
        hardwareDecodingCodecs = [
          "h264"
          "hevc"
          "mpeg2video"
          "mpeg4"
          "vc1"
          "vp8"
          "vp9"
          "av1"
        ];
        allowHevcEncoding = false;
        enableThrottling = false;
        enableTonemapping = true;
        downMixAudioBoost = 1;
      };
    };
  };
}