{
  lib,
  config,
  pkgs,
  ...
}:
with lib; let
  cfg = config.local.btrfs;
in {
  options.local.btrfs = {
    mounts = mkOption {
      default = {};

      type = with lib.types;
        attrsOf (submodule {
          options = {
            ssd = mkOption {
              type = bool;
            };

            device = mkOption {
              type = str;
            };

            subvol = mkOption {
              type = str;
            };
          };
        });
    };
  };

  config = mkIf (cfg.mounts != {}) {
    fileSystems = let
      btrfsMount = {
        device,
        subvol,
        ssd,
      }: {
        inherit device;
        fsType = "btrfs";
        options = ["noatime" "compress=zstd" "subvol=${subvol}"] ++ optional ssd "ssd";
      };
    in
      mapAttrs (_: btrfsMount) cfg.mounts;
  };
}