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

let
  cfg = config.boot.zfs;
in
{
  options = {
    boot.zfs = {
      recommendedDefaults = libS.mkOpinionatedOption "enable recommended ZFS settings";
      latestCompatibleKernel = libS.mkOpinionatedOption "use the latest ZFS compatible kernel";
    };
  };

  config = lib.mkIf cfg.enabled {
    boot.kernelPackages =
      let
        ver = config.boot.zfs.package.latestCompatibleLinuxPackages.kernel.version;
      in
      # 6.0 has a bug in the bind syscall and does not error correct when the port is already in use
        # https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/7VPNMC77YC3SI5LFYKUA4B5MTFPLTLVB/
        # https://lore.kernel.org/stable/CAFsF8vL4CGFzWMb38_XviiEgxoKX0GYup=JiUFXUOmagdk9CRg@mail.gmail.com/
      lib.mkIf (cfg.latestCompatibleKernel && lib.versions.majorMinor ver != "6.0") (lib.mkDefault config.boot.zfs.package.latestCompatibleLinuxPackages);

    services.zfs = lib.mkIf cfg.recommendedDefaults {
      autoScrub.enable = true;
      trim.enable = true;
    };

    virtualisation.containers.storage.settings = lib.mkIf cfg.recommendedDefaults (lib.recursiveUpdate options.virtualisation.containers.storage.settings.default {
      # fixes: Error: 'overlay' is not supported over zfs, a mount_program is required: backing file system is unsupported for this graph driver
      storage.options.mount_program = "${pkgs.fuse-overlayfs}/bin/fuse-overlayfs";
    });
  };
}