# nix run github:nix-community/disko -- --mode zap_create_mount ./disko-config.nix
# nixos-generate-config --no-filesystems --root /mnt
{ config, lib, ... }:
{

  boot.supportedFilesystems = [ "zfs" ];
  # head -c4 /dev/urandom | od -A none -t x4
  networking.hostId = "59e38471";
  services.zfs.autoSnapshot.enable = true;

  # ZFS already has its own scheduler. Without this my(@Artturin) computer froze for a second when i nix build something.
  # copied from : https://github.com/numtide/srvos/blob/main/nixos/common/zfs.nix
  services.udev.extraRules = lib.optionalString (config.boot.zfs.enabled) ''
    ACTION=="add|change", KERNEL=="sd[a-z]*[0-9]*|mmcblk[0-9]*p[0-9]*|nvme[0-9]*n[0-9]*p[0-9]*", ENV{ID_FS_TYPE}=="zfs_member", ATTR{../queue/scheduler}="none"
  '';

  disko.devices = {
    disk = {
      root = {
        type = "disk";
        device = "/dev/nvme0n1";
        content = {
          type = "table";
          format = "gpt";
          partitions = [
            {
              name = "ESP";
              start = "0";
              end = "500MiB";
              bootable = true;
              content = {
                type = "filesystem";
                format = "vfat";
                mountpoint = "/boot";
                mountOptions = [ "defaults" ];
              };
            }
            {
              name = "zfs";
              start = "500MiB";
              end = "100%";
              content = {
                type = "luks";
                name = "root";
                settings.allowDiscards = true;
                passwordFile = "/tmp/secret.key";
                content = {
                  type = "zfs";
                  pool = "zroot";
                };
              };
            }
          ];
        };
      };
    };
    zpool = {
      zroot = {
        type = "zpool";
        rootFsOptions = {
          mountpoint = "none";
          canmount = "off";
          compression = "lz4";
        };
        datasets = {
          "root" = {
            type = "zfs_fs";
            mountpoint = "/";
            options = {
              mountpoint = "legacy";
              compression = "lz4";
            };
          };
          "store" = {
            type = "zfs_fs";
            mountpoint = "/nix/store";
            options = {
              mountpoint = "legacy";
              compression = "lz4";
            };
          };
        };
      };
    };

  };
}