# disko.nix – Root-on-ZFS (rpool) + Daten-Pool (tank)
{ disks, ... }:

{
  disko.devices = {
    disk.main = {
      device = builtins.elemAt disks 0;
      type   = "disk";

      content = {
        type = "gpt";
        partitions = {
          ESP = {
            size = "1G"; type = "EF00";
            content = {
              type       = "filesystem";
              format     = "vfat";
              extraArgs   = [ "-F32" ];
              mountpoint = "/boot";
            };
          };
          rpool = {
            size = "60G";
            content = { type = "zfs"; pool = "rpool"; };
          };
          tank = {
            size = "100%";
            content = { type = "zfs"; pool = "tank"; };
          };
        };
      };
    };

    zpool.rpool = {
      type    = "zpool";
      options = { ashift = "12"; autotrim = "on"; };
      rootFsOptions = {
        compression = "zstd";
      };
      postCreateHook = "zfs list -t snapshot -H -o name | grep -E '^rpool@blank$' || zfs snapshot rpool@blank";

      datasets = {
        root = {
          type       = "zfs_fs";
          mountpoint = "/";
          options = {
            mountpoint = "legacy";
            compression = "zstd";
            "com.sun:auto-snapshot" = "false";
          };
        };
        nix = {
          type       = "zfs_fs";
          mountpoint = "/nix";
          options.mountpoint = "legacy";
          options.compression = "zstd";
        };
      };
    };

    zpool.tank = {
      type    = "zpool";
      options = { ashift = "12"; autotrim = "on"; };
      postCreateHook = "zfs list -t snapshot -H -o name | grep -E '^tank@blank$' || zfs snapshot tank@blank";
      datasets = {
        media = {
          type       = "zfs_fs";
          mountpoint = "/tank";
          options.mountpoint = "legacy";
          options.compression = "zstd";
        };
        home = {
          type       = "zfs_fs";
          mountpoint = "/home";
          options.mountpoint = "legacy";
          options.compression = "zstd";
        };
      };
    };
  };
}