{ config, pkgs, stablePkgs, ... }:

let
  home = "/home/rilla";
  offline-backups = pkgs.writeScriptBin "offline-backups" ''
    #!${pkgs.dash}/bin/dash

    set -xe

    for x in 0 1 2; do
      ${pkgs.systemd}/bin/systemctl start "mnt-backups-''${x}.mount"
    done && \
    /run/wrappers/bin/doas -u btrbk \
      ${pkgs.btrbk}/bin/btrbk \
        --config /etc/btrbk/offline-backups.conf \
        --progress \
        --verbose \
        "$@"
  '';

in
{
  imports = [
    ./hardware-configuration.nix
    ../../modules/common
    ../../modules/common/desktop.nix
  ];

  home-manager.users.rilla.imports = [
    ../../../home/hosts/capibara.nix
  ];

  fileSystems = {
    "/" = {
      device = "tmpfs";
      fsType = "tmpfs";
      options = [ "defaults" "size=2G" "mode=755" ];
    };

    "/mnt/btr_root" = {
      device = "/dev/mapper/root";
      fsType = "btrfs";
      options = [ "subvolid=5" "compress=zstd" ];
    };

    "/mnt/btr_data" = {
      device = "/dev/mapper/data";
      fsType = "btrfs";
      options = [ "subvolid=5" "compress=zstd" ];
    };

    "/mnt/persist" = {
      device = "/dev/mapper/data";
      fsType = "btrfs";
      options = [ "subvol=persist" "compress=zstd" ];
      neededForBoot = true;
    };

    "/mnt/logs" = {
      device = "/dev/mapper/root";
      fsType = "btrfs";
      options = [ "subvol=logs" "compress=zstd" ];
      neededForBoot = true;
    };

    "/mnt/data" = {
      device = "/dev/mapper/data";
      fsType = "btrfs";
      options = [ "subvol=data" "compress=zstd" ];
      neededForBoot = true;
    };

    "/mnt/secrets" = {
      device = "narwhal:/secrets";
      fsType = "nfs";
      options = [ "noauto" ];
    };

    "/mnt/secrets/gnupg" = {
      device = "/dev/mapper/gnupg_secrets";
      fsType = "btrfs";
      options = [ "noauto" ];
    };

    "/nix" = {
      device = "/dev/mapper/root";
      fsType = "btrfs";
      options = [ "subvol=nix" "compress=zstd" ];
    };

    "/boot" = {
      device = "/dev/disk/by-uuid/c99d1f1b-45a4-4a25-b5b8-bc76464c6825";
      fsType = "ext4";
    };

    "/swap" = {
      device = "/dev/mapper/root";
      fsType = "btrfs";
      options = [ "subvol=swap" ];
    };

    "/mnt/vfs_share" = {
      device = "/dev/mapper/data";
      fsType = "btrfs";
      options = [ "subvol=vfs_share" "compress=zstd" ];
      neededForBoot = true;
    };

    "/mnt/backups/0" = {
      device = "/dev/mapper/backups0";
      fsType = "btrfs";
      options = [ "noauto" "subvolid=5" "compress=zstd" ];
    };

    "/mnt/backups/1" = {
      device = "/dev/mapper/backups1";
      fsType = "btrfs";
      options = [ "noauto" "subvolid=5" "compress=zstd" ];
    };

    "/mnt/backups/2" = {
      device = "/dev/mapper/backups2";
      fsType = "btrfs";
      options = [ "noauto" "subvolid=5" "compress=zstd" ];
    };

  };

  swapDevices = [{ device = "/swap/swapfile"; }];

  environment.etc = {
    crypttab = {
      text = ''
        backups0 UUID="e45232d5-f46f-46f3-a150-be26374b3357" /etc/luks-keys/backups.bin noauto
        backups1 UUID="5b3da928-4862-4451-89cd-5bd6a95466d0" /etc/luks-keys/backups.bin noauto
        backups2 UUID="cbfa9cba-dee2-4d0b-8cde-2f1d1849b22c" /etc/luks-keys/backups.bin noauto
        gnupg_secrets /mnt/secrets/gnupg.img none noauto
      '';
    };
  };

  environment.variables = {
    LV2_PATH =
      "${home}/.nix-profile/lib/lv2:${home}/Audio/plugins/lv2:/run/current-system/sw/lib/lv2";
    LXVST_PATH =
      "${home}/.nix-profile/lib/lxvst:${home}/Audio/plugins/lxvst:/run/current-system/sw/lib/lxvst";
    LADSPA_PATH =
      "${home}/.nix-profile/lib/ladspa:${home}/Audio/plugins/ladspa:/run/current-system/sw/lib/ladspa";
  };

  networking.networkmanager.wifi.macAddress = "CC:AF:78:75:29:32";

  nixpkgs.config.allowUnfree = true;
  programs.steam.enable = true;

  boot = {

    loader = {
      grub = {
        efiSupport = false;
        efiInstallAsRemovable = false;
        enable = true;
        device = "/dev/disk/by-id/ata-KINGSTON_SKC600MS512G_50026B7783FC3D2F";
      };
    };
    initrd = {
      luks = {
        devices = {
          root = {
            device = "/dev/disk/by-uuid/869b4b9e-5004-4625-877f-6b1c9489ac8f";
            allowDiscards = true;
          };
          data = {
            device = "/dev/disk/by-uuid/6a9246a0-984b-471c-9950-be16db3060f5";
            allowDiscards = true;
          };
        };
        reusePassphrases = true;
      };
    };
  };

  services.earlyoom.enable = true;

  # Power management
  powerManagement.enable = true;
  services.upower.enable = true;
  # services.thermald.enable = true;
  services.tlp.enable = true;
  services.power-profiles-daemon.enable = false;
  environment.systemPackages = with pkgs; [ powertop acpi offline-backups ];

  #services.beesd.filesystems = {
  #  root = {
  #    spec = "/dev/mapper/root";
  #    hashTableSizeMB = 256;
  #    verbosity = "info";
  #    extraOptions = [ "--loadavg-target" "2.0" ];
  #  };
  #};

  # todo: target and/or archive
  services.btrbk.instances = {
    btrbk = {
      onCalendar = "*:0/30"; # every 30 minutes
      settings = {
        snapshot_preserve = "2d";
        snapshot_preserve_min = "latest";
        snapshot_create = "onchange";
        volume."/mnt/btr_data" = {
          snapshot_dir = "btrbk_snapshots";
          subvolume = {
            data = { };
            persist = { };
          };
        };
      };
    };

    # doas -u btrbk btrbk -c /etc/btrbk/offline-backups.conf --dry-run --progress --verbose run
    offline-backups = {
      onCalendar = null;
      settings = {
        ssh_user = "btrbk";
        ssh_identity = "/etc/btrbk/id_ed25519";
        backend_remote = "btrfs-progs-doas";
        snapshot_create = "onchange";
        snapshot_preserve_min = "latest";
        target_preserve_min = "all";
        volume = {

          "ssh://narwhal:22/mnt/btr_pool" = {
            stream_buffer = "50%";
            stream_compress = "zstd";
            snapshot_dir = "btrbk_snapshots_offline";
            subvolume = {
              backups = { };
              books = { };
              certs = { };
              data = { };
              docker_volumes = { };
              home = { };
              http = { };
              music = { };
              secrets = { };
              transmission = { };
              videos = { };
            };
            target = {
              "/mnt/backups/0/btr_backup/narwhal" = { };
              "/mnt/backups/1/btr_backup/narwhal" = { };
              "/mnt/backups/2/btr_backup/narwhal" = { };
            };
          };

          "ssh://suricata:22/mnt/btr_pool" = {
            stream_buffer = "50%";
            snapshot_dir = "btrbk_snapshots_offline";
            compat_remote = "busybox";
            subvolume = {
              home = { };
              rancher_config = { };
              backups = { };
              configs = { };
            };
            target = {
              "/mnt/backups/0/btr_backup/suricata" = { };
              "/mnt/backups/1/btr_backup/suricata" = { };
              "/mnt/backups/2/btr_backup/suricata" = { };
            };
          };

          "ssh://caladan/mnt/btr_pool" = {
            stream_buffer = "50%";
            snapshot_dir = "btrbk_snapshots_offline";
            compat_remote = "busybox";
            subvolume = {
              certs = { };
              volumes = { };
            };
            target = {
              "/mnt/backups/0/btr_backup/caladan" = { };
              "/mnt/backups/1/btr_backup/caladan" = { };
              "/mnt/backups/2/btr_backup/caladan" = { };
            };
          };

          "/mnt/btr_data" = {
            snapshot_dir = "btrbk_snapshots_offline";
            subvolume = {
              data = { };
              persist = { };
            };
            target = {
              "/mnt/backups/0/btr_backup/capibara" = { };
              "/mnt/backups/1/btr_backup/capibara" = { };
              "/mnt/backups/2/btr_backup/capibara" = { };
            };
          };
        };
      };
    };
  };

  xdg.portal = {
    enable = true;
    wlr.enable = true;
    extraPortals = [ pkgs.xdg-desktop-portal-gtk ];
  };

  networking = {
    hostName = "capibara";
    interfaces = {
      eno0.useDHCP = true;
      wlp2s0.useDHCP = true;
    };
  };

  system.stateVersion = "23.05";
}