# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

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

let home = "/home/rilla";

in {
  imports = [ ./nixos/hardware-configuration/capibara.nix ./nixos/common.nix ];

  home-manager = {
    users.rilla.imports =
      [ home/capibara.nix "${impermanence}/home-manager.nix" ];
    extraSpecialArgs.stablePkgs = stablePkgs;
  };

  fileSystems = {

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

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

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

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

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

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

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

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

  };

  environment.variables = {
    NIXOS_CONFIG = "${home}/configs/nix-config/capibara.nix";
    LV2_PATH =
      "${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;
        version = 2;
        # device = "/dev/disk/by-id/ata-KINGSTON_SKC600MS512G_50026B7783FC3D2F";
        device = "/dev/disk/by-id/ata-WDC_WDBNCE0010PNC_21112S803178";
        enableCryptodisk = true;
      };
    };
    initrd = {
      luks.devices = {
        root = {
          device = "/dev/disk/by-uuid/0fdb839e-dee8-4374-81e6-4455cfc3ae39";
          keyFile = "/keyfile.bin";
          allowDiscards = true;
        };
      };
      secrets = { "/keyfile.bin" = "/boot/keyfile.bin"; };
    };
  };

  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 ];

  #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_root" = {
        snapshot_dir = "btrbk_snapshots";
        subvolume = {
          data = { };
          persist = { };
        };
      };
    };
  };

  services.xserver.deviceSection = ''
    Option "TearFree" "true"
  '';

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

  # This value determines the NixOS release from which the default
  # settings for stateful data, like file locations and database versions
  # on your system were taken. It‘s perfectly fine and recommended to leave
  # this value at the release version of the first install of this system.
  # Before changing this value read the documentation for this option
  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
  system.stateVersion = "21.05"; # Did you read the comment?
}