# 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, ... }:

let
  impermanence = builtins.fetchTarball {
    url = "https://github.com/nix-community/impermanence/archive/master.tar.gz";
  };
in {
  imports = [ # Include the results of the hardware scan.
    ./nixos/hardware-configuration/capibara.nix
    ./nixos/common.nix
    "${impermanence}/nixos.nix"
  ];

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

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

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

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

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

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

  };

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

  environment.persistence."/persist/system" = {
    directories = [
      "/var/log"
      "/var/lib/bluetooth"
      "/var/lib/systemd/coredump"
      "/var/lib/docker"
    ];
    files = [
      "/etc/machine-id"
      #"/etc/nix/id_rsa"
      "/etc/ssh/ssh_host_ed25519_key"
      "/etc/ssh/ssh_host_ed25519_key.pub"
      "/etc/ssh/ssh_host_rsa_key"
      "/etc/ssh/ssh_host_rsa_key.pub"
      "/etc/wireguard/wg0"
    ];
  };

  environment.persistence."/persist/user" = {
    directories = [
      "/etc/NetworkManager/system-connections"
      "/etc/nixos"
      "/var/lib/libvirt"
    ];
    files = [
      "/etc/wireguard/wg0"
    ];
  };

  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";
        enableCryptodisk = true;
      };
    };
    initrd = {
      luks.devices = {
        system = {
          device = "/dev/disk/by-uuid/a5837435-d55e-4506-b256-e5c707d205c3";
          keyFile = "/root_keyfile.bin";
        };
        user = {
          device = "/dev/disk/by-uuid/0fdb839e-dee8-4374-81e6-4455cfc3ae39";
          keyFile = "/data_keyfile.bin";
        };
      };
      secrets = {
        "/root_keyfile.bin" = "/boot/root_keyfile.bin";
        "/data_keyfile.bin" = "/boot/data_keyfile.bin";
      };
    };
  };

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

  services.udev.extraRules = ''
    # UDEV rules for Teensy USB devices
    ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789B]?", ENV{ID_MM_DEVICE_IGNORE}="1"
    ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789A]?", ENV{MTP_NO_PROBE}="1"
    SUBSYSTEMS=="usb", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789ABCD]?", MODE:="0666"
    KERNEL=="ttyACM*", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789B]?", MODE:="0666"
    ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="df11", MODE="664", GROUP="plugdev"
  '';

  hardware.opengl.enable = true;
  hardware.bluetooth.enable = true;
  services.blueman.enable = 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?
}