{ pkgs, lib, config, ... }:
let inherit (lib) types;
in
{
imports = [
  ./modules.nix
  ./defaults/predictable-interface-names.nix
];
config = {
  nix = {
    autoOptimiseStore = true;
    #binaryCaches = lib.mkForce [];
    extraOptions = ''
    '';
    # Use gc.automatic to keep disk space under control.
    gc = {
      automatic = true;
      dates = "weekly";
      options = "--delete-older-than 30d";
    };
    nixPath = [
      "nixpkgs=${pkgs.path}"
    ];
  };

  nixpkgs = {
    config = {
      allowUnfree = false;
      /*
      packageOverrides = pkgs: {
        postfix = pkgs.postfix.override {
          withLDAP = true;
        };
      };
      */
    };
    #overlays = import ../overlays.nix;
  };

  documentation.nixos = {
    enable = false; # NOTE: useless on a server, and CPU intensive.
  };

  # Clean /tmp automatically on boot.
  boot.cleanTmpDir = true;

  time = {
    timeZone = "Europe/Paris";
  };

  i18n = {
    consoleFont   = "Lat2-Terminus16";
    consoleKeyMap = "fr";
    defaultLocale = "fr_FR.UTF-8";
  };

  services = {
    openssh = {
      enable = true;
      passwordAuthentication = false;
      extraConfig = ''
      '';
    };
    journald = {
      extraConfig = ''
        SystemMaxUse=50M
      '';
    };
  };

  environment = {
    systemPackages = with pkgs; [
      binutils
      dnsutils
      htop
      inetutils
      iotop
      lsof
      mailutils
      multitail
      ncdu
      pv
      swaplist
      tcpdump
      tmux
      tree
      vim
      which
    ];

    etc."inputrc".text = lib.readFile defaults/readline/inputrc;
  };

  programs = {
    bash = {
      interactiveShellInit = ''
        bind '"\e[A":history-search-backward'
        bind '"\e[B":history-search-forward'

        # Ignore duplicate commands, ignore commands starting with a space
        export HISTCONTROL=erasedups:ignorespace
        export HISTSIZE=42000

        # Append to the history instead of overwriting (good for multiple connections)
        shopt -s histappend
      '';
      shellAliases = {
        cl = "clear";
        l  = "ls -alh";
        ll = "ls -l";
        ls = "ls --color=tty";
        mem = "ps -e -orss=,user=,args= | sort -b -k1,1n";

        s="sudo systemctl";
        s-u="systemctl --user";

        nixos-clean="sudo nix-collect-garbage -d";
        nixos-history="sudo nix-env --list-generations --profile /nix/var/nix/profiles/system";
        nixos-rollback="sudo nixos-rebuild switch --rollback";
        nixos-update="sudo nix-channel --update";
        nixos-upgrade="sudo nixos-rebuild switch";
        nixos-upstream="sudo nix-channel --list";
      };
    };
    mtr.enable = true;
  };
};
}