{ config, pkgs, ... }:

{
  imports =
    [ # Include the results of the hardware scan.
      ./hardware.nix
    ];

  boot = {
    tmp.cleanOnBoot = true;
  };
  zramSwap.enable = true;

  nix = {
    settings = {
      auto-optimise-store = true;
      experimental-features = ["nix-command" "flakes"];
    };
    gc = {
      automatic = true;
      dates = "weekly";
      options = "--delete-older-than 30d";
    };
    # Free up to 1GiB whenever there is less than 100MiB left.
    extraOptions = ''
      min-free = ${toString (100 * 1024 * 1024)}
      max-free = ${toString (1024 * 1024 * 1024)}
      '';
  };

  networking = {
    hostName = "nix-cache";
    domain = "gmem.ca";
    firewall = {
      trustedInterfaces = ["tailscale0"];
      checkReversePath = "loose";
      allowedTCPPorts = [ 80 443 ];
      allowedUDPPortRanges = [
        { from = 4000; to = 4007; }
        { from = 8000; to = 8010; }
      ];
      allowedUDPPorts = [ 41641 ];
      enable = true;
    };
    nftables.enable = true;
    nameservers = [ "1.1.1.1" "1.0.0.1" ];
  };

  time.timeZone = "Europe/London";

  users.users.root.openssh.authorizedKeys.keys = let
    authorizedKeys = pkgs.fetchurl {
      url = "https://gmem.ca/ssh";
      sha256 = "0iwrm80hsadr0midy0h3da4x0sbci76a92g8f9wnz5pj38gimdi9";
    };
  in pkgs.lib.splitString "\n" (builtins.readFile
    authorizedKeys);

  environment.systemPackages = with pkgs; [
    vim
    wget
    htop
    git
    screen
    nix-output-monitor
    tailscale
    nfs-utils
  ];

  services = {
    rpcbind.enable = true;
    openssh.enable = true;
    tailscale.enable = true;
    nix-serve = {
      enable = true;
      secretKeyFile = "/var/cache-priv-key.pem";
    };
    nginx = {
      enable = true;
      recommendedProxySettings = true;
      recommendedGzipSettings = true;
      recommendedBrotliSettings = true;
      recommendedZstdSettings = true;
      recommendedOptimisation = true;
      recommendedTlsSettings = true;
      virtualHosts = {
        "nix-cache.gmem.ca" = {
          enableACME = true;
          forceSSL = true;
          locations."/".proxyPass = "http://${config.services.nix-serve.bindAddress}:${toString config.services.nix-serve.port}";
        };
        "git.gmem.ca" = {
          enableACME = true;
          forceSSL = true;
          locations."/" = {
            proxyPass = "http://100.116.48.47";
            extraConfig =
              ''
              client_max_body_size 100M;
              '';
          };
        };
      };
    };
  };

  security.acme = {
    acceptTerms = true;
    email = "acme@gmem.ca";
  };

  system.copySystemConfiguration = true;

  system.stateVersion = "23.11"; # dId YoU rEaD tHe CoMmEnT?

}