# INFO: this module is also sourced by Darwin hosts
{ inputs, lib, ... }:
let
  registryInputs =
    lib.mapAttrs (_: val: { flake = val; })
      (lib.filterAttrs (name: value: name != "self" && (builtins.hasAttr "_type" value) && value._type == "flake") inputs);
in
{
  # I don't use GNU's info
  documentation.info.enable = false;

  # Just expose everything possible so shell completion works
  environment.pathsToLink = [
    "/share/fish"
    "/share/zsh"
    "/share/bash-completion"
  ];

  fonts.fontDir.enable = true;

  nix.nixPath = [
    "nixpkgs=${inputs.nixpkgs}"
    "/nix/var/nix/profiles/per-user/root/channels"
  ];

  nix.registry = registryInputs // { dotfiles.flake = inputs.self; };

  nix.settings = {
    auto-allocate-uids = true;
    auto-optimise-store = true;
    sandbox = true;
    keep-outputs = true;
    use-xdg-base-directories = true;
    http-connections = 0;
    max-jobs = "auto";
    trusted-users = [ "root" ];

    # Fallback quickly if substituters are not available.
    connect-timeout = 5;

    # Avoid copying unnecessary stuff over SSH
    builders-use-substitutes = true;

    # Avoid disk full issues
    max-free = 3000 * 1024 * 1024;
    min-free = 512 * 1024 * 1024;

    # The default at 10 is rarely enough.
    log-lines = 25;

    # Flakes are set explicitly via nix.registry, so don't imply any URLs here
    flake-registry = builtins.toFile "empty-registry.json" (builtins.toJSON {
      flakes = [ ];
      version = 2;
    });

    experimental-features = [
      "auto-allocate-uids"
      "ca-derivations"
      "flakes"
      "nix-command"
    ];

    substituters = [
      "https://cache.nixos.org"
      "https://nix-community.cachix.org"
      "https://nixpkgs-unfree.cachix.org"
      "https://numtide.cachix.org"
    ];
    trusted-public-keys = [
      "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
      "nixpkgs-unfree.cachix.org-1:hqvoInulhbV4nJ9yJOEr+4wxhDV4xq2d1DK7S6Nj6rs="
      "numtide.cachix.org-1:2ps1kLBUWjxIneOy1Ik6cQjb41X0iXVXeHigGmycPPE="
    ];
  };

  nixpkgs.config.allowUnfree = true;
  nixpkgs.overlays = [ inputs.vscode-extensions.overlays.default ];
}