{ inputs, lib, pkgs, ... }:

{
  nix.settings = {
    substituters =
      let
        channelStore = x: "https://${x}/nix-channels/store";
        mirrors = map (x: channelStore "mirrors.${x}.edu.cn") [
          "bfsu"
          "tuna.tsinghua"
          "ustc"
        ];
        cachix = x: "https://${x}.cachix.org";
      in
      lib.flatten [
        mirrors
        (cachix "nix-community")
        "https://cache.nixos.org"
        (cachix "inclyc")
      ];
    trusted-public-keys = [
      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
      "inclyc.cachix.org-1:izGZ+f/JLPovKX1OKd3rQZ8nPOCpvPij3+bebjxdZ2k="
    ];
    builders-use-substitutes = true;
  };
}