{
  description = "Bitcoin price model";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs =
    { self, nixpkgs }:
    let
      systems = [
        "aarch64-darwin"
        "x86_64-darwin"
        "aarch64-linux"
        "x86_64-linux"
      ];
      forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f nixpkgs.legacyPackages.${system});
    in
    {
      devShells = forAllSystems (pkgs: {
        default = pkgs.mkShell {
          packages = [
            (pkgs.python313.withPackages (ps: [
              ps.numpy
              ps.pandas
              ps.scipy
              ps.matplotlib
              ps.pytest
            ]))
            pkgs.ruff
            pkgs.just
          ];
        };
      });

      formatter = forAllSystems (pkgs: pkgs.nixfmt);
    };
}