{

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";

    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs.nixpkgs.follows = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };
    pre-commit-hooks = {
      url = "github:cachix/pre-commit-hooks.nix";
      inputs.flake-utils.follows = "flake-utils";
    };

    crane = {
      url = "github:ipetkov/crane";
      inputs.nixpkgs.follows = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
      inputs.rust-overlay.follows = "rust-overlay";
    };
  };

  outputs = { self, nixpkgs, flake-utils, rust-overlay, pre-commit-hooks, crane }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        overlays = [ (import rust-overlay) ];
        pkgs = import nixpkgs { inherit system overlays; };
        rustToolchain =
          pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;

        crane-lib = (crane.mkLib pkgs).overrideToolchain rustToolchain;
        src = crane-lib.cleanCargoSource ./.;
        buildInputs = with pkgs; [
        ] ++ lib.optionals pkgs.stdenv.isDarwin [ pkgs.libiconv ];
        nativeBuildInputs = with pkgs; [
          pkgconf
        ];

        cargoArtifacts = crane-lib.buildDepsOnly {
          inherit src buildInputs nativeBuildInputs;
        };

        ha-now-playing = crane-lib.buildPackage {
          inherit cargoArtifacts src buildInputs nativeBuildInputs;
        };

      in
      {
        formatter = pkgs.nixpkgs-fmt;

        packages = {
          inherit ha-now-playing;
        };
        packages.default = self.packages.${system}.ha-now-playing;

        apps.ha-now-playing = flake-utils.lib.mkApp {
          drv = self.packages.${system}.default;
        };
        apps.default = self.apps.${system}.ha-now-playing;

        overlays = _final: _prev: {
          inherit (self.packages.${system}) ha-now-playing;
        };

        checks = {
          inherit ha-now-playing;

          ha-now-playing-clippy = crane-lib.cargoClippy {
            inherit cargoArtifacts src buildInputs nativeBuildInputs;
            cargoClippyExtraArgs = "--all-targets -- --deny warnings";
          };

          ha-now-playing-fmt = crane-lib.cargoFmt {
            inherit src;
          };

          pre-commit-check = pre-commit-hooks.lib.${system}.run {
            src = ./.;
            hooks = {
              nixpkgs-fmt.enable = true;
              statix.enable = true;
              deadnix.enable = true;
              rust-overlay-clippy = {
                enable = true;
                name = "rust-overlay clippy";
                entry = "${rustToolchain}/bin/cargo-clippy clippy";
                files = "\\.rs$";
                excludes = [ "^$" ];
                types = [ "file" ];
                types_or = [ ];
                language = "system";
                pass_filenames = false;
              };
            };
          };
        };

        devShells.default = with pkgs; mkShell {
          inherit (self.checks.${system}.pre-commit-check) shellHook;

          name = "ha-now-playing";
          inputsFrom = [ self.packages.${system}.ha-now-playing ];
          packages = [
            rustToolchain
            cargo-edit
            cargo-diet
            cargo-feature
            cargo-outdated
            pre-commit
            rust-analyzer
            taplo
            gitflow

            dsniff # has the tcpkill command to test dropped connections
          ];
        };

      });

}