{
  description = "ISO7010 Twitter bot";

  inputs = {
    utils.url = "github:numtide/flake-utils";
    devshell = {
      url = "github:numtide/devshell";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    naersk = {
      url = "github:nix-community/naersk";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = {
    self,
    nixpkgs,
    utils,
    naersk,
    devshell,
    rust-overlay,
  }:
    utils.lib.eachDefaultSystem (system: let
      pkgs = import nixpkgs {
        inherit system;
        overlays = [(import rust-overlay)];
      };
      rust = pkgs.rust-bin.stable.latest.default.override {
        extensions = [ "rust-src" ];
      };
      # Override naersk to use our chosen rust version from rust-overlay
      naersk-lib = naersk.lib.${system}.override {
        cargo = rust;
        rustc = rust;
      };
      packig = naersk-lib.buildPackage {
        pname = "iso7010-a-day";
        root = ./.;
        buildInputs = [pkgs.openssl pkgs.pkg-config];
      };
    in {
      packages.default = packig;

      apps.default = utils.lib.mkApp {drv = packig;};

      hydraJobs.build = packig;

      # Provide a dev env with rust and rls
      devShells.default = let
        pkgs = import nixpkgs {
          inherit system;
          overlays = [devshell.overlays.default];
        };
      in
        pkgs.devshell.mkShell {
          packages = with pkgs; [rust rust-analyzer];
        };
      formatter = pkgs.alejandra;
    }) // {
      overlays.default = final: prev: {
        iso7010-a-day = self.packages.${prev.system}.default;
      };

      nixosModules.default = {
        config,
        lib,
        pkgs,
        ...
      }:
        with lib; let
          cfg = config.services.iso7010-a-day;
        in {
          options.services.iso7010-a-day = {
            enable = mkEnableOption "Enable the iso7010 bot";
            environmentFile = mkOption {
              type = types.path;
              description = "Path to the environment file";
            };
          };
          config = mkIf cfg.enable {
            nixpkgs.overlays = [self.overlays.default];
            systemd.services.iso7010-a-day = {
              description = "Samw's ISO7010 bot";
              serviceConfig = {
                Type = "oneshot";
                DynamicUser = true;
                User = "iso7010";
                ExecStart = "${pkgs.iso7010-a-day}/bin/iso7010_a_day run-bot";
                EnvironmentFile = cfg.environmentFile;
              };
            };
            systemd.timers.iso7010-a-day = {
              wantedBy = [ "timers.target" ];
              partOf = [ "iso7010-a-day.service" ];
              timerConfig.OnCalendar = [ "*-*-* 12:00:00" ];
            };
          };
        };
    };
}