{
  description = "damocles-daemon - Matrix chat presence for Damocles";

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

    crane.url = "github:ipetkov/crane";

    treefmt-nix = {
      url = "github:numtide/treefmt-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    {
      self,
      nixpkgs,
      crane,
      treefmt-nix,
      ...
    }:
    let
      systems = [
        "x86_64-linux"
        "aarch64-linux"
      ];
      forAllSystems =
        f:
        nixpkgs.lib.genAttrs systems (
          system:
          let
            pkgs = nixpkgs.legacyPackages.${system};
            craneLib = crane.mkLib pkgs;
            src = craneLib.cleanCargoSource ./.;
            commonArgs = {
              inherit src;
              pname = "damocles-daemon";
              version = "0.1.0";
              nativeBuildInputs = with pkgs; [ pkg-config ];
              buildInputs = with pkgs; [
                openssl
                sqlite
              ];
            };
            # deps-only build - cached separately, only rebuilds when Cargo.lock changes
            cargoArtifacts = craneLib.buildDepsOnly commonArgs;
          in
          f {
            inherit
              pkgs
              craneLib
              commonArgs
              cargoArtifacts
              ;
            treefmt-eval = treefmt-nix.lib.evalModule pkgs treefmt-config;
          }
        );
      treefmt-config = {
        projectRootFile = "flake.nix";
        programs.nixfmt.enable = true;
        programs.rustfmt.enable = true;
        programs.taplo.enable = true;
      };
    in
    {
      packages = forAllSystems (
        {
          craneLib,
          commonArgs,
          cargoArtifacts,
          ...
        }:
        {
          default = craneLib.buildPackage (
            commonArgs
            // {
              inherit cargoArtifacts;
              meta = {
                description = "Matrix chat daemon for Damocles";
                mainProgram = "damocles-daemon";
                platforms = nixpkgs.lib.platforms.linux;
              };
            }
          );
        }
      );

      devShells = forAllSystems (
        { pkgs, ... }:
        {
          default = pkgs.mkShell {
            packages = with pkgs; [
              cargo
              rustc
              rust-analyzer
              clippy
              rustfmt
              pkg-config
              openssl
              sqlite
            ];
          };
        }
      );

      formatter = forAllSystems ({ treefmt-eval, ... }: treefmt-eval.config.build.wrapper);

      checks = forAllSystems (
        {
          pkgs,
          craneLib,
          commonArgs,
          cargoArtifacts,
          treefmt-eval,
          ...
        }:
        {
          formatting = treefmt-eval.config.build.check self;
          build = self.packages.${pkgs.stdenv.hostPlatform.system}.default;
          clippy = craneLib.cargoClippy (
            commonArgs
            // {
              inherit cargoArtifacts;
              cargoClippyExtraArgs = "--all-targets";
            }
          );
          tests = craneLib.cargoTest (
            commonArgs
            // {
              inherit cargoArtifacts;
            }
          );
        }
      );
    };
}