{
  description = "matrix-ops-bot - webhook daemon for Matrix operations";

  inputs = {
    nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1";
    pyproject-nix = {
      url = "github:pyproject-nix/pyproject.nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    uv2nix = {
      url = "github:pyproject-nix/uv2nix";
      inputs.pyproject-nix.follows = "pyproject-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    pyproject-build-systems = {
      url = "github:pyproject-nix/build-system-pkgs";
      inputs.pyproject-nix.follows = "pyproject-nix";
      inputs.uv2nix.follows = "uv2nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    {
      self,
      nixpkgs,
      pyproject-nix,
      uv2nix,
      pyproject-build-systems,
      ...
    }:
    let
      systems = [ "x86_64-linux" ];
      forAllSystems = fn: nixpkgs.lib.genAttrs systems (system: fn nixpkgs.legacyPackages.${system});

      workspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./.; };
      overlay = workspace.mkPyprojectOverlay { sourcePreference = "wheel"; };
      pyprojectOverrides = final: prev: {
        atomicwrites = prev.atomicwrites.overrideAttrs (old: {
          nativeBuildInputs = (old.nativeBuildInputs or [ ]) ++ [ final.setuptools ];
        });
        termcolor = prev.termcolor.overrideAttrs (old: {
          nativeBuildInputs = (old.nativeBuildInputs or [ ]) ++ [ final.setuptools ];
        });
      };

      mkModuleWithDefaultPackage =
        modulePath:
        {
          lib,
          pkgs,
          ...
        }:
        let
          system = pkgs.stdenv.hostPlatform.system;
        in
        {
          imports = [ modulePath ];
          services.matrix-ops-bot.package = lib.mkDefault (
            if builtins.hasAttr system self.packages then self.packages.${system}.default else null
          );
        };

      mkPackage =
        pkgs:
        let
          pythonSet =
            (pkgs.callPackage pyproject-nix.build.packages {
              python = pkgs.python311;
            }).overrideScope
              (
                pkgs.lib.composeManyExtensions [
                  pyproject-build-systems.overlays.default
                  overlay
                  pyprojectOverrides
                ]
              );

          baseVenv = pythonSet.mkVirtualEnv "matrix-ops-bot-env" workspace.deps.default;
          testVenv = pythonSet.mkVirtualEnv "matrix-ops-bot-test-env" {
            matrix-ops-bot = [ "dev" ];
          };

          tests = pkgs.stdenv.mkDerivation {
            name = "matrix-ops-bot-tests";
            src = ./.;
            dontConfigure = true;
            dontBuild = true;
            nativeBuildInputs = [ testVenv ];
            checkPhase = ''
              runHook preCheck
              export HOME="$(mktemp -d)"
              pytest tests/ -v
              runHook postCheck
            '';
            doCheck = true;
            installPhase = ''
              mkdir -p "$out"
              touch "$out/passed"
            '';
          };

          templateAssets = pkgs.runCommand "matrix-ops-bot-templates" { } ''
            mkdir -p $out/share/matrix-ops-bot
            cp -r ${./templates} $out/share/matrix-ops-bot/templates
          '';

          runtimeEntrypoint = pkgs.writeShellScriptBin "matrix-ops-bot" ''
            exec "${baseVenv}/bin/python" -m ops_bot.main "$@"
          '';
          runtimePackage = pkgs.symlinkJoin {
            name = "matrix-ops-bot-env";
            paths = [
              baseVenv
              templateAssets
              runtimeEntrypoint
            ];
          };
        in
        pkgs.runCommand "matrix-ops-bot-env"
          {
            inherit (runtimePackage) meta;
            passthru = {
              inherit tests testVenv runtimePackage;
            };
          }
          ''
            test -f "${tests}/passed"
            ln -s "${runtimePackage}" "$out"
          '';
    in
    {
      formatter = forAllSystems (pkgs: pkgs.nixfmt);

      nixosModules = {
        default = mkModuleWithDefaultPackage ./nix/modules/nixos;
        matrix-ops-bot = mkModuleWithDefaultPackage ./nix/modules/nixos/services/matrix-ops-bot.nix;
      };

      packages = forAllSystems (
        pkgs:
        let
          pkg = mkPackage pkgs;
        in
        {
          matrix-ops-bot = pkg;
          default = pkg;
        }
      );

      apps = forAllSystems (
        pkgs:
        let
          package = self.packages.${pkgs.stdenv.hostPlatform.system}.matrix-ops-bot;
        in
        {
          matrix-ops-bot = {
            type = "app";
            program = "${package}/bin/matrix-ops-bot";
            meta.description = "Matrix Ops Bot runtime";
          };
          default = {
            type = "app";
            program = "${package}/bin/matrix-ops-bot";
            meta.description = "Matrix Ops Bot runtime";
          };
        }
      );

      checks = forAllSystems (
        pkgs:
        let
          system = pkgs.stdenv.hostPlatform.system;
          exportedPackage = self.packages.${system}.default;
          testVenv = exportedPackage.testVenv;
          src = ./.;
          ruffCheck = pkgs.stdenv.mkDerivation {
            name = "matrix-ops-bot-ruff";
            inherit src;
            dontConfigure = true;
            dontBuild = true;
            nativeBuildInputs = [ testVenv ];
            checkPhase = ''
              runHook preCheck
              ruff check ops_bot/ tests/
              ruff format --check ops_bot/ tests/
              runHook postCheck
            '';
            doCheck = true;
            installPhase = ''
              mkdir -p "$out"
              touch "$out/passed"
            '';
          };
          pyrightCheck = pkgs.stdenv.mkDerivation {
            name = "matrix-ops-bot-pyright";
            inherit src;
            dontConfigure = true;
            dontBuild = true;
            nativeBuildInputs = [
              testVenv
              pkgs.nodejs
            ];
            checkPhase = ''
              runHook preCheck
              export HOME="$(mktemp -d)"
              pyright ops_bot/
              runHook postCheck
            '';
            doCheck = true;
            installPhase = ''
              mkdir -p "$out"
              touch "$out/passed"
            '';
          };
        in
        {
          package-default = exportedPackage;
          tests = exportedPackage.tests;
          ruff = ruffCheck;
          pyright = pyrightCheck;
        }
      );

      devShells = forAllSystems (pkgs: {
        default = pkgs.mkShell {
          packages = [
            pkgs.python311
            pkgs.uv
            pkgs.ruff
            pkgs.pyright
          ];
          env.LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath [
            pkgs.stdenv.cc.cc
          ];
        };
      });
    };
}