{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    mitel-ommclient2 = {
      url = "git+https://git.clerie.de/clerie/mitel_ommclient2.git";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };
  outputs = { self, nixpkgs, mitel-ommclient2, ... }: let
    fieldpoc_version = "0.11.0";
  in {
    packages.x86_64-linux = let
      pkgs = import nixpkgs {
        system = "x86_64-linux";
      };
    in {
      fieldpoc = pkgs.python3Packages.buildPythonPackage {
        pname = "fieldpoc";
        version = fieldpoc_version;

        src = ./.;

        format = "pyproject";

        buildInputs = [ pkgs.python3Packages.hatchling ];
        propagatedBuildInputs = [
          mitel-ommclient2.packages.x86_64-linux.mitel-ommclient2
          pkgs.python3Packages.sqlalchemy
          self.packages.x86_64-linux.ywsd
          self.packages.x86_64-linux.diffsync
        ];
      };

      ywsd = pkgs.python3Packages.buildPythonApplication rec {
        pname = "ywsd";
        version = "0.12.2";

        src = pkgs.fetchFromGitHub {
          owner = "eventphone";
          repo = pname;
          rev = "v${version}";
          sha256 = "sha256-VkL7MhK6Z0Y1Hnnoq0Ukyclk9gfc4u8qav6yNj+LCJg=";
        };

        propagatedBuildInputs = [
          pkgs.python3Packages.aiopg
          pkgs.python3Packages.aiohttp
          self.packages.x86_64-linux.python-yate
          pkgs.python3Packages.pyyaml
          pkgs.python3Packages.sqlalchemy
        ];

        doCheck = false;
      };

      python-yate = pkgs.python3Packages.buildPythonPackage rec {
        pname = "python-yate";
        version = "0.4.1";

        src = pkgs.python3Packages.fetchPypi {
          inherit pname version;
          sha256 = "sha256-rx0hcmP4SmvCkKXawyiMTKCVpTKTAgZVpbdQFdxV+hs=";
        };

        propagatedBuildInputs = [
          pkgs.python3Packages.aiohttp
          pkgs.python3Packages.async-timeout
        ];

        pythonImportsCheck = [ "yate" ];
      };


      diffsync = pkgs.python3Packages.buildPythonPackage rec {
        pname = "diffsync";
        version = "1.5.1";

        src = pkgs.python3Packages.fetchPypi {
          inherit pname version;
          sha256 = "84a736d03d385bd07cf7c86f57385d4130c3c3273bf7bc90febe2fa530ee1aa6";
        };

        propagatedBuildInputs = [
          pkgs.python3Packages.pydantic
          (pkgs.python3Packages.override {
            overrides = (self: super: {
              structlog = super.structlog.overrideAttrs (old: rec {
                version = "21.5.0";
                src = pkgs.fetchFromGitHub {
                  owner = "hynek";
                  repo = "structlog";
                  rev = "refs/tags/${version}";
                  sha256 = "0bc5lj0732j0hjq89llgrncyzs6k3aaffvg07kr3la44w0hlrb4l";
                };
              });
            });
          }).structlog
          pkgs.python3Packages.colorama
          pkgs.python3Packages.redis
        ];

        pythonImportsCheck = [ "diffsync" ];
      };

      yate = pkgs.yate.overrideAttrs (old: {
        configureFlags = [ "--with-libpq=${pkgs.postgresql.withPackages (ps: [ ])}" ];
      });

      docs = pkgs.stdenv.mkDerivation {
        pname = "fieldpoc-docs";
        version = fieldpoc_version;

        src = ./.;

        buildInputs = [
          pkgs.python3.pkgs.mkdocs-material
        ];

        buildPhase = ''
          python3 -m mkdocs build
        '';

        installPhase = ''
          mkdir -p $out
          cp -r ./site/* $out/
        '';
      };
    };

    nixosModules = {
      fieldpoc = { ... }: {
        imports = [
          ./nix/modules/dhcp.nix
          ./nix/modules/fieldpoc.nix
          ./nix/modules/yate.nix
        ];

        nixpkgs.overlays = [
          (_: _: {
            inherit (self.packages."x86_64-linux")
              fieldpoc
              yate;
          })
        ];
      };
      default = self.nixosModules.fieldpoc;
    };

    hydraJobs = {
      inherit (self)
        packages;
    };
  };
}