{ lib, fetchurl, fetchFromGitHub, fetchpatch, python3, protobuf3_6

# Look up dependencies of specified components in component-packages.nix
, extraComponents ? [ ]

# Additional packages to add to propagatedBuildInputs
, extraPackages ? ps: []

# Override Python packages using
# self: super: { pkg = super.pkg.overridePythonAttrs (oldAttrs: { ... }); }
# Applied after defaultOverrides
, packageOverrides ? self: super: {
  # TODO: Remove this override after updating to cryptography 2.8:

}

# Skip pip install of required packages on startup
, skipPip ? true }:

let

  defaultOverrides = [
    # Override the version of some packages pinned in Home Assistant's setup.py

    # used by check_config script
    # can be unpinned once https://github.com/home-assistant/home-assistant/issues/11917 is resolved
    (mkOverride "colorlog" "4.0.2"
      "3cf31b25cbc8f86ec01fef582ef3b840950dea414084ed19ab922c8b493f9b42")

    (mkOverride "pyyaml" "5.1.2"
      "1r5faspz73477hlbjgilw05xsms0glmsa371yqdd26znqsvg1b81")

    # required by aioesphomeapi
    (self: super: {
      protobuf = super.protobuf.override {
        protobuf = protobuf3_6;
      };
    })

    # hass-frontend does not exist in python3.pkgs
    (self: super: {
      hass-frontend = self.callPackage ./frontend.nix { };
    })
  ];

  mkOverride = attrname: version: sha256:
    self: super: {
      ${attrname} = super.${attrname}.overridePythonAttrs (oldAttrs: {
        inherit version;
        src = oldAttrs.src.override {
          inherit version sha256;
        };
      });
    };

  py = python3.override {
    # Put packageOverrides at the start so they are applied after defaultOverrides
    packageOverrides = lib.foldr lib.composeExtensions (self: super: { }) ([ packageOverrides ] ++ defaultOverrides);
  };

  componentPackages = import ./component-packages.nix;

  availableComponents = builtins.attrNames componentPackages.components;

  getPackages = component: builtins.getAttr component componentPackages.components;

  componentBuildInputs = lib.concatMap (component: getPackages component py.pkgs) extraComponents;

  # Ensure that we are using a consistent package set
  extraBuildInputs = extraPackages py.pkgs;

  # Don't forget to run parse-requirements.py after updating
  hassVersion = "0.103.6";

in with py.pkgs; buildPythonApplication rec {
  pname = "homeassistant";
  version = assert (componentPackages.version == hassVersion); hassVersion;

  disabled = pythonOlder "3.5";

  inherit availableComponents;

  # PyPI tarball is missing tests/ directory
  src = fetchFromGitHub {
    owner = "home-assistant";
    repo = "home-assistant";
    rev = version;
    sha256 = "1492q4icyhvz30fw5ysrwlnsls4iy5pv62ay3vq1ygcfnlapkqhl";
  };

  propagatedBuildInputs = [
    # From setup.py
    aiohttp astral async-timeout attrs bcrypt certifi importlib-metadata jinja2
    pyjwt cryptography pip python-slugify pytz pyyaml requests ruamel_yaml
    setuptools voluptuous voluptuous-serialize
    # From http, frontend and recorder components and auth.mfa_modules.totp
    sqlalchemy aiohttp-cors hass-frontend pyotp pyqrcode
  ] ++ componentBuildInputs ++ extraBuildInputs;

  checkInputs = [
    asynctest pytest pytest-aiohttp requests-mock pydispatcher aiohue netdisco hass-nabucasa
  ];

  patches = [
    # newer importlib-metadata version
    (fetchpatch {
      url = "https://github.com/home-assistant/home-assistant/commit/63c6b803dc2d835d57b97ed833ee5cd8318bf7ae.patch";
      sha256 = "16q3qdnmgsw5415f70zvsv1z63dljp3c9glv06cyj4s6qsl13xdc";
    })
  ];

  postPatch = ''
    substituteInPlace setup.py \
      --replace "aiohttp==3.6.1" "aiohttp" \
      --replace "attrs==19.2.0" "attrs" \
      --replace "ruamel.yaml==0.15.100" "ruamel.yaml"
  '';

  checkPhase = ''
    # - components' dependencies are not included, so they cannot be tested
    # - test_merge_id_schema requires pyqwikswitch
    # - unclear why test_merge fails: assert merge_log_err.call_count != 0
    py.test --ignore tests/components -k "not test_merge_id_schema and not test_merge"
    # Some basic components should be tested however
    py.test \
      tests/components/{api,config,configurator,demo,discovery,frontend,group,history,history_graph} \
      tests/components/{homeassistant,http,logger,script,shell_command,system_log,websocket_api}
  '';

  makeWrapperArgs = lib.optional skipPip "--add-flags --skip-pip";

  meta = with lib; {
    homepage = https://home-assistant.io/;
    description = "Open-source home automation platform running on Python 3";
    license = licenses.asl20;
    maintainers = with maintainers; [ dotlambda globin ];
  };
}