import ./make-test-python.nix ({ pkgs, lib, ... }:

let
  configDir = "/var/lib/foobar";
in {
  name = "home-assistant";
  meta.maintainers = lib.teams.home-assistant.members;

  nodes.hass = { pkgs, ... }: {
    services.postgresql = {
      enable = true;
      ensureDatabases = [ "hass" ];
      ensureUsers = [{
        name = "hass";
        ensurePermissions = {
          "DATABASE hass" = "ALL PRIVILEGES";
        };
      }];
    };

    services.home-assistant = {
      enable = true;
      inherit configDir;

      # provide dependencies through package overrides
      package = (pkgs.home-assistant.override {
        extraPackages = ps: with ps; [
          colorama
        ];
        extraComponents = [
          # test char-tty device allow propagation into the service
          "zha"
         ];
      });

      # provide component dependencies explicitly from the module
      extraComponents = [
        "mqtt"
      ];

      # provide package for postgresql support
      extraPackages = python3Packages: with python3Packages; [
        psycopg2
      ];

      config = {
        homeassistant = {
          name = "Home";
          time_zone = "UTC";
          latitude = "0.0";
          longitude = "0.0";
          elevation = 0;
        };

        # configure the recorder component to use the postgresql db
        recorder.db_url = "postgresql://@/hass";

        # we can't load default_config, because the updater requires
        # network access and would cause an error, so load frontend
        # here explicitly.
        # https://www.home-assistant.io/integrations/frontend/
        frontend = {};

        # include some popular integrations, that absolutely shouldn't break
        knx = {};
        shelly = {};
        zha = {};

        # set up a wake-on-lan switch to test capset capability required
        # for the ping suid wrapper
        # https://www.home-assistant.io/integrations/wake_on_lan/
        switch = [ {
          platform = "wake_on_lan";
          mac = "00:11:22:33:44:55";
          host = "127.0.0.1";
        } ];

        # test component-based capability assignment (CAP_NET_BIND_SERVICE)
        # https://www.home-assistant.io/integrations/emulated_hue/
        emulated_hue = {
          host_ip = "127.0.0.1";
          listen_port = 80;
        };

        # https://www.home-assistant.io/integrations/logger/
        logger = {
          default = "info";
        };
      };

      # configure the sample lovelace dashboard
      lovelaceConfig = {
        title = "My Awesome Home";
        views = [{
          title = "Example";
          cards = [{
            type = "markdown";
            title = "Lovelace";
            content = "Welcome to your **Lovelace UI**.";
          }];
        }];
      };
      lovelaceConfigWritable = true;
    };

    # Cause a configuration change inside `configuration.yml` and verify that the process is being reloaded.
    specialisation.differentName = {
      inheritParentConfig = true;
      configuration.services.home-assistant.config.homeassistant.name = lib.mkForce "Test Home";
    };

    # Cause a configuration change that requires a service restart as we added a new runtime dependency
    specialisation.newFeature = {
      inheritParentConfig = true;
      configuration.services.home-assistant.config.backup = {};
    };
  };

  testScript = { nodes, ... }: let
    system = nodes.hass.system.build.toplevel;
  in
  ''
    import json

    start_all()


    def get_journal_cursor() -> str:
        exit, out = hass.execute("journalctl -u home-assistant.service -n1 -o json-pretty --output-fields=__CURSOR")
        assert exit == 0
        return json.loads(out)["__CURSOR"]


    def get_journal_since(cursor) -> str:
        exit, out = hass.execute(f"journalctl --after-cursor='{cursor}' -u home-assistant.service")
        assert exit == 0
        return out


    def get_unit_property(property) -> str:
        exit, out = hass.execute(f"systemctl show --property={property} home-assistant.service")
        assert exit == 0
        return out


    def wait_for_homeassistant(cursor):
        hass.wait_until_succeeds(f"journalctl --after-cursor='{cursor}' -u home-assistant.service | grep -q 'Home Assistant initialized in'")


    hass.wait_for_unit("home-assistant.service")
    cursor = get_journal_cursor()

    with subtest("Check that YAML configuration file is in place"):
        hass.succeed("test -L ${configDir}/configuration.yaml")

    with subtest("Check the lovelace config is copied because lovelaceConfigWritable = true"):
        hass.succeed("test -f ${configDir}/ui-lovelace.yaml")

    with subtest("Check that Home Assistant's web interface and API can be reached"):
        wait_for_homeassistant(cursor)
        hass.wait_for_open_port(8123)
        hass.succeed("curl --fail http://localhost:8123/lovelace")

    with subtest("Check that optional dependencies are in the PYTHONPATH"):
        env = get_unit_property("Environment")
        python_path = env.split("PYTHONPATH=")[1].split()[0]
        for package in ["colorama", "paho-mqtt", "psycopg2"]:
            assert package in python_path, f"{package} not in PYTHONPATH"

    with subtest("Check that declaratively configured components get setup"):
        journal = get_journal_since(cursor)
        for domain in ["emulated_hue", "wake_on_lan"]:
            assert f"Setup of domain {domain} took" in journal, f"{domain} setup missing"

    with subtest("Check that capabilities are passed for emulated_hue to bind to port 80"):
        hass.wait_for_open_port(80)
        hass.succeed("curl --fail http://localhost:80/description.xml")

    with subtest("Check extra components are considered in systemd unit hardening"):
        hass.succeed("systemctl show -p DeviceAllow home-assistant.service | grep -q char-ttyUSB")

    with subtest("Check service reloads when configuration changes"):
        pid = hass.succeed("systemctl show --property=MainPID home-assistant.service")
        cursor = get_journal_cursor()
        hass.succeed("${system}/specialisation/differentName/bin/switch-to-configuration test")
        new_pid = hass.succeed("systemctl show --property=MainPID home-assistant.service")
        assert pid == new_pid, "The PID of the process should not change between process reloads"
        wait_for_homeassistant(cursor)

    with subtest("Check service restarts when dependencies change"):
        pid = new_pid
        cursor = get_journal_cursor()
        hass.succeed("${system}/specialisation/newFeature/bin/switch-to-configuration test")
        new_pid = hass.succeed("systemctl show --property=MainPID home-assistant.service")
        assert pid != new_pid, "The PID of the process should change when its PYTHONPATH changess"
        wait_for_homeassistant(cursor)

    with subtest("Check that new components get setup after restart"):
        journal = get_journal_since(cursor)
        for domain in ["backup"]:
            assert f"Setup of domain {domain} took" in journal, f"{domain} setup missing"

    with subtest("Check that no errors were logged"):
        hass.fail("journalctl -u home-assistant -o cat | grep -q ERROR")

    with subtest("Check systemd unit hardening"):
        hass.log(hass.succeed("systemctl cat home-assistant.service"))
        hass.log(hass.succeed("systemd-analyze security home-assistant.service"))
  '';
})