Add new Forecasting to Weather (#75219)

* Add new Forecasting to Weather

* Add is_daytime for forecast_twice_daily

* Fix test

* Fix demo test

* Adjust tests

* Fix typing

* Add demo

* Mod demo more realistic

* Fix test

* Remove one weather

* Fix weather example

* kitchen_sink

* Reverse demo partially

* mod kitchen sink

* Fix twice_daily

* kitchen_sink

* Add test weathers

* Add twice daily to demo

* dt_util

* Fix names

* Expose forecast via WS instead of as state attributes

* Regularly update demo + kitchen_sink weather forecasts

* Run linters

* Fix rebase mistake

* Improve demo test coverage

* Improve weather test coverage

* Exclude kitchen_sink weather from test coverage

* Rename async_update_forecast to async_update_listeners

* Add async_has_listeners helper

* Revert "Add async_has_listeners helper"

This reverts commit 52af3664bb06d9feac2c5ff963ee0022077c23ba.

* Fix rebase mistake

---------

Co-authored-by: Erik <erik@montnemery.com>

tests/components/weather/test_websocket_api.py

@@ -1,8 +1,12 @@
 """Test the weather websocket API."""
+from homeassistant.components.weather import WeatherEntityFeature
 from homeassistant.components.weather.const import DOMAIN
+from homeassistant.const import UnitOfTemperature
 from homeassistant.core import HomeAssistant
 from homeassistant.setup import async_setup_component
 
+from . import create_entity
+
 from tests.typing import WebSocketGenerator
 
 
@@ -31,3 +35,118 @@ async def test_device_class_units(
             "wind_speed_unit": ["ft/s", "km/h", "kn", "m/s", "mph"],
         }
     }
+
+
+async def test_subscribe_forecast(
+    hass: HomeAssistant,
+    hass_ws_client: WebSocketGenerator,
+    enable_custom_integrations: None,
+) -> None:
+    """Test multiple forecast."""
+
+    entity0 = await create_entity(
+        hass,
+        native_temperature=38,
+        native_temperature_unit=UnitOfTemperature.CELSIUS,
+        supported_features=WeatherEntityFeature.FORECAST_DAILY,
+    )
+
+    client = await hass_ws_client(hass)
+
+    await client.send_json_auto_id(
+        {
+            "type": "weather/subscribe_forecast",
+            "forecast_type": "daily",
+            "entity_id": entity0.entity_id,
+        }
+    )
+    msg = await client.receive_json()
+    assert msg["success"]
+    assert msg["result"] is None
+    subscription_id = msg["id"]
+
+    msg = await client.receive_json()
+    assert msg["id"] == subscription_id
+    assert msg["type"] == "event"
+    forecast = msg["event"]
+    assert forecast == {
+        "type": "daily",
+        "forecast": [
+            {
+                "cloud_coverage": None,
+                "temperature": 38.0,
+                "templow": 38.0,
+                "uv_index": None,
+                "wind_bearing": None,
+            }
+        ],
+    }
+
+    await entity0.async_update_listeners(None)
+    msg = await client.receive_json()
+    assert msg["event"] == forecast
+
+    await entity0.async_update_listeners(["daily"])
+    msg = await client.receive_json()
+    assert msg["event"] == forecast
+
+    entity0.forecast_list = None
+    await entity0.async_update_listeners(None)
+    msg = await client.receive_json()
+    assert msg["event"] == {"type": "daily", "forecast": None}
+
+
+async def test_subscribe_forecast_unknown_entity(
+    hass: HomeAssistant,
+    hass_ws_client: WebSocketGenerator,
+    enable_custom_integrations: None,
+) -> None:
+    """Test multiple forecast."""
+
+    assert await async_setup_component(hass, DOMAIN, {})
+
+    client = await hass_ws_client(hass)
+
+    await client.send_json_auto_id(
+        {
+            "type": "weather/subscribe_forecast",
+            "forecast_type": "daily",
+            "entity_id": "weather.unknown",
+        }
+    )
+    msg = await client.receive_json()
+    assert not msg["success"]
+    assert msg["error"] == {
+        "code": "invalid_entity_id",
+        "message": "Weather entity not found: weather.unknown",
+    }
+
+
+async def test_subscribe_forecast_unsupported(
+    hass: HomeAssistant,
+    hass_ws_client: WebSocketGenerator,
+    enable_custom_integrations: None,
+) -> None:
+    """Test multiple forecast."""
+
+    entity0 = await create_entity(
+        hass,
+        native_temperature=38,
+        native_temperature_unit=UnitOfTemperature.CELSIUS,
+    )
+
+    client = await hass_ws_client(hass)
+
+    await client.send_json_auto_id(
+        {
+            "type": "weather/subscribe_forecast",
+            "forecast_type": "daily",
+            "entity_id": entity0.entity_id,
+        }
+    )
+    msg = await client.receive_json()
+    assert not msg["success"]
+    assert msg["error"] == {
+        "code": "forecast_not_supported",
+        "message": "The weather entity does not support forecast type: daily",
+    }