Add sensors to Xbox integration (#41868)

* favorited friends binary sensors

* add binary_sensor to .coveragerc

* fix copy/paste comments...

* make sensor entities instead of attributes

* address PR review comments

* default state to None

homeassistant/components/xbox/base_sensor.py

@@ -0,0 +1,63 @@
+"""Base Sensor for the Xbox Integration."""
+from typing import Optional
+
+from homeassistant.helpers.update_coordinator import CoordinatorEntity
+
+from . import PresenceData, XboxUpdateCoordinator
+from .const import DOMAIN
+
+
+class XboxBaseSensorEntity(CoordinatorEntity):
+    """Base Sensor for the Xbox Integration."""
+
+    def __init__(self, coordinator: XboxUpdateCoordinator, xuid: str, attribute: str):
+        """Initialize Xbox binary sensor."""
+        super().__init__(coordinator)
+        self.xuid = xuid
+        self.attribute = attribute
+
+    @property
+    def unique_id(self) -> str:
+        """Return a unique, Home Assistant friendly identifier for this entity."""
+        return f"{self.xuid}_{self.attribute}"
+
+    @property
+    def data(self) -> Optional[PresenceData]:
+        """Return coordinator data for this console."""
+        return self.coordinator.data.presence.get(self.xuid)
+
+    @property
+    def name(self) -> str:
+        """Return the name of the sensor."""
+        if not self.data:
+            return None
+
+        if self.attribute == "online":
+            return self.data.gamertag
+
+        attr_name = " ".join([part.title() for part in self.attribute.split("_")])
+        return f"{self.data.gamertag} {attr_name}"
+
+    @property
+    def entity_picture(self) -> str:
+        """Return the gamer pic."""
+        if not self.data:
+            return None
+
+        return self.data.display_pic.replace("&mode=Padding", "")
+
+    @property
+    def entity_registry_enabled_default(self) -> bool:
+        """Return if the entity should be enabled when first added to the entity registry."""
+        return self.attribute == "online"
+
+    @property
+    def device_info(self):
+        """Return a device description for device registry."""
+        return {
+            "identifiers": {(DOMAIN, "xbox_live")},
+            "name": "Xbox Live",
+            "manufacturer": "Microsoft",
+            "model": "Xbox Live",
+            "entry_type": "service",
+        }