Add diagnostics to Nanoleaf (#64835)

.coveragerc

@@ -716,6 +716,7 @@ omit =
     homeassistant/components/nad/media_player.py
     homeassistant/components/nanoleaf/__init__.py
     homeassistant/components/nanoleaf/button.py
+    homeassistant/components/nanoleaf/diagnostics.py
     homeassistant/components/nanoleaf/entity.py
     homeassistant/components/nanoleaf/light.py
     homeassistant/components/neato/__init__.py

homeassistant/components/nanoleaf/diagnostics.py

@@ -0,0 +1,45 @@
+"""Diagnostics support for Nanoleaf."""
+from __future__ import annotations
+
+from aionanoleaf import Nanoleaf
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import CONF_TOKEN
+from homeassistant.core import HomeAssistant
+
+from .const import DOMAIN
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant,
+    config_entry: ConfigEntry,
+) -> dict:
+    """Return diagnostics for a config entry."""
+    device: Nanoleaf = hass.data[DOMAIN][config_entry.entry_id].device
+
+    return {
+        "info": async_redact_data(config_entry.as_dict(), (CONF_TOKEN, "title")),
+        "data": {
+            "brightness_max": device.brightness_max,
+            "brightness_min": device.brightness_min,
+            "brightness": device.brightness,
+            "color_mode": device.color_mode,
+            "color_temperature_max": device.color_temperature_max,
+            "color_temperature_min": device.color_temperature_min,
+            "color_temperature": device.color_temperature,
+            "effect": device.effect,
+            "effects_list": device.effects_list,
+            "firmware_version": device.firmware_version,
+            "hue_max": device.hue_max,
+            "hue_min": device.hue_min,
+            "hue": device.hue,
+            "is_on": device.is_on,
+            "manufacturer": device.manufacturer,
+            "port": device.port,
+            "saturation_max": device.saturation_max,
+            "saturation_min": device.saturation_min,
+            "saturation": device.saturation,
+            "serial_no": device.serial_no,
+        },
+    }