feat(hass): add synced input_text for brightness control

configurations/homie/modules/home-assistant/frontend.nix

@@ -124,6 +124,14 @@ in {
       }
     ];
 
+    # TODO: restrict to 0-100
+    config.input_text = {
+      bathroom_light_brightness = {
+        name = "BathroomLightBrightness";
+        pattern = "[0-9]*";
+      };
+    };
+
     lovelaceConfig = {
       title = "Our House";
       # I don't want multiple views

configurations/homie/modules/home-assistant/netdaemon/apps/Frontend/BathroomLight/BathroomLight.cs

@@ -0,0 +1,58 @@
+using System;
+
+using HomeAssistantGenerated;
+
+using NetDaemon.AppModel;
+using NetDaemon.HassModel.Entities;
+
+
+namespace NetDaemonConfig.Apps.Frontend.BathroomLight
+{
+    [NetDaemonApp]
+    public class BathroomLight
+    {
+        public BathroomLight(Services services, Entities entities)
+        {
+            LightEntity? bathroomLight = entities.Light.Tz3210KatchgxyTs0505bLight;
+            InputTextEntity? bathroomLightBrightness = entities.InputText.BathroomLightBrightness;
+
+            var brightnessCallback = (Action<double, double> callback) =>
+            {
+                double? currentBrightness = bathroomLight?.Attributes?.Brightness;
+
+                if (currentBrightness is not null)
+                {
+                    double currentBrightnessPercent = Math.Floor((double)currentBrightness / 2.54);
+                    double inputBrightnessPercent = Double.Parse(bathroomLightBrightness.State ?? "0");
+
+                    if (currentBrightnessPercent != inputBrightnessPercent)
+                    {
+                        callback(currentBrightnessPercent, inputBrightnessPercent);
+                    }
+                }
+            };
+
+            bathroomLightBrightness
+                .StateAllChanges()
+                .Subscribe((_) => brightnessCallback((current, input) =>
+                {
+                    services.Light.TurnOn(
+                        target: ServiceTarget.FromEntity("light.tz3210_katchgxy_ts0505b_light"),
+                        brightness: Math.Floor(input * 2.54 + 1));
+                }));
+
+            bathroomLight
+                .StateAllChanges()
+                .Subscribe((_) => brightnessCallback((current, input) =>
+                {
+                    bathroomLightBrightness.SetValue(current.ToString());
+                }));
+
+            // Init value
+            brightnessCallback((current, input) =>
+                {
+                    bathroomLightBrightness.SetValue(current.ToString());
+                });
+        }
+    }
+}