rework color system and make it work with drivers.

internal/drivers/hue2/bridge.go

@@ -269,7 +269,7 @@ func (b *Bridge) MakeCongruent(ctx context.Context) (int, error) {
 			lightsOut := light.Power != nil && !device.State.Power
 			if !lightsOut {
 				if light.ColorTemperature != nil && device.State.Color.IsKelvin() {
-					mirek := 1000000 / device.State.Color.Kelvin
+					mirek := 1000000 / *device.State.Color.K
 					if mirek < light.ColorTemperature.MirekSchema.MirekMinimum {
 						mirek = light.ColorTemperature.MirekSchema.MirekMinimum
 					}
@@ -280,9 +280,10 @@ func (b *Bridge) MakeCongruent(ctx context.Context) (int, error) {
 						update.Mirek = &mirek
 						changed = true
 					}
-				} else if xy, ok := device.State.Color.ToXY(); ok && light.Color != nil {
-					xy = light.Color.Gamut.Conform(xy).Round()
+				} else if xyColor, ok := device.State.Color.ToXY(); ok && light.Color != nil {
+					xy := light.Color.Gamut.Conform(*xyColor.XY).Round()
 					if xy.DistanceTo(light.Color.XY) > 0.0009 || (light.ColorTemperature != nil && light.ColorTemperature.Mirek != nil) {
+						log.Println(xyColor.String(), device.State.Color.String())
 						update.ColorXY = &xy
 						changed = true
 					}
@@ -419,9 +420,7 @@ func (b *Bridge) GenerateDevices() []models.Device {
 					}
 					if light.ColorTemperature != nil {
 						if light.ColorTemperature.Mirek != nil {
-							device.State.Color = models.ColorValue{
-								Kelvin: int(1000000 / *light.ColorTemperature.Mirek),
-							}
+							device.State.Color.SetK(1000000 / *light.ColorTemperature.Mirek)
 						}
 						device.Capabilities = append(device.Capabilities, models.DCColorKelvin)
 						device.DriverProperties["maxTemperature"] = 1000000 / light.ColorTemperature.MirekSchema.MirekMinimum
@@ -530,9 +529,11 @@ func (b *Bridge) applyPatches(patches []ResourceData) {
 				resCopy.Color = &cp
 				resCopy.Color.XY = patch.Color.XY
 
-				cp2 := *resCopy.ColorTemperature
-				resCopy.ColorTemperature = &cp2
-				resCopy.ColorTemperature.Mirek = nil
+				if resCopy.ColorTemperature != nil {
+					cp2 := *resCopy.ColorTemperature
+					resCopy.ColorTemperature = &cp2
+					resCopy.ColorTemperature.Mirek = nil
+				}
 			}
 			if patch.ColorTemperature != nil && resCopy.ColorTemperature != nil {
 				cp := *resCopy.ColorTemperature