it is literally working

modules/events-schema/src/commonMain/kotlin/dev/adamko/kafkatorio/events/schema/factorioEvents.kt

@@ -11,13 +11,18 @@ import kotlinx.serialization.json.JsonClassDiscriminator
 @Serializable
 data class FactorioEvent<out T : FactorioObjectData>(
   /** the initial Factorio event ({defines.events}) trigger */
-  @SerialName("event_type") val eventType: String,
+  @SerialName("event_type")
+  val eventType: String,
   /** Schema versioning */
-  @SerialName("mod_version") val modVersion: String,
-  @SerialName("factorio_version") val factorioVersion: String,
+  @SerialName("mod_version")
+  val modVersion: String,
+  @SerialName("factorio_version")
+  val factorioVersion: String,
   /** game time */
-  @SerialName("tick") val tick: UInt,
-  @SerialName("data") val data: T
+  @SerialName("tick")
+  val tick: UInt,
+  @SerialName("data")
+  val data: T
 )
 
 
@@ -53,10 +58,20 @@ sealed class FactorioObjectData {
 @SerialName("LuaPlayer")
 data class PlayerData(
   @Serializable(with = ListAsObjectSerializer::class)
-  @SerialName("associated_characters_unit_numbers") val associatedCharactersUnitNumbers: List<UInt>,
-  @SerialName("character_unit_number") val characterUnitNumber: UInt?,
-  @SerialName("name") val name: String,
-  @SerialName("position") val position: PositionData,
+  @SerialName("associated_characters_unit_numbers")
+  val associatedCharactersUnitNumbers: List<UInt>,
+  @SerialName("character_unit_number")
+  val characterUnitNumber: UInt?,
+  @SerialName("name")
+  val name: String,
+  @SerialName("position")
+  val position: PositionData,
+  @SerialName("colour")
+  val colour: Colour,
+  @SerialName("chat_colour")
+  val chatColour: Colour,
+  @SerialName("last_online")
+  val lastOnline: UInt,
 ) : FactorioObjectData() {
   @Transient
   override val objectName: String = "LuaPlayer"
@@ -65,16 +80,25 @@ data class PlayerData(
 @Serializable
 @SerialName("LuaEntity")
 data class EntityData(
-  @SerialName("active") val active: Boolean,
-  @SerialName("health") val health: Double?,
-  @SerialName("health_ratio") val healthRatio: Double,
-  @SerialName("name") val name: String,
-  @SerialName("position") val position: PositionData,
-  @SerialName("surface_index") val surfaceIndex: Int,
-  @SerialName("type") val type: String,
-  @SerialName("unit_number") val unitNumber: UInt? = null,
+  @SerialName("active")
+  val active: Boolean,
+  @SerialName("health")
+  val health: Double?,
+  @SerialName("health_ratio")
+  val healthRatio: Double,
+  @SerialName("name")
+  val name: String,
+  @SerialName("position")
+  val position: PositionData,
+  @SerialName("surface_index")
+  val surfaceIndex: Int,
+  @SerialName("type")
+  val type: String,
+  @SerialName("unit_number")
+  val unitNumber: UInt? = null,
 
-  @SerialName("player_index") val playerIndex: UInt? = null,
+  @SerialName("player_index")
+  val playerIndex: UInt? = null,
 ) : FactorioObjectData() {
   @Transient
   override val objectName: String = "LuaEntity"
@@ -83,9 +107,12 @@ data class EntityData(
 @Serializable
 @SerialName("LuaSurface")
 data class SurfaceData(
-  @SerialName("daytime") val daytime: Double,
-  @SerialName("index") val index: UInt,
-  @SerialName("name") val name: String,
+  @SerialName("daytime")
+  val daytime: Double,
+  @SerialName("index")
+  val index: UInt,
+  @SerialName("name")
+  val name: String,
 ) : FactorioObjectData() {
   @Transient
   override val objectName: String = "LuaSurface"
@@ -93,6 +120,32 @@ data class SurfaceData(
 
 @Serializable
 data class PositionData(
-  @SerialName("x") val x: Double,
-  @SerialName("y") val y: Double,
+  val x: Double,
+  val y: Double,
 )
+
+/**
+ * Red, green, blue and alpha values, all in range `[0, 1]` or all in range `[0, 255]` if any
+ * value is > 1.
+ *
+ * All values here are optional. Color channels default to 0, the alpha channel defaults to 1.
+ */
+@Serializable
+data class Colour(
+  val red: Float = 0f,
+  val green: Float = 0f,
+  val blue: Float = 0f,
+  val alpha: Float = 1f,
+) {
+  /** True if any value is greater than 1, so the values are hexadecimal. */
+  fun isDecimal(): Boolean {
+    return red > 1f
+        || green > 1f
+        || blue > 1f
+        || alpha > 1f
+  }
+
+  /** True if all values are between `[0..1]`. */
+  fun isPercentage(): Boolean = !isDecimal()
+
+}

modules/events-schema/src/jvmTest/kotlin/dev/adamko/kafkatorio/events/schema/FactorioEventTest.kt

@@ -21,7 +21,8 @@ class FactorioEventTest : BehaviorSpec({
           "position": {
             "x": -3.5703125,
             "y": 29.75
-          }
+          },
+          "last_online": 123
         },
         "event_type": "on_player_joined_game",
         "mod_version": "0.0.4",
@@ -41,7 +42,10 @@ class FactorioEventTest : BehaviorSpec({
           position = PositionData(
             x = -3.5703125,
             y = 29.75
-          )
+          ),
+          colour = Colour(),
+          chatColour = Colour(),
+          lastOnline = 123u
         ),
         eventType = "on_player_joined_game",
         modVersion = "0.0.4",