PlayersHands class

src/main/kotlin/eventDemo/app/entity/PlayersHands.kt

@@ -0,0 +1,37 @@
+package eventDemo.app.entity
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+@JvmInline
+value class PlayersHands(
+    private val map: Map<Player, List<Card>> = emptyMap(),
+) : Map<Player, List<Card>> by map {
+    constructor(players: Set<Player>) : this(players.associateWith { emptyList<Card>() }.toPlayersHands())
+
+    fun removeCard(
+        player: Player,
+        card: Card,
+    ): PlayersHands =
+        mapValues { (p, cards) ->
+            if (p == player) {
+                cards - card
+            } else {
+                cards
+            }
+        }.toPlayersHands()
+
+    fun addCards(
+        player: Player,
+        newCards: List<Card>,
+    ): PlayersHands =
+        mapValues { (p, cards) ->
+            if (p == player) {
+                cards + newCards
+            } else {
+                cards
+            }
+        }.toPlayersHands()
+}
+
+fun Map<Player, List<Card>>.toPlayersHands(): PlayersHands = PlayersHands(this)