Improve domain (WIP)

composeApp/src/commonMain/kotlin/domain/Game.kt

@@ -1,23 +1,27 @@
 package domain
 
-const val PUZZLE_SIZE = 6
+import kotlin.reflect.KClass
 
 class Game(
-    val categories: List<ItemCategory>,
     val grid: Grid,
-    val horizontalRules: List<HorizontalRule>,
-    val verticalRules: List<VerticalRule>
+    val rules: List<GameRule>
 ) {
-    fun areCategoriesValid(): Boolean = categories.mapIndexed { index, category ->
-        category.any { item ->
-            categories.filterIndexed { i, _ -> i > index }.any { it.contains(item) }
+    val horizontalRules = rules.filterIsInstance<HorizontalRule>()
+    val verticalRules = rules.filterIsInstance<VerticalRule>()
+    
+    fun areCategoriesValid(): Boolean {
+        val usedCategories = mutableSetOf<KClass<out ItemClass>>()
+        for (row in grid.rows) {
+            val category = row.first().options.first()::class
+            if (usedCategories.contains(category)) {
+                return false
+            }
+            usedCategories.add(category)
         }
-    }.none { it }
+        return true
+    }
 
-    fun areRulesViolated(): Boolean = horizontalRules
-        .map { it.isRuleViolated(grid) }
-        .reduce { a, b -> a || b }
-            || verticalRules
+    fun areRulesViolated(): Boolean = rules
         .map { it.isRuleViolated(grid) }
         .reduce { a, b -> a || b }
 }