Pre and post conditions

core/src/me/msoucy/ptures/model/Creature.kt

@@ -58,7 +58,7 @@ class Creature {
     fun hits(creature : Creature, damage : Damage) =
             random(100) < damage.accuracy + spd - creature.spd
 
-    inline fun <reified S : Status> hasStatus() = statuses.filter { it is S }.isNotEmpty()
+    inline fun <reified S : Status> hasStatus() = statuses.filterIsInstance<S>().isNotEmpty()
 
     private fun statFormula(gene : Int, growth : Int) = (2 * gene + growth / 4) * level / 100 + 5
 }

core/src/me/msoucy/ptures/model/Engine.kt

@@ -11,13 +11,22 @@ class Engine(private vararg val creatures : Pair<Creature, Int>) {
         return creatures[currentCreature].first
     }
 
-    fun resolveTurn() {
-        val activeCreatures = creatures.withIndex()
+    val activeCreatures get() = creatures.withIndex()
             .filter { (_, c) -> !c.first.hasStatus<KnockedOut>() }
             .sortedBy { (_, c) -> c.first.spd }
+            .map { (i, _) -> i}
+
+    fun resolveTurn() {
+        // All preconditions
+        for (i in activeCreatures) {
+            val creature = creatures[i]
+            for (status in creature.first.statuses) {
+                status.onTurnStart(this)
+            }
+        }
         // Get the moves each creature will use this turn
-        val moves = activeCreatures.map { (_, _) -> Pair(Ignore, 0) }
-        for ((i, c) in activeCreatures) {
+        val moves = activeCreatures.map { i -> Pair(Ignore, nextOpponent(i)) }
+        for (i in activeCreatures) {
             // Resolve move
             val (skill, target) = moves[i]
             currentCreature = i
@@ -37,6 +46,13 @@ class Engine(private vararg val creatures : Pair<Creature, Int>) {
                 }
             }
         }
+        // All post conditions
+        for (i in activeCreatures) {
+            val creature = creatures[i]
+            for (status in creature.first.statuses) {
+                status.onTurnEnd(this)
+            }
+        }
     }
 
     private fun getTargetList(target : Target, selected : Int) : List<Int> {
@@ -48,4 +64,16 @@ class Engine(private vararg val creatures : Pair<Creature, Int>) {
             Target.All -> creatures.indices.toList()
         }
     }
+
+    private fun nextOpponent(idx : Int) : Int {
+        var nextIdx = idx + 1
+        while (nextIdx != idx) {
+            if (creatures[nextIdx].second != creatures[idx].second) {
+                return nextIdx
+            }
+            nextIdx = (nextIdx + 1) % creatures.size
+        }
+        // There are no opponents... so use the "none" index
+        return -1
+    }
 }