Add function to adjust AI scoring for generalized item effects (#6247)

include/battle_ai_main.h

@@ -35,7 +35,7 @@ typedef s32 (*AiScoreFunc)(u32, u32, u32, s32);
 #define POWERFUL_STATUS_MOVE     10 // Moves with this score will be chosen over a move that faints target
 #define NO_DAMAGE_OR_FAILS      -20 // Move fails or does no damage
 
-// Scores given in AI_CalcMoveEffectScore
+// Scores given in AI_CalcMoveEffectScore and AI_CalcHoldEffectMoveScore
 #define NO_INCREASE      0
 #define WEAK_EFFECT      1
 #define DECENT_EFFECT    2

include/config/ai.h

@@ -43,6 +43,9 @@
 #define SHOULD_SWITCH_REGENERATOR_PERCENTAGE                        50
 #define SHOULD_SWITCH_REGENERATOR_STATS_RAISED_PERCENTAGE           20
 
+// AI held item-based move scoring
+#define BLUNDER_POLICY_ACCURACY_THRESHOLD                     75 // Moves with accuracy equal below this value are prioritized when holding Blunder Policy  
+
 // AI prediction chances
 #define PREDICT_SWITCH_CHANCE                                   50
 

src/battle_ai_main.c

@@ -3295,6 +3295,34 @@ static s32 AI_CompareDamagingMoves(u32 battlerAtk, u32 battlerDef, u32 currId)
     return score;
 }
 
+static u32 AI_CalcHoldEffectMoveScore(u32 battlerAtk, u32 battlerDef, u32 move)
+{
+    struct AiLogicData *aiData = AI_DATA;
+    u32 holdEffect = aiData->holdEffects[battlerAtk];
+
+    s32 score = 0;
+
+    switch (holdEffect)
+    {
+    case HOLD_EFFECT_BLUNDER_POLICY:
+    {
+        u32 moveAcc = aiData->moveAccuracy[battlerAtk][battlerDef][AI_THINKING_STRUCT->movesetIndex];
+
+        if (moveAcc <= BLUNDER_POLICY_ACCURACY_THRESHOLD)
+        {
+            ADJUST_SCORE(GOOD_EFFECT);
+        }
+        else
+        {
+            ADJUST_SCORE(-DECENT_EFFECT);
+        }
+    }
+    break;
+    }
+
+    return score;
+}
+
 static u32 AI_CalcMoveEffectScore(u32 battlerAtk, u32 battlerDef, u32 move)
 {
     // move data
@@ -4831,6 +4859,7 @@ static s32 AI_CheckViability(u32 battlerAtk, u32 battlerDef, u32 move, s32 score
     }
 
     ADJUST_SCORE(AI_CalcMoveEffectScore(battlerAtk, battlerDef, move));
+    ADJUST_SCORE(AI_CalcHoldEffectMoveScore(battlerAtk, battlerDef, move));
 
     return score;
 }