AI_CompareDamagingMoves changes to increase the score by 1 for best moves

src/battle_ai_main.c

@@ -3169,8 +3169,9 @@ static u32 GetAIMostDamagingMoveId(u32 battlerAtk, u32 battlerDef)
 
 static s32 AI_CompareDamagingMoves(u32 battlerAtk, u32 battlerDef, u32 currId)
 {
-    u32 i;
+    u32 i, bestViableMoveSc0re;
     bool32 multipleBestMoves = FALSE;
+    u32 viableMoveScores[MAX_MON_MOVES];
     s32 noOfHits[MAX_MON_MOVES];
     s32 score = 0;
     s32 leastHits = 1000, leastHitsId = 0;
@@ -3187,11 +3188,13 @@ static s32 AI_CompareDamagingMoves(u32 battlerAtk, u32 battlerDef, u32 currId)
                 leastHits = noOfHits[i];
                 leastHitsId = i;
             }
+            viableMoveScores[i] = 100;
             isPowerfulIgnoredEffect[i] = IsInIgnoredPowerfulMoveEffects(gBattleMoves[moves[i]].effect);
         }
         else
         {
             noOfHits[i] = -1;
+            viableMoveScores[i] = 0;
             isPowerfulIgnoredEffect[i] = FALSE;
         }
         /*
@@ -3217,19 +3220,45 @@ static s32 AI_CompareDamagingMoves(u32 battlerAtk, u32 battlerDef, u32 currId)
                 multipleBestMoves = TRUE;
                 // We need to make sure it's the current move which is objectively better.
                 if (isPowerfulIgnoredEffect[i] && !isPowerfulIgnoredEffect[currId])
-                    ADJUST_SCORE(3);
-                else if (CompareMoveAccuracies(battlerAtk, battlerDef, currId, i) == 0)
-                    ADJUST_SCORE(2);
-                else if (AI_WhichMoveBetter(moves[currId], moves[i], battlerAtk, battlerDef, noOfHits[currId]) == 0)
+                    viableMoveScores[i] -= 3;
+                else if (!isPowerfulIgnoredEffect[i] && isPowerfulIgnoredEffect[currId])
+                    viableMoveScores[currId] -= 3;
+
+                switch (CompareMoveAccuracies(battlerAtk, battlerDef, currId, i))
                 {
-                    // MgbaPrintf_("%S better than %S", gMoveNames[moves[currId]], gMoveNames[moves[i]]);
-                    ADJUST_SCORE(1);
+                case 0:
+                    viableMoveScores[i] -= 2;
+                    break;
+                case 1:
+                    viableMoveScores[currId] -= 2;
+                    break;
+                }
+                switch (AI_WhichMoveBetter(moves[currId], moves[i], battlerAtk, battlerDef, noOfHits[currId]))
+                {
+                case 0:
+                    viableMoveScores[i] -= 1;
+                    break;
+                case 1:
+                    viableMoveScores[currId] -= 1;
+                    break;
                 }
             }
         }
         // Turns out the current move deals the most dmg compared to the other 3.
         if (!multipleBestMoves)
             ADJUST_SCORE(1);
+        else
+        {
+            bestViableMoveSc0re = 0;
+            for (i = 0; i < MAX_MON_MOVES; i++)
+            {
+                if (viableMoveScores[i] > bestViableMoveSc0re)
+                    bestViableMoveSc0re = viableMoveScores[i];
+            }
+            // Unless a better move was found increase score of current move
+            if (viableMoveScores[currId] == bestViableMoveSc0re)
+                ADJUST_SCORE(1);
+        }
     }
 
     return score;

test/battle/ai.c

@@ -93,6 +93,9 @@ AI_SINGLE_BATTLE_TEST("AI prefers moves with better accuracy, but only if they b
     PARAMETRIZE { move1 = MOVE_MEGA_KICK; move2 = MOVE_SLAM; move3 = MOVE_TACKLE; move4 = MOVE_GUST; hp = 5; expectedMove = MOVE_GUST; expectedMove2 = MOVE_TACKLE; turns = 1; }
     // All moves hit with No guard ability
     PARAMETRIZE { move1 = MOVE_MEGA_KICK; move2 = MOVE_GUST; hp = 5; expectedMove = MOVE_MEGA_KICK; expectedMove2 = MOVE_GUST; turns = 1; }
+    // Tests to compare move that always hits and a beneficial effect. A move with higher acc should be chosen in this case.
+    PARAMETRIZE { move1 = MOVE_SHOCK_WAVE; move2 = MOVE_ICY_WIND; hp = 5; expectedMove = MOVE_SHOCK_WAVE; turns = 1; }
+    PARAMETRIZE { move1 = MOVE_SHOCK_WAVE; move2 = MOVE_ICY_WIND; move3 = MOVE_THUNDERBOLT; hp = 5; expectedMove = MOVE_SHOCK_WAVE; expectedMove2 = MOVE_THUNDERBOLT; turns = 1; }
 
     GIVEN {
         AI_FLAGS(AI_FLAG_CHECK_BAD_MOVE | AI_FLAG_CHECK_VIABILITY | AI_FLAG_TRY_TO_FAINT);
@@ -105,6 +108,9 @@ AI_SINGLE_BATTLE_TEST("AI prefers moves with better accuracy, but only if they b
         ASSUME(gBattleMoves[MOVE_MEGA_KICK].accuracy < gBattleMoves[MOVE_STRENGTH].accuracy);
         ASSUME(gBattleMoves[MOVE_TACKLE].accuracy == 100);
         ASSUME(gBattleMoves[MOVE_GUST].accuracy == 100);
+        ASSUME(gBattleMoves[MOVE_SHOCK_WAVE].accuracy == 0);
+        ASSUME(gBattleMoves[MOVE_THUNDERBOLT].accuracy == 100);
+        ASSUME(gBattleMoves[MOVE_ICY_WIND].accuracy == 95);
         OPPONENT(SPECIES_EXPLOUD) { Moves(move1, move2, move3, move4); Ability(abilityAtk); SpAttack(50); } // Low Sp.Atk, so Swift deals less damage than Strength.
     } WHEN {
             switch (turns)
@@ -192,6 +198,65 @@ AI_SINGLE_BATTLE_TEST("AI prefers Earthquake over Drill Run if both require the
     }
 }
 
+AI_SINGLE_BATTLE_TEST("AI prefers a weaker move over a one with a downside effect if both require the same number of hits to ko")
+{
+    u16 move1 = MOVE_NONE, move2 = MOVE_NONE, move3 = MOVE_NONE, move4 = MOVE_NONE;
+    u16 hp, expectedMove, turns;
+
+    // Both moves require the same number of turns but Flamethrower will be chosen over Overheat (powerful effect)
+    PARAMETRIZE { move1 = MOVE_OVERHEAT; move2 = MOVE_FLAMETHROWER; hp = 300; expectedMove = MOVE_FLAMETHROWER; turns = 2; }
+    // Overheat kill in least amount of turns
+    PARAMETRIZE { move1 = MOVE_OVERHEAT; move2 = MOVE_FLAMETHROWER; hp = 250; expectedMove = MOVE_OVERHEAT; turns = 1; }
+
+    GIVEN {
+        AI_FLAGS(AI_FLAG_CHECK_BAD_MOVE | AI_FLAG_CHECK_VIABILITY | AI_FLAG_TRY_TO_FAINT);
+        PLAYER(SPECIES_WOBBUFFET) { HP(hp); }
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_TYPHLOSION) { Moves(move1, move2); }
+    } WHEN {
+        switch (turns)
+        {
+        case 1:
+            TURN { EXPECT_MOVE(opponent, expectedMove); SEND_OUT(player, 1); }
+            break;
+        case 2:
+            TURN { EXPECT_MOVE(opponent, expectedMove); }
+            TURN { EXPECT_MOVE(opponent, expectedMove); SEND_OUT(player, 1); }
+            break;
+        }
+    }
+    SCENE {
+        MESSAGE("Wobbuffet fainted!");
+    }
+}
+
+AI_SINGLE_BATTLE_TEST("AI prefers moves with the best possible score, chosen randomly if tied")
+{
+    GIVEN {
+        AI_FLAGS(AI_FLAG_CHECK_BAD_MOVE | AI_FLAG_CHECK_VIABILITY | AI_FLAG_TRY_TO_FAINT);
+        PLAYER(SPECIES_WOBBUFFET) { HP(5); };
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_WOBBUFFET) { Moves(MOVE_THUNDERBOLT, MOVE_SLUDGE_BOMB, MOVE_TAKE_DOWN); }
+    } WHEN {
+        TURN { EXPECT_MOVES(opponent, MOVE_THUNDERBOLT, MOVE_SLUDGE_BOMB); SEND_OUT(player, 1); }
+    }
+    SCENE {
+        MESSAGE("Wobbuffet fainted!");
+    }
+}
+
+AI_SINGLE_BATTLE_TEST("AI can choose a stat boosting move randomly")
+{
+    GIVEN {
+        AI_FLAGS(AI_FLAG_CHECK_BAD_MOVE | AI_FLAG_CHECK_VIABILITY | AI_FLAG_TRY_TO_FAINT);
+        PLAYER(SPECIES_WOBBUFFET);
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_WOBBUFFET) { Moves(MOVE_THUNDERBOLT, MOVE_SLUDGE_BOMB, MOVE_SWORDS_DANCE); }
+    } WHEN {
+        TURN { EXPECT_MOVES(opponent, MOVE_THUNDERBOLT, MOVE_SLUDGE_BOMB, MOVE_SWORDS_DANCE); }
+    }
+}
+
 AI_SINGLE_BATTLE_TEST("AI chooses the safest option to faint the target, taking into account accuracy and move effect")
 {
     u16 move1 = MOVE_NONE, move2 = MOVE_NONE, move3 = MOVE_NONE, move4 = MOVE_NONE;