Implement debug switching

Assets/Scripts/Services/GameBoardService.cs

@@ -155,6 +155,52 @@ namespace Services {
             this.currentState = GameState.Move;
             return true;
         }
+
+        public async UniTask<bool> TrySwitch(Vector2Int position) {
+            Gem gem = this.gameBoard.GetGemAt(position);
+            if(gem == null)
+                return false;
+            
+            GemType[] normalTypes = Enum.GetValues(typeof(GemType))
+                .Cast<GemType>()
+                .Where(t => t != GemType.Bomb)
+                .ToArray();
+
+            if (normalTypes.Length == 0)
+                return false;
+            
+            bool nextIsBomb;
+            GemType nextTypeOrMatchColor;
+
+            if (gem.Type != GemType.Bomb) {
+                int index = Array.IndexOf(normalTypes, gem.Type);
+                if (index < 0) index = 0;
+
+                if (index < normalTypes.Length - 1) {
+                    nextIsBomb = false;
+                    nextTypeOrMatchColor = normalTypes[index + 1];
+                } else {
+                    nextIsBomb = true;
+                    nextTypeOrMatchColor = normalTypes[0]; 
+                }
+            } else {
+                int idx = Array.IndexOf(normalTypes, gem.MatchColor);
+                if (idx < 0) idx = 0;
+
+                if (idx < normalTypes.Length - 1) {
+                    nextIsBomb = true;
+                    nextTypeOrMatchColor = normalTypes[idx + 1];
+                } else {
+                    nextIsBomb = false;
+                    nextTypeOrMatchColor = normalTypes[0];
+                }
+            }
+
+            // Replace both model+view by releasing current and respawning at same position.
+            ReleaseMatchedGems(position);
+            SpawnGemGameObject(SetGemAt(position, nextTypeOrMatchColor, nextIsBomb), nextIsBomb);
+            return true;
+        }
         
         private void ApplySwap(Vector2Int from, Vector2Int to) {
             Gem fromGem = this.gameBoard.GetGemAt(from);