allow resetting games

src/Core/Bag.cpp

@@ -19,6 +19,19 @@ Bag::Bag(std::shared_ptr<PiecesList> piecesList) :
     this->prepareNext();
 }
 
+void Bag::jumpToNextBag() {
+    // if the bag is empty switch to the next bag
+    if (this->currentBag.empty()) {
+        std::swap(this->currentBag, this->nextBag);
+    }
+
+    // get the already used pieces back to the current bag
+    for (const std::pair<int, int>& pieceIndex : this->nextBag) {
+        this->currentBag.emplace_back(pieceIndex);
+    }
+    this->nextBag.clear();
+}
+
 Piece Bag::lookNext() {
     return this->piecesList->getPiece(this->next);
 }