initial commit

src/Core/Bag.cpp

@@ -0,0 +1,50 @@
+#include "Bag.h"
+
+#include "../Pieces/Piece.h"
+
+#include <Vector>
+#include <cstdlib>
+
+
+Bag::Bag(const std::vector<Piece>& pieces) : pieces(pieces) {
+    // initialize bags
+    this->currentBag.clear();
+    for (int i = 0; i < this->pieces.size(); i++) {
+        this->currentBag.push_back(i);
+    }
+    this->nextBag.clear();
+
+    // prepare first piece
+    this->prepareNext();
+}
+
+Piece Bag::lookNext() {
+    // return the next piece
+    return this->pieces.at(this->next);
+}
+
+Piece Bag::getNext() {
+    // get the piece to return
+    int nextIndex = this->next;
+
+    // prepare the piece even after the next
+    this->prepareNext();
+
+    // return the next piece
+    return this->pieces.at(nextIndex);
+}
+
+void Bag::prepareNext() {
+    // if the bag is empty switch to the next bag
+    if (this->currentBag.empty()) {
+        std::swap(this->currentBag, this->nextBag);
+    }
+
+    // pick a random piece from the current bag
+    int indexIndex = std::rand() % this->currentBag.size();
+    this->next = this->currentBag.at(indexIndex);
+
+    // move the piece over to the next bag
+    this->nextBag.push_back(this->next);
+    this->currentBag.erase(this->currentBag.begin() + indexIndex);
+}