refractoring

app/src/main/java/sudoku/solver/Solver.java

@@ -1,17 +1,16 @@
 package sudoku.solver;
 
-import sudoku.Cell;
 import sudoku.MultiDoku;
 import sudoku.MutableCell;
-import sudoku.Sudoku;
 import sudoku.constraint.IConstraint;
 
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Random;
+import java.util.Stack;
 
 public class Solver {
-    Caretaker stack;
+    Stack<MutableCell> stack;
 
     public Solver() {
     }
@@ -26,12 +25,21 @@ public class Solver {
         while (!remainingCellsToCheck.isEmpty()) {
             int indexCurrentCell = rand.nextInt(remainingCellsToCheck.size());
             MutableCell currentCell = remainingCellsToCheck.get(indexCurrentCell);
-            if (currentCell.getHints().isEmpty()){
-                MutableCell modify = stack.undo();
-                modify.removeHint(modify.clear());
+            if (currentCell.getPossibleSymbols().isEmpty()){
+                MutableCell modify = stack.pop();
+                modify.removeSymbolFromPossibilities(modify.clearCurrentSymbol());
+            } else {
+                int symbol = currentCell.getPossibleSymbols().get(0);
+                currentCell.setSymbolIndex(symbol);
+                stack.push(currentCell);
+                //TODO check constraints integrity in sudoku
+
+
             }
 
 
+
+
             remainingCellsToCheck.remove(indexCurrentCell);
         }
         return doku;