Added a new Contradiction Rule

src/main/java/edu/rpi/legup/puzzle/kakurasu/rules/UnreachableSumContradictionRule.java

@@ -0,0 +1,59 @@
+package edu.rpi.legup.puzzle.kakurasu.rules;
+
+import edu.rpi.legup.model.gameboard.Board;
+import edu.rpi.legup.model.gameboard.PuzzleElement;
+import edu.rpi.legup.model.rules.ContradictionRule;
+import edu.rpi.legup.puzzle.kakurasu.KakurasuBoard;
+import edu.rpi.legup.puzzle.kakurasu.KakurasuCell;
+import edu.rpi.legup.puzzle.kakurasu.KakurasuType;
+
+import java.awt.*;
+import java.util.List;
+
+public class UnreachableSumContradictionRule extends ContradictionRule {
+    public UnreachableSumContradictionRule() {
+        super(
+                "KAKU-CONT-0003",
+                "Unreachable Sum",
+                "The combination of available values cannot exactly land on the clue's value.",
+                "edu/rpi/legup/images/kakurasu/temp.png");
+    }
+
+    /**
+     * Checks whether the transition has a contradiction at the specific puzzleElement index using
+     * this rule
+     *
+     * @param board board to check contradiction
+     * @param puzzleElement equivalent puzzleElement
+     * @return null if the transition contains a contradiction at the specified puzzleElement,
+     *     otherwise error message
+     */
+    @Override
+    public String checkContradictionAt(Board board, PuzzleElement puzzleElement) {
+        KakurasuBoard kakurasuBoard = (KakurasuBoard) board;
+        KakurasuCell cell = (KakurasuCell) puzzleElement;
+
+        // TODO: Finish this rule
+
+        Point loc = cell.getLocation();
+        List<KakurasuCell> filledRow = kakurasuBoard.getRowCol(loc.y, KakurasuType.FILLED, true);
+        List<KakurasuCell> unknownRow = kakurasuBoard.getRowCol(loc.y, KakurasuType.UNKNOWN, true);
+        List<KakurasuCell> filledCol = kakurasuBoard.getRowCol(loc.x, KakurasuType.FILLED, false);
+        List<KakurasuCell> unknownCol = kakurasuBoard.getRowCol(loc.x, KakurasuType.UNKNOWN, false);
+
+        int rowValueRemaining = kakurasuBoard.getClue(kakurasuBoard.getWidth(), loc.y).getData();
+        for(KakurasuCell kc : filledRow) {
+            rowValueRemaining -= kc.getLocation().x + 1;
+        }
+        int colValueRemaining = kakurasuBoard.getClue(loc.x, kakurasuBoard.getHeight()).getData();
+        for(KakurasuCell kc : filledCol) {
+            colValueRemaining -= kc.getLocation().y + 1;
+        }
+
+        if (true) {
+            return null;
+        } else {
+            return super.getNoContradictionMessage();
+        }
+    }
+}

src/main/java/edu/rpi/legup/puzzle/kakurasu/rules/kakurasu_reference_sheet.txt

@@ -5,6 +5,6 @@ KAKU-BASC-0003 : RequiredFilledDirectRule
 
 KAKU-CONT-0001 : ExceededSumContradictionRule
 KAKU-CONT-0002 : IncompleteSumContradictionRule
-
+KAKU-CONT-0003 : UnreachableSumContradictionRule
 
 KAKU-CASE-0001 : A