From f60515c6444b37882c33f88e743c3061195a7bf7 Mon Sep 17 00:00:00 2001
From: Nick Stolbov <nick.stolbov@informatik.hs-fulda.de>
Date: Sun, 30 Jan 2022 23:48:21 +0100
Subject: [PATCH] Added validateMove method to ChessBoard with test for
 validating every move on the board

---
 src/main/java/Game/ChessObj/ChessBoard.java   | 34 ++++++++++
 .../java/Game/ChessObj/ChessBoardTest.java    | 64 +++++++++++++++++++
 2 files changed, 98 insertions(+)

diff --git a/src/main/java/Game/ChessObj/ChessBoard.java b/src/main/java/Game/ChessObj/ChessBoard.java
index f7f0f3b..f46138c 100644
--- a/src/main/java/Game/ChessObj/ChessBoard.java
+++ b/src/main/java/Game/ChessObj/ChessBoard.java
@@ -82,6 +82,40 @@ public class ChessBoard {
         return false;
     }
 
+    public boolean validateMove(int sourceX, int sourceY, int destX, int destY) {
+        //Destination not in board range
+        if (!isCellInBoard(sourceX, sourceY) || !isCellInBoard(destX, destY))
+            return false;
+        ChessFigure figure = board[sourceY][sourceX];
+        //Destination has same Team
+        if(board[destY][destX] != null)
+            if(board[destY][destX].getTeam() == figure.getTeam())
+                return false;
+        int deltaX = destX - sourceX;
+        int deltaY = sourceY - destY;
+        //Pawn special case
+        if(figure.getType() == ChessFigure.Type.PAWN){
+            if(board[destY][destX] != null) {
+                if (board[destY][destX].getTeam() == figure.getTeam())
+                    return false;
+                if (figure.getTeam() == ChessFigure.Team.WHITE && board[destY][destX].getTeam() != figure.getTeam() && (deltaX == -1 || deltaX == 1) && deltaY == 1)
+                    return true;
+                if (figure.getTeam() == ChessFigure.Team.BLACK && board[destY][destX].getTeam() != figure.getTeam() && (deltaX == -1 || deltaX == 1) && deltaY == -1)
+                    return true;
+            }
+            if(figure.isRelativeMoveValid(deltaX, deltaY))
+                return true;
+        }
+        if(figure.isRelativeMoveValid(deltaX, deltaY)){
+            if(figure.getType() == ChessFigure.Type.KNIGHT)
+                return true;
+            if(validateCleanPath(sourceX, sourceY, destX, destY))
+                return true;
+        }
+
+        return false;
+    }
+
     protected boolean validateCleanPath(int sourceX, int sourceY, final int destX, final int destY) {
         int deltaX = destX - sourceX;
         int deltaY = destY - sourceY;
diff --git a/src/test/java/Game/ChessObj/ChessBoardTest.java b/src/test/java/Game/ChessObj/ChessBoardTest.java
index 459b95a..489f0df 100644
--- a/src/test/java/Game/ChessObj/ChessBoardTest.java
+++ b/src/test/java/Game/ChessObj/ChessBoardTest.java
@@ -97,4 +97,68 @@ class ChessBoardTest {
         assertTrue(chessBoard.validateCleanPath(7, 3, 5, 5));
         assertFalse(chessBoard.validateCleanPath(7, 3, 6, 6));
     }
+
+    /*
+            0     1     2     3     4     5     6     7
+         ┌─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┐
+      0  │     │     │     │     │     │     │     │     │
+         ├─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
+      1  │     │     │     │     │     │     │     │     │
+         ├─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
+      2  │     │     │     │     │  o  │     │     │     │
+         ├─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
+      3  │     │     │     │ |o| │     │ |o| │     │     │
+         ├─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
+      4  │     │     │  o  │     │  o  │     │     │     │
+         ├─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
+      5  │     │     │     │ |o| │     │     │ |T| │     │
+         ├─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
+      6  │     │     │     │     │     │     │     │     │
+         ├─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
+      7  │     │     │  T  │     │  B  │     │     │     │
+         └─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘
+     */
+    @Test
+    void validateMove() {
+        ChessFigure[][] tempBoard = new ChessFigure[8][8];
+
+        tempBoard[4][2] = new ChessFigure(ChessFigure.Type.PAWN, ChessFigure.Team.WHITE);
+        tempBoard[4][4] = new ChessFigure(ChessFigure.Type.PAWN, ChessFigure.Team.WHITE);
+        tempBoard[2][4] = new ChessFigure(ChessFigure.Type.PAWN, ChessFigure.Team.WHITE);
+        tempBoard[3][3] = new ChessFigure(ChessFigure.Type.PAWN, ChessFigure.Team.BLACK);
+        tempBoard[3][5] = new ChessFigure(ChessFigure.Type.PAWN, ChessFigure.Team.BLACK);
+        tempBoard[5][3] = new ChessFigure(ChessFigure.Type.PAWN, ChessFigure.Team.BLACK);
+        tempBoard[7][2] = new ChessFigure(ChessFigure.Type.CASTLE, ChessFigure.Team.WHITE);
+        tempBoard[7][4] = new ChessFigure(ChessFigure.Type.BISHOP, ChessFigure.Team.WHITE);
+        tempBoard[5][6] = new ChessFigure(ChessFigure.Type.CASTLE, ChessFigure.Team.BLACK);
+
+        chessBoard.setChessBoard(tempBoard);
+
+        //White pawn normal move
+        assertTrue(chessBoard.validateMove(4, 2, 4, 1));
+        assertFalse(chessBoard.validateMove(4, 2, 4, 3));
+        assertFalse(chessBoard.validateMove(4, 2, 3, 1));
+        assertFalse(chessBoard.validateMove(4, 2, 5, 1));
+        //White pawn beats Black
+        assertTrue(chessBoard.validateMove(4, 4, 3, 3));
+        assertTrue(chessBoard.validateMove(4, 4, 5, 3));
+        //Black pawn normal move
+        assertTrue(chessBoard.validateMove(3, 5, 3, 6));
+        assertFalse(chessBoard.validateMove(3, 5, 3, 4));
+        assertFalse(chessBoard.validateMove(3, 5, 2, 6));
+        assertFalse(chessBoard.validateMove(3, 5, 6, 6));
+        //Black pawn beats White
+        assertTrue(chessBoard.validateMove(3, 3, 2, 4));
+        assertTrue(chessBoard.validateMove(3, 3, 4, 4));
+
+        //CastleMoves for testing global rules
+        assertTrue(chessBoard.validateMove(2, 7, 2, 5));
+        assertFalse(chessBoard.validateMove(2, 7, 2, 4));
+        assertFalse(chessBoard.validateMove(2, 7, 2, 2));
+
+        //Bishop Moves for testing global moves
+        assertTrue(chessBoard.validateMove(4, 7, 5, 6));
+        assertTrue(chessBoard.validateMove(4, 7, 6, 5));
+        assertFalse(chessBoard.validateMove(4, 7, 7, 4));
+    }
 }
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