From 0770df9ef8a3fd0ebdbf0be948822795e36ac913 Mon Sep 17 00:00:00 2001
From: Steffen Helmke <golarg@t-online.de>
Date: Wed, 5 Jan 2022 19:10:57 +0100
Subject: [PATCH] 4gewinnt: testForWin diagonal left win

---
 .../java/de/tims/viergewinnt/ai/Logic.java    | 20 ++++++++++++++++++-
 .../de/tims/viergewinnt/ai/LogicTest.java     |  9 ++++++++-
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/src/main/java/de/tims/viergewinnt/ai/Logic.java b/src/main/java/de/tims/viergewinnt/ai/Logic.java
index eb5afa5..7dc55bc 100644
--- a/src/main/java/de/tims/viergewinnt/ai/Logic.java
+++ b/src/main/java/de/tims/viergewinnt/ai/Logic.java
@@ -26,7 +26,7 @@ public class Logic {
 		}
 		chain = 0;
 		for(int i = 0; i < playfield.length - 3; i++) {
-			for(int j = 0; j < playfield[i].length; j++) {
+			for(int j = 0; j < playfield[i].length - 3; j++) {
 				if(playfield[i][j] == player) {
 					chain++;
 					while(true) {
@@ -42,6 +42,24 @@ public class Logic {
 				}
 			}
 		}
+		chain = 0;
+		for(int i = 0; i < playfield.length - 3; i++) {
+			for(int j = playfield[i].length - 1; j > 2; j--) {
+				if(playfield[i][j] == player) {
+					chain++;
+					while(true) {
+						i++; j--;
+						if(playfield[i][j] == player) {
+							chain++;
+							if(chain == 4) return true;
+						} else {
+							chain = 0;
+							break;
+						}
+					}
+				}
+			}
+		}
 		return false;
 	}
 }
diff --git a/src/test/java/de/tims/viergewinnt/ai/LogicTest.java b/src/test/java/de/tims/viergewinnt/ai/LogicTest.java
index 091ff8c..d6c0ad4 100644
--- a/src/test/java/de/tims/viergewinnt/ai/LogicTest.java
+++ b/src/test/java/de/tims/viergewinnt/ai/LogicTest.java
@@ -53,12 +53,19 @@ class LogicTest {
 							  {1, 1, 0, 0, 0, 0},
 							  {2, 2, 1, 0, 0, 0},
 							  {2, 2, 2, 1, 0, 0}};
+		int[][] playfield5 = {{0, 0, 0, 0, 0, 0}, 
+				  			  {0, 0, 0, 0, 0, 0},
+				  			  {0, 0, 0, 0, 0, 1},
+				  			  {0, 0, 0, 0, 1, 2},
+				  			  {0, 0, 0, 1, 2, 2},
+				  			  {0, 0, 1, 1, 2, 2}};
 		return Stream.of(
 				Arguments.of("emptyField", new int[6][6], 1, false),
 				Arguments.of("4 in column1 player1", playfield1, 1, true),
 				Arguments.of("4 in a column player1", playfield2, 1, true),
 				Arguments.of("4 in a row player1", playfield3, 1, true),
-				Arguments.of("4 diagonal right player1", playfield4, 1, true)
+				Arguments.of("4 diagonal right player1", playfield4, 1, true),
+				Arguments.of("4 diagonal left player1", playfield5, 1, true)
 				);
 	}