From b8512a169325780aeb5c29688c37b0616dad083f Mon Sep 17 00:00:00 2001
From: Malte Tammena <malte.tammena@gmx.de>
Date: Fri, 20 Oct 2017 23:05:15 +0200
Subject: [PATCH] IO good enough

---
 src/player/Human.java | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/player/Human.java b/src/player/Human.java
index 9263c36..84d792e 100644
--- a/src/player/Human.java
+++ b/src/player/Human.java
@@ -1,6 +1,9 @@
 package player;
 
 import java.util.Scanner;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.Arrays;
 
 public class Human implements Player {
 
@@ -17,8 +20,18 @@ public class Human implements Player {
 
     @Override
     public int move(int[][] board) {
-        System.out.print("Choose a move: ");
-        return sc.nextInt();
+        Set<Integer> options = new HashSet<>(Arrays.asList(0,1,2,3,4,5,6));
+        for (Integer i: new HashSet<Integer>(options)) {
+            if (board[i][0] != 0) {
+                options.remove(i);
+            }
+        }
+        int choice = -1;
+        while (!options.contains(new Integer(choice))) {
+            System.out.print("Choose a move from " + options + ": ");
+            choice = sc.nextInt();
+        }
+        return choice;
     }
 
     @Override