From aa317f43ad2c714cecbae5202bcfc2c2ab68172e Mon Sep 17 00:00:00 2001
From: Pacien TRAN-GIRARD
Date: Tue, 15 Mar 2016 22:56:27 +0100
Subject: Implement conflict resolution protocol

---
 src/ch/epfl/xblast/server/GameState.java | 43 +++++++++++++++++++++++++++++---
 1 file changed, 39 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/ch/epfl/xblast/server/GameState.java b/src/ch/epfl/xblast/server/GameState.java
index e15f0bf..6e7f8c4 100644
--- a/src/ch/epfl/xblast/server/GameState.java
+++ b/src/ch/epfl/xblast/server/GameState.java
@@ -1,10 +1,7 @@
 package ch.epfl.xblast.server;
 
 import ch.epfl.cs108.Sq;
-import ch.epfl.xblast.ArgumentChecker;
-import ch.epfl.xblast.Cell;
-import ch.epfl.xblast.Direction;
-import ch.epfl.xblast.PlayerID;
+import ch.epfl.xblast.*;
 
 import java.util.*;
 import java.util.function.Function;
@@ -19,6 +16,20 @@ import java.util.stream.Stream;
  */
 public final class GameState {
 
+    /**
+     * The list of player priority order permutations.
+     */
+    private static final List<List<PlayerID>> PLAYER_PRIORITY_ORDERS = GameState.buildPlayerPriorityOrderList();
+
+    /**
+     * Builds and returns the player priority order permutations.
+     *
+     * @return the list of player priority orders
+     */
+    private static List<List<PlayerID>> buildPlayerPriorityOrderList() {
+        return Lists.permutations(Arrays.asList(PlayerID.values()));
+    }
+
     /**
      * Filters the given list of players and returns the lively ones.
      *
@@ -261,4 +272,28 @@ public final class GameState {
         return null; // TODO
     }
 
+    /**
+     * Returns the current player priority order permutation.
+     *
+     * @return the player priority order
+     */
+    private List<PlayerID> currentPlayerPriorityOrder() {
+        int priorityIndex = this.ticks % GameState.PLAYER_PRIORITY_ORDERS.size();
+        return GameState.PLAYER_PRIORITY_ORDERS.get(priorityIndex);
+    }
+
+    /**
+     * Resolves a conflict according to the current priority order.
+     *
+     * @param claimants the list of claimants
+     * @return the highest priority player
+     */
+    private PlayerID resolveConflict(List<PlayerID> claimants) {
+        return this.currentPlayerPriorityOrder()
+                .stream()
+                .filter(claimants::contains)
+                .findFirst()
+                .get();
+    }
+
 }
-- 
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