From 71342b11dab1ed49e611292849107a6eb9c41a67 Mon Sep 17 00:00:00 2001
From: Pacien TRAN-GIRARD
Date: Sat, 21 Nov 2015 19:14:44 +0100
Subject: Implement Monkey A.I.

---
 src/ch/epfl/maze/physical/zoo/Monkey.java | 35 ++++++++++++++++++++++++++-----
 1 file changed, 30 insertions(+), 5 deletions(-)

(limited to 'src/ch')

diff --git a/src/ch/epfl/maze/physical/zoo/Monkey.java b/src/ch/epfl/maze/physical/zoo/Monkey.java
index f0f9b2e..8aea75d 100644
--- a/src/ch/epfl/maze/physical/zoo/Monkey.java
+++ b/src/ch/epfl/maze/physical/zoo/Monkey.java
@@ -4,12 +4,20 @@ import ch.epfl.maze.physical.Animal;
 import ch.epfl.maze.util.Direction;
 import ch.epfl.maze.util.Vector2D;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
 /**
  * Monkey A.I. that puts its hand on the left wall and follows it.
+ *
+ * @author Pacien TRAN-GIRARD
  */
 
 public class Monkey extends Animal {
 
+    private Direction currentDirection;
+
     /**
      * Constructs a monkey with a starting position.
      *
@@ -18,7 +26,25 @@ public class Monkey extends Animal {
 
     public Monkey(Vector2D position) {
         super(position);
-        // TODO
+        this.currentDirection = Direction.NONE;
+    }
+
+    /**
+     * Finds a currentDirection following the "left paw rule".
+     *
+     * @param choices An array of possible directions
+     * @return The currentDirection to take according to the "left paw rule"
+     */
+
+    private Direction followLeft(Direction[] choices) {
+        if (choices.length == 0) return Direction.NONE;
+        if (choices.length == 1) return choices[0];
+
+        List<Direction> choiceList = new ArrayList<>(Arrays.asList(choices));
+        Direction dir = this.currentDirection.rotateLeft();
+        while (!choiceList.contains(dir)) dir = dir.rotateRight();
+
+        return dir;
     }
 
     /**
@@ -27,13 +53,12 @@ public class Monkey extends Animal {
 
     @Override
     public Direction move(Direction[] choices) {
-        // TODO
-        return Direction.NONE;
+        this.currentDirection = this.followLeft(choices);
+        return this.currentDirection;
     }
 
     @Override
     public Animal copy() {
-        // TODO
-        return null;
+        return new Monkey(this.getPosition());
     }
 }
-- 
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