From 3f5c3d91a084233cfc77635697b3c537adbced74 Mon Sep 17 00:00:00 2001
From: Pacien TRAN-GIRARD
Date: Tue, 24 Nov 2015 16:33:34 +0100
Subject: Refactor Monkey A.I.

---
 .../physical/stragegies/picker/CyclePicker.java    | 41 ++++++++++++++++++++
 .../physical/stragegies/picker/SimplePicker.java   | 21 +++++++++++
 src/ch/epfl/maze/physical/zoo/Monkey.java          | 44 +++++++++++-----------
 3 files changed, 83 insertions(+), 23 deletions(-)
 create mode 100644 src/ch/epfl/maze/physical/stragegies/picker/CyclePicker.java
 create mode 100644 src/ch/epfl/maze/physical/stragegies/picker/SimplePicker.java

(limited to 'src/ch/epfl/maze/physical')

diff --git a/src/ch/epfl/maze/physical/stragegies/picker/CyclePicker.java b/src/ch/epfl/maze/physical/stragegies/picker/CyclePicker.java
new file mode 100644
index 0000000..e1a969f
--- /dev/null
+++ b/src/ch/epfl/maze/physical/stragegies/picker/CyclePicker.java
@@ -0,0 +1,41 @@
+package ch.epfl.maze.physical.stragegies.picker;
+
+import ch.epfl.maze.util.Direction;
+
+import java.util.Set;
+
+/**
+ * A decision maker cycling in each Direction starting from a given one.
+ *
+ * @author Pacien TRAN-GIRARD
+ */
+public interface CyclePicker extends BlindPicker {
+
+    /**
+     * Returns the cycle starting Direction.
+     *
+     * @return The starting Direction
+     */
+    Direction getStartingDirection();
+
+    /**
+     * Returns the Rotation Direction.
+     *
+     * @return The Rotation Direction
+     */
+    Direction getRotationDirection();
+
+    @Override
+    default Direction pick(Set<Direction> choices) {
+        if (choices.isEmpty()) return FALLBACK_DIRECTION;
+        if (this.getStartingDirection() == Direction.NONE) return FALLBACK_DIRECTION;
+        if (this.getRotationDirection() == Direction.NONE) return FALLBACK_DIRECTION;
+
+        Direction dir = this.getStartingDirection();
+        while (!choices.contains(dir))
+            dir = dir.unRelativeDirection(this.getRotationDirection());
+
+        return dir;
+    }
+
+}
diff --git a/src/ch/epfl/maze/physical/stragegies/picker/SimplePicker.java b/src/ch/epfl/maze/physical/stragegies/picker/SimplePicker.java
new file mode 100644
index 0000000..71f0802
--- /dev/null
+++ b/src/ch/epfl/maze/physical/stragegies/picker/SimplePicker.java
@@ -0,0 +1,21 @@
+package ch.epfl.maze.physical.stragegies.picker;
+
+import ch.epfl.maze.util.Direction;
+
+import java.util.Set;
+
+/**
+ * A simple decision maker with no guarantee of randomness.
+ *
+ * @author Pacien TRAN-GIRARD
+ */
+public interface SimplePicker extends BlindPicker {
+
+    @Override
+    default Direction pick(Set<Direction> choices) {
+        if (choices.isEmpty()) return FALLBACK_DIRECTION;
+
+        return choices.stream().findFirst().get();
+    }
+
+}
diff --git a/src/ch/epfl/maze/physical/zoo/Monkey.java b/src/ch/epfl/maze/physical/zoo/Monkey.java
index 23eec4e..3c84f59 100644
--- a/src/ch/epfl/maze/physical/zoo/Monkey.java
+++ b/src/ch/epfl/maze/physical/zoo/Monkey.java
@@ -1,6 +1,8 @@
 package ch.epfl.maze.physical.zoo;
 
 import ch.epfl.maze.physical.Animal;
+import ch.epfl.maze.physical.stragegies.picker.CyclePicker;
+import ch.epfl.maze.physical.stragegies.picker.SimplePicker;
 import ch.epfl.maze.util.Direction;
 import ch.epfl.maze.util.Vector2D;
 
@@ -12,9 +14,9 @@ import java.util.Set;
  * @author EPFL
  * @author Pacien TRAN-GIRARD
  */
-public class Monkey extends Animal {
+public class Monkey extends Animal implements SimplePicker, CyclePicker {
 
-    private Direction currentDirection;
+    public static final Direction SMART_PAW = Direction.LEFT;
 
     /**
      * Constructs a monkey with a starting position.
@@ -23,33 +25,30 @@ public class Monkey extends Animal {
      */
     public Monkey(Vector2D position) {
         super(position);
-        this.currentDirection = Direction.NONE;
     }
 
-    /**
-     * Finds a currentDirection following the "left paw rule".
-     *
-     * @param choices A set of possible directions
-     * @return The currentDirection to take according to the "left paw rule"
-     */
-    private Direction followLeft(Set<Direction> choices) {
-        Direction dir = this.currentDirection.rotateLeft();
-        while (!choices.contains(dir)) dir = dir.rotateRight();
+    @Override
+    public Direction getStartingDirection() {
+        return this.getDirection().unRelativeDirection(Monkey.SMART_PAW);
+    }
 
-        return dir;
+    @Override
+    public Direction getRotationDirection() {
+        return Monkey.SMART_PAW.reverse();
     }
 
     /**
-     * Determines the strategy to follow depending on special cases.
+     * Picks a Direction following the "paw rule", or any available if the Monkey has no current Direction.
      *
-     * @param choices A set of possible directions
-     * @return The Direction to take
+     * @param choices A set of Direction choices
+     * @return The picked Direction
      */
-    private Direction findDirection(Set<Direction> choices) {
-        if (choices.isEmpty()) return Direction.NONE;
-        if (this.currentDirection == Direction.NONE) return choices.stream().findAny().get();
-        if (choices.size() == 1) return choices.stream().findAny().get();
-        return this.followLeft(choices);
+    @Override
+    public Direction pick(Set<Direction> choices) {
+        if (this.getDirection() == Direction.NONE)
+            return SimplePicker.super.pick(choices);
+        else
+            return CyclePicker.super.pick(choices);
     }
 
     /**
@@ -57,8 +56,7 @@ public class Monkey extends Animal {
      */
     @Override
     public Direction move(Set<Direction> choices) {
-        this.currentDirection = this.findDirection(choices);
-        return this.currentDirection;
+        return this.pick(choices);
     }
 
     @Override
-- 
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