Make the AI more robust

Signed-off-by: Chris Cromer <chris@cromer.cl>

src/main/java/cl/cromer/azaraka/Canvas.java

@@ -318,7 +318,7 @@ public class Canvas extends java.awt.Canvas implements Constants {
 			}
 
 			for (Key key : keys) {
-				player.getAi().addDestination(new State(key.getCell().getX(), key.getCell().getY(), State.Type.KEY, null, 2));
+				player.getAi().addDestination(new State(key.getCell().getX(), key.getCell().getY(), State.Type.KEY, null, 1));
 			}
 
 			player.getAi().sortDestinations();

src/main/java/cl/cromer/azaraka/Scene.java

@@ -60,6 +60,7 @@ public class Scene extends JComponent implements Constants {
 	 * The cells of the game
 	 */
 	private final Cell[][] cells;
+	//private final CopyOnWriteArrayList<CopyOnWriteArrayList<Cell>> cells;
 	/**
 	 * The logger
 	 */

src/main/java/cl/cromer/azaraka/ai/AI.java

@@ -76,6 +76,17 @@ public class AI implements Runnable {
 		throw new AIException("The addDestination method should be run by the child only!");
 	}
 
+	/**
+	 * Remove the picked up key from destinations if it is there
+	 *
+	 * @param x The x coordinate of the key
+	 * @param y The y coordinate of the key
+	 * @throws AIException Thrown when the parent method is called directly
+	 */
+	public void removeKeyDestination(int x, int y) throws AIException {
+		throw new AIException("The addDestination method should be run by the child only!");
+	}
+
 	/**
 	 * Sort the destinations
 	 *

src/main/java/cl/cromer/azaraka/ai/PlayerAI.java

@@ -129,10 +129,14 @@ public interface PlayerAI extends Runnable, Constants {
 					if (player.getAnimation().getCurrentDirection() != Animation.Direction.UP) {
 						player.keyPressed(KeyEvent.VK_UP);
 					}
-					player.interact();
+					boolean portalWasActive = false;
 					Portal portal = scene.getCanvas().getPortal();
 					if (portal.getState() == Portal.State.ACTIVE) {
-						addDestination(new State(portal.getCell().getX(), portal.getCell().getY(), State.Type.PORTAL, null, 2));
+						portalWasActive = true;
+					}
+					player.interact();
+					if (!portalWasActive) {
+						addDestination(new State(portal.getCell().getX(), portal.getCell().getY(), State.Type.PORTAL, null, 1));
 					}
 					sortDestinations();
 					return true;
@@ -213,6 +217,12 @@ public interface PlayerAI extends Runnable, Constants {
 		if (player.getCell().getY() < VERTICAL_CELLS - 1 && scene.getCells()[player.getCell().getX()][player.getCell().getY() + 1].getObject() == null) {
 			openSpaces.add(State.Type.DOWN);
 		}
+
+		if (openSpaces.size() == 0) {
+			// The player can't move
+			return State.Type.EXIT;
+		}
+
 		int random = random(0, openSpaces.size() - 1);
 		return openSpaces.get(random);
 	}

src/main/java/cl/cromer/azaraka/ai/PlayerAStarAI.java

@@ -26,6 +26,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.PriorityQueue;
 import java.util.Queue;
+import java.util.concurrent.CopyOnWriteArrayList;
 
 /**
  * The class implements the A* search AI algorithm for the player
@@ -58,7 +59,7 @@ public class PlayerAStarAI extends AI implements PlayerAI, Constants {
 	/**
 	 * The destinations the player needs to visit
 	 */
-	private List<State> destinations = new ArrayList<>();
+	private List<State> destinations = new CopyOnWriteArrayList<>();
 	/**
 	 * The objective that was found
 	 */
@@ -95,7 +96,7 @@ public class PlayerAStarAI extends AI implements PlayerAI, Constants {
 		cameFrom.put(start, start);
 		costSoFar.put(start, 0.0);
 
-		while (frontier.size() > 0 && cameFrom.size() <= (HORIZONTAL_CELLS * VERTICAL_CELLS) * 2) {
+		while (frontier.size() > 0 && cameFrom.size() <= (HORIZONTAL_CELLS * VERTICAL_CELLS) * 5) {
 			State current = frontier.poll();
 
 			if (current.equals(goal)) {
@@ -200,52 +201,155 @@ public class PlayerAStarAI extends AI implements PlayerAI, Constants {
 	private double getCost(State state) {
 		// The cost increases based on how close the enemy is
 		/*
-			  2
-			 444
+			22222
+			24442
 			24842
-			 444
-			  2
+			24442
+			22222
 		 */
-		if (state.getOperation() == State.Type.ENEMY) {
-			return 8;
+
+		EnemyCost enemyCost = EnemyCost.DIRECT_CORNERS;
+
+		if (enemyCost.getLevel() == EnemyCost.NONE.getLevel()) {
+			return EnemyCost.NONE.getCost();
 		}
-		else if (state.getX() > 0 && scene.getCells()[state.getX() - 1][state.getY()].getObject() instanceof Enemy) {
-			return 4;
+
+		if (enemyCost.getLevel() >= EnemyCost.DIRECT.getLevel()) {
+			// The enemy
+			if (scene.getCells()[state.getX()][state.getY()].getObject() instanceof Enemy) {
+				return EnemyCost.DIRECT.getCost();
+			}
 		}
-		else if (state.getX() < HORIZONTAL_CELLS - 1 && scene.getCells()[state.getX() + 1][state.getY()].getObject() instanceof Enemy) {
-			return 4;
+
+		if (enemyCost.getLevel() >= EnemyCost.DIRECT_SIDES.getLevel()) {
+			// Left
+			if (state.getX() > 0 && scene.getCells()[state.getX() - 1][state.getY()].getObject() instanceof Enemy) {
+				return EnemyCost.DIRECT_SIDES.getCost();
+			}
+
+			// Right
+			else if (state.getX() < HORIZONTAL_CELLS - 1 && scene.getCells()[state.getX() + 1][state.getY()].getObject() instanceof Enemy) {
+				return EnemyCost.DIRECT_SIDES.getCost();
+			}
+
+			// Up
+			else if (state.getY() > 0 && scene.getCells()[state.getX()][state.getY() - 1].getObject() instanceof Enemy) {
+				return EnemyCost.DIRECT_SIDES.getCost();
+			}
+
+			// Down
+			else if (state.getY() < VERTICAL_CELLS - 1 && scene.getCells()[state.getX()][state.getY() + 1].getObject() instanceof Enemy) {
+				return EnemyCost.DIRECT_SIDES.getCost();
+			}
 		}
-		else if (state.getY() > 0 && scene.getCells()[state.getX()][state.getY() - 1].getObject() instanceof Enemy) {
-			return 4;
+
+		if (enemyCost.getLevel() >= EnemyCost.DIRECT_CORNERS.getLevel()) {
+			// Upper left corner
+			if (state.getX() > 0 && state.getY() > 0 && scene.getCells()[state.getX() - 1][state.getY() - 1].getObject() instanceof Enemy) {
+				return EnemyCost.DIRECT_CORNERS.getCost();
+			}
+
+			// Upper right corner
+			else if (state.getX() < HORIZONTAL_CELLS - 1 && state.getY() > 0 && scene.getCells()[state.getX() + 1][state.getY() - 1].getObject() instanceof Enemy) {
+				return EnemyCost.DIRECT_CORNERS.getCost();
+			}
+
+			// Lower left corner
+			else if (state.getX() > 0 && state.getY() < VERTICAL_CELLS - 1 && scene.getCells()[state.getX() - 1][state.getY() + 1].getObject() instanceof Enemy) {
+				return EnemyCost.DIRECT_CORNERS.getCost();
+			}
+
+			// Lower right corner
+			else if (state.getX() < HORIZONTAL_CELLS - 1 && state.getY() < VERTICAL_CELLS - 1 && scene.getCells()[state.getX() + 1][state.getY() + 1].getObject() instanceof Enemy) {
+				return EnemyCost.DIRECT_CORNERS.getCost();
+			}
 		}
-		else if (state.getY() < VERTICAL_CELLS - 1 && scene.getCells()[state.getX()][state.getY() + 1].getObject() instanceof Enemy) {
-			return 4;
+
+		if (enemyCost.getLevel() >= EnemyCost.FAR_SIDES.getLevel()) {
+			// Left
+			if (state.getX() > 1 && scene.getCells()[state.getX() - 2][state.getY()].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_SIDES.getCost();
+			}
+
+			// Right
+			else if (state.getX() < HORIZONTAL_CELLS - 2 && scene.getCells()[state.getX() + 2][state.getY()].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_SIDES.getCost();
+			}
+
+			// Up
+			else if (state.getY() > 1 && scene.getCells()[state.getX()][state.getY() - 2].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_SIDES.getCost();
+			}
+
+			// Down
+			else if (state.getY() < VERTICAL_CELLS - 2 && scene.getCells()[state.getX()][state.getY() + 2].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_SIDES.getCost();
+			}
 		}
-		else if (state.getX() > 1 && scene.getCells()[state.getX() - 2][state.getY()].getObject() instanceof Enemy) {
-			return 2;
+
+		if (enemyCost.getLevel() >= EnemyCost.FAR_CORNERS.getLevel()) {
+			// Upper left corner
+			if (state.getX() > 1 && state.getY() > 0 && scene.getCells()[state.getX() - 2][state.getY() - 1].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_CORNERS.getCost();
+			}
+			else if (state.getX() > 1 && state.getY() > 1 && scene.getCells()[state.getX() - 2][state.getY() - 2].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_CORNERS.getCost();
+			}
+			else if (state.getX() > 0 && state.getY() > 1 && scene.getCells()[state.getX() - 1][state.getY() - 2].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_CORNERS.getCost();
+			}
+
+			// Upper right corner
+			else if (state.getX() < HORIZONTAL_CELLS - 2 && state.getY() > 0 && scene.getCells()[state.getX() + 2][state.getY() - 1].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_CORNERS.getCost();
+			}
+			else if (state.getX() < HORIZONTAL_CELLS - 2 && state.getY() > 1 && scene.getCells()[state.getX() + 2][state.getY() - 2].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_CORNERS.getCost();
+			}
+			else if (state.getX() < HORIZONTAL_CELLS - 1 && state.getY() > 1 && scene.getCells()[state.getX() + 1][state.getY() - 2].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_CORNERS.getCost();
+			}
+
+			// Lower left corner
+			else if (state.getX() > 1 && state.getY() < VERTICAL_CELLS - 1 && scene.getCells()[state.getX() - 2][state.getY() + 1].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_CORNERS.getCost();
+			}
+			else if (state.getX() > 1 && state.getY() < VERTICAL_CELLS - 2 && scene.getCells()[state.getX() - 2][state.getY() + 2].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_CORNERS.getCost();
+			}
+			else if (state.getX() > 0 && state.getY() < VERTICAL_CELLS - 2 && scene.getCells()[state.getX() - 1][state.getY() + 2].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_CORNERS.getCost();
+			}
+
+			// Lower right corner
+			else if (state.getX() < HORIZONTAL_CELLS - 2 && state.getY() < VERTICAL_CELLS - 1 && scene.getCells()[state.getX() + 2][state.getY() + 1].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_CORNERS.getCost();
+			}
+			else if (state.getX() < HORIZONTAL_CELLS - 2 && state.getY() < VERTICAL_CELLS - 2 && scene.getCells()[state.getX() + 2][state.getY() + 2].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_CORNERS.getCost();
+			}
+			else if (state.getX() < HORIZONTAL_CELLS - 1 && state.getY() < VERTICAL_CELLS - 2 && scene.getCells()[state.getX() + 1][state.getY() + 2].getObject() instanceof Enemy) {
+				return EnemyCost.FAR_CORNERS.getCost();
+			}
 		}
-		else if (state.getX() < HORIZONTAL_CELLS - 2 && scene.getCells()[state.getX() + 2][state.getY()].getObject() instanceof Enemy) {
-			return 2;
+
+		return EnemyCost.NONE.getCost();
+	}
+
+	/**
+	 * Remove the picked up key from destinations if it is there
+	 *
+	 * @param x The x coordinate of the key
+	 * @param y The y coordinate of the key
+	 */
+	public void removeKeyDestination(int x, int y) {
+		for (State state : destinations) {
+			if (state.getOperation() == State.Type.KEY && state.getX() == x && state.getY() == y) {
+				destinations.remove(state);
+				sortDestinations();
+				break;
+			}
 		}
-		else if (state.getY() > 1 && scene.getCells()[state.getX()][state.getY() - 2].getObject() instanceof Enemy) {
-			return 2;
-		}
-		else if (state.getY() < VERTICAL_CELLS - 2 && scene.getCells()[state.getX()][state.getY() + 2].getObject() instanceof Enemy) {
-			return 2;
-		}
-		else if (state.getX() > 0 && state.getY() > 0 && scene.getCells()[state.getX() - 1][state.getY() - 1].getObject() instanceof Enemy) {
-			return 4;
-		}
-		else if (state.getX() < HORIZONTAL_CELLS - 1 && state.getY() > 0 && scene.getCells()[state.getX() + 1][state.getY() - 1].getObject() instanceof Enemy) {
-			return 4;
-		}
-		else if (state.getX() > 0 && state.getY() < VERTICAL_CELLS - 1 && scene.getCells()[state.getX() - 1][state.getY() + 1].getObject() instanceof Enemy) {
-			return 4;
-		}
-		else if (state.getX() < HORIZONTAL_CELLS - 1 && state.getY() < VERTICAL_CELLS - 1 && scene.getCells()[state.getX() + 1][state.getY() + 1].getObject() instanceof Enemy) {
-			return 4;
-		}
-		return 1;
 	}
 
 	/**
@@ -257,37 +361,6 @@ public class PlayerAStarAI extends AI implements PlayerAI, Constants {
 		destinations.add(destination);
 	}
 
-	/**
-	 * Calculate the route from the objective to the player
-	 */
-	private void calculateRoute() {
-		getLogger().info("Calculate the route!");
-		State predecessor = foundObjective;
-		do {
-			steps.add(0, predecessor.getOperation());
-			predecessor = predecessor.getPredecessor();
-		}
-		while (predecessor != null);
-	}
-
-	/**
-	 * Sort the destinations by importance, if the importance is the same then sort them by distance
-	 */
-	@Override
-	public void sortDestinations() {
-		destinations = sortDestinations(destinations, initial);
-	}
-
-	/**
-	 * Clear the states to be ready for a new search
-	 */
-	private void clearStates() {
-		frontier.clear();
-		cameFrom.clear();
-		costSoFar.clear();
-		steps.clear();
-	}
-
 	/**
 	 * Run this in a loop
 	 */
@@ -334,11 +407,14 @@ public class PlayerAStarAI extends AI implements PlayerAI, Constants {
 				}
 				destinationIndex++;
 				if (destinationIndex >= destinations.size()) {
-					destinationIndex = 0;
+					getLogger().info("None of the destinations are reachable for A* Search!");
 					// No destinations are reachable, make the player move around at random to help move the enemies
-					if (steps.size() > 0) {
-						steps.add(1, getOpenSpaceAroundPlayer(scene));
+					if (steps.size() == 0) {
+						steps.add(0, State.Type.PLAYER);
 					}
+					steps.add(1, getOpenSpaceAroundPlayer(scene));
+					found = true;
+					break;
 				}
 			}
 			while (!found && !destinations.isEmpty());
@@ -348,4 +424,103 @@ public class PlayerAStarAI extends AI implements PlayerAI, Constants {
 			}
 		}
 	}
+
+	/**
+	 * Calculate the route from the objective to the player
+	 */
+	private void calculateRoute() {
+		getLogger().info("Calculate the route!");
+		State predecessor = foundObjective;
+		do {
+			steps.add(0, predecessor.getOperation());
+			predecessor = predecessor.getPredecessor();
+		}
+		while (predecessor != null);
+	}
+
+	/**
+	 * Sort the destinations by importance, if the importance is the same then sort them by distance
+	 */
+	@Override
+	public void sortDestinations() {
+		destinations = sortDestinations(destinations, initial);
+	}
+
+	/**
+	 * Clear the states to be ready for a new search
+	 */
+	private void clearStates() {
+		frontier.clear();
+		cameFrom.clear();
+		costSoFar.clear();
+		steps.clear();
+	}
+
+	/**
+	 * The cost based on enemy position
+	 */
+	private enum EnemyCost {
+		/**
+		 * The enemy does not have a cost
+		 */
+		NONE(0, 1),
+		/**
+		 * The enemy cell has a cost
+		 */
+		DIRECT(1, 8),
+		/**
+		 * The cells to the side of the enemy have a cost
+		 */
+		DIRECT_SIDES(2, 4),
+		/**
+		 * The cells on the corner of the enemy
+		 */
+		DIRECT_CORNERS(3, 4),
+		/**
+		 * The cells father to the side of the enemy
+		 */
+		FAR_SIDES(4, 2),
+		/**
+		 * The cells in the corner farthest from the enemy
+		 */
+		FAR_CORNERS(5, 2);
+
+		/**
+		 * The level of cost to use for the enemy
+		 */
+		private final int level;
+		/**
+		 * The cost value to use
+		 */
+		private final int cost;
+
+		/**
+		 * Initialize the enemy cost and level
+		 *
+		 * @param level The level
+		 * @param cost The cost
+		 */
+		EnemyCost(int level, int cost) {
+			this.level = level;
+			this.cost = cost;
+		}
+
+		/**
+		 * Get the cost level of the enemy
+		 *
+		 * @return Returns the cost level
+		 */
+		protected int getLevel() {
+			return this.level;
+		}
+
+		/**
+		 * Get the cost of the enemy
+		 *
+		 * @return Returns the cost
+		 */
+		protected int getCost() {
+			return this.cost;
+		}
+	}
 }

src/main/java/cl/cromer/azaraka/ai/PlayerBreadthFirstAI.java

@@ -23,6 +23,7 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.PriorityQueue;
 import java.util.Queue;
+import java.util.concurrent.CopyOnWriteArrayList;
 
 /**
  * This is an implementation of the Breadth-First search algorithm with multiple objectives
@@ -59,7 +60,7 @@ public class PlayerBreadthFirstAI extends AI implements PlayerAI, Constants {
 	/**
 	 * The destinations to visit
 	 */
-	private List<State> destinations = new ArrayList<>();
+	private List<State> destinations = new CopyOnWriteArrayList<>();
 	/**
 	 * The initial point to start searching from
 	 */
@@ -220,6 +221,22 @@ public class PlayerBreadthFirstAI extends AI implements PlayerAI, Constants {
 		destinations.add(destination);
 	}
 
+	/**
+	 * Remove the picked up key from destinations if it is there
+	 *
+	 * @param x The x coordinate of the key
+	 * @param y The y coordinate of the key
+	 */
+	public void removeKeyDestination(int x, int y) {
+		for (State state : destinations) {
+			if (state.getOperation() == State.Type.KEY && state.getX() == x && state.getY() == y) {
+				destinations.remove(state);
+				sortDestinations();
+				break;
+			}
+		}
+	}
+
 	/**
 	 * Sort the destinations by importance, if the importance is the same then sort them by distance
 	 */
@@ -284,10 +301,14 @@ public class PlayerBreadthFirstAI extends AI implements PlayerAI, Constants {
 					}
 					destinationIndex++;
 					if (destinationIndex >= destinations.size()) {
-						destinationIndex = 0;
-						if (steps.size() > 0) {
-							steps.add(1, getOpenSpaceAroundPlayer(scene));
+						getLogger().info("None of the destinations are reachable for Breadth-First Search!");
+						// No destinations are reachable, make the player move around at random to help move the enemies
+						if (steps.size() == 0) {
+							steps.add(0, State.Type.PLAYER);
 						}
+						steps.add(1, getOpenSpaceAroundPlayer(scene));
+						found = true;
+						break;
 					}
 				}
 				while (!found && !destinations.isEmpty());

src/main/java/cl/cromer/azaraka/object/Key.java

@@ -18,6 +18,7 @@ package cl.cromer.azaraka.object;
 import cl.cromer.azaraka.Cell;
 import cl.cromer.azaraka.Constants;
 import cl.cromer.azaraka.Scene;
+import cl.cromer.azaraka.ai.AIException;
 import cl.cromer.azaraka.sound.Sound;
 import cl.cromer.azaraka.sound.SoundException;
 import cl.cromer.azaraka.sprite.Animation;
@@ -116,6 +117,12 @@ public class Key extends Object implements Constants {
 		// Remove the key from the cell
 		getCell().setObjectOnBottom(null);
 		setState(State.HELD);
+		try {
+			getScene().getCanvas().getPlayer().getAi().removeKeyDestination(getCell().getX(), getCell().getY());
+		}
+		catch (AIException e) {
+			getLogger().warning(e.getMessage());
+		}
 	}
 
 	/**