Basic world generation for entire Vault dimension

Plugin NPC/src/main/java/net/simon987/npcplugin/VaultDimension.java

@@ -4,7 +4,11 @@ import net.simon987.server.GameServer;
 import net.simon987.server.game.Direction;
 import net.simon987.server.game.World;
 
+import java.awt.*;
 import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Random;
 
 public class VaultDimension {
 
@@ -17,18 +21,153 @@ public class VaultDimension {
 
         name = "v" + vaultDoorId + "-";
 
+        /*
+         * Creates a group of vault worlds and pieces them together with openings.
+         * For a set number of passes, a random number of vault worlds are added to each world in the
+         * previous 'layer' of worlds in a random direction. Openings are added to allow movement from a
+         * layer to the next, meaning that adjacent worlds are not necessarily connected, and one would
+         * necessarily need to travel through 5 openings to reach the 6th layer, even when that layer is
+         * less than 5 worlds away from the origin/home vault world (the one containing the exit door).
+         *
+         * 1. Create home world (layer 0)
+         * 2. For each world in the current layer, attach a random number of new worlds
+         * 3. Repeat the same step for the newly added layer
+         * 4. Choose a random world from the last layer and create the vault box there (objective)
+         *
+         * This process is actually done in 2 passes, in the first pass, worlds are defined
+         * as a set of coordinates + a list of opening directions, then they are actually generated
+         */
+
+        int minLayerCount = 4;
+        int maxLayerCount = 6;
+        int minAttachedWorld = 0;
+        int maxAttachedWorld = 4; //todo cap at 4 to avoid infinite loop
+
+        HashMap<Integer, ArrayList<WorldBluePrint>> worldLayers = new HashMap<>();
         VaultWorldGenerator generator = new VaultWorldGenerator();
+        Random random = new Random();
 
+        int layerCount = random.nextInt(maxLayerCount - minLayerCount) + minLayerCount;
 
-        ArrayList<Direction> openings = new ArrayList<>();
-        openings.add(Direction.WEST);
-        openings.add(Direction.SOUTH);
-        openings.add(Direction.EAST);
-        openings.add(Direction.NORTH);
+        //1. Create home world
+        WorldBluePrint homeWorld = new WorldBluePrint();
+        homeWorld.coords.x = 0x7FFF;
+        homeWorld.coords.y = 0x7FFF;
+        worldLayers.put(0, new ArrayList<>());
+        worldLayers.get(0).add(homeWorld);
 
-        World vWorld = generator.generateVaultWorld(0x7FFF, 0x7FFF, openings, name);
+        //2. For each world in the current layer, attach a random number of new worlds
+        for (int i = 1; i <= layerCount; i++) {
 
-        GameServer.INSTANCE.getGameUniverse().addWorld(vWorld);
+            worldLayers.put(i, new ArrayList<>());
+
+            for (WorldBluePrint world : worldLayers.get(i - 1)) {
+
+                int attachedWorlds;
+                if (i == 1) {
+                    attachedWorlds = 4; // The home world should have 4 attached worlds
+                } else {
+                    attachedWorlds = random.nextInt(maxAttachedWorld - minAttachedWorld) + minAttachedWorld;
+                }
+
+                for (int j = 0; j < attachedWorlds; j++) {
+
+                    int rDirIndex = random.nextInt(4);
+
+                    //Try 4 directions (wrap around 0..3)
+                    for (int attemptCount = 0; attemptCount < 4; attemptCount++) {
+                        Direction rDir = Direction.getDirection(rDirIndex);
+
+                        //Don't attach a world at the same spot twice
+                        if (!worldExists(world.coordinatesOf(rDir), worldLayers)) {
+                            WorldBluePrint attachedWorld = world.attachWorld(rDir);
+                            worldLayers.get(i).add(attachedWorld);
+                        }
+                        rDirIndex = (rDirIndex + 1) % 4;
+                    }
+                }
+            }
+        }
+
+        ArrayList<World> lastLayerWorlds = new ArrayList<>();
+
+        //Generate worlds
+        for (Integer key : worldLayers.keySet()) {
+
+            ArrayList<WorldBluePrint> layer = worldLayers.get(key);
+
+            for (WorldBluePrint bp : layer) {
+                World vWorld = generator.generateVaultWorld(bp.coords.x, bp.coords.y, bp.openings, name);
+                GameServer.INSTANCE.getGameUniverse().addWorld(vWorld);
+
+                if (key == layerCount - 1) {
+                    lastLayerWorlds.add(vWorld);
+                }
+            }
+        }
+
+        //4. Choose a random world from the last layer and create the vault box there (objective)
+        World objectiveWorld = lastLayerWorlds.get(random.nextInt(lastLayerWorlds.size()));
+
+    }
+
+    private boolean worldExists(Point coords, HashMap<Integer, ArrayList<WorldBluePrint>> worldLayers) {
+
+        //Auto-generated by IntelliJ Idea
+        return worldLayers.values().stream().flatMap(Collection::stream).anyMatch(bp -> bp.coords.equals(coords));
+    }
+
+    private class WorldBluePrint {
+
+        public ArrayList<Direction> openings = new ArrayList<>(4);
+
+        public Point coords = new Point();
+
+        /**
+         * Update the blueprint's openings to allow traveling to the newly attached world
+         *
+         * @param direction direction of the world to attach (relative to this one)
+         * @return The blueprint of the attached world
+         */
+        public WorldBluePrint attachWorld(Direction direction) {
+
+            WorldBluePrint attachedWorld = new WorldBluePrint();
+
+            switch (direction) {
+                case NORTH:
+                    openings.add(Direction.NORTH);
+                    attachedWorld.openings.add(Direction.SOUTH);
+                    break;
+                case EAST:
+                    openings.add(Direction.EAST);
+                    attachedWorld.openings.add(Direction.WEST);
+                    break;
+                case SOUTH:
+                    openings.add(Direction.SOUTH);
+                    attachedWorld.openings.add(Direction.NORTH);
+                    break;
+                case WEST:
+                    openings.add(Direction.WEST);
+                    attachedWorld.openings.add(Direction.EAST);
+                    break;
+            }
+
+            attachedWorld.coords.x = coords.x + direction.dX;
+            attachedWorld.coords.y = coords.y + direction.dY;
+
+            return attachedWorld;
+        }
+
+        /**
+         * Get the coordinates of a world that would be attached to this world
+         *
+         * @param direction direction of the attached world
+         */
+        Point coordinatesOf(Direction direction) {
+
+            return new Point(coords.x + direction.dX, coords.y + direction.dY);
+
+        }
     }
 
 }