Tail chase chicken

src/lib/Pather.ts

@@ -1,6 +1,7 @@
 import { weight, BLOCKED_THRESHOLD } from './weight';
-import { BTData } from '../types/BTData';
+import { BTData, BTXY } from '../types/BTData';
 import { MoveDirection } from '../types/MoveDirection';
+import { number } from 'mathjs';
 
 const PF = require('pathfinding');
 
@@ -12,6 +13,10 @@ const pf = new PF.AStarFinder({
 const BLOCKED = 1;
 const FREE = 0;
 
+export interface Path extends Array<[number, number]> {
+
+}
+
 export class Pather {
     private pfGrid;
 
@@ -33,7 +38,7 @@ export class Pather {
         this.pfGrid = new PF.Grid(data.board.width, data.board.height, matrix, costs);
     }
 
-    pathTo(x: number, y: number) {
+    pathTo(x: number, y: number): Path {
         return pf.findPath(this.data.you.body[0].x, this.data.you.body[0].y, x, y, this.pfGrid.clone());
     }
 

src/lib/closestEnemyHead.ts

@@ -0,0 +1,36 @@
+import { BTData, BTSnake } from '../types/BTData';
+import { Pather, Path } from './Pather';
+import { isEnemy } from './isEnemy';
+import { MoveDirection } from '../types/MoveDirection';
+
+interface ClosestEnemyHead {
+    snake: BTSnake,
+    path: Path,
+    direction: MoveDirection,
+}
+
+export function closestEnemyHead(data: BTData): ClosestEnemyHead | null {
+    const pather = new Pather(data, false);
+    const closest: ClosestEnemyHead = {
+        snake: null,
+        path: null,
+        direction: null,
+    };
+    for (const snake of data.board.snakes) {
+        if (!isEnemy(data.you, snake)) {
+            continue;
+        }
+        if (data.you.body.length > snake.body.length) {
+            continue;
+        }
+        const path = pather.pathTo(snake.body[0].x, snake.body[0].y);
+        if (path.length) {
+            if (!closest.path || path.length < closest.path.length) {
+                closest.snake = snake;
+                closest.path = path;
+                closest.direction = pather.pathToDirection(closest.path);
+            }
+        }
+    }
+    return closest.snake ? closest : null;
+}

src/lib/moveTowardsEnemy.ts

@@ -1,35 +1,12 @@
 import { log } from './log';
 import { BTData } from '../types/BTData';
-import { Pather } from './Pather';
-import { isEnemy } from './isEnemy';
+import { closestEnemyHead } from './closestEnemyHead';
 
 export function moveTowardsEnemy(data: BTData) {
-    const pather = new Pather(data, false);
-    const closest = {
-        snake: null,
-        path: null,
-    };
-    for (const snake of data.board.snakes) {
-        if (!isEnemy(data.you, snake)) {
-            continue;
-        }
-        if (snake.body.length >= data.you.body.length) {
-            continue;
-        }
-        const path = pather.pathTo(snake.body[0].x, snake.body[0].y);
-        if (path.length) {
-            if (!closest.path || path.length < closest.path.length) {
-                closest.snake = snake;
-                closest.path = path;
-            }
-        }
-    }
-    if (closest.path) {
-        const direction = pather.pathToDirection(closest.path);
-        if (direction) {
-            log('moveTowardsEnemy', direction);
-            return direction;
-        }
+    const closest = closestEnemyHead(data);
+    if (closest.direction) {
+        log('moveTowardsEnemy', closest.direction);
+        return closest.direction;
     }
     log('moveTowardsEnemy', 'no options');
 }

src/server/snakes/tail-chase.ts

@@ -10,6 +10,7 @@ import { moveTowardsTail } from '../../lib/moveTowardsTail';
 import { moveAway } from '../../lib/moveAway';
 import { BaseSnake } from './base-snake';
 import { ISnake } from './snake-interface';
+import { closestEnemyHead } from '../../lib/closestEnemyHead';
 
 export class TailChase extends BaseSnake implements ISnake {
     public port: number = 9005;
@@ -23,6 +24,12 @@ export class TailChase extends BaseSnake implements ISnake {
         if (data.you.health < data.board.width || data.you.health < data.board.height) {
             direction = moveTowardsFoodPf(data);
         }
+
+        const closest = closestEnemyHead(data);
+        console.log(closest);
+        if (closest && closest.path.length <= 3) {
+            direction = moveAway(data);
+        }
         if (!direction) {
             direction = moveTowardsTail(data);
         }