destroyer spawns from port

src/core/Util.ts

@@ -4,6 +4,7 @@ import DOMPurify from 'dompurify';
 
 
 import { Cell, Game, Player, TerraNullius, Tile } from "./game/Game";
+import { number } from 'zod';
 
 export function manhattanDist(c1: Cell, c2: Cell): number {
     return Math.abs(c1.x - c2.x) + Math.abs(c1.y - c2.y);
@@ -38,6 +39,12 @@ export function dist(root: Tile, dist: number): (tile: Tile) => boolean {
     return (n: Tile) => manhattanDist(root.cell(), n.cell()) <= dist;
 }
 
+export function distSort(target: Tile): (a: Tile, b: Tile) => number {
+    return (a: Tile, b: Tile) => {
+        return manhattanDist(a.cell(), target.cell()) - manhattanDist(b.cell(), target.cell());
+    }
+}
+
 export function and(x: (tile: Tile) => boolean, y: (tile: Tile) => boolean): (tile: Tile) => boolean {
     return (tile: Tile) => x(tile) && y(tile)
 }

src/core/execution/DestroyerExecution.ts

@@ -1,6 +1,6 @@
 import { Cell, Execution, MutableGame, MutablePlayer, MutableUnit, PlayerID, Tile, UnitType } from "../game/Game";
 import { AStar, PathFinder } from "../PathFinding";
-import { manhattanDist } from "../Util";
+import { distSort, manhattanDist } from "../Util";
 
 export class DestroyerExecution implements Execution {
 
@@ -32,7 +32,13 @@ export class DestroyerExecution implements Execution {
     tick(ticks: number): void {
         // TODO: remove gold from player
         if (this.destroyer == null) {
-            this.destroyer = this._owner.addUnit(UnitType.Destroyer, 0, this.mg.tile(this.cell))
+            const spawns = this._owner.units(UnitType.Port).map(u => u.tile()).sort(distSort(this.patrolTile))
+            if (spawns.length == 0) {
+                console.warn(`no ports found for destoryer for player ${this._owner}`)
+                this.active = false
+                return
+            }
+            this.destroyer = this._owner.addUnit(UnitType.Destroyer, 0, spawns[0])
             return
         }
         if (!this.destroyer.isActive()) {