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packages/engine/src/utils/vessel.ts

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+import { MapTile } from "../types/map";
+import { Port } from "../types/port";
+import { Vessel } from "../types/vessel";
+import { intersect } from "./math";
+
+const getVesselStats = (vessel: Vessel) => {
+  return {
+    visibility: 500,
+    energy: 1,
+    power: 1,
+  };
+};
+
+const getCurrentTile = (vessel: Vessel, map: MapTile[][]) => {
+  const x = Math.max(Math.floor(vessel.position.x), 0);
+  const y = Math.max(Math.floor(vessel.position.y), 0);
+  return map[y][x];
+};
+
+const getVisiblePorts = (vessel: Vessel, map: MapTile[][], ports: Port[]) => {
+  const tiles = map.map((row, x) => row.filter(t => t.type === 'port').map((tile, y) => ({ tile, x, y }))).flat();
+  const stats = getVesselStats(vessel);
+  const visibleTiles = tiles.filter((port) => intersect(vessel.position, stats.visibility, { x: port.x, y: port.y }, 1));
+  const ids = [...new Set(visibleTiles.map(t => t.tile.type === 'port' ? t.tile.id : ''))];
+  return ports.filter(p => ids.includes(p.id));
+};
+
+const getVesselTravelDelta = (vessel: Vessel) => {
+  const stats = getVesselStats(vessel);
+  const speed = stats.power * vessel.power * 0.1;
+
+  const fuel = stats.energy * vessel.power;
+  return {
+    speed,
+    fuel,
+  }
+}
+
+export { getVesselStats, getVesselTravelDelta, getVisiblePorts, getCurrentTile };