import assert from "node:assert/strict";
import test from "node:test";

import {
  advanceGhostPins,
  destinationPoint,
  geodesicDistanceMeters,
} from "../dist/ghostPins.js";

test("destinationPoint advances a pin over the globe", () => {
  const origin = { longitude: 37.618423, latitude: 55.751244 };
  const destination = destinationPoint(origin, 90, 1_000);
  assert.ok(destination.longitude > origin.longitude);
  assert.ok(Math.abs(destination.latitude - origin.latitude) < 0.001);
  assert.ok(Math.abs(geodesicDistanceMeters(origin, destination) - 1_000) < 0.01);
});

test("advanceGhostPins turns an escaping pin back toward its anchor", () => {
  const anchor = { longitude: 37.618423, latitude: 55.751244 };
  const edge = destinationPoint(anchor, 90, 990);
  const [advanced] = advanceGhostPins([
    {
      id: "ghost-1",
      label: "123456",
      ...edge,
      heading_degrees: 90,
      speed_meters_per_second: 20,
    },
  ], anchor, 1_000, 1);
  assert.ok(geodesicDistanceMeters(anchor, advanced) < 990);
  assert.ok(advanced.heading_degrees > 260 && advanced.heading_degrees < 280);
});