import { describe, expect, it } from "vitest";
import { haversineDistanceNm, initialBearingDeg, normalizeHeadingDeg } from "../src/index.js";

describe("geo helpers", () => {
  it("calculates a practical nautical-mile distance", () => {
    const distance = haversineDistanceNm(
      { lat: 53.541, lon: 9.966 },
      { lat: 54.18, lon: 12.09 }
    );

    expect(distance).toBeGreaterThan(80);
    expect(distance).toBeLessThan(95);
  });

  it("normalizes headings and bearings", () => {
    expect(normalizeHeadingDeg(-10)).toBe(350);
    expect(normalizeHeadingDeg(370)).toBe(10);
    expect(initialBearingDeg({ lat: 53.5, lon: 9.9 }, { lat: 54, lon: 10.1 })).toBeGreaterThan(0);
  });
});