import { describe, it, expect } from "vitest";
import { validateGpx, GpxValidationError } from "./gpx-save.server.ts";

const VALID_GPX = `<?xml version="1.0" encoding="UTF-8"?>
<gpx version="1.1" xmlns="http://www.topografix.com/GPX/1/1">
  <trk>
    <trkseg>
      <trkpt lat="47.0" lon="8.0"><ele>500</ele></trkpt>
      <trkpt lat="47.1" lon="8.1"><ele>520</ele></trkpt>
      <trkpt lat="47.2" lon="8.2"><ele>510</ele></trkpt>
    </trkseg>
  </trk>
</gpx>`;

const ONE_POINT_GPX = `<?xml version="1.0" encoding="UTF-8"?>
<gpx version="1.1" xmlns="http://www.topografix.com/GPX/1/1">
  <trk>
    <trkseg>
      <trkpt lat="47.0" lon="8.0"><ele>500</ele></trkpt>
    </trkseg>
  </trk>
</gpx>`;

const EMPTY_GPX = `<?xml version="1.0" encoding="UTF-8"?>
<gpx version="1.1" xmlns="http://www.topografix.com/GPX/1/1">
  <trk><trkseg></trkseg></trk>
</gpx>`;

const OUT_OF_RANGE_LAT_GPX = `<?xml version="1.0" encoding="UTF-8"?>
<gpx version="1.1" xmlns="http://www.topografix.com/GPX/1/1">
  <trk>
    <trkseg>
      <trkpt lat="91.0" lon="8.0"></trkpt>
      <trkpt lat="47.0" lon="8.0"></trkpt>
    </trkseg>
  </trk>
</gpx>`;

const OUT_OF_RANGE_LON_GPX = `<?xml version="1.0" encoding="UTF-8"?>
<gpx version="1.1" xmlns="http://www.topografix.com/GPX/1/1">
  <trk>
    <trkseg>
      <trkpt lat="47.0" lon="181.0"></trkpt>
      <trkpt lat="47.1" lon="8.0"></trkpt>
    </trkseg>
  </trk>
</gpx>`;

describe("validateGpx", () => {
  it("returns parsed GpxData for valid GPX", async () => {
    const result = await validateGpx(VALID_GPX);
    expect(result.tracks.flat().length).toBe(3);
    expect(result.tracks[0]![0]!.lat).toBeCloseTo(47.0);
  });

  it("throws GpxValidationError for GPX with fewer than 2 track points", async () => {
    await expect(validateGpx(ONE_POINT_GPX)).rejects.toThrow(GpxValidationError);
    await expect(validateGpx(ONE_POINT_GPX)).rejects.toThrow("at least 2 track points");
  });

  it("throws GpxValidationError for GPX with zero track points", async () => {
    await expect(validateGpx(EMPTY_GPX)).rejects.toThrow(GpxValidationError);
    await expect(validateGpx(EMPTY_GPX)).rejects.toThrow("at least 2 track points");
  });

  it("throws GpxValidationError for out-of-range latitude", async () => {
    await expect(validateGpx(OUT_OF_RANGE_LAT_GPX)).rejects.toThrow(GpxValidationError);
    await expect(validateGpx(OUT_OF_RANGE_LAT_GPX)).rejects.toThrow("out-of-range coordinates");
  });

  it("throws GpxValidationError for out-of-range longitude", async () => {
    await expect(validateGpx(OUT_OF_RANGE_LON_GPX)).rejects.toThrow(GpxValidationError);
    await expect(validateGpx(OUT_OF_RANGE_LON_GPX)).rejects.toThrow("out-of-range coordinates");
  });

  it("throws GpxValidationError for unparseable XML", async () => {
    await expect(validateGpx("not xml at all")).rejects.toThrow(GpxValidationError);
    await expect(validateGpx("<broken<xml")).rejects.toThrow(GpxValidationError);
  });

  it("GpxValidationError has the correct name", async () => {
    const err = await validateGpx(EMPTY_GPX).catch((e) => e);
    expect(err).toBeInstanceOf(GpxValidationError);
    expect(err.name).toBe("GpxValidationError");
  });
});