import { describe, expect, it } from "vitest";
import {
  analyseCollection,
  haversine,
  simplifyLine,
  toDms,
} from "../../src/geo/analysis";
import {
  parseCoordinateCsv,
  parseGeoJson,
  parseGpx,
  serializeGeo,
} from "../../src/geo/formats";

describe("geospatial formats", () => {
  it("parses GeoJSON and preserves safe scalar properties", () => {
    const result = parseGeoJson(
      '{"type":"Feature","properties":{"name":"A","nested":{"x":1}},"geometry":{"type":"Point","coordinates":[13.4,52.5]}}',
    );
    expect(result.collection.features[0]?.properties).toEqual({ name: "A" });
  });
  it("rejects XML document types", () =>
    expect(() => parseGpx("<!DOCTYPE gpx><gpx/>")).toThrow(/DOCTYPE/u));
  it("rejects excessive XML nesting before DOM construction", () =>
    expect(() => parseGpx(`${"<x>".repeat(257)}${"</x>".repeat(257)}`)).toThrow(
      /256-level/u,
    ));
  it("round-trips coordinate CSV into valid GeoJSON", () => {
    const result = parseCoordinateCsv(
      "name,lat,lon,elevation\nBerlin,52.5,13.4,42",
    );
    expect(
      parseGeoJson(serializeGeo(result.collection, "geojson").text).collection,
    ).toEqual(result.collection);
  });
});

describe("geospatial analysis", () => {
  it("uses great-circle distance", () =>
    expect(haversine([0, 0], [1, 0])).toBeCloseTo(111_195, -1));
  it("simplifies a line while preserving endpoints", () =>
    expect(
      simplifyLine(
        [
          [0, 0],
          [0.001, 0.00001],
          [0.002, 0],
        ],
        10,
      ),
    ).toEqual([
      [0, 0],
      [0.002, 0],
    ]));
  it("analyses distance and elevation", () =>
    expect(
      analyseCollection({
        type: "FeatureCollection",
        features: [
          {
            type: "Feature",
            properties: {},
            geometry: {
              type: "LineString",
              coordinates: [
                [0, 0, 10],
                [0.01, 0, 25],
              ],
            },
          },
        ],
      }),
    ).toMatchObject({ points: 2, features: 1, ascent: 15, descent: 0 }));
  it("formats directional DMS", () =>
    expect(toDms(-13.5, "longitude")).toBe("13° 30′ 0.000″ W"));
});