import { describe, it, expect } from 'vitest';
import { computeBoundingBox, boundingBoxRing } from '$domain';
import type { LatLngTuple } from '$domain';

describe('computeBoundingBox', () => {
	it('returns null for an empty path', () => {
		expect(computeBoundingBox([])).toBeNull();
	});

	it('wraps the extremes and expands by the margin', () => {
		const path: LatLngTuple[] = [
			[62.0, 129.0],
			[62.5, 130.0]
		];
		const box = computeBoundingBox(path, 0)!;
		expect(box.south).toBeCloseTo(62.0, 6);
		expect(box.north).toBeCloseTo(62.5, 6);
		expect(box.west).toBeCloseTo(129.0, 6);
		expect(box.east).toBeCloseTo(130.0, 6);

		const padded = computeBoundingBox(path, 5)!;
		expect(padded.south).toBeLessThan(62.0);
		expect(padded.north).toBeGreaterThan(62.5);
		expect(padded.west).toBeLessThan(129.0);
		expect(padded.east).toBeGreaterThan(130.0);
	});
});

describe('boundingBoxRing', () => {
	it('is a closed ring of 5 corners (SW repeated)', () => {
		const ring = boundingBoxRing({ south: 1, west: 2, north: 3, east: 4 });
		expect(ring).toHaveLength(5);
		expect(ring[0]).toEqual(ring[4]);
	});
});