import { createRequire } from 'node:module';
import { describe, expect, it } from 'vitest';
import { MAP_HEIGHT, MAP_WIDTH, buildWorldGeometry, fitProjection } from '@/lib/map-geo';

const require = createRequire(import.meta.url);
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const atlas = require('world-atlas/countries-110m.json') as any;

describe('fitProjection (Equal Earth)', () => {
  it('maps the origin to the centre of the viewport and keeps the sphere inside it', () => {
    const p = fitProjection({ type: 'Sphere' });
    const c = p([0, 0])!;
    expect(c[0]).toBeCloseTo(MAP_WIDTH / 2, 0);
    expect(c[1]).toBeCloseTo(MAP_HEIGHT / 2, 0);
    for (const [lng, lat] of [
      [-180, 0],
      [180, 0],
      [0, 90],
      [0, -90],
      [-73.6, 45.5],
    ] as Array<[number, number]>) {
      const q = p([lng, lat])!;
      expect(q[0]).toBeGreaterThanOrEqual(0);
      expect(q[0]).toBeLessThanOrEqual(MAP_WIDTH);
      expect(q[1]).toBeGreaterThanOrEqual(0);
      expect(q[1]).toBeLessThanOrEqual(MAP_HEIGHT);
    }
    // west is left, north is up
    const montreal = p([-73.6, 45.5])!;
    const tokyo = p([139.7, 35.7])!;
    const capeTown = p([18.4, -33.9])!;
    expect(montreal[0]).toBeLessThan(tokyo[0]);
    expect(montreal[1]).toBeLessThan(capeTown[1]);
  });
});

describe('buildWorldGeometry', () => {
  const geo = buildWorldGeometry(atlas);
  it('produces one path per country with ISO3 keys, without Antarctica', () => {
    expect(geo.countries.length).toBeGreaterThan(170);
    const iso = geo.countries.map((c) => c.iso3);
    expect(iso).toContain('USA');
    expect(iso).toContain('FRA');
    expect(iso).toContain('KOR');
    expect(iso).toContain('XKX');
    expect(iso).not.toContain('ATA');
    expect(geo.countries.filter((c) => c.iso3 === null).map((c) => c.name).sort()).toEqual(['N. Cyprus', 'Somaliland']);
    for (const c of geo.countries) expect(c.d.length).toBeGreaterThan(5);
    expect(geo.sphere.startsWith('M')).toBe(true);
  });
  it('projects lng/lat to viewBox pixels and rejects invalid coordinates', () => {
    const p = geo.project(-73.6, 45.5)!;
    expect(p[0]).toBeGreaterThan(0);
    expect(p[0]).toBeLessThan(MAP_WIDTH / 2);
    expect(p[1]).toBeLessThan(MAP_HEIGHT / 2);
    expect(geo.project(NaN, 10)).toBeNull();
    expect(geo.project(10, 91)).toBeNull();
    expect(geo.project(181, 0)).toBeNull();
  });
});