import { createRequire } from 'node:module';
import { describe, expect, it } from 'vitest';
import { ATLAS_NAME_TO_ALPHA3, ISO_NUMERIC_TO_ALPHA3, atlasGeometryIso3 } from '@/lib/iso-numeric';

const require = createRequire(import.meta.url);
const atlas = require('world-atlas/countries-110m.json') as { objects: { countries: { geometries: Array<{ id?: string; properties: { name: string } }> } } };

describe('ISO numeric → alpha-3', () => {
  it('has well-formed keys and values', () => {
    for (const [k, v] of Object.entries(ISO_NUMERIC_TO_ALPHA3)) {
      expect(k).toMatch(/^\d{3}$/);
      expect(v).toMatch(/^[A-Z]{3}$/);
    }
    const values = Object.values(ISO_NUMERIC_TO_ALPHA3);
    expect(new Set(values).size).toBe(values.length);
  });
  it('resolves a few well-known codes', () => {
    expect(atlasGeometryIso3('840')).toBe('USA');
    expect(atlasGeometryIso3(840)).toBe('USA');
    expect(atlasGeometryIso3('004')).toBe('AFG');
    expect(atlasGeometryIso3(4)).toBe('AFG');
    expect(atlasGeometryIso3('410')).toBe('KOR');
    expect(atlasGeometryIso3('158')).toBe('TWN');
    expect(atlasGeometryIso3('275')).toBe('PSE');
    expect(atlasGeometryIso3(undefined, 'Kosovo')).toBe('XKX');
    expect(atlasGeometryIso3(undefined, 'N. Cyprus')).toBeNull();
    expect(atlasGeometryIso3(undefined, 'Somaliland')).toBeNull();
    expect(atlasGeometryIso3(undefined, 'Nowhere')).toBeNull();
    expect(atlasGeometryIso3('999')).toBeNull();
  });
  it('covers every geometry in world-atlas countries-110m (id or name fallback)', () => {
    const geoms = atlas.objects.countries.geometries;
    expect(geoms.length).toBeGreaterThan(170);
    const unresolved = geoms.filter((g) => g.id != null && atlasGeometryIso3(g.id, g.properties.name) === null).map((g) => `${g.id} ${g.properties.name}`);
    expect(unresolved).toEqual([]);
    const idless = geoms.filter((g) => g.id == null).map((g) => g.properties.name);
    for (const n of idless) expect(n in ATLAS_NAME_TO_ALPHA3).toBe(true);
  });
});