import { describe, it, expect } from 'vitest';
import { toCoordinate, serialize, deserialize } from './notation';
import type { HistoryEntry } from './types';

describe('notation', () => {
  it('renders a move as a coordinate token', () => {
    expect(toCoordinate({ from: 'e2', to: 'e4' })).toBe('e2e4');
    expect(toCoordinate({ from: 'e7', to: 'e8', promotion: 'q' })).toBe('e7e8q');
  });

  it('round-trips a game through serialize/deserialize', () => {
    const history: HistoryEntry[] = [
      { player: 'N', from: 'e2', to: 'e4' },
      { player: 'S', from: 'e2', to: 'e4' },
    ];
    const restored = deserialize(serialize(history));
    expect(restored).toEqual(history);
  });

  it('rejects a file that is not a duplicate-chess save', () => {
    expect(() => deserialize('{"variant":"chess","version":1,"moves":[]}')).toThrow();
  });

  it('rejects an unsupported save version', () => {
    expect(() => deserialize('{"variant":"duplicate-chess","version":99,"moves":[]}')).toThrow();
  });
});