import { applyDirectionScope, scopedDirections } from './trade-scope.util';

/**
 * The scope decides what a restricted user may see, so the cases that matter
 * are the ones where a wrong answer widens access: an unrestricted fallback
 * where a restriction was configured, or an out-of-scope explicit filter
 * being honoured instead of denied.
 */
describe('scopedDirections', () => {
  it('leaves an unrestricted user unfiltered', () => {
    expect(scopedDirections(null)).toBeNull();
  });

  it('honours an explicit filter for an unrestricted user', () => {
    expect(scopedDirections(null, 'EXPORT')).toEqual(['EXPORT']);
  });

  it('falls back to the full scope when no filter is requested', () => {
    expect(scopedDirections(['EXPORT'])).toEqual(['EXPORT']);
  });

  it('narrows to the intersection when the filter is in scope', () => {
    expect(scopedDirections(['IMPORT', 'EXPORT'], 'EXPORT')).toEqual(['EXPORT']);
  });

  it('denies an out-of-scope filter instead of widening access', () => {
    expect(scopedDirections(['EXPORT'], 'IMPORT')).toEqual([]);
  });
});

describe('applyDirectionScope', () => {
  const makeQb = () => {
    const calls: { sql: string; params?: object }[] = [];
    const qb = {
      calls,
      andWhere(sql: string, params?: object) {
        calls.push({ sql, params });
        return qb;
      },
    };
    return qb;
  };

  it('does not touch the query when unrestricted', () => {
    const qb = makeQb();
    applyDirectionScope(qb as never, 'booking.trade_direction', null);
    expect(qb.calls).toHaveLength(0);
  });

  it('matches nothing on an empty scope rather than everything', () => {
    const qb = makeQb();
    applyDirectionScope(qb as never, 'booking.trade_direction', []);
    expect(qb.calls[0].sql).toBe('1 = 0');
  });

  it('filters to the allowed directions', () => {
    const qb = makeQb();
    applyDirectionScope(qb as never, 'booking.trade_direction', ['EXPORT']);
    expect(qb.calls[0].sql).toContain('booking.trade_direction IN');
    expect(qb.calls[0].params).toEqual({
      scopeDirs_booking_trade_direction: ['EXPORT'],
    });
  });
});