import { describe, expect, it } from 'vitest';
import { marshall, unmarshall } from '../index.js';

describe('DynamoDB attribute values', () => {
  it('round-trips nested scalar, list, map, null, and undefined values', () => {
    const value = {
      string: 'value',
      number: 42.5,
      boolean: false,
      nil: null,
      missing: undefined,
      list: ['a', 2, true, null],
      map: { nested: 'yes', count: 3 },
    };

    expect(unmarshall(marshall(value))).toEqual({
      string: 'value',
      number: 42.5,
      boolean: false,
      nil: null,
      missing: null,
      list: ['a', 2, true, null],
      map: { nested: 'yes', count: 3 },
    });
  });

  it('returns an empty record for non-object roots', () => {
    expect(marshall(null)).toEqual({});
    expect(marshall(undefined)).toEqual({});
    expect(marshall('value')).toEqual({});
    expect(marshall(42)).toEqual({});
  });

  it('decodes string, number, and binary sets', () => {
    expect(
      unmarshall({
        strings: { SS: ['a', 'b'] },
        numbers: { NS: ['1', '2.5'] },
        binary: { BS: ['YQ==', 'Yg=='] },
      }),
    ).toEqual({
      strings: ['a', 'b'],
      numbers: [1, 2.5],
      binary: ['YQ==', 'Yg=='],
    });
  });

  it('maps unsupported values to null', () => {
    expect(
      marshall({ symbol: Symbol('x'), function: () => undefined }),
    ).toEqual({
      symbol: { NULL: true },
      function: { NULL: true },
    });
  });
});