import MultiBitArray from '../../../src/statusList/multiBitArray.js';
import { Buffer } from 'buffer';

describe('MultiBitArray', () => {
  it('should set and get values correctly', () => {
    const buffer = Buffer.alloc(2); // 16 bits
    const mba = MultiBitArray.fromBuffer(buffer, 2); // 2 bits per entry
    mba.set(0, 2); // 10
    mba.set(1, 1); // 01
    expect(mba.get(0)).toBe(2);
    expect(mba.get(1)).toBe(1);
  });

  it('should unset values', () => {
    const buffer = Buffer.alloc(1); // 8 bits
    const mba = MultiBitArray.fromBuffer(buffer, 2);
    mba.set(0, 3); // 11
    mba.unset(0);
    expect(mba.get(0)).toBe(0);
  });

  it('should throw if bitsPerEntry is not a power of 2', () => {
    const buffer = Buffer.alloc(1);
    expect(() => MultiBitArray.fromBuffer(buffer, 3)).toThrow(
      'Bits must be a power of 2',
    );
  });

  it('should throw if bitsPerEntry < 1', () => {
    const buffer = Buffer.alloc(1);
    expect(() => MultiBitArray.fromBuffer(buffer, 0)).toThrow(
      'Bits must be an integer >= 1',
    );
  });

  it('should throw if bitsPerEntry is not integer', () => {
    const buffer = Buffer.alloc(1);
    expect(() => MultiBitArray.fromBuffer(buffer, 1.5)).toThrow(
      'Bits must be an integer >= 1',
    );
  });

  it('should convert to array', () => {
    const buffer = Buffer.from([0b10101010]);
    const mba = MultiBitArray.fromBuffer(buffer, 1);
    expect(Array.from(mba.toArray())).toEqual([0b10101010]);
  });
});