import {
  packOutgoingPacket,
  unpackIncomingPacket,
} from "../../src/messages/packet";

test("Pack an outgoing packet.", () => {
  // Given
  const messageType = new Uint8Array([0x12, 0x34]);
  const data = new Uint8Array([0x12, 0x34, 0x56, 0x78]);

  // When
  const packedPacket = packOutgoingPacket({
    messageType: messageType,
    data: data,
  });

  // Then
  const expectedResult = new Uint8Array([
    // Message type
    0x12, 0x34,
    // Data length
    0x00, 0x04,
    // Data
    0x12, 0x34, 0x56, 0x78,
  ]);
  expect(packedPacket).toMatchObject(expectedResult);
});

test("Unpack an incoming packet.", () => {
  // Given
  const incomingPacket = new Uint8Array([
    // Message type
    0x12, 0x34,
    // Sender ID
    0xaa, 0xbb, 0xcc, 0xdd,
    // Data length
    0x00, 0x04,
    // Data
    0x12, 0x34, 0x56, 0x78,
  ]);

  // When
  const unpackedResult = unpackIncomingPacket(incomingPacket);

  // Then
  expect(unpackedResult.messageType).toBe(0x1234);
  expect(unpackedResult.senderId).toBe(0xaabbccdd);
  expect(unpackedResult.data).toMatchObject(
    new Uint8Array([0x12, 0x34, 0x56, 0x78]),
  );
});