import 'dart:typed_data';

import 'package:flutter_test/flutter_test.dart';

import 'package:dmc_app/transport/msp/msp_frame.dart';

/// Erwartete Bytefolgen unabhaengig (in Python, CRC8-DVB-S2 mit Poly 0xD5,
/// Startwert 0) nachgerechnet - siehe Kommentare.
void main() {
  group('crc8DvbS2', () {
    test('leerer Header (flags=0, function=106, size=0) ergibt 0x93', () {
      final header = Uint8List.fromList([0x00, 0x6A, 0x00, 0x00, 0x00]);
      expect(crc8DvbS2Update(0, header), 0x93);
    });
  });

  group('encodeMspV2Request', () {
    test('MSP_RAW_GPS (106) ohne Payload', () {
      final bytes = encodeMspV2Request(106);
      expect(bytes, Uint8List.fromList([
        0x24, 0x58, 0x3C, // '$', 'X', '<'
        0x00, 0x6A, 0x00, 0x00, 0x00, // flags, fn LE, size LE
        0x93, // crc
      ]));
    });

    test('MSP2_INAV_STATUS (0x2000) ohne Payload', () {
      final bytes = encodeMspV2Request(0x2000);
      expect(bytes, Uint8List.fromList([
        0x24, 0x58, 0x3C,
        0x00, 0x00, 0x20, 0x00, 0x00,
        0x32,
      ]));
    });

    test('Anfrage mit Payload', () {
      final bytes = encodeMspV2Request(
        1,
        Uint8List.fromList([0xAA, 0xBB, 0xCC]),
      );
      expect(bytes, Uint8List.fromList([
        0x24, 0x58, 0x3C,
        0x00, 0x01, 0x00, 0x03, 0x00,
        0xAA, 0xBB, 0xCC,
        0x1A,
      ]));
    });
  });

  group('encodeMspV2Frame', () {
    test('Antwortrahmen (dir = \'>\') fuer MSP_ALTITUDE', () {
      // estAlt=1234cm (i32 LE), vario=-50cm/s (i16 LE), baroAlt=1200cm (i32 LE)
      final payload = Uint8List.fromList(
        [0xD2, 0x04, 0x00, 0x00, 0xCE, 0xFF, 0xB0, 0x04, 0x00, 0x00],
      );
      final bytes = encodeMspV2Frame(MspDirection.response, 109, payload);
      expect(
        bytes,
        Uint8List.fromList([
          0x24, 0x58, 0x3E,
          0x00, 0x6D, 0x00, 0x0A, 0x00,
          ...payload,
          0x73,
        ]),
      );
    });
  });
}