import 'dart:typed_data';

import 'package:flutter_test/flutter_test.dart';

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

void main() {
  group('parseMspRawGps', () {
    test('parst fixType, numSat, lat/lon (1e-7 deg), Speed (cm/s) und HDOP', () {
      // fixType=2, numSat=9, lat=52.5200000 deg, lon=13.4050000 deg,
      // alt=100m (ungenutzt), groundSpeed=1234 cm/s, groundCourse=900 (0.1deg,
      // ungenutzt), hdop=120 (/100 = 1.2).
      final data = ByteData(18);
      data.setUint8(0, 2);
      data.setUint8(1, 9);
      data.setInt32(2, 525200000, Endian.little);
      data.setInt32(6, 134050000, Endian.little);
      data.setUint16(10, 100, Endian.little);
      data.setUint16(12, 1234, Endian.little);
      data.setUint16(14, 900, Endian.little);
      data.setUint16(16, 120, Endian.little);

      final reading = parseMspRawGps(data.buffer.asUint8List());

      expect(reading.fixType, 2);
      expect(reading.hasFix, isTrue);
      expect(reading.numSat, 9);
      expect(reading.lat, closeTo(52.52, 1e-9));
      expect(reading.lon, closeTo(13.405, 1e-9));
      expect(reading.speedMs, closeTo(12.34, 1e-9));
      expect(reading.headingDeg, closeTo(90.0, 1e-9));
      expect(reading.hdop, closeTo(1.2, 1e-9));
    });

    test('fixType 0 bedeutet kein Fix', () {
      final data = ByteData(18);
      final reading = parseMspRawGps(data.buffer.asUint8List());
      expect(reading.hasFix, isFalse);
    });
  });

  group('parseMspAltitudeMeters', () {
    test('estAlt in cm wird zu Metern (auch negativ moeglich)', () {
      final data = ByteData(10);
      data.setInt32(0, 1234, Endian.little); // 12.34 m
      data.setInt16(4, -50, Endian.little);
      data.setInt32(6, 1200, Endian.little);

      expect(
        parseMspAltitudeMeters(data.buffer.asUint8List()),
        closeTo(12.34, 1e-9),
      );
    });

    test('negative Hoehe (unter Startpunkt)', () {
      final data = ByteData(10);
      data.setInt32(0, -250, Endian.little); // -2.5 m
      expect(
        parseMspAltitudeMeters(data.buffer.asUint8List()),
        closeTo(-2.5, 1e-9),
      );
    });
  });

  group('parseMspInavStatusArmed', () {
    Uint8List statusPayload(int armingFlags) {
      final data = ByteData(22);
      data.setUint32(9, armingFlags, Endian.little);
      return data.buffer.asUint8List();
    }

    test('ARMED-Bit (1<<2) gesetzt', () {
      expect(parseMspInavStatusArmed(statusPayload(1 << 2)), isTrue);
    });

    test('nur andere Bits gesetzt, ARMED-Bit fehlt', () {
      expect(parseMspInavStatusArmed(statusPayload(1 << 3)), isFalse);
    });

    test('keine Flags gesetzt', () {
      expect(parseMspInavStatusArmed(statusPayload(0)), isFalse);
    });
  });

  group('parseMspNavStatusActiveWaypoint', () {
    Uint8List navStatusPayload(int activeWpNumber) {
      return Uint8List.fromList([0, 0, 0, activeWpNumber, 0, 0, 0]);
    }

    test('activeWpNumber 0 bedeutet keine aktive Mission', () {
      expect(parseMspNavStatusActiveWaypoint(navStatusPayload(0)), isNull);
    });

    test('activeWpNumber > 0 wird zu einem 0-basierten Index umgerechnet', () {
      expect(parseMspNavStatusActiveWaypoint(navStatusPayload(5)), 4);
    });

    test('activeWpNumber 1 (erster Wegpunkt aktiv) wird zu Index 0', () {
      expect(parseMspNavStatusActiveWaypoint(navStatusPayload(1)), 0);
    });
  });

  group('parseMspNavMode/MspNavMode.formatted', () {
    Uint8List navStatusPayload(int mode, int state) {
      return Uint8List.fromList([mode, state, 0, 0, 0, 0, 0]);
    }

    test('mode 0 (None) ohne state', () {
      final nav = parseMspNavMode(navStatusPayload(0, 0));
      expect(nav.mode, 0);
      expect(nav.state, 0);
      expect(nav.formatted, 'Idle');
    });

    test('mode 3 (Nav/Waypoint) + state 5 (WP_ENROUTE)', () {
      final nav = parseMspNavMode(navStatusPayload(3, 5));
      expect(nav.formatted, 'Waypoint mission (en route to WP)');
    });

    test('mode 2 (RTH) + state 15 (RTH_CLIMB)', () {
      final nav = parseMspNavMode(navStatusPayload(2, 15));
      expect(nav.formatted, 'Return to home (climbing)');
    });

    test('unbekannter mode faellt auf Nummer zurueck', () {
      final nav = parseMspNavMode(navStatusPayload(7, 0));
      expect(nav.formatted, 'Unknown (7)');
    });
  });

  group('parseMspInavAnalogBatteryPercent', () {
    test('liest Batterie-Prozent an Offset 21', () {
      final payload = Uint8List(24);
      payload[21] = 42;
      expect(parseMspInavAnalogBatteryPercent(payload), 42);
    });
  });

  group('parseMspLinkQuality', () {
    test('liest Linkqualitaet an Offset 1', () {
      final payload = Uint8List(3);
      payload[1] = 87;
      expect(parseMspLinkQuality(payload), 87);
    });
  });

  group('parseMspLinkStatsSnr', () {
    test('liest positives SNR an Offset 2', () {
      final payload = Uint8List(3);
      payload[2] = 12;
      expect(parseMspLinkStatsSnr(payload), 12);
    });

    test('liest negatives SNR (vorzeichenbehaftetes Byte) an Offset 2', () {
      // -5 dB als uint8 geschrieben (fc_msp.c: (uint8_t)rxLinkStatistics.
      // uplinkSNR) entspricht 251 (256-5).
      final payload = Uint8List(3);
      payload[2] = 251;
      expect(parseMspLinkStatsSnr(payload), -5);
    });
  });
}