import 'package:flutter_test/flutter_test.dart';

import 'package:dmc_app/domain/telemetry/system_message.dart';
import 'package:dmc_app/transport/flight_controller_link.dart';

TelemetryFrame _frame({
  int batteryPercent = 80,
  int navMode = 0,
  bool hasFix = true,
  int numSat = 10,
}) {
  return TelemetryFrame(
    lat: 52.5,
    lon: 13.4,
    hasFix: hasFix,
    numSat: numSat,
    altitudeM: 100,
    gpsAltitudeM: 100,
    speedMs: 15,
    headingDeg: 0,
    armed: true,
    batteryPercent: batteryPercent,
    batteryVoltage: 22.0,
    currentA: 10.0,
    linkQuality: 90,
    snrDb: 5,
    hdop: 1.0,
    navMode: navMode,
    flightMode: 'Idle',
    sensorStatusBits: 0,
    temperaturesC: const [null, null, null],
    verticalSpeedMs: 0,
  );
}

void main() {
  final now = DateTime(2026, 1, 1, 12, 0, 0);

  group('detectSystemMessages - battery', () {
    test('kein Ereignis ohne vorherigen Frame', () {
      final events = detectSystemMessages(
        previous: null,
        current: _frame(batteryPercent: 15),
        now: now,
      );
      expect(events, isEmpty);
    });

    test('kein Ereignis, solange keine Schwelle unterschritten wird', () {
      final events = detectSystemMessages(
        previous: _frame(batteryPercent: 80),
        current: _frame(batteryPercent: 75),
        now: now,
      );
      expect(events, isEmpty);
    });

    test('"Battery low" beim Unterschreiten von 30%', () {
      final events = detectSystemMessages(
        previous: _frame(batteryPercent: 32),
        current: _frame(batteryPercent: 28),
        now: now,
      );
      expect(events, hasLength(1));
      expect(events.single.severity, SystemMessageSeverity.warning);
      expect(events.single.message, contains('Battery low'));
    });

    test('"Battery critical" beim Unterschreiten von 20%', () {
      final events = detectSystemMessages(
        previous: _frame(batteryPercent: 22),
        current: _frame(batteryPercent: 18),
        now: now,
      );
      expect(events, hasLength(1));
      expect(events.single.severity, SystemMessageSeverity.critical);
      expect(events.single.message, contains('Battery critical'));
    });

    test('nur "Battery critical", wenn beide Schwellen im selben Schritt fallen', () {
      final events = detectSystemMessages(
        previous: _frame(batteryPercent: 35),
        current: _frame(batteryPercent: 15),
        now: now,
      );
      expect(events, hasLength(1));
      expect(events.single.message, contains('Battery critical'));
    });

    test('kein erneutes Ereignis, solange der Ladestand unter der Schwelle bleibt', () {
      final events = detectSystemMessages(
        previous: _frame(batteryPercent: 25),
        current: _frame(batteryPercent: 22),
        now: now,
      );
      expect(events, isEmpty);
    });
  });

  group('detectSystemMessages - failsafe', () {
    test('"Failsafe mode activated" beim Wechsel in Emergency (navMode 15)', () {
      final events = detectSystemMessages(
        previous: _frame(navMode: 3),
        current: _frame(navMode: 15),
        now: now,
      );
      expect(events, hasLength(1));
      expect(events.single.severity, SystemMessageSeverity.critical);
      expect(events.single.message, 'Failsafe mode activated');
    });

    test('kein erneutes Ereignis, solange Emergency anhaelt', () {
      final events = detectSystemMessages(
        previous: _frame(navMode: 15),
        current: _frame(navMode: 15),
        now: now,
      );
      expect(events, isEmpty);
    });
  });

  group('detectSystemMessages - GPS fix', () {
    test('kein Ereignis ohne vorherigen Frame, auch wenn hasFix true ist', () {
      final events = detectSystemMessages(
        previous: null,
        current: _frame(hasFix: true, numSat: 9),
        now: now,
      );
      expect(events, isEmpty);
    });

    test('"GPS fix acquired" beim Uebergang von keinem zu einem Fix', () {
      final events = detectSystemMessages(
        previous: _frame(hasFix: false, numSat: 2),
        current: _frame(hasFix: true, numSat: 9),
        now: now,
      );
      expect(events, hasLength(1));
      expect(events.single.severity, SystemMessageSeverity.info);
      expect(events.single.message, 'GPS fix acquired (9 satellites)');
    });

    test('kein Ereignis, solange der Fix bereits vorher bestand', () {
      final events = detectSystemMessages(
        previous: _frame(hasFix: true, numSat: 8),
        current: _frame(hasFix: true, numSat: 11),
        now: now,
      );
      expect(events, isEmpty);
    });

    test('kein Ereignis beim Verlust des Fixes', () {
      final events = detectSystemMessages(
        previous: _frame(hasFix: true, numSat: 8),
        current: _frame(hasFix: false, numSat: 3),
        now: now,
      );
      expect(events, isEmpty);
    });
  });
}