import 'package:flutter_test/flutter_test.dart';

import 'package:dmc_app/transport/bluetooth/bluetooth_device_info.dart';
import 'package:dmc_app/transport/bluetooth/bluetooth_device_selector.dart';

void main() {
  const remembered = BluetoothDeviceInfo(address: '11:11:11:11:11:11', name: 'Alt-Geraet');
  const mLrs = BluetoothDeviceInfo(address: '22:22:22:22:22:22', name: 'mLRS-a1b2');
  const other = BluetoothDeviceInfo(address: '33:33:33:33:33:33', name: 'Kopfhoerer');

  test('gemerkte MAC-Adresse hat Vorrang vor mLRS-Praefix (Doku 3.2a)', () {
    final result = selectBluetoothDevice(
      bondedDevices: [other, mLrs, remembered],
      rememberedAddress: remembered.address,
    );

    expect(result, isA<BluetoothDeviceResolved>());
    expect((result as BluetoothDeviceResolved).device, remembered);
  });

  test(
      'ohne (noch gueltige) gemerkte Adresse gewinnt das erste Geraet mit '
      'mLRS-Praefix (Doku 3.2b)', () {
    final result = selectBluetoothDevice(
      bondedDevices: [other, mLrs],
      rememberedAddress: null,
    );

    expect(result, isA<BluetoothDeviceResolved>());
    expect((result as BluetoothDeviceResolved).device, mLrs);
  });

  test(
      'gemerkte Adresse ist nicht mehr gekoppelt -> faellt auf mLRS-Praefix '
      'zurueck statt zu scheitern', () {
    final result = selectBluetoothDevice(
      bondedDevices: [other, mLrs],
      rememberedAddress: '99:99:99:99:99:99',
    );

    expect(result, isA<BluetoothDeviceResolved>());
    expect((result as BluetoothDeviceResolved).device, mLrs);
  });

  test(
      'weder gemerkte Adresse noch mLRS-Praefix -> Auswahlliste noetig '
      '(Doku 3.2c)', () {
    final result = selectBluetoothDevice(
      bondedDevices: [other],
      rememberedAddress: null,
    );

    expect(result, isA<BluetoothDeviceSelectionRequired>());
    expect(
      (result as BluetoothDeviceSelectionRequired).candidates,
      [other],
    );
  });

  test('keine gekoppelten Geraete -> Auswahlliste ist leer, kein Fehler', () {
    final result = selectBluetoothDevice(
      bondedDevices: const [],
      rememberedAddress: null,
    );

    expect(result, isA<BluetoothDeviceSelectionRequired>());
    expect((result as BluetoothDeviceSelectionRequired).candidates, isEmpty);
  });

  test('Praefix-Pruefung ist case-sensitiv wie in der Doku spezifiziert', () {
    const lowerCase = BluetoothDeviceInfo(
      address: '44:44:44:44:44:44',
      name: 'mlrs-nicht-erkannt',
    );

    final result = selectBluetoothDevice(
      bondedDevices: [lowerCase],
      rememberedAddress: null,
    );

    expect(result, isA<BluetoothDeviceSelectionRequired>());
  });
}