import "dart:async";
import "dart:io";

import "package:bitbox_flutter/bitbox_flutter.dart" as sdk;
import "package:hash_wallet/bitcoin/bitcoin.dart";
import "package:hash_wallet/entities/hardware_wallet/hardware_wallet_device.dart";
import "package:hash_wallet/evm/evm.dart";
import "package:hash_wallet/view_model/hardware_wallet/hardware_wallet_view_model.dart";
import "package:hash_wallet/wallet_type_utils.dart";
import "package:cw_core/hardware/hardware_wallet_service.dart";
import "package:cw_core/root_dir.dart";
import "package:cw_core/utils/print_verbose.dart";
import "package:cw_core/wallet_base.dart";
import "package:cw_core/wallet_info.dart";
import "package:cw_core/wallet_type.dart";
import "package:mobx/mobx.dart";

part "bitbox_view_model.g.dart";

class BitboxViewModel = BitboxViewModelBase with _$BitboxViewModel;

abstract class BitboxViewModelBase extends HardwareWalletViewModel with Store {
  BitboxViewModelBase() {
    if (!Platform.isIOS && !isMoneroOnly) {
      bitboxManager = sdk.BitboxManager();
    }
  }

  late final sdk.BitboxManager bitboxManager;

  BitboxHardwareWalletDevice? _connectedDevice;
  Timer? _isConnectedTimer;

  @override
  HardwareWalletType get hardwareWalletType => HardwareWalletType.bitbox;

  @override
  @observable
  bool isBleEnabled = false;

  @override
  @observable
  bool isConnecting = false;

  @override
  bool get hasBluetooth => Platform.isIOS && false; // TODO(Konsti): remove when we enable bluetooth

  @override
  Future<void> updateBleState() async {}

  @override
  Stream<HardwareWalletDevice> scanForBleDevices() => throw UnimplementedError();

  @override
  Future<List<HardwareWalletDevice>> getAllUsbDevices() => bitboxManager.devices
      .then((devices) => devices.map(BitboxHardwareWalletDevice.new).toList());

  @override
  Future<void> stopScanning() async {}

  @override
  @action
  Future<bool> connectDevice(HardwareWalletDevice device, WalletType type) async {
    if (device is! BitboxHardwareWalletDevice) {
      return false;
    }
    if (isConnecting) {
      return false;
    }
    isConnecting = true;

    try {
      final appDocDir = await getAppDir();

      await bitboxManager.connect(device.device);
      printV("Got Connection", file: "${appDocDir.path}/error.txt");
      await bitboxManager.initBitBox();
      printV("Bitbox initialized!", file: "${appDocDir.path}/error.txt");
      await bitboxManager.channelHashVerify();
      printV("Bitbox channel-hash verified!", file: "${appDocDir.path}/error.txt");

      _connectedDevice = device;
      _isConnectedTimer = Timer.periodic(const Duration(seconds: 1), (_) => _isStillConnected());
      isConnecting = false;
      return true;
    } catch (e) {
      printV(e);
    }
    isConnecting = false;
    _connectedDevice = null;
    _isConnectedTimer?.cancel();
    _isConnectedTimer = null;
    return false;
  }

  @override
  bool isConnected(WalletType type) => _connectedDevice != null;

  Future<void> _isStillConnected() async {
    final devices = await getAllUsbDevices();

    if (!devices.any((d) => d.name == _connectedDevice?.name)) {
      _connectedDevice = null;
      _isConnectedTimer?.cancel();
      _isConnectedTimer = null;
    }
  }

  @override
  HardwareWalletService getHardwareWalletService(WalletType type) {
    switch (type) {
      case WalletType.bitcoin:
        return bitcoin!.getBitboxHardwareWalletService(bitboxManager, true);
      case WalletType.litecoin:
        return bitcoin!.getBitboxHardwareWalletService(bitboxManager, false);
      case WalletType.ethereum:
      case WalletType.polygon:
        return evm!.getBitboxHardwareWalletService(bitboxManager);
      default:
        throw UnimplementedError();
    }
  }

  @override
  Future<void> initWallet(WalletBase wallet) {
    switch (wallet.type) {
      case WalletType.bitcoin:
      case WalletType.litecoin:
        return bitcoin!
            .setHardwareWalletService(wallet, getHardwareWalletService(wallet.type));
      case WalletType.ethereum:
      case WalletType.polygon:
        return evm!.setHardwareWalletService(wallet, getHardwareWalletService(wallet.type));
      default:
        throw Exception("Unexpected wallet type: ${wallet.type} for bitbox");
    }
  }
}