cake_wallet/lib/view_model/lightning_view_model.dart

import 'dart:async';
import 'package:breez_sdk/breez_sdk.dart';
import 'package:breez_sdk/bridge_generated.dart' as BZG;
import 'package:cake_wallet/entities/calculate_fiat_amount_raw.dart';
import 'package:cake_wallet/entities/fiat_currency.dart';
import 'package:cake_wallet/lightning/lightning.dart';
import 'package:cake_wallet/store/dashboard/fiat_conversion_store.dart';
import 'package:cake_wallet/store/settings_store.dart';
import 'package:cw_core/crypto_currency.dart';
import 'package:mobx/mobx.dart';

part 'lightning_view_model.g.dart';

class LightningViewModel = LightningViewModelBase with _$LightningViewModel;

abstract class LightningViewModelBase with Store {
  LightningViewModelBase({
    required this.settingsStore,
    required this.fiatConversionStore,
  }) {}

  final SettingsStore settingsStore;
  final FiatConversionStore fiatConversionStore;
  
  @observable
  bool loading = false;

  @action
  void setLoading(bool value) {
    loading = value;
  }

  FiatCurrency get fiat => settingsStore.fiatCurrency;

  String formattedFiatAmount(int sats) {
    String amount = calculateFiatAmountRaw(
      cryptoAmount: lightning!.formatterLightningAmountToDouble(amount: sats),
      price: fiatConversionStore.prices[CryptoCurrency.btcln],
    );
    return amount;
  }

  Future<List<String>> receiveOnchain() async {
    final sdk = await BreezSDK();

    BZG.ReceiveOnchainRequest req = const BZG.ReceiveOnchainRequest();
    BZG.SwapInfo swapInfo = await sdk.receiveOnchain(req: req);
    print("Minimum amount allowed to deposit in sats: ${swapInfo.minAllowedDeposit}");
    print("Maximum amount allowed to deposit in sats: ${swapInfo.maxAllowedDeposit}");
    int fee = swapInfo.channelOpeningFees?.minMsat ?? 2000;
    fee = fee ~/ 1000;
    return [
      swapInfo.bitcoinAddress,
      swapInfo.minAllowedDeposit.toString(),
      swapInfo.maxAllowedDeposit.toString(),
      fee.toString(),
    ];
  }

  Future<String> createInvoice({required String amountSats, String? description}) async {
    final sdk = await BreezSDK();
    final req = BZG.ReceivePaymentRequest(
      amountMsat: (double.parse(amountSats) * 1000).round(),
      description: description ?? '',
    );
    final res = await sdk.receivePayment(req: req);
    return res.lnInvoice.bolt11;
  }

  Future<List<int>> invoiceSoftLimitsSats() async {
    final sdk = await BreezSDK();
    BZG.ReceivePaymentRequest? req = null;
    req = BZG.ReceivePaymentRequest(
      amountMsat: 10000 * 1000, // 10000 sats
      description: "limits",
    );
    final res = await sdk.receivePayment(req: req);
    int min = (res.openingFeeMsat ?? (2500 * 1000)) ~/ 1000;
    int max = 1000000000 * 1000 * 10; // 10 BTC

    int balance = 0;

    try {
      final nodeState = (await sdk.nodeInfo())!;
      max = nodeState.inboundLiquidityMsats ~/ 1000;
      balance = nodeState.channelsBalanceMsat ~/ 1000;
      if (balance > 0) {
        min = 0;
      }
    } catch (_) {}
    return [min, max, balance];
  }

  Future<int> getBalanceSats() async {
    try {
      final sdk = await BreezSDK();
      final nodeState = (await sdk.nodeInfo())!;
      return nodeState.channelsBalanceMsat ~/ 1000;
    } catch (_) {
      return 0;
    }
  }
}