import 'package:hash_wallet/bitcoin/bitcoin.dart';
import 'package:hash_wallet/core/utilities.dart';
import 'package:hash_wallet/entities/balance_display_mode.dart';
import 'package:hash_wallet/entities/calculate_fiat_amount.dart';
import 'package:hash_wallet/entities/fiat_api_mode.dart';
import 'package:hash_wallet/entities/sort_balance_types.dart';
import 'package:hash_wallet/generated/i18n.dart';
import 'package:hash_wallet/reactions/wallet_connect.dart';
import 'package:hash_wallet/evm/evm.dart';
import 'package:cw_core/crypto_amount_format.dart';
import 'package:cw_core/transaction_history.dart';
import 'package:cw_core/wallet_base.dart';
import 'package:hash_wallet/store/app_store.dart';
import 'package:hash_wallet/store/dashboard/fiat_conversion_store.dart';
import 'package:hash_wallet/store/settings_store.dart';
import 'package:cw_core/balance.dart';
import 'package:cw_core/crypto_currency.dart';
import 'package:cw_core/erc20_token.dart';
import 'package:cw_core/spl_token.dart';
import 'package:cw_core/transaction_info.dart';
import 'package:cw_core/wallet_type.dart';
import 'package:mobx/mobx.dart';

part 'balance_view_model.g.dart';

class BalanceRecord {
  const BalanceRecord({
    required this.availableBalance,
    required this.additionalBalance,
    required this.secondAvailableBalance,
    required this.secondAdditionalBalance,
    required this.frozenBalance,
    required this.fiatAvailableBalance,
    required this.fiatAdditionalBalance,
    required this.fiatFrozenBalance,
    required this.fiatSecondAvailableBalance,
    required this.fiatSecondAdditionalBalance,
    required this.asset,
    required this.secondAsset,
    required this.formattedAssetTitle,
  });

  final String fiatAdditionalBalance;
  final String fiatAvailableBalance;
  final String fiatFrozenBalance;
  final String additionalBalance;
  final String availableBalance;
  final String frozenBalance;
  final String secondAvailableBalance;
  final String secondAdditionalBalance;
  final String fiatSecondAdditionalBalance;
  final String fiatSecondAvailableBalance;
  final CryptoCurrency asset;
  final CryptoCurrency secondAsset;
  final String formattedAssetTitle;

  String get combinedAvailableBalance =>
      ((double.tryParse(availableBalance) ?? 0) + (double.tryParse(secondAvailableBalance) ?? 0))
          .toString().withMaxDecimals(8);

  String get combinedFiatAvailableBalance =>
      ((double.tryParse(fiatAvailableBalanceRaw) ?? 0) +
              (double.tryParse(fiatSecondAvailableBalanceRaw) ?? 0))
          .toStringAsFixed(2);

  String get fiatAvailableBalanceRaw => fiatAvailableBalance.split(" ").last;
  String get fiatSecondAvailableBalanceRaw => fiatSecondAvailableBalance.split(" ").last;
  String get fiatCurrencyTicker => fiatAvailableBalance.split(" ").first;
}

class BalanceViewModel = BalanceViewModelBase with _$BalanceViewModel;

abstract class BalanceViewModelBase with Store {
  BalanceViewModelBase(
      {required this.appStore, required this.settingsStore, required this.fiatConversionStore})
      : isReversing = false,
        isShowCard = appStore.wallet?.walletInfo.isShowIntroCakePayCard ?? false,
        wallet = appStore.wallet! {
    reaction((_) => appStore.wallet, (wallet) {
      _onWalletChange(wallet);
      _checkMweb();
    });

    _checkMweb();

    reaction((_) => settingsStore.mwebAlwaysScan, (_) => _checkMweb());
  }

  void _checkMweb() {
    if (wallet.type == WalletType.litecoin) {
      mwebEnabled = bitcoin!.getMwebEnabled(wallet);
    }
  }

  final AppStore appStore;
  final SettingsStore settingsStore;
  final FiatConversionStore fiatConversionStore;

  @observable
  bool isReversing;

  @observable
  WalletBase<Balance, TransactionHistoryBase<TransactionInfo>, TransactionInfo> wallet;

  @computed
  double get price {
    final price = fiatConversionStore.prices[appStore.wallet!.currency];

    // price should update on next fetch:
    if (price == null) return 0;

    return price;
  }

  @computed
  BalanceDisplayMode get savedDisplayMode => settingsStore.balanceDisplayMode;

  @computed
  bool get isFiatDisabled => settingsStore.fiatApiMode == FiatApiMode.disabled;

  @computed
  bool get isHomeScreenSettingsEnabled => isEVMCompatibleChain(wallet.type);

  @computed
  bool get isEVMCompatible => isEVMCompatibleChain(wallet.type);

  @computed
  bool get hasAccounts => [WalletType.monero, WalletType.wownero].contains(wallet.type);

  @computed
  SortBalanceBy get sortBalanceBy => settingsStore.sortBalanceBy;

  @computed
  bool get pinNativeToken => settingsStore.pinNativeTokenAtTop;

  @computed
  String get asset {
    if (isEVMCompatibleChain(wallet.type)) {
      final currentChain = evm!.getCurrentChain(wallet);
      if (currentChain != null) {
        return currentChain.name;
      }

      return walletTypeToString(wallet.type);
    }

    final typeFormatted = walletTypeToString(wallet.type);

    return typeFormatted;
  }

  @computed
  BalanceDisplayMode get displayMode {
    if (isReversing) {
      if (savedDisplayMode == BalanceDisplayMode.hiddenBalance) {
        return BalanceDisplayMode.displayableBalance;
      } else {
        return BalanceDisplayMode.hiddenBalance;
      }
    }

    return savedDisplayMode;
  }

  @computed
  String get availableBalanceLabel {
    if (displayMode == BalanceDisplayMode.hiddenBalance) {
      return S.current.show_balance;
    } else {
      return S.current.xmr_available_balance;
    }
  }

  @computed
  String get additionalBalanceLabel {
    switch (wallet.type) {
      case WalletType.ethereum:
      case WalletType.polygon:
      case WalletType.base:
      case WalletType.arbitrum:
      case WalletType.bsc:
        return S.current.xmr_full_balance;
      case WalletType.nano:
      case WalletType.banano:
        return S.current.receivable_balance;
      default:
        return S.current.unconfirmed;
    }
  }

  @computed
  String get secondAvailableBalanceLabel {
    switch (wallet.type) {
      case WalletType.litecoin:
        return S.current.mweb_confirmed;
      default:
        return S.current.confirmed;
    }
  }

  @computed
  String get secondAdditionalBalanceLabel {
    switch (wallet.type) {
      case WalletType.litecoin:
        return S.current.mweb_unconfirmed;
      default:
        return S.current.unconfirmed;
    }
  }

  String additionalBalance(CryptoCurrency cryptoCurrency) {
    final balance = _currencyBalance(cryptoCurrency);

    if (displayMode == BalanceDisplayMode.hiddenBalance || balance.additional == BigInt.zero) return '0.0';

    return cryptoCurrency.formatAmount(balance.additional);
  }

  @computed
  Map<CryptoCurrency, BalanceRecord> get balances {
    return wallet.balance.map((key, value) {
      var secondAsset = key == CryptoCurrency.ltc ? CryptoCurrency.ltcmweb : key;

      if (displayMode == BalanceDisplayMode.hiddenBalance) {
        final fiatCurrency = settingsStore.fiatCurrency;
        return MapEntry(
            key,
            BalanceRecord(
                availableBalance: '●●●●●●',
                additionalBalance: additionalBalance(key),
                frozenBalance: '',
                secondAvailableBalance: '●●●●●●',
                secondAdditionalBalance: '●●●●●●',
                fiatAdditionalBalance: isFiatDisabled ? '' : '${fiatCurrency.toString()} ●●●●●',
                fiatAvailableBalance: isFiatDisabled ? '' : '${fiatCurrency.toString()} ●●●●●',
                fiatFrozenBalance: isFiatDisabled ? '' : '',
                fiatSecondAvailableBalance:
                    isFiatDisabled ? '' : '${fiatCurrency.toString()}',
                fiatSecondAdditionalBalance:
                    isFiatDisabled ? '' : '${fiatCurrency.toString()} ●●●●●',
                asset: key,
                secondAsset: secondAsset,
                formattedAssetTitle: _formatterAsset(key)));
      }
      final fiatCurrency = settingsStore.fiatCurrency;
      final price = key.isPotentialScam
          ? 0.0
          : fiatConversionStore.prices[key == CryptoCurrency.btcln ? CryptoCurrency.btc : key] ?? 0;

      // if (price == null) {
      //   throw Exception('Price is null for: $key');
      // }

      final available = evm?.getERC20AvailableBalance(value) ??
          (value.fullAvailableBalance - (value.secondAvailable ?? BigInt.zero));
      final additional = evm?.getERC20AvailableBalance(value) ??
          (value.additional - (value.secondAdditional ?? BigInt.zero));

      final availableFiatBalance = isFiatDisabled
          ? ''
          : '$fiatCurrency ${_getFiatBalance(price: price, cryptoAmount: key.formatAmount(available))}';

      final additionalFiatBalance = isFiatDisabled
          ? ''
          : '$fiatCurrency ${_getFiatBalance(price: price, cryptoAmount: key.formatAmount(additional))}';

      final frozenFiatBalance = isFiatDisabled
          ? ''
          : '$fiatCurrency ${_getFiatBalance(price: price, cryptoAmount: value.frozen != null ? key.formatAmount(value.frozen!) : null)}';

      final secondAvailableFiatBalance = isFiatDisabled
          ? ''
          : '$fiatCurrency ${_getFiatBalance(price: price, cryptoAmount: value.secondAvailable != null ? key.formatAmount(value.secondAvailable!) : null)}';

      final secondAdditionalFiatBalance = isFiatDisabled
          ? ''
          : '$fiatCurrency ${_getFiatBalance(price: price, cryptoAmount: value.secondAdditional != null ? key.formatAmount(value.secondAdditional!) : null)}';

      return MapEntry(
        key,
        BalanceRecord(
          availableBalance: _getFormattedCryptoAmount(key, available),
          fiatAvailableBalance: availableFiatBalance,
          additionalBalance: _getFormattedCryptoAmount(key, additional),
          fiatAdditionalBalance: additionalFiatBalance,
          frozenBalance:
              (value.frozen ?? BigInt.zero) > BigInt.zero ? _getFormattedCryptoAmount(key, value.frozen??BigInt.zero) : '',
          fiatFrozenBalance: frozenFiatBalance,
          secondAvailableBalance: _getFormattedCryptoAmount(secondAsset, value.secondAvailable??BigInt.zero),
          fiatSecondAvailableBalance: secondAvailableFiatBalance,
          secondAdditionalBalance: _getFormattedCryptoAmount(secondAsset, value.secondAdditional??BigInt.zero),
          fiatSecondAdditionalBalance: secondAdditionalFiatBalance,
          asset: key,
          secondAsset: secondAsset,
          formattedAssetTitle: _formatterAsset(key),
        ),
      );
    });
  }

  @observable
  bool mwebEnabled = false;

  bool hasAdditionalBalance(CryptoCurrency currency) {
    final isWalletTypeActivated = _hasAdditionalBalanceForWalletType(wallet.type);
    final isNotZeroAmount = additionalBalance(currency) != "0.0";

    return isWalletTypeActivated && isNotZeroAmount;
  }

  @computed
  bool get hasSecondAdditionalBalance {
    if (wallet.type == WalletType.litecoin && mwebEnabled) {
      return (wallet.balance[CryptoCurrency.ltc]?.secondAdditional ?? 0) != 0;
    } else if (wallet.type == WalletType.bitcoin) {
      return (wallet.balance[CryptoCurrency.btc]?.secondAdditional ?? 0) != 0;
    }
    return false;
  }

  @computed
  bool get hasSecondAvailableBalance {
    switch (wallet.type) {
      case WalletType.bitcoin:
        return true;
      case WalletType.litecoin:
        return mwebEnabled;
      default:
        return false;
    }
  }

  bool _hasAdditionalBalanceForWalletType(WalletType type) => [
        WalletType.monero,
        WalletType.wownero,
      ].contains(type);

  String _getFormattedCryptoAmount(CryptoCurrency cryptoCurrency, BigInt? amount) {
    if (amount == null) return "";

    return appStore.amountParsingProxy
        .getDisplayCryptoStringFromBigInt(amount, cryptoCurrency)
        .withMaxDecimals(8).withLocalSeperator(settingsStore.languageCode);
  }

  @computed
  List<BalanceRecord> get formattedBalances {
    final balance = balances.values.toList();

    balance.sort((BalanceRecord a, BalanceRecord b) {
      if (wallet.currency == CryptoCurrency.xhv) {
        if (b.asset == CryptoCurrency.xhv) return 1;

        if (b.asset == CryptoCurrency.xusd) {
          if (a.asset == CryptoCurrency.xhv) return -1;
          return 1;
        }

        if (b.asset == CryptoCurrency.xbtc) return 1;
        if (b.asset == CryptoCurrency.xeur) return 1;

        return 0;
      }

      if (pinNativeToken) {
        if (b.asset == wallet.currency) return 1;
        if (a.asset == wallet.currency) return -1;
      }

      final isTokenWallet = isEVMCompatibleChain(wallet.type);

      if (isTokenWallet) {
        final aIsToken = a.asset is Erc20Token || a.asset is SPLToken;
        final bIsToken = b.asset is Erc20Token || b.asset is SPLToken;

        final aHasBalance = (double.tryParse(a.availableBalance) ?? 0) > 0;
        final bHasBalance = (double.tryParse(b.availableBalance) ?? 0) > 0;

        // Adding this so tokens with balance come before tokens without balance
        if (aIsToken && bIsToken) {
          if (aHasBalance && !bHasBalance) return -1;
          if (!aHasBalance && bHasBalance) return 1;
        }
      }

      switch (sortBalanceBy) {
        case SortBalanceBy.FiatBalance:
          final aFiatBalance = _getFiatBalance(
              price: fiatConversionStore.prices[a.asset] ?? 0, cryptoAmount: a.availableBalance);
          final bFiatBalance = _getFiatBalance(
              price: fiatConversionStore.prices[b.asset] ?? 0, cryptoAmount: b.availableBalance);

          return (double.tryParse(bFiatBalance) ?? 0)
              .compareTo((double.tryParse(aFiatBalance)) ?? 0);
        case SortBalanceBy.GrossBalance:
          return (double.tryParse(b.availableBalance) ?? 0)
              .compareTo(double.tryParse(a.availableBalance) ?? 0);
        case SortBalanceBy.Alphabetical:
          return a.asset.title.compareTo(b.asset.title);
      }
    });

    return balance;
  }

  BalanceRecord? getMainBalanceRecord(bool lightningMode) {
    if (lightningMode) {
      return formattedBalances.elementAtOrNull(1);
    }

    if (wallet.walletInfo.favoriteTokenAddress != null) {
      return formattedBalances.firstWhereOrNull((item) => (getTokenAddressBasedOnWallet(item.asset) ==
                  wallet.walletInfo.favoriteTokenAddress)) ??
          formattedBalances.elementAt(0);
    }

    return formattedBalances.elementAt(0);
  }

  String? getTokenAddressBasedOnWallet(CryptoCurrency asset) {
    if (isEVMCompatibleChain(wallet.type) && asset is Erc20Token) {
      return evm!.getTokenAddress(asset);
    }

    return null;
  }

  @computed
  bool get showCombinedBalance {
    if(wallet.type == WalletType.bitcoin) return false;
    if(balances.values.length == 1) return false;

    return wallet.walletInfo.showCombinedBalance;
  }

  @computed
  String get combinedFiatBalance {
    if (displayMode == BalanceDisplayMode.hiddenBalance) {
      return "●●●●●";
    }

    double ret = 0.0;
    for (final curr in wallet.balance.keys) {
      final record = wallet.balance[curr]!;
      final available = evm?.getERC20AvailableBalance(record) ??
          (record.fullAvailableBalance - (record.secondAvailable ?? BigInt.zero));
      final price = fiatConversionStore.prices[curr] ?? 0;
      ret += double.tryParse(calculateFiatAmount(
                  price: price, cryptoAmount: curr.formatAmount(available).replaceAll(",", ""))
              .replaceAll(",", "")) ??
          0;
    }
    return ret.toStringAsFixed(2);
  }

  Balance _currencyBalance(CryptoCurrency cryptoCurrency) {
    final balance = wallet.balance[cryptoCurrency];

    if (balance == null) throw Exception('No balance for ${wallet.currency}');

    return balance;
  }

  @observable
  bool isShowCard;

  ReactionDisposer? _onCurrentWalletChangeReaction;

  @action
  void _onWalletChange(
      WalletBase<Balance, TransactionHistoryBase<TransactionInfo>, TransactionInfo>? wallet) {
    if (wallet == null) return;

    this.wallet = wallet;
    _onCurrentWalletChangeReaction?.reaction.dispose();
    isShowCard = wallet.walletInfo.isShowIntroCakePayCard;
  }

  @action
  Future<void> disableIntroCakePayCard() async {
    const cardDisplayStatus = false;
    wallet.walletInfo.showIntroCakePayCard = cardDisplayStatus;
    await wallet.walletInfo.save();
    isShowCard = cardDisplayStatus;
  }

  @action
  void switchBalanceValue() {
    if (settingsStore.balanceDisplayMode == BalanceDisplayMode.displayableBalance) {
      settingsStore.balanceDisplayMode = BalanceDisplayMode.hiddenBalance;
      settingsStore.balanceHideCounter++;
    } else {
      settingsStore.balanceDisplayMode = BalanceDisplayMode.displayableBalance;
    }
  }

  String _getFiatBalance({required double price, String? cryptoAmount}) {
    if (cryptoAmount == null || cryptoAmount.isEmpty || double.tryParse(cryptoAmount) == null) {
      return '0.00'.withLocalSeperator(settingsStore.languageCode);
    }

    return calculateFiatAmount(price: price, cryptoAmount: cryptoAmount)
        .withLocalSeperator(settingsStore.languageCode);
  }

  String _formatterAsset(CryptoCurrency asset) {
    return appStore.amountParsingProxy.getCryptoSymbol(asset);
  }
}