import 'package:hash_wallet/reactions/wallet_connect.dart';
import 'package:hash_wallet/evm/evm.dart';
import 'package:cw_core/cake_hive.dart';
import 'package:cw_core/crypto_currency.dart';
import 'package:cw_core/currency_for_wallet_type.dart';
import 'package:cw_core/erc20_token.dart';
import 'package:cw_core/spl_token.dart';
import 'package:cw_core/tron_token.dart';
import 'package:cw_core/wallet_base.dart';
import 'package:cw_core/wallet_info.dart';
import 'package:cw_core/wallet_type.dart';
import 'package:hive/hive.dart';

class TokenUtilities {
  static Future<List<Erc20Token>> loadAllUniqueEvmTokens() async {
    final allWi = await WalletInfo.getAll();
    final evmWallets = allWi.where(
      (w) => isEVMCompatibleChain(w.type),
    );

    final seen = <String>{};
    final unique = <Erc20Token>[];

    for (final wallet in evmWallets) {
      final chain = getTokenNameBasedOnWalletType(wallet.type);
      final box = await _openEvmTokensBoxFor(wallet);

      for (final t in box.values.where((t) => t.enabled)) {
        final key = '$chain|${t.contractAddress.toLowerCase()}';
        if (seen.add(key)) {
          unique.add(t);
        }
      }
    }

    return unique;
  }

  static Future<List<SPLToken>> loadAllUniqueSolTokens() async {
    return <SPLToken>[];
  }

  static Future<List<TronToken>> loadAllUniqueTronTokens() async {
    return <TronToken>[];
  }

  static List<Erc20Token> loadDefaultEvmTokensForSwap() {
    if (evm == null) return [];

    final tokens = <Erc20Token>[];
    final seen = <String>{};

    for (final chain in evm!.getAllChains()) {
      for (final token in evm!.getDefaultTokensByChainId(chain.chainId)) {
        final key = '${chain.chainId}|${token.contractAddress.toLowerCase()}';
        if (seen.add(key)) tokens.add(token);
      }
    }

    return tokens;
  }

  static List<SPLToken> loadDefaultSolTokensForSwap() => <SPLToken>[];

  static List<TronToken> loadDefaultTronTokensForSwap() => <TronToken>[];

  static Future<List<Erc20Token>> loadEvmTokensForSwap() async {
    final defaultTokens = loadDefaultEvmTokensForSwap();
    final userTokens = await loadAllUniqueEvmTokens();

    final seen = <String>{};
    final result = <Erc20Token>[];

    for (final t in [...defaultTokens, ...userTokens]) {
      final key = '${t.tag ?? 'ETH'}|${t.contractAddress.toLowerCase()}';
      if (seen.add(key)) result.add(t);
    }

    return result;
  }

  static Future<List<SPLToken>> loadSolTokensForSwap() async {
    final defaultTokens = loadDefaultSolTokensForSwap();
    final userTokens = await loadAllUniqueSolTokens();

    final seen = <String>{};
    final result = <SPLToken>[];

    for (final t in [...defaultTokens, ...userTokens]) {
      final key = t.mintAddress.toLowerCase();
      if (seen.add(key)) result.add(t);
    }

    return result;
  }

  static Future<List<TronToken>> loadTronTokensForSwap() async {
    final defaultTokens = loadDefaultTronTokensForSwap();
    final userTokens = await loadAllUniqueTronTokens();

    final seen = <String>{};
    final result = <TronToken>[];

    for (final t in [...defaultTokens, ...userTokens]) {
      final key = t.contractAddress.toLowerCase();
      if (seen.add(key)) result.add(t);
    }

    return result;
  }

  /// Finds a token by address across wallets depending on [walletType]
  /// - EVM chains: match by contractAddress
  static Future<CryptoCurrency?> findTokenByAddress({
    required WalletType walletType,
    required String address,
  }) async {
    if(address.isEmpty) return null;
    final lower = address.toLowerCase();
    switch (walletType) {
      case WalletType.ethereum:
      case WalletType.polygon:
      case WalletType.base:
      case WalletType.arbitrum:
      case WalletType.bsc:
        final tokens = await loadAllUniqueEvmTokens();
        for (final t in tokens) {
          if (t.contractAddress.toLowerCase() == lower) return t;
        }
        return null;
      default:
        return null;
    }
  }

  static Future<Box<Erc20Token>> _openEvmTokensBoxFor(WalletInfo walletInfo) async {
    final walletKey = walletInfo.name.replaceAll(' ', '_');
    final boxName = _getErc20TokensBoxName(walletKey, walletInfo.type);

    if (CakeHive.isBoxOpen(boxName)) {
      return CakeHive.box<Erc20Token>(boxName);
    }
    return CakeHive.openBox<Erc20Token>(boxName);
  }

  static String _getErc20TokensBoxName(String walletKey, WalletType walletType) {
    return switch (walletType) {
      WalletType.ethereum => '${walletKey}_${Erc20Token.ethereumBoxName}',
      WalletType.polygon => '${walletKey}_${Erc20Token.polygonBoxName}',
      WalletType.base => '${walletKey}_${Erc20Token.baseBoxName}',
      WalletType.arbitrum => '${walletKey}_${Erc20Token.arbitrumBoxName}',
      WalletType.bsc => '${walletKey}_${Erc20Token.bscBoxName}',
      _ => '${walletKey}_${Erc20Token.ethereumBoxName}',
    };
  }

  static Erc20Token? findErc20Token(CryptoCurrency currency, WalletBase wallet) {
    if (currency is Erc20Token) return currency;

    // More of a fallback for us
    for (final balanceCurrency in wallet.balance.keys) {
      if (balanceCurrency is Erc20Token && _matchesCurrency(balanceCurrency, currency)) {
        return balanceCurrency;
      }
    }

    return null;
  }

  static Erc20Token? findErc20TokenForSwap(CryptoCurrency currency) {
    if (currency is Erc20Token) return currency;

    for (final token in loadDefaultEvmTokensForSwap()) {
      if (_matchesCurrency(token, currency)) return token;
    }
    return null;
  }

  static bool isNativeToken(CryptoCurrency currency) {
    final title = currency.title.toLowerCase();
    final tag = currency.tag?.toLowerCase();

    return title == 'eth' ||
        title == 'ethereum' ||
        title == 'matic' ||
        title == 'polygon' ||
        title == 'base' ||
        title == 'arbitrum' ||
        title == 'bnb' ||
        title == 'bsc' ||
        title == 'avax' ||
        title == 'avalanche' ||
        tag == 'polygon' ||
        tag == 'bsc' ||
        tag == 'avalanche';
  }

  static int getChainId(CryptoCurrency currency) {
    final tag = currency.tag?.toUpperCase();
    final title = currency.title.toLowerCase();

    // Only check EVM registry for currencies that might be EVM-related
    final isPotentialEVM = isNativeToken(currency) ||
        (tag != null &&
            (tag == 'ETH' || tag == 'POL' || tag == 'BASE' || tag == 'ARB' || tag == 'BSC'));

    if (isPotentialEVM) {
      // Try by tag first if available (e.g., 'POL', 'BASE', 'ARB')
      if (tag != null) {
        final chainId = evm?.getChainIdByTag(tag);
        if (chainId != null) return chainId;
      }

      // Try by title (case-insensitive)
      final titleChainId = evm?.getChainIdByTitle(title);
      if (titleChainId != null) return titleChainId;
    }

    // Fallback to hardcoded values for chains not in registry yet
    // Avalanche C-Chain
    if (title == 'avalanche' || title == 'avax' || tag == 'AVALANCHE') {
      return 43114;
    }

    // Optimism
    if (title == 'optimism' || title == 'op' || tag == 'OPTIMISM') {
      return 10;
    }

    // Fantom Opera
    if (title == 'fantom' || title == 'ftm' || tag == 'FANTOM') {
      return 250;
    }

    // Default to Ethereum mainnet
    return 1;
  }

  static Future<List<CryptoCurrency>> getAvailableTokensForNetwork(
    WalletType network,
  ) async {
    final baseCurrency = walletTypeToCryptoCurrency(network);
    final allTokens = <CryptoCurrency>[baseCurrency];
    final addedAddresses = <String>{};

    // Handle EVM networks
    if (isEVMCompatibleChain(network)) {
      // First, collect all user tokens
      final userTokens = await _getUserTokensForNetwork(baseCurrency);
      for (final token in userTokens) {
        if (token is Erc20Token) {
          final address = token.contractAddress.toLowerCase();
          if (addedAddresses.add(address)) {
            allTokens.add(token);
          }
        }
      }

      // Then add tokens from CryptoCurrency.all that don't duplicate user tokens
      for (final currency in CryptoCurrency.all) {
        // Match by tag for POL/BASE, match by title==tag for ETH
        final matches = (baseCurrency.tag == null && baseCurrency.title == currency.tag) ||
            (baseCurrency.tag != null &&
                currency.tag?.toLowerCase() == baseCurrency.tag?.toLowerCase());

        if (matches) {
          if (currency is Erc20Token) {
            final address = currency.contractAddress.toLowerCase();
            if (addedAddresses.add(address)) {
              allTokens.add(currency);
            }
          } else if (!allTokens.any((t) => _matchesCurrency(t, currency))) {
            allTokens.add(currency);
          }
        }
      }
    }

    return allTokens;
  }

  static bool _matchesCurrency(CryptoCurrency a, CryptoCurrency b) {
    return a.title.toUpperCase() == b.title.toUpperCase() &&
        (a.tag?.toUpperCase() == b.tag?.toUpperCase());
  }

  static Future<List<CryptoCurrency>> _getUserTokensForNetwork(CryptoCurrency baseCurrency) async {
    final walletType = cryptoCurrencyOrTokenToWalletType(baseCurrency);
    if (walletType == null) return [];

    if (isEVMCompatibleChain(walletType)) {
      final tokens = await TokenUtilities.loadAllUniqueEvmTokens();

      return tokens.where((token) {
        if (baseCurrency.tag == null) return token.tag == baseCurrency.title;

        return token.tag?.toLowerCase() == baseCurrency.tag?.toLowerCase();
      }).toList();
    }

    return [];
  }
}