import 'package:cake_wallet/entities/fiat_api_mode.dart';
import 'package:cw_bitcoin/bitcoin_amount_format.dart';
import 'package:cw_core/monero_amount_format.dart';
import 'package:cw_core/wallet_base.dart';
import 'package:cw_core/transaction_info.dart';
import 'package:cw_core/wallet_type.dart';
import 'package:cake_wallet/src/screens/transaction_details/standart_list_item.dart';
import 'package:cake_wallet/src/screens/transaction_details/textfield_list_item.dart';
import 'package:cake_wallet/src/screens/transaction_details/transaction_details_list_item.dart';
import 'package:cake_wallet/src/screens/transaction_details/blockexplorer_list_item.dart';
import 'package:cw_core/transaction_direction.dart';
import 'package:cake_wallet/utils/date_formatter.dart';
import 'package:cake_wallet/entities/transaction_description.dart';
import 'package:hive/hive.dart';
import 'package:mobx/mobx.dart';
import 'package:cake_wallet/store/settings_store.dart';
import 'package:cake_wallet/generated/i18n.dart';
import 'package:url_launcher/url_launcher.dart';
import 'package:cake_wallet/monero/monero.dart';
import 'package:cake_wallet/core/fiat_conversion_service.dart';

part 'transaction_details_view_model.g.dart';

class TransactionDetailsViewModel = TransactionDetailsViewModelBase
    with _$TransactionDetailsViewModel;

abstract class TransactionDetailsViewModelBase with Store {
  TransactionDetailsViewModelBase(
      {required this.transactionInfo,
      required this.transactionDescriptionBox,
      required this.wallet,
      required this.settingsStore})
      : items = ObservableList<TransactionDetailsListItem>(),
      isRecipientAddressShown = false,
      showRecipientAddress = settingsStore.shouldSaveRecipientAddress,
        fiatRateListItem = StandartListItem(
            title: S.current.historical_fiat_rate,
            value: '${S.current.fetching.toLowerCase()} ...') {
    final dateFormat = DateFormatter.withCurrentLocal();
    final tx = transactionInfo;

    if (wallet.type == WalletType.monero) {
      final key = tx.additionalInfo['key'] as String?;
      final accountIndex = tx.additionalInfo['accountIndex'] as int;
      final addressIndex = tx.additionalInfo['addressIndex'] as int;
      final feeFormatted = tx.feeFormatted();
      final _items = [
        StandartListItem(
            title: S.current.transaction_details_transaction_id, value: tx.id),
        StandartListItem(
            title: S.current.transaction_details_date,
            value: dateFormat.format(tx.date)),
        StandartListItem(
            title: S.current.transaction_details_height, value: '${tx.height}'),
        StandartListItem(
            title: S.current.transaction_details_amount,
            value: tx.amountFormatted()),
        if (feeFormatted != null)
          StandartListItem(
            title: S.current.transaction_details_fee, value: feeFormatted),
        if (settingsStore.fiatApiMode != FiatApiMode.disabled &&
            settingsStore.showHistoricalFiatRate)
        fiatRateListItem,
        if (key?.isNotEmpty ?? false)
          StandartListItem(title: S.current.transaction_key, value: key!)
      ];

      if (tx.direction == TransactionDirection.incoming &&
          accountIndex != null &&
          addressIndex != null) {
        try {
          final address = monero!.getTransactionAddress(wallet, accountIndex, addressIndex);
          final label = monero!.getSubaddressLabel(wallet, accountIndex, addressIndex);

          if (address?.isNotEmpty ?? false) {
            isRecipientAddressShown = true;
            _items.add(
                StandartListItem(
                    title: S.current.transaction_details_recipient_address,
                    value: address));
          }

          if (label?.isNotEmpty ?? false) {
            _items.add(
                StandartListItem(
                  title: S.current.address_label,
                  value: label)
            );
          }
        } catch (e) {
          print(e.toString());
        }
      }

      items.addAll(_items);
    }

    if (wallet.type == WalletType.bitcoin
        || wallet.type == WalletType.litecoin) {
      final _items = [
        StandartListItem(
            title: S.current.transaction_details_transaction_id, value: tx.id),
        StandartListItem(
            title: S.current.transaction_details_date,
            value: dateFormat.format(tx.date)),
        StandartListItem(
            title: S.current.confirmations,
            value: tx.confirmations.toString()),
        StandartListItem(
            title: S.current.transaction_details_height, value: '${tx.height}'),
        StandartListItem(
            title: S.current.transaction_details_amount,
            value: tx.amountFormatted()),
        if (tx.feeFormatted()?.isNotEmpty ?? false)
          StandartListItem(
              title: S.current.transaction_details_fee,
              value: tx.feeFormatted()!),
        if (settingsStore.fiatApiMode != FiatApiMode.disabled &&
            settingsStore.showHistoricalFiatRate)
          fiatRateListItem,
      ];

      items.addAll(_items);
    }

    if (wallet.type == WalletType.haven) {
      items.addAll([
        StandartListItem(
            title: S.current.transaction_details_transaction_id, value: tx.id),
        StandartListItem(
            title: S.current.transaction_details_date,
            value: dateFormat.format(tx.date)),
        StandartListItem(
            title: S.current.transaction_details_height, value: '${tx.height}'),
        StandartListItem(
            title: S.current.transaction_details_amount,
            value: tx.amountFormatted()),
        if (tx.feeFormatted()?.isNotEmpty ?? false)
          StandartListItem(
            title: S.current.transaction_details_fee, value: tx.feeFormatted()!),
        if (settingsStore.fiatApiMode != FiatApiMode.disabled &&
            settingsStore.showHistoricalFiatRate)
          fiatRateListItem,
      ]);
    }

    if (showRecipientAddress && !isRecipientAddressShown) {
      try {
        final recipientAddress = transactionDescriptionBox.values
            .firstWhere((val) => val.id == transactionInfo.id)
            .recipientAddress;

        if (recipientAddress?.isNotEmpty ?? false) {
          items.add(StandartListItem(
              title: S.current.transaction_details_recipient_address,
              value: recipientAddress!));
        }
      } catch(_) {
        // FIX-ME: Unhandled exception
      }
    }

    final type = wallet.type;

    items.add(BlockExplorerListItem(
        title: S.current.view_in_block_explorer,
        value: _explorerDescription(type),
        onTap: () {
          try {
            launch(_explorerUrl(type, tx.id));
          } catch (e) {}
        }));

    final description = transactionDescriptionBox.values.firstWhere(
        (val) => val.id == transactionInfo.id,
        orElse: () => TransactionDescription(id: transactionInfo.id));

    items.add(TextFieldListItem(
        title: S.current.note_tap_to_change,
        value: description.note,
        onSubmitted: (value) {
          description.transactionNote = value;

          if (description.isInBox) {
            description.save();
          } else {
            transactionDescriptionBox.add(description);
          }
        }));
    if (settingsStore.showHistoricalFiatRate) {
      getHistoricalFiatRate();
    }
  }

  final TransactionInfo transactionInfo;
  final Box<TransactionDescription> transactionDescriptionBox;
  final SettingsStore settingsStore;
  final WalletBase wallet;
  final StandartListItem fiatRateListItem;

  final ObservableList<TransactionDetailsListItem> items;
  bool showRecipientAddress;
  bool isRecipientAddressShown;

  @action
  Future<void> getHistoricalFiatRate() async {
    final fiatRateItemIndex = items.indexWhere((element) => element == fiatRateListItem);
    if (fiatRateItemIndex == -1) return;

    final fiat = settingsStore.fiatCurrency;

    final historicalFiatRate = await FiatConversionService.fetchHistoricalPrice(
        crypto: wallet.currency,
        fiat: fiat,
        torOnly: settingsStore.fiatApiMode == FiatApiMode.torOnly,
        date: transactionInfo.date);
    var formattedFiatAmount = 0.0;
    switch (wallet.type) {
      case WalletType.bitcoin:
      case WalletType.litecoin:
        formattedFiatAmount = bitcoinAmountToDouble(amount: transactionInfo.amount);
        break;
      case WalletType.monero:
      case WalletType.haven:
        formattedFiatAmount = moneroAmountToDouble(amount: transactionInfo.amount);
        break;
      default:
        formattedFiatAmount;
    }

    final historicalFiatAmountFormatted = formattedFiatAmount * historicalFiatRate;
    items[fiatRateItemIndex] = StandartListItem(
        title: S.current.historical_fiat_rate,
        value: historicalFiatAmountFormatted > 0.0
            ? historicalFiatAmountFormatted.toStringAsFixed(2) + ' ${fiat}'
            : 'no historical data');
  }

  String _explorerUrl(WalletType type, String txId) {
    switch (type) {
      case WalletType.monero:
        return 'https://monero.com/tx/${txId}';
      case WalletType.bitcoin:
        return 'https://mempool.space/tx/${txId}';
      case WalletType.litecoin:
        return 'https://blockchair.com/litecoin/transaction/${txId}';
      case WalletType.haven:
        return 'https://explorer.havenprotocol.org/search?value=${txId}';
      default:
        return '';
    }
  }

  String _explorerDescription(WalletType type) {
    switch (type) {
      case WalletType.monero:
        return S.current.view_transaction_on + 'Monero.com';
      case WalletType.bitcoin:
        return S.current.view_transaction_on + 'mempool.space';
      case WalletType.litecoin:
        return S.current.view_transaction_on + 'Blockchair.com';
      case WalletType.haven:
        return S.current.view_transaction_on + 'explorer.havenprotocol.org';
      default:
        return '';
    }
  }
}