import 'package:flutter/material.dart';

import 'package:collection/collection.dart';

import 'package:uuid/uuid.dart';

import 'package:pshared/api/requests/payment/quote.dart';
import 'package:pshared/data/mapper/payment/intent/payment.dart';
import 'package:pshared/models/asset.dart';
import 'package:pshared/models/payment/currency_pair.dart';
import 'package:pshared/models/payment/customer.dart';
import 'package:pshared/models/payment/fx/intent.dart';
import 'package:pshared/models/payment/fx/side.dart';
import 'package:pshared/models/payment/kind.dart';
import 'package:pshared/models/payment/methods/managed_wallet.dart';
import 'package:pshared/models/payment/methods/type.dart';
import 'package:pshared/models/payment/money.dart';
import 'package:pshared/models/payment/settlement_mode.dart';
import 'package:pshared/models/payment/intent.dart';
import 'package:pshared/models/payment/quote.dart';
import 'package:pshared/models/recipient/recipient.dart';
import 'package:pshared/provider/organizations.dart';
import 'package:pshared/provider/payment/amount.dart';
import 'package:pshared/provider/payment/flow.dart';
import 'package:pshared/provider/payment/wallets.dart';
import 'package:pshared/provider/recipient/provider.dart';
import 'package:pshared/provider/recipient/pmethods.dart';
import 'package:pshared/provider/resource.dart';
import 'package:pshared/service/payment/quotation.dart';
import 'package:pshared/utils/currency.dart';


class QuotationProvider extends ChangeNotifier {
  Resource<PaymentQuote> _quotation = Resource(data: null, isLoading: false, error: null);
  late OrganizationsProvider _organizations;
  bool _isLoaded = false;

  void update(
    OrganizationsProvider venue, 
    PaymentAmountProvider payment,
    WalletsProvider wallets,
    PaymentFlowProvider flow,
    RecipientsProvider recipients,
    PaymentMethodsProvider methods,
  ) {
    _organizations = venue;
    final t = flow.selectedType;
    final method = methods.methods.firstWhereOrNull((m) => m.type == t);
    if ((wallets.selectedWallet != null) && (method != null)) {
      final customer = _buildCustomer(
        recipient: recipients.currentObject,
        method: method,
      );
      getQuotation(PaymentIntent(
        kind: PaymentKind.payout,
        amount: Money(
          amount: payment.amount.toString(), 
          // TODO: adapt to possible other sources
          currency: currencyCodeToString(wallets.selectedWallet!.currency),
        ),
        destination: method.data,
        source: ManagedWalletPaymentMethod(
          managedWalletRef: wallets.selectedWallet!.id,
        ),
        fx: FxIntent(
          pair: CurrencyPair(
            base: currencyCodeToString(wallets.selectedWallet!.currency), 
            quote: 'RUB', // TODO: exentd target currencies
          ),
          side: FxSide.sellBaseBuyQuote,
        ),
        settlementMode: payment.payerCoversFee ? SettlementMode.fixReceived : SettlementMode.fixSource,
        customer: customer,
      ));
    }
  }

  PaymentQuote? get quotation => _quotation.data;

  bool get isReady => _isLoaded && !_quotation.isLoading && _quotation.error == null;

  Asset? get fee => quotation == null ? null : createAsset(quotation!.expectedFeeTotal!.currency, quotation!.expectedFeeTotal!.amount);
  Asset? get total => quotation == null ? null : createAsset(quotation!.debitAmount!.currency, quotation!.debitAmount!.amount);
  Asset? get recipientGets => quotation == null ? null : createAsset(quotation!.expectedSettlementAmount!.currency, quotation!.expectedSettlementAmount!.amount);

  void _setResource(Resource<PaymentQuote> quotation) {
    _quotation = quotation;
    notifyListeners();
  }

  Future<PaymentQuote?> getQuotation(PaymentIntent intent) async {
    if (!_organizations.isOrganizationSet) throw StateError('Organization is not set');
    try {
      _quotation = _quotation.copyWith(isLoading: true, error: null);
      final response = await QuotationService.getQuotation(
        _organizations.current.id, 
        QuotePaymentRequest(
          idempotencyKey: Uuid().v4(),
          intent: intent.toDTO(),
        ),
      );
      _isLoaded = true;
      _setResource(_quotation.copyWith(data: response, isLoading: false, error: null));
    } catch (e) {
      _setResource(_quotation.copyWith(
        data: null,
        error: e is Exception ? e : Exception(e.toString()),
        isLoading: false,
      ));
    }
    notifyListeners();
    return _quotation.data;
  }

  void reset() {
    _setResource(Resource(data: null, isLoading: false, error: null));
    _isLoaded = false;
    notifyListeners();
  }
}

Customer? _buildCustomer({
  required Recipient? recipient,
  required PaymentMethod method,
}) {
  final recipientId = (recipient?.id ?? method.recipientRef).trim();
  if (recipientId.isEmpty) {
    return null;
  }

  var firstName = '';
  var lastName = '';
  final cardData = method.cardData;
  if (cardData != null) {
    firstName = cardData.firstName.trim();
    lastName = cardData.lastName.trim();
  }

  if ((firstName.isEmpty || lastName.isEmpty) && recipient != null) {
    final parts = recipient.name.trim().split(RegExp(r'\s+'));
    if (parts.isNotEmpty && firstName.isEmpty) {
      firstName = parts.first;
    }
    if (parts.length > 1 && lastName.isEmpty) {
      lastName = parts.sublist(1).join(' ');
    }
  }

  if (lastName.isEmpty) {
    lastName = firstName;
  }

  return Customer(
    id: recipientId,
    firstName: firstName.isEmpty ? null : firstName,
    lastName: lastName.isEmpty ? null : lastName,
    country: cardData?.country,
  );
}