import 'package:flutter/foundation.dart';

import 'package:pshared/controllers/balance_mask/wallets.dart';
import 'package:pshared/models/money.dart';
import 'package:pshared/models/payment/payment.dart';
import 'package:pshared/models/payment/quote/status_type.dart';
import 'package:pshared/models/payment/wallet.dart';

import 'package:pweb/models/payment/multiple_payouts/csv_row.dart';
import 'package:pweb/models/payment/multiple_payouts/state.dart';
import 'package:pweb/providers/multiple_payouts.dart';
import 'package:pweb/services/payments/csv_input.dart';


class MultiplePayoutsController extends ChangeNotifier {
  final CsvInputService _csvInput;
  MultiplePayoutsProvider? _provider;
  WalletsController? _wallets;
  _PickState _pickState = _PickState.idle;
  Exception? _uiError;

  MultiplePayoutsController({
    required CsvInputService csvInput,
  }) : _csvInput = csvInput;

  void update(MultiplePayoutsProvider provider, WalletsController wallets) {
    var shouldNotify = false;
    if (!identical(_provider, provider)) {
      _provider?.removeListener(_onProviderChanged);
      _provider = provider;
      _provider?.addListener(_onProviderChanged);
      shouldNotify = true;
    }
    if (!identical(_wallets, wallets)) {
      _wallets?.removeListener(_onWalletsChanged);
      _wallets = wallets;
      _wallets?.addListener(_onWalletsChanged);
      shouldNotify = true;
    }
    if (shouldNotify) {
      notifyListeners();
    }
  }

  MultiplePayoutsState get state =>
      _provider?.state ?? MultiplePayoutsState.idle;
  String? get selectedFileName => _provider?.selectedFileName;
  List<CsvPayoutRow> get rows => _provider?.rows ?? const <CsvPayoutRow>[];
  int get sentCount => _provider?.sentCount ?? 0;
  Exception? get error => _uiError ?? _provider?.error;

  bool get isQuoting => _provider?.isQuoting ?? false;
  bool get isSending => _provider?.isSending ?? false;
  bool get isBusy => _provider?.isBusy ?? false;

  bool get quoteIsLoading => _provider?.quoteIsLoading ?? false;
  QuoteStatusType get quoteStatusType =>
      _provider?.quoteStatusType ?? QuoteStatusType.missing;
  Duration? get quoteTimeLeft => _provider?.quoteTimeLeft;

  bool get canSend => _provider?.canSend ?? false;
  Money? get aggregateDebitAmount =>
      _provider?.aggregateDebitAmountFor(_selectedWallet);
  Money? get requestedSentAmount => _provider?.requestedSentAmount;
  Money? get aggregateSettlementAmount =>
      _provider?.aggregateSettlementAmountFor(_selectedWallet);
  Money? get aggregateFeeAmount =>
      _provider?.aggregateFeeAmountFor(_selectedWallet);
  double? get aggregateFeePercent =>
      _provider?.aggregateFeePercentFor(_selectedWallet);

  Future<void> pickAndQuote() async {
    if (_pickState == _PickState.picking) return;
    final provider = _provider;
    if (provider == null) {
      _setUiError(StateError('Multiple payouts provider is not ready'));
      return;
    }

    _clearUiError();
    _pickState = _PickState.picking;
    try {
      final picked = await _csvInput.pickCsv();
      if (picked == null) return;
      final wallet = _selectedWallet;
      if (wallet == null) {
        _setUiError(StateError('Select source wallet first'));
        return;
      }
      await provider.quoteFromCsv(
        fileName: picked.name,
        content: picked.content,
        sourceWallet: wallet,
      );
    } catch (e) {
      _setUiError(e);
    } finally {
      _pickState = _PickState.idle;
    }
  }

  Future<List<Payment>> send() async {
    return _provider?.send() ?? const <Payment>[];
  }

  Future<MultiplePayoutSendOutcome> sendAndGetOutcome() async {
    _clearUiError();
    final provider = _provider;
    if (provider == null) {
      _setUiError(StateError('Multiple payouts provider is not ready'));
      return MultiplePayoutSendOutcome.failure;
    }

    final payments = await provider.send();
    final hasError = provider.error != null;
    if (hasError || payments.isEmpty) {
      return MultiplePayoutSendOutcome.failure;
    }
    return MultiplePayoutSendOutcome.success;
  }

  void removeUploadedFile() {
    _provider?.removeUploadedFile();
    _clearUiError(notify: false);
  }

  void _onProviderChanged() {
    notifyListeners();
  }

  void _onWalletsChanged() {
    notifyListeners();
  }

  Wallet? get _selectedWallet => _wallets?.selectedWallet;

  void _setUiError(Object error) {
    _uiError = error is Exception ? error : Exception(error.toString());
    notifyListeners();
  }

  void _clearUiError({bool notify = true}) {
    if (_uiError == null) return;
    _uiError = null;
    if (notify) {
      notifyListeners();
    }
  }

  @override
  void dispose() {
    _provider?.removeListener(_onProviderChanged);
    _wallets?.removeListener(_onWalletsChanged);
    super.dispose();
  }
}

enum _PickState { idle, picking }

enum MultiplePayoutSendOutcome { success, failure }