import 'dart:convert';
import 'dart:io';

import 'package:csv/csv.dart';
import 'package:equatable/equatable.dart';
import 'package:file_picker/file_picker.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:tunas/repositories/account/account_repository.dart';
import 'package:tunas/repositories/account/models/account.dart';
import 'package:tunas/repositories/account/models/category.dart';
import 'package:tunas/repositories/account/models/transaction.dart';
import 'package:uuid/uuid.dart';

part 'account_event.dart';
part 'account_state.dart';

final colors = [
  'FF74feff',
  'FF64c0ff',
  'FF5873fe',
  'FF4b4cff',
  'FFc0fcfd',
  'FFa7caff',
  'FF8d7efd',
  'FF7f65fe',
  'FFe7ffff',
  'FFd7dafd',
  'FFd8a6ff',
  'FFc065fe',
  'FFffffff',
  'FFffe6fe',
  'FFffbdff',
  'FFff80fe',
];

class AccountBloc extends Bloc<AccountEvent, AccountState> {
  final AccountRepository _accountRepository;

  AccountBloc({required AccountRepository accountRepository})
      : _accountRepository = accountRepository,
        super(const AccountState()) {
    on<AccountImportJSON>(_onAccountImportJSON);
    on<AccountImportCSV>(_onAccountImportCSV);
    on<SubAccountLoad>(_onSubAccountLoad);
    // on<AccountExportJSON>(_onAccountImportJSON);
    // on<AccountExportCSV>(_onAccountImportJSON);

    _accountRepository
      .getSubAccountsStream()
      .listen((subAccounts) => add(SubAccountLoad(subAccounts)));
  }

  double _universalConvertToDouble(dynamic value) {
    if (value is String) {
      return double.parse(value);
    } else if (value is int) {
      return value.toDouble();
    } else if (value is double) {
      return value;
    } else {
      throw Error();
    }
  }

  _onAccountImportCSV(
      AccountImportCSV event, Emitter<AccountState> emit) async {
    int colorIndex = 0;
    FilePickerResult? result = await FilePicker.platform.pickFiles();

    final csvPath = result?.files.first.path;
    if (csvPath != null) {
      final File csv = File(csvPath);
      final String csvFileContent = await csv.readAsString();
      final List<List<dynamic>> csvList = const CsvToListConverter(fieldDelimiter: '|', eol: '\n').convert(csvFileContent);

      final Map<String, Category> categoriesMap = {};
      final Set<String> subAccounts = {};

      final transactions = csvList
        .map((line) {
          
          String? categoryLabel = line[1];
          if (categoryLabel == null || categoryLabel == '') {
            categoryLabel = 'N/A';
          }

          if (categoriesMap[categoryLabel] == null) {
            if (categoryLabel == 'N/A') {
              categoriesMap[categoryLabel] = Category(label: 'N/A', color: 'FFFF0000' );
            } else {
              String color = colorIndex >= colors.length ? 'FF0000FF' : colors[colorIndex];
              colorIndex++;
              categoriesMap[categoryLabel] = Category(label: categoryLabel, color: color );
            }
          }

          subAccounts.add(line[3]);

          return Transaction(
            uuid: const Uuid().v8(),
            date: DateTime.parse(line[0]),
            category: categoryLabel,
            description: line[2],
            account: line[3],
            value: _universalConvertToDouble(line[4]));
          })
        .toList();

      await _accountRepository.deleteAccount();
      final account = Account(transactions: transactions, categories: categoriesMap.values.toList(), subAccounts: subAccounts);
      await _accountRepository.saveAccount(account);
    }
  }

  _onAccountImportJSON(
      AccountImportJSON event, Emitter<AccountState> emit) async {
    FilePickerResult? result = await FilePicker.platform.pickFiles();

    final jsonPath = result?.files.first.path;
    if (jsonPath != null) {
      final File json = File(jsonPath);
      final String jsonString = await json.readAsString();
      final List<dynamic> jsonList = jsonDecode(jsonString);
      final List<Transaction> transactions = jsonList.map((transaction) => Transaction.fromJson(transaction)).toList();

      await _accountRepository.deleteAccount();
      await _accountRepository.saveTransactions(transactions);
    }
  }

  _onSubAccountLoad(
    SubAccountLoad event, Emitter<AccountState> emit
  ) {
    emit(
      state.copyWith(event.subAccounts)
    );
  }
}