package com.zetcode.service;

import com.opencsv.bean.CsvToBean;

import com.opencsv.bean.CsvToBeanBuilder;

import com.opencsv.bean.HeaderColumnNameMappingStrategy;

import com.zetcode.bean.Country;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.nio.charset.StandardCharsets;

import java.util.List;

import java.util.Optional;

public class CountryService {

public static Optional<List<Country>> getListOfCountries() throws IOException {

List<Country> countries;

try (InputStream is = CountryService.class.getClassLoader()

.getResourceAsStream("countries.csv")) {

if (is == null) {

return Optional.empty();

}

HeaderColumnNameMappingStrategy<Country> strategy

= new HeaderColumnNameMappingStrategy<>();

strategy.setType(Country.class);

try (var br = new BufferedReader(

new InputStreamReader(is, StandardCharsets.UTF_8))) {

CsvToBean<Country> csvToBean = new CsvToBeanBuilder<Country>(br)

.withType(Country.class)

.withMappingStrategy(strategy)

.withIgnoreLeadingWhiteSpace(true)

.build();

countries = csvToBean.parse();

}

// try (CSVReader reader = new CSVReader(new InputStreamReader(is))) {

//

// String[] nextLine;

// reader.readNext();

//

// while ((nextLine = reader.readNext()) != null) {

//

// var newCountry = new Country(nextLine[0],

// Integer.parseInt(nextLine[1]));

// countries.add(newCountry);

// }

// }

}

return Optional.of(countries);

}

}