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using System.Diagnostics;
using System.Text;
using System.Xml.Linq;
namespace ExcelAddIn.Services;
public class CurrencyClient : ICurrencyClient
{
private readonly HttpClient _httpClient;
private const string _requestAddress = @"https://www.cbr.ru/scripts/XML_daily.asp?date_req=";
public CurrencyClient(HttpClient httpClient)
{
_httpClient = httpClient;
}
public async Task<decimal?> GetExchangeRate(DateTime date)
{
string request = $"{_requestAddress}{date.Date:dd/MM/yyyy}";
HttpResponseMessage response = await _httpClient.GetAsync(request);
try
{
response.EnsureSuccessStatusCode();
var bytes = await response.Content.ReadAsByteArrayAsync();
var xml = Encoding.GetEncoding(1251).GetString(bytes);
XElement valCourses = XElement.Parse(xml);
decimal? exchangeRate = decimal.Parse(valCourses.Elements("Valute")
.Where(e => e.Element("Name").Value == "Евро")
.FirstOrDefault()
.Element("Value").Value);
return exchangeRate;
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
return null;
}
}
}
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