using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace RhSolutions.Services;

public class CurrencyClient : ICurrencyClient
{
    private readonly HttpClient _httpClient; 
    public HttpStatusCode StatusCode { get; private set; }

    public CurrencyClient(IServiceProvider serviceProvider)
    {
        _httpClient = serviceProvider.GetRequiredService<HttpClient>();
    }

    public async Task<decimal?> GetCurrencyCourse(DateTime date)
    {
        string request = $"https://www.cbr.ru/scripts/XML_daily.asp?date_req={date.Date.ToString("dd/MM/yyyy")}";
        var response = await _httpClient.GetAsync(request);

        try
        {
            response.EnsureSuccessStatusCode();
            string xml = await response.Content.ReadAsStringAsync();
            XElement valCourses = XElement.Parse(xml);
            var course = decimal.Parse(valCourses.Elements("Valute")
                .Where(e => e.Element("Name").Value == "Евро")
                .FirstOrDefault()
                .Element("Value").Value);
            return course;
        }
        catch
        {
            StatusCode = response.StatusCode;
        }

        return null;
    }
}