/// <summary>
/// Load data about currency exchange rates
/// </summary>
/// <param name="fiatCurrencyEnum">Fiat currency enum</param>
/// <returns>Objects that contains data about currency rates</returns>
public FiatCurrencyModel RecieveDataAboutFiatCurreny(FiatCurrencyEnum fiatCurrencyEnum)
{
dataCache = new DataToFileCache <FiatCurrencyModel>();
cachedFiatCurrencyModel = new FiatCurrencyModel()
{
Date = new DateTime(1970, 1, 1)
}; //To check if something was possible to load
string fileName = fiatCurrencyEnum.ToString() + ".txt";
if (dataCache.DataIsCached(fileName))
{
cachedFiatCurrencyModel = dataCache.LoadCachedData(fileName);
var currentTicks = DateTime.Now.AddDays(-2).Ticks;
if (cachedFiatCurrencyModel.Date.Ticks > currentTicks)
{
return(cachedFiatCurrencyModel);
}
else
{
return(TryLoadDataFromApi(fiatCurrencyEnum));
}
}
else
{
return(TryLoadDataFromApi(fiatCurrencyEnum));
}
}
private double ConvertCurrency(FiatCurrencyEnum from, double userInputAmount, FiatCurrencyEnum to)
{
return(to switch
{
FiatCurrencyEnum.EUR => userInputAmount *double.Parse(fiatCurrencyModel.Rates.EUR, CultureInfo.InvariantCulture),
FiatCurrencyEnum.USD => userInputAmount *double.Parse(fiatCurrencyModel.Rates.USD, CultureInfo.InvariantCulture),
FiatCurrencyEnum.GBP => userInputAmount *double.Parse(fiatCurrencyModel.Rates.GBP, CultureInfo.InvariantCulture),
_ => 1.0d,
});
private FiatCurrencyModel TryLoadDataFromApi(FiatCurrencyEnum fiatCurrencyEnum)
{
try
{
cachedFiatCurrencyModel = fiatDataLoader.LoadDataAboutFiatCurrency(fiatCurrencyEnum).Result;
dataCache.SaveDataToCache(cachedFiatCurrencyModel, fiatCurrencyEnum.ToString() + ".txt");
return(cachedFiatCurrencyModel);
}
catch
{
return(cachedFiatCurrencyModel);
}
}
private void fiatCurrancyConvertButton_Click(object sender, RoutedEventArgs e)
{
ClearErrorFields();
if (ValidateInput() == false)
{
return;
}
FiatCurrencyEnum fromEnum = (FiatCurrencyEnum)fiatCurrancyFromComboBox.SelectedIndex;
FiatCurrencyEnum toEnum = (FiatCurrencyEnum)fiatCurrancyToComboBox.SelectedIndex;
var inputText = fiatCurrancyTextBox.Text;
LoadAndDisplayDataAboutFiatCurrencyAsync(fromEnum, toEnum, inputText);
}
private void LoadAndDisplayDataAboutFiatCurrency(FiatCurrencyEnum fromEnum, FiatCurrencyEnum toEnum, string inputText)
{
if (fromEnum.ToString().Equals(toEnum.ToString()))
{
Dispatcher.Invoke(() => fiatCurrancyResultTextBlock.Text = $"{double.Parse(inputText):N} {fromEnum} = {double.Parse(inputText):N} {toEnum}");
}
else
{
Dispatcher.Invoke(() =>
{
loadingIndicator.Visibility = Visibility.Visible;
cryptoCurrancyConvertButton.Content = "";
});
fiatCurrencyModel = _uiDataProvider.RecieveDataAboutFiatCurreny(fromEnum);
if (fiatCurrencyModel.Date == new DateTime(1970, 1, 1))
{
Dispatcher.Invoke(() =>
{
addtionalFiatInformationTextBlock.Text = $"Unable to load data\nCheck your internet connection\nor try again later";
fiatCurrancyResultTextBlock.Text = "";
addtionalFiatInformationTextBlock.Foreground = Brushes.Red;
});
}
else
{
var userInputAmount = double.Parse(inputText, CultureInfo.InvariantCulture);
var convertionResult = ConvertCurrency(fromEnum, userInputAmount, toEnum);
Dispatcher.Invoke(() =>
{
fiatCurrancyResultTextBlock.Text = $"{userInputAmount:N} {fromEnum} = {convertionResult:N} {toEnum}";
addtionalFiatInformationTextBlock.Text = "Information for " + fiatCurrencyModel.Date.ToString("dd/MM/yyyy");
addtionalFiatInformationTextBlock.Foreground = Brushes.Orange;
});
}
Dispatcher.Invoke(() =>
{
loadingIndicator.Visibility = Visibility.Hidden;
cryptoCurrancyConvertButton.Content = "Convert";
});
}
}
public async Task <FiatCurrencyModel> LoadDataAboutFiatCurrency(FiatCurrencyEnum baseCurrency)
{
string url = urlBase + "base=" + baseCurrency.ToString().Trim();
using (HttpResponseMessage response = await httpClient.GetAsync(url))
{
if (response.IsSuccessStatusCode)
{
var data = response.Content.ReadAsStringAsync().Result;
var convertedData = JsonConvert.DeserializeObject <FiatCurrencyModel>(data);
return(convertedData);
}
else
{
throw new Exception(response.ReasonPhrase);
}
}
}
private void LoadAndDisplayDataAboutFiatCurrencyAsync(FiatCurrencyEnum fromEnum, FiatCurrencyEnum toEnum, string inputText)
{
Task.Run(() => LoadAndDisplayDataAboutFiatCurrency(fromEnum, toEnum, inputText));
}
