public async Task <IActionResult> GetExchangeRates([FromQuery] ExchangeRatesQueryInputModel queryInputModel)
{
try
{
//Validate model
if (!ModelState.IsValid)
{
return(StatusCode(StatusCodes.Status400BadRequest, ModelState.Values.SelectMany(x => x.Errors)));
}
//Map from query string values and split the values
var inputModel = _helper.Mapper(queryInputModel);
//validate if date input are correct
if (inputModel.ExchangeRatesDates.Count < 2)
{
ModelState.AddModelError(nameof(inputModel.ExchangeRatesDates), "ExchangeRatesDates must have at least two date values");
return(StatusCode(StatusCodes.Status400BadRequest, ModelState.Values.SelectMany(x => x.Errors)));
}
//Order the input into asc order
inputModel = _helper.OrderInputDates(inputModel);
//Get the end point
var endPointUrl = _helper.GetEndPointUrl("history", inputModel.BaseCurrency, inputModel.TargetCurrency, inputModel.ExchangeRatesDates.First().ExchangeRatesDate, inputModel.ExchangeRatesDates.Last().ExchangeRatesDate);
//Create http client
var client = _clientFactory.CreateClient("ExchangeRates");
//Make a request and get response
var apiResponse = await client.GetAsync(endPointUrl);
//Validate the response
if (apiResponse.IsSuccessStatusCode)
{
var responseString = await apiResponse.Content.ReadAsStringAsync();
//If empty response then return no content
if (responseString.Length <= 0)
{
return(StatusCode(StatusCodes.Status204NoContent));
}
//Parse the json api response into class model
var exchangeRatesHistoryResult = _helper.ParseExchangeRatesHistory(responseString, inputModel);
//Create the response that we want to return
var response = _helper.CreateExchangeRatesResponse(exchangeRatesHistoryResult);
//return the response
return(StatusCode(StatusCodes.Status200OK, response));
}
//If not valid response , return the error
return(StatusCode((int)apiResponse.StatusCode, apiResponse.ReasonPhrase));
}
catch (Exception ex)
{
//return if any exception
return(StatusCode(StatusCodes.Status500InternalServerError, ex.Message));
}
}
/// <summary>
/// Map and convert comma seprated values into dates
/// </summary>
/// <param name="fromModel"></param>
/// <returns></returns>
public ExchangeRatesInputModel Mapper(ExchangeRatesQueryInputModel fromModel)
{
var toModel = new ExchangeRatesInputModel
{
BaseCurrency = fromModel.BaseCurrency,
TargetCurrency = fromModel.TargetCurrency
};
var splitExchangeRatesDates = fromModel.ExchangeRatesDates.Split(",");
foreach (var ratesDate in splitExchangeRatesDates)
{
if (DateTime.TryParse(ratesDate, out DateTime ratesDateResult))
{
toModel.ExchangeRatesDates.Add(new ExchangeRatesDatesInputModel
{
ExchangeRatesDate = ratesDateResult
});
}
}
return(toModel);
}