public decimal CalculateExchange(ExchangeInput exchangeInput)
{
var rateFrom = _rates.Where(x => x.Name.Equals(exchangeInput.From)).Select(x => x.Rate).FirstOrDefault();
var rateTo = (decimal)_rates.Where(x => x.Name.Equals(exchangeInput.To)).Select(x => x.Rate).FirstOrDefault();
var result = (decimal)(1.0 / rateFrom) * exchangeInput.Value * rateTo;
return(result);
}
public IActionResult CalculateExchange([FromBody] ExchangeInput exchange)
{
if (!ModelState.IsValid)
{
return(BadRequest(ModelState));
}
ExchangeMath math = new ExchangeMath(_repository.GetTodaysRates());
var result = math.CalculateExchange(exchange);
return(Json(math.GetDecimalFormattedString(result, 2)));
}
public ActionResult Index(ExchangeInput input)
{
// Validate Input
ValidateInput(input);
// Set Tracked currencies for rendering in View
ViewData["TrackedCurrencies"] = (IEnumerable <string>) this.HttpContext.Application["TrackedCurrencies"];
// Render Index view with input
return(View("Index", input));
}
/// <summary>
/// Render Chart
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public ActionResult Chart(ExchangeInput input)
{
// Initialize empty data
IEnumerable <ExchangeRate> data = new ExchangeRate[0];
// Get data from repository and intialize necessary param for Rendering
if (input != null)
{
// Get data from repository
data = _exchangeRateRepository.GetExchangeRates(input.TargetCurrency, input.StartDate, input.EndDate);
// Set param for rendering
ViewBag.Currency = input.TargetCurrency;
ViewBag.From = input.StartDate;
ViewBag.To = input.EndDate;
}
// Render view
return(View(data));
}
/// <summary>
/// Explicitly validate Exhcange Input
/// </summary>
/// <param name="input"></param>
private void ValidateInput(ExchangeInput input)
{
// If no start date selected
if (input.StartDate == null)
{
ModelState.AddModelError("StartDate", "Please select a Start date");
}
// If no end date selected
if (input.EndDate == null)
{
ModelState.AddModelError("EndDate", "Please select a End date");
}
if (input.StartDate != null && input.EndDate != null)
{
// Max expected end date
var expectedEndDate = input.StartDate.AddMonths(2);
// Invalid date range
if (input.EndDate < input.StartDate)
{
ModelState.AddModelError("DateRange", "Invalid Range of Start date and End date. End date should not earlier than Start date");
}
else if (input.EndDate > expectedEndDate)
{
ModelState.AddModelError("DateRange", "Invalid Range of Start date and End date. Range should not exceed 2 months");
}
// Invalid start date
if (input.StartDate < new DateTime(1999, 1, 1))
{
ModelState.AddModelError("InvalidStartDate", "StartDate must be later than 1/1/1999");
}
else if (input.StartDate > DateTime.Now)
{
ModelState.AddModelError("InvalidStartDate", "No data found");
}
}
}
