public async Task <Result <Purse> > ConvertMoneyAsync(string userid, string fromcurrency, decimal cashvalue,
string tocurrency)
{
tocurrency = tocurrency?.ToUpper();
fromcurrency = fromcurrency?.ToUpper();
var purseResult = await _purseManager.GetPurseAsync(userid);
if (purseResult.Status != ResultEnum.Success)
{
return(purseResult);
}
if (cashvalue <= 0)
{
return(new Result <Purse>(ResultEnum.Error, purseResult.Value, "Invalid cashvalue"));
}
var checkCurrency = await _currencyConverter.CheckCurrency(tocurrency);
if (!checkCurrency)
{
return(new Result <Purse>(ResultEnum.Error, purseResult.Value, "Сonvertible currency not found in DB"));
}
var fromBill = purseResult.Value.Bills.SingleOrDefault(from => from.CurrencyName == fromcurrency);
if (fromBill != null)
{
if (fromBill.Cash < cashvalue)
{
return(new Result <Purse>(ResultEnum.Error, purseResult.Value, "Not enough money for convertation"));
}
var cashToAdd = await _currencyConverter.GetConvertCashAsync(fromcurrency, cashvalue, tocurrency);
if (cashToAdd <= 0)
{
return(new Result <Purse>(ResultEnum.Error, purseResult.Value, "Error convertation"));
}
fromBill.Cash -= cashvalue;
if (purseResult.Value.Bills.Exists(bill => bill.CurrencyName == tocurrency))
{
purseResult.Value.Bills.Single(bill => bill.CurrencyName == tocurrency).Cash += cashToAdd;
}
else
{
purseResult.Value.Bills.Add(
new Bill
{
CurrencyName = tocurrency, PurseId = userid, Cash = cashToAdd
});
}
await _dbContext.SaveChangesAsync();
return(new Result <Purse>(ResultEnum.Success, purseResult.Value, string.Empty));
}
else
{
return(new Result <Purse>(ResultEnum.Error, purseResult.Value, "Invalid bill for convertation"));
}
}