/// <summary>
/// Overload + operator to properly calculate cent overflow
/// </summary>
/// <param name="addition1">First amount</param>
/// <param name="addition2">Second amount</param>
/// <returns>Calculated result</returns>
public static Money operator +(Money addition1, Money addition2)
{
var result = new Money();
result.Euros = addition1.Euros + addition2.Euros;
result.Cents = addition1.Cents + addition2.Cents;
if (result.Cents >= 100)
{
result.Euros += 1;
result.Cents = 100 - result.Cents;
}
return result;
}
/// <summary>
/// Simple validation for coin values. Assuming coints are inserted one by one
/// </summary>
/// <param name="money">Added amount of money</param>
/// <returns>True coin is supported</returns>
public static Boolean ValidateInsertedCoin(Money money)
{
if (money.Euros > 0)
{
return SupportedEuroCoins.Contains(money.Euros);
}
else if (money.Cents > 0)
{
return SupportedCentCoins.Contains(money.Cents);
}
else
{
throw new Exception("Invalid money amout");
}
}
/// <summary>
/// Overload - operator to properly calculate cent overflow
/// </summary>
/// <param name="substraction1">First element</param>
/// <param name="substraction2">Second element</param>
/// <returns>Calculated result</returns>
public static Money operator -(Money substraction1, Money substraction2)
{
var result = new Money();
result.Euros = substraction1.Euros - substraction2.Euros;
result.Cents = substraction1.Cents - substraction2.Cents;
if (result.Cents < 0)
{
result.Euros -= 1;
result.Cents = 100 + result.Cents;
}
if (result.Euros < 0)
{
throw new ArgumentOutOfRangeException("Not enough money on balance");
}
return result;
}
/// <summary>
/// Substract amount from buffered account
/// </summary>
/// <param name="money">Amount to substract</param>
public void SubstractBufferedAmount(Money money)
{
_bufferedAccount -= money;
}
/// <summary>
/// Inserting coints to the machine. Saving them in order buffer
/// </summary>
/// <param name="amount">Amount of coins inserted</param>
/// <returns></returns>
public Money InsertCoin(Money amount)
{
if (!MoneyHelper.ValidateInsertedCoin(amount))
{
throw new ArgumentException("Coin not supported");
}
var _backedBuffer = _moneyHolder.GetBufferedAmount();
try
{
_moneyHolder.AddBufferedAmount(amount);
return _moneyHolder.GetBufferedAmount();
}
catch (Exception ex)
{
// in case of calculation failed revert buffer to previous state
// and throw exception
_moneyHolder.SetBuffedAmount(_backedBuffer);
throw ex;
}
}
/// <summary>
/// Substract amount from account
/// </summary>
/// <param name="money">Amount to substract</param>
public void SubstractAccounterAmount(Money money)
{
_account -= money;
}
/// <summary>
/// Sets buffered amount of money
/// </summary>
/// <param name="amount">Amount to set</param>
public void SetBuffedAmount(Money amount)
{
_bufferedAccount = amount;
}
/// <summary>
/// Sets accounted money
/// </summary>
/// <param name="amount">Amount to set</param>
public void SetAccountedAmount(Money amount)
{
_account = amount;
}
/// <summary>
/// Add amount to buffered account
/// </summary>
/// <param name="money">Amount to add</param>
public void AddBufferedAmount(Money money)
{
_bufferedAccount += money;
}
/// <summary>
/// Add amount of money to the account
/// </summary>
/// <param name="money">Money to add</param>
public void AddAccountedAmount(Money money)
{
_account += money;
}