using System;

namespace DesignPatterns.State {
	internal class ProcessingTransactionState : IState {
		public ProcessingTransactionState( IPosTerminal terminal ) {
			_terminal = terminal;
		}

		public void ProcessTransaction( ) {
			if ( (++_counter % 5) == 0 ) {
				_terminal.CurrentState = new TransactionRejectedState( _terminal );
			}
			else {
				_terminal.CurrentState = new TransactionApprovedState( _terminal );
			}
		}

		public void PrintReceipt( ) {
			Console.Out.WriteLine( "The transaction needs to be processed first" );
		}

		public void SwipeCard( string cardNumber ) {
			Console.Out.WriteLine( "You have already swiped a card" );
		}

		public void EnterAmount( double amount ) {
			Console.Out.WriteLine( "You have already entered an amount" );
		}

		public void EnterPin( string pin ) {
			Console.Out.WriteLine( "You have already entered a PIN" );
		}

		private readonly IPosTerminal _terminal;
		private static int _counter;
	}
}