private static string PerformDanceMove(string programs, IDanceMove danceMove)
{
switch (danceMove.Type)
{
case DanceMoveType.Spin:
SpinDanceMove spinDanceMove = (SpinDanceMove)danceMove;
return(string.Join(string.Empty, programs.Skip(programs.Length - spinDanceMove.X))
+ string.Join(string.Empty, programs.Take(programs.Length - spinDanceMove.X)));
case DanceMoveType.Exchange:
ExchangeDanceMove exchangeDanceMove = (ExchangeDanceMove)danceMove;
char a = programs[exchangeDanceMove.A];
char b = programs[exchangeDanceMove.B];
char[] exchangeChars = programs.ToCharArray();
exchangeChars[exchangeDanceMove.B] = a;
exchangeChars[exchangeDanceMove.A] = b;
return(string.Join(string.Empty, exchangeChars));
case DanceMoveType.Partner:
PartnerDanceMove partnerDanceMove = (PartnerDanceMove)danceMove;
int idxA = programs.IndexOf(partnerDanceMove.A);
int idxB = programs.IndexOf(partnerDanceMove.B);
char[] partnerChars = programs.ToCharArray();
partnerChars[idxA] = programs[idxB];
partnerChars[idxB] = programs[idxA];
return(string.Join(string.Empty, partnerChars));
default:
throw new ArgumentException();
}
}
private IDanceMove ParseMove(string move)
{
IDanceMove parsedMove = null;
switch (move[0])
{
case 's':
parsedMove = new Spin()
{
NumToMove = Int32.Parse(move.Substring(1))
};
break;
case 'x':
parsedMove = new Exchange()
{
PositionA = Int32.Parse(move.Substring(1,
move.IndexOf('/') - 1)),
PositionB = Int32.Parse(move.Substring(
move.IndexOf('/') + 1
))
};
break;
case 'p':
parsedMove = new Partner()
{
PositionA = move.Substring(1,
move.IndexOf('/') - 1),
PositionB = move.Substring(move.IndexOf('/') + 1)
};
break;
default:
throw new InvalidDataException("Dance move data is invalid.");
}
return(parsedMove);
}
