public char[] Process(char[] input)
{
var indexX = Array.IndexOf(input, X);
var indexY = Array.IndexOf(input, Y);
return(PositionSwap.SwapPositions(input, indexX, indexY));
}
private static List <IInstruction> GetInstructions(IEnumerable <string> instructionLines)
{
var instructions = new List <IInstruction>();
IInstruction instruction;
foreach (var instructionLine in instructionLines)
{
instruction = null;
var parts = GetParts(instructionLine);
if (parts[0] == "swap")
{
if (parts[1] == "position")
{
instruction = new PositionSwap()
{
IndexX = int.Parse(parts[2]),
IndexY = int.Parse(parts[5])
};
}
else
{
instruction = new LetterSwap()
{
X = parts[2][0],
Y = parts[5][0]
};
}
}
else if (parts[0] == "rotate")
{
if (parts[1] == "based")
{
instruction = new RotatePos()
{
X = parts[6][0]
};
}
else
{
instruction = new Rotate()
{
Count = int.Parse(parts[2]) * (parts[1] == "right" ? -1 : 1)
};
}
}
else if (parts[0] == "reverse")
{
instruction = new Reverse()
{
IndexX = int.Parse(parts[2]),
IndexY = int.Parse(parts[4])
};
}
else if (parts[0] == "move")
{
instruction = new Move()
{
IndexX = int.Parse(parts[2]),
IndexY = int.Parse(parts[5])
};
}
if (instruction == null)
{
throw new InvalidOperationException();
}
instructions.Add(instruction);
}
return(instructions);
}
