public static bool IsValid(this IBoardingPass boardingPass)
{
if (boardingPass == null)
{
throw new ArgumentNullException(nameof(boardingPass));
}
return(IsValidSeat(boardingPass.Seat));
}
public static int Row(this IBoardingPass boardingPass)
{
if (boardingPass == null)
{
throw new ArgumentNullException(nameof(boardingPass));
}
if (boardingPass.IsValid() == false)
{
throw new ArgumentException(nameof(boardingPass));
}
return(CalculateRowPosition(boardingPass));
}
public static int SeatId(this IBoardingPass boardingPass)
{
if (boardingPass == null)
{
throw new ArgumentNullException(nameof(boardingPass));
}
if (boardingPass.IsValid() == false)
{
throw new ArgumentException(nameof(boardingPass));
}
// (row x 8) + col
return((Row(boardingPass) * 8) + Column(boardingPass));
}
private static int CalculateRowPosition(IBoardingPass boardingPass)
{
var rowString = RowStringFromSeat(boardingPass.Seat);
var rowIndexMin = _rowIndexMin;
var rowIndexMax = _rowIndexMax;
foreach (var rowChar in rowString)
{
if (rowChar == 'B')
{
BinarySpacePartitioning(ref rowIndexMin, ref rowIndexMax, BinarySpacePartitioningAction.Up);
}
if (rowChar == 'F')
{
BinarySpacePartitioning(ref rowIndexMin, ref rowIndexMax, BinarySpacePartitioningAction.Down);
}
}
return(rowIndexMin); // min and max should be equal at this point.
}
private static int CalculateColumnPosition(IBoardingPass boardingPass)
{
var colString = ColStringFromSeat(boardingPass.Seat);
var colIndexMin = _colIndexMin;
var colIndexMax = _colIndexMax;
foreach (var colChar in colString)
{
if (colChar == 'R')
{
BinarySpacePartitioning(ref colIndexMin, ref colIndexMax, BinarySpacePartitioningAction.Up);
}
if (colChar == 'L')
{
BinarySpacePartitioning(ref colIndexMin, ref colIndexMax, BinarySpacePartitioningAction.Down);
}
}
return(colIndexMin); // min and max should be equal at this point.
}