public static string IsLegalMovement(PlayerMove currentMove, Board i_Board)
{
bool isValidMovement = true;
Square sourceSquare;
Square destinationSquare;
char currentUserCoinType;
char otherUserCoinType;
bool tryingToJump;
Coin[,] boardArray = i_Board.BoardArray;
sourceSquare = currentMove.CurrentSquare;
destinationSquare = currentMove.NextSquare;
string errorMessage = string.Empty;
if (!movementIndexesInRange(currentMove, i_Board.BoardSize))
{
isValidMovement = false;
errorMessage = ErrorMessageGenerator.OutOfBoundMessage();
}
else
{
Coin currentCoin = boardArray[sourceSquare.RowIndex, sourceSquare.ColumnIndex];
if (i_Board.IsEmptyAtSquare(sourceSquare))
{
isValidMovement = false;
errorMessage = ErrorMessageGenerator.NoCoinToMoveMessage();
}
if (isValidMovement)
{
currentUserCoinType = currentCoin.Type;
otherUserCoinType = currentUserCoinType == Constants.k_FirstCoinType ? Constants.k_SecondCoinType : Constants.k_FirstCoinType;
if (!currentCoin.Type.Equals(currentUserCoinType))
{
isValidMovement = false;
errorMessage = ErrorMessageGenerator.NoCoinToMoveMessage();
}
else if (currentCoin.IsKing)
{
tryingToJump = KingValidation.isTryingToJump_King(currentMove);
if (tryingToJump)
{
isValidMovement = IsValidJump(currentMove, otherUserCoinType, i_Board);
if (!isValidMovement)
{
errorMessage = ErrorMessageGenerator.InvalidJumpMessage();
}
}
else
{
if (!i_Board.IsEmptyAtSquare(destinationSquare))
{
isValidMovement = false;
errorMessage = ErrorMessageGenerator.SquareIsBlockedMessage();
}
else
{
isValidMovement = KingValidation.isDiagonal_King(currentMove);
if (!isValidMovement)
{
errorMessage = ErrorMessageGenerator.NotDiagonalMessage();
}
}
}
}
else if (IsTryingToJump(currentMove, Convert.ToString(currentUserCoinType)))
{
if (!IsValidJump(currentMove, otherUserCoinType, i_Board))
{
errorMessage = ErrorMessageGenerator.InvalidJumpMessage();
}
}
else if (!i_Board.IsEmptyAtSquare(destinationSquare))
{
isValidMovement = false;
errorMessage = ErrorMessageGenerator.SquareIsBlockedMessage();
}
else if (!IsDiagonal(currentMove, currentUserCoinType))
{
isValidMovement = false;
errorMessage = ErrorMessageGenerator.NotDiagonalMessage();
}
}
}
return(errorMessage);
}