namespace ConsoleApp1;

using System.Text;

public class Task18
{
    public void Run()
    {
        Console.InputEncoding = Encoding.Unicode;
        Console.OutputEncoding = Encoding.Unicode;

        char openingBracket = '(';
        char closingBracket = ')';

        bool canExit = false;

        while ( canExit == false )
        {
            Console.Clear();

            Console.WriteLine("Input text with brackets");
            string text = Console.ReadLine();

            int bracketsAccumulator = 0;
            int maximumNestingDepth = 0;
            bool isTextCorrect = true;
            int firstUnexpectedClosingBracketIndex = -1;

            for ( var index = 0; index < text.Length; index++ )
            {
                var symbol = text[index];

                if ( symbol == openingBracket )
                {
                    bracketsAccumulator++;
                }
                else if ( symbol == closingBracket )
                {
                    bracketsAccumulator--;
                }

                maximumNestingDepth = Math.Max( bracketsAccumulator, maximumNestingDepth );

                if ( isTextCorrect && bracketsAccumulator < 0 )
                {
                    isTextCorrect = false;
                    firstUnexpectedClosingBracketIndex = index;
                }
            }

            if ( isTextCorrect && bracketsAccumulator != 0 )
            {
                isTextCorrect = false;
            }

            if ( isTextCorrect )
            {
                Console.WriteLine($"Text is correct, maximum nesting depth = {maximumNestingDepth}");
            }
            else if( firstUnexpectedClosingBracketIndex != -1 )
            {
                Console.WriteLine( $"Text is not valid, maximum nesting depth = {maximumNestingDepth}, has unexpected close bracket, index = {firstUnexpectedClosingBracketIndex}" );
            }
            else
            {
                Console.WriteLine( $"Text is not valid, maximum nesting depth = {maximumNestingDepth}, missing closing bracket" );
            }

            Console.WriteLine();

            string properlyExitAnswer = "n";
            Console.WriteLine( $"Continue? Enter \'{properlyExitAnswer}\' for exit" );
            string continueAnswer = Console.ReadLine();

            canExit = string.Equals( continueAnswer, properlyExitAnswer );
        }
    }
}