StringView.cs

using System;
using StringProcessingApp.Services;

namespace StringProcessingApp.Views
{
    public class StringView
    {
        private StringService _service;

        public StringView()
        {
            _service = new StringService();
        }

        public void Run()
        {
            bool exit = false;
            while (!exit)
            {
                DisplayMenu();
                Console.Write("Choose an option: ");
                string input = Console.ReadLine();
                Console.WriteLine();

                switch (input)
                {
                    case "1":
                        EnterText();
                        break;
                    case "2":
                        ViewCurrentText();
                        break;
                    case "3":
                        Console.WriteLine("Uppercase: " + _service.ToUpperCase());
                        break;
                    case "4":
                        Console.WriteLine("Lowercase: " + _service.ToLowerCase());
                        break;
                    case "5":
                        Console.WriteLine("Character count: " + _service.CountCharacters());
                        break;
                    case "6":
                        CheckContainsWord();
                        break;
                    case "7":
                        ReplaceWord();
                        break;
                    case "8":
                        ExtractSubstring();
                        break;
                    case "9":
                        Console.WriteLine("Trimmed text: " + _service.TrimSpaces());
                        break;
                    case "10":
                        _service.ResetText();
                        Console.WriteLine("Text reset to original.");
                        break;
                    case "11":
                        exit = true;
                        Console.WriteLine("Exiting...");
                        break;
                    default:
                        Console.WriteLine("Invalid option. Try again.");
                        break;
                }

                Console.WriteLine();
            }
        }

        private void DisplayMenu()
        {
            Console.WriteLine("=== String Processing System ===");
            Console.WriteLine("1. Enter Text");
            Console.WriteLine("2. View Current Text");
            Console.WriteLine("3. Convert to UPPERCASE");
            Console.WriteLine("4. Convert to lowercase");
            Console.WriteLine("5. Count Characters");
            Console.WriteLine("6. Check if Contains Word");
            Console.WriteLine("7. Replace Word");
            Console.WriteLine("8. Extract Substring");
            Console.WriteLine("9. Trim Spaces");
            Console.WriteLine("10. Reset Text");
            Console.WriteLine("11. Exit");
            Console.WriteLine("================================");
        }

        private void EnterText()
        {
            Console.Write("Enter your text: ");
            string text = Console.ReadLine();
            _service.SetText(text);
            Console.WriteLine("Text saved successfully.");
        }

        private void ViewCurrentText()
        {
            string text = _service.GetText();
            Console.WriteLine("Current Text: " + (string.IsNullOrEmpty(text) ? "[Empty]" : text));
        }

        private void CheckContainsWord()
        {
            Console.Write("Enter word to check: ");
            string word = Console.ReadLine();
            bool exists = _service.ContainsWord(word);
            Console.WriteLine(exists ? $"Text contains '{word}'." : $"Text does not contain '{word}'.");
        }

        private void ReplaceWord()
        {
            Console.Write("Enter word to replace: ");
            string oldWord = Console.ReadLine();
            Console.Write("Enter new word: ");
            string newWord = Console.ReadLine();
            string result = _service.ReplaceWord(oldWord, newWord);
            Console.WriteLine("Updated Text: " + result);
        }

        private void ExtractSubstring()
        {
            Console.Write("Enter start index: ");
            if (!int.TryParse(Console.ReadLine(), out int start))
            {
                Console.WriteLine("Invalid input.");
                return;
            }

            Console.Write("Enter length: ");
            if (!int.TryParse(Console.ReadLine(), out int length))
            {
                Console.WriteLine("Invalid input.");
                return;
            }

            string substring = _service.ExtractSubstring(start, length);
            Console.WriteLine("Substring: " + substring);
        }
    }
}