using System.Globalization;

class Program
{
    // Main Method
    // Main or main
    static void Main(string[] args)
    {

        bool continueNewContact = true;

        while (continueNewContact)
        {


            try
            {
                Console.WriteLine("Enter your first name: ");
                string firstName = Console.ReadLine(); // declaration and assignment

                Console.WriteLine("Enter your last name: ");
                string lastName = Console.ReadLine();

                // Call GETFULLNAME and assign to a local variable in Main
                string fullName; // declaration
                fullName = GetFullName(firstName, lastName); // assignment

                // Output the full name to the terminal
                Console.WriteLine($"New contact fullname: {fullName}");
                Console.WriteLine("New contact fullname: " + fullName);

                // Append the new line of data to the log file

                LogDetails(firstName, lastName, fullName);

                // Ask the user if they want to add a new contact

                Console.WriteLine("Do you want to add another contact? (yes/no) ");
                string i_answer = Console.ReadLine().ToLower();

                if (i_answer != "yes") // yes, YES, Yes
                {

                continueNewContact = false; 
                
                } // if

            } // try
            catch (Exception)
            {
                Console.WriteLine("An error occurred.");

            } // catch

        } // while

        Console.WriteLine("Thank you for using application.");
    
    } // Main 

    // Get Full Name Method DEFINE
    static string GetFullName(string firstName, string lastName)
    {
        return $"{firstName} {lastName}"; // string interpolation with template variables
    
    } // GetFullName

    // Log Details Method
    // page 553 file I/O
    static void LogDetails(string firstName, string lastName, string fullName)
    {

        try
        {
            // Capture the current Environment Path
            string folderPath = Path.Combine(
                Environment.GetFolderPath(
                    Environment.SpecialFolder.MyDocuments
                    ), // GetFolderPath
                "LogFiles" ); // Combine

            // Handle the exception if the "LogFiles" folder does not exist in "My Documents"
            Directory.CreateDirectory( folderPath );

            // Create the log file name as log_MMddyyyy.txt
            string fileName = $"log_{DateTime.Now:MMddyyyy}.txt";

            // Create the full absolute file path or relative path
            string filePath = Path.Combine( folderPath, fileName );
            // C:\Users\Administrator\Documents\LogFiles\log_07112024.txt

            // Capture the current date time as string to add to the row of data for the new contact
            string creationDate = DateTime.Now.ToString("MM-dd-yyyy HH:mm:ss");

            // Line Output
            // firstName, lastName, creationDate
            // Bob, Smith, Bob Smith, 07-11-2024 01:56:52 PM
            string content = $"{firstName}, {lastName}, {fullName},{creationDate} {Environment.NewLine}";

            
            // Append the line to the txt file
            File.AppendAllText( filePath, content);

            // confirmation
            Console.WriteLine($"Data added to file {fileName}.");

        } // try

        catch (IOException ex)
        {
            Console.WriteLine($"Error Message: {ex.Message}");
            
        } // catch

        catch (Exception ex)
        {
            Console.WriteLine($"Error Message: {ex.Message}");
        } // catch
    
    } // Log Details

    
} // class