static void Main(string[] args)
{
const string filename = "contacts.csv";
bool run = true;
while (run)
{
Console.WriteLine("Choose a function by number: ");
Console.WriteLine("1 - Add contact");
Console.WriteLine("2 - Delete contact");
Console.WriteLine("3 - Update contact information");
Console.WriteLine("4 - View all contacts");
bool correctInput = int.TryParse(Console.ReadLine(), out int choiceInput);
if (!correctInput || !(choiceInput < 5 && choiceInput > 0))
{
Console.WriteLine("Error. Incorrect input. Please exit application and try again.");
break;
}
run = false;
switch (choiceInput)
{
case 1:
Console.Clear();
Console.WriteLine("ADD CONTACT");
Console.WriteLine("A contact format has to be: \"First_Name, Last_Name, Phone_Number, Address\". Address field is optional.");
string contactInput = Console.ReadLine();
TaskUtils.AddAndSave(filename, contactInput);
BackProcess(ref run);
break;
case 2:
Console.Clear();
Console.WriteLine("REMOVE CONTACT");
InOut.PrintAllContacts("Type a phone number of a contact to be removed.");
string deleteByNumber = Console.ReadLine();
TaskUtils.RemoveContact(deleteByNumber, filename);
BackProcess(ref run);
break;
case 3:
Console.Clear();
Console.WriteLine("UPDATE CONTACT");
InOut.PrintAllContacts("Type a number of a contact to be updated.");
bool contactIndex = int.TryParse(Console.ReadLine(), out int index);
if (!contactIndex)
{
Console.WriteLine("Error. Incorrect input.");
BackProcess(ref run);
break;
}
TaskUtils.UpdateContact(index, filename);
BackProcess(ref run);
break;
case 4:
Console.Clear();
Console.WriteLine("VIEW ALL CONTACTS");
InOut.PrintAllContacts("");
BackProcess(ref run);
break;
}
}
Console.ReadKey();
}