/// <summary>
/// Checks wether number is owned by other contacts or not
/// </summary>
/// <param name="number"></param>
/// <returns></returns>
public static bool CheckIfNumberAlreadyExists(string number)
{
List <Contact> contacts = InOut.GetAllContacts();
int quantity = (from contact in contacts where contact.PhoneNumber.Equals(number) select contact).Count();
return(quantity < 1 ? false : true);
}
/// <summary>
/// Lets get the specific line from a data file and update it
/// </summary>
/// <param name="index"></param>
/// <param name="filename"></param>
public static void UpdateContact(int index, string filename)
{
if (InOut.GetAllContacts().Count != 0)
{
string[] lines = File.ReadAllLines(filename);
if (index - 1 > lines.Length || index - 1 < 0)
{
Console.WriteLine("Incorrect input. A contact with this typed number does not exists.");
return;
}
Console.WriteLine("Retype updated contact in format \"First_Name, Last_Name, Phone_Number, Address\"");
try
{
string updateContact = Console.ReadLine();
string[] values = updateContact.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
string phoneNumber = values[2];
if (lines[index - 1].Contains(phoneNumber))
{
lines[index - 1] = updateContact;
File.WriteAllLines(filename, lines);
Console.WriteLine("A contact was successfully updated.");
}
else
{
if (CheckIfNumberAlreadyExists(phoneNumber))
{
Console.WriteLine("A contact with same phone number already exists.");
return;
}
else
{
lines[index - 1] = updateContact;
File.WriteAllLines(filename, lines);
}
}
}
catch (Exception)
{
Console.WriteLine("Error. Incorrect input.");
}
}
}
/// <summary>
/// Removes a contact by specific property
/// </summary>
/// <param name="number"></param>
/// <param name="filename"></param>
public static void RemoveContact(string number, string filename)
{
if (InOut.GetAllContacts().Count != 0)
{
if (number.Equals(""))
{
Console.WriteLine("Error. Incorrect input.");
return;
}
int linesLenghtBefore = InOut.GetAllContacts().Count;
string[] lines = File.ReadAllLines(filename).Where(line => !line.Contains(number)).ToArray();
if (linesLenghtBefore > lines.Length)
{
File.WriteAllLines(filename, lines);
Console.WriteLine("A contact was successfully deleted.");
}
else
{
Console.WriteLine("A contact with typed number does not exists.");
}
}
}
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();
}