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sub build_list_of_names
{
    @my_list = ();
    my $name;
    open(FILE, "< name.txt") or die "Couldn't open file";
    while (chomp($name = <FILE>))
    {
        push @my_list,$name;
    }
    close(FILE);
}

sub get_user_option
{
    print("\n1.Serch for customer\n");
    print("2. Add new customer\n");
    print("3. Get all customer\n");
    print("4. Quit\n");

    print("\nSelect an option: ");
    chomp($option_selected = <STDIN>);
    return $option_selected;
}

sub get_customers
{
    print("\nCustomers:\n\n");
    my $count = 0;
    foreach $name_of_customer (@my_list)
    {
        $count += 1;
        print("$count. $name_of_customer\n");
    }
}

sub search_for_customer
{
    print("\nEnter name of customer: ");
    chomp($name_of_customer = <STDIN>);
    foreach $name(@my_list)
    {
        if ( lc($name_of_custmer) eq lc($name) )
        {
            print("\n$name was found.\n");
            return;
        }
    }
} 

sub add_new_customer
{
    print("\nEnter name of new customer: ");
    chomp($the_new_customer = <STDIN>);
    $exit_status = push(@my_list, $the_new_customer);
    if($exit_status) { print("\nNew customer added.\n");}
    else{ print("\nSomthing went wrong!");}
}



&build_list_of_names();
$option_selected = &get_user_option();
while ($option_selected != 4)
{
    if ($option_selected == 1)
    {
        &search_for_customer();
        $option_selected = &get_user_option();
    }
    elsif ($option_selected == 2)
    {
        &add_new_customer();
        $option_selected = &get_user_option();
    }
    elsif ($option_selected == 3)
    {
        &get_customers();
        $option_selected = &get_user_option();
    }
    else
    {
        print("\nPlease select a valid option!\n");
        $option_selected = &get_user_option();
    }
}

open(FILE, "> name.txt");
foreach $name (@my_list)
{
    chomp($name);
    print(FILE "$name\n");
}
close(FILE);

print("\nExisting...\n");
exit;