import java.util.*;
import java.io.*;

public class ReadWithScannerAndWriteCSV {


  public static void main(String []args) {
  
    TelephoneNumber[] numbers;
    numbers = readTelephoneNumbers("telephone-list.txt");
    printTelephoneNumbers(numbers);
    writeTelephoneNumbers2CSVfile(numbers, "contacts.csv");
  }
  
  public static void printTelephoneNumbers(TelephoneNumber[] numbers) {
    for(TelephoneNumber number : numbers) {
      System.out.println(number);
    }
  }
  
  public static TelephoneNumber[] readTelephoneNumbers(String filename) {
    String firstname, lastname;
    
    long number;
    int i=0;
    TelephoneNumber numbers[] = new TelephoneNumber[5];
    try(Scanner sc = new Scanner(new File(filename))) {
      
      while( sc.hasNext() ) {        
        firstname = sc.next();
        lastname = sc.next();
        number = sc.nextLong();

        numbers[i++] = new TelephoneNumber(firstname+" "+lastname, number);
      }
      
    } catch(InputMismatchException ex) {
      System.out.println("Invalid file contents!");
    } catch(FileNotFoundException ex) {
      System.out.println("Unable to open '"+filename+"'");
    }
    
    return numbers;
  }
  
  public static void writeTelephoneNumbers2CSVfile(TelephoneNumber[] numbers, String filename) {
    
    try(PrintWriter writer = new PrintWriter(filename)) {
      for(TelephoneNumber number : numbers) {
        writer.format("%d, %s\n", number.getNumber(), number.getName());
      }
    }
    catch(FileNotFoundException ex) {
      System.out.format("Unable to open file '%s' for writting!\n", filename);
    }
    
  }
}