/**
  * Examination
  * Classe per illustrare la progettazione orientata agli oggetti
  * La classe usa una struttura dati ad array paralleli
  * si sconsiglia l'uso di array paralleli
  * si veda la lezione relativa
  *
  * @author A.Luchetta
  * @version 7-Nov-2007
  * @see Student.java
  * @see ExaminationOOP.java
*/

import java.util.Scanner;
import java.util.Locale;
import java.util.NoSuchElementException;

public class Examination
{
   public static void main(String[] args)
   {
      final String END_OF_DATA = "";

      String line = END_OF_DATA;
      String[] names  = new String[10]; // array paralleli
      double[] wMarks = new double[10];
      double[] oMarks = new double[10];
      int size = 0; // array riempiti solo in parte

      Scanner in = new Scanner(System.in);
      boolean done = false;
      while (!done)
      {
         if (in.hasNextLine()) line = in.nextLine();
         if (line.equalsIgnoreCase(END_OF_DATA))
            done = true;
         else
         {
            if (size >= names.length)
            {
               names  = resize(names,  size * 2);
               wMarks = resize(wMarks, size * 2);
               oMarks = resize(oMarks, size * 2);
            }
            Scanner st = new Scanner(line);
            st.useLocale(Locale.US);
            names[size] = st.next();
            wMarks[size] = st.nextDouble();
            oMarks[size] = st.nextDouble();
            size++;
         }
      }

      done = false;
      while (!done)
      {
         System.out.print("Comando: \n- 0 termina il"
            + " programma \n- 1 calcola la media \ncomando? ");
         int command = in.nextInt();
         if (command == 0)
            done = true;
         else if (command == 1)
         {
            System.out.print("nome?: ");
            String name = in.next();
            printAverage(names, wMarks, oMarks, name, size);
         }
         else
            System.out.println("Comando errato");
      }
   }

   private static void printAverage (String[] names, double[] wMarks, double[] oMarks,
      String name, int count)
   {
       int i = findName(names, name, count);
       if (i == -1)
          throw new NoSuchElementException("studente non trovato");
       else
       {
          double avg = (wMarks[i] + oMarks[i]) / 2;
          System.out.println(name + " " + avg);
       }
   }

   private static int findName(String[] names, String name, int count)
   {
      for (int i = 0; i < count; i++)
         if (names[i].equals(name))
            return i;
      return -1;
   }

   /* il solito metodo resize()… */
   private static String[] resize(String[] oldArray, int newLength)
   {
      int n = oldArray.length < newLength ?
      oldArray.length : newLength;
      String[] newArray = new String[n];
      for (int i = 0; i < n; i++)
         newArray[i] = oldArray[i];
      return newArray;
   }

   /* un altro solito metodo resize()… */
   private static double[] resize(double[] oldArray, int newLength)
   {
      int n = oldArray.length < newLength ? oldArray.length : newLength;
      double[] newArray = new double[n];
      for (int i = 0; i < n; i++)
         newArray[i] = oldArray[i];
      return newArray;
   }
}