/**
  * ExaminationOOP
  * Classe per illustrare la progettazione orientata agli oggetti
  *
  * @author A.Luchetta
  * @version 7-Nov-2007
  * @see Student.java
  * @see Examination.java
*/

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

public class ExaminationOOP
{
   public static void main(String[] args)
   {
      Student[] students = new Student[10];
      int studentsSize = 0;

      Scanner in = new Scanner(System.in);

      boolean done = false;
      while (!done)
      { 
         Student s = readStudent(in);
         if (s == null)
            done = true;
         else
         {
            if (studentsSize >= students.length)
               students = resize(students, 2 * studentsSize);
            
            students[studentsSize] = s;
            studentsSize++;
         }
      }
      
      done = false;
      while (!done)
      {
         System.out.print("Comando? ");
         int command = in.nextInt();
         if (command == 0)
            done = true;
         else if (command == 1)
         {
            System.out.print("nome? ");
            String name = in.next();
            printAverage(students, name, studentsSize);
          }
         else
            System.out.println("Comando errato");
      }
   }

   /*
      Acquisisce uno studente da flusso di dati
      ritorna null se il flusso di dati e’ terminato
   */
   private static Student readStudent(Scanner input)
   {
      final String END_OF_DATA = "";

      String line = END_OF_DATA;
      if (input.hasNextLine())
         line = input.nextLine();

      if (line.equalsIgnoreCase(END_OF_DATA))
         return null;
      
      Scanner st = new Scanner(line);
      st.useLocale(Locale.US);

      String nameTmp = st.next();
      double wMarkTmp = st.nextDouble();
      double oMarkTmp = st.nextDouble();

      return new Student(nameTmp, wMarkTmp, oMarkTmp);
   }
   
   /* Stampa la media di uno studente
      @param students l’array di studenti
      @param name nome dello studente
      @param size numero degli studenti
   */
   private static void printAverage(Student[] students, String name, int size)
   {
      int i = findName(students, name, size);
 
     //gestione dell'errore con lancio di eccezione
      if (i == -1)
         throw new NoSuchElementException("studente non trovato");
      
      double avg = (students[i].getWMark() + students[i].getOMark()) / 2;
      System.out.println(name + " " + avg + "\n");
   }
   
   /* Trova l’indice dell’array corrispondente a uno studente
      @param students l’array di studenti
      @param name nome dello studente
      @param count numero degli studenti
      @return l’indice se lo studente e’ presente, -1 altrimenti
   */
   private static int findName(Student[] students, String name, int size)
   {
      for (int i = 0; i < size; i++)
      if (students[i].getName().equals(name))
         return i;

      return -1;
   }
   
   /* il solito metodo resize()… */
   private static Student[] resize(Student[] oldArray, int newLength)
   {
      int n = oldArray.length < newLength ? oldArray.length : newLength;

      Student[] newArray = new Student[n];
      for (int i = 0; i < n; i++)
         newArray[i] = oldArray[i];
      
      return newArray;
   }
} // fine della classe ExaminationtOOP