// File: Stud_tst.java
// Test student class

import java.io.*;

public class StudentTest {

static DataInputStream DataInput=new DataInputStream(System.in);

static char GetChoice(String OK)  throws java.io.IOException
{char Reply;
 do {
  Reply=Character.toUpperCase((char)System.in.read());
//  System.out.println("*** GOT "+Reply);
 } while (OK.indexOf(Reply,0)==-1);
 System.in.read();
//  System.out.println("*** HAVE "+Reply);
 return(Reply);
}

 static int ReadInt() throws java.io.IOException
 {int Total=0,Sign=1;
  int Digit;
  // Eat Blanks
  while ((Digit=System.in.read())<=32);
  // Check for - sign
  if (Digit=='-')
   Sign=-1;
  else if (Digit>='0' && Digit<='9')
   Total=Digit-48;
  else return(-1);
  Digit=System.in.read();
  while (Digit>='0' && Digit<='9') {
   Total=(Total*10)+Digit-48; 
   Digit=System.in.read();
  }
  return(Total*Sign);
 }

static char StudentMenu() throws java.io.IOException
{System.out.println( "\nSelect:");
 System.out.println( "\tA)dd Class");
 System.out.println( "\tC)hange Grade");
 System.out.println( "\tR)emove Class");
 System.out.println( "\tP)rint Student");
 System.out.println( "\tH)ours Completed");
 System.out.println( "\tS)tudent Name");
 System.out.println( "\tE)xit");
 return (GetChoice("ACRPHSE"));
}

static void SetStudentName(Student S) throws java.io.IOException
{String Name;
 System.out.print( "Enter Student Name >");
 System.out.flush();
 Name=DataInput.readLine();
 S.SetName(Name);
}

static void AddClass(Student S) throws java.io.IOException
{int Hours;
 char Grade;
 System.out.print( "#Hours? >");
 System.out.flush();
 Hours=ReadInt();
 System.out.print( "Grade? (A-D,F) >");
 System.out.flush();
 Grade=GetChoice("ABCDF");;
 S.AddClass(Hours,Grade);
}

static void ChangeClass(Student S) throws java.io.IOException
{int Hours;
 char OldGrade,NewGrade;
 System.out.print( "#Hours? >");
 System.out.flush();
 Hours=ReadInt();
 System.out.print( "Old Grade? (A-D,F) >");
 System.out.flush();
 OldGrade=GetChoice("ABCDF");
 System.out.print( "New Grade? (A-D,F) >");
 System.out.flush();
 NewGrade=GetChoice("ABCDF");;
 S.ChangeGrade(Hours,OldGrade,NewGrade);
}

static void RemoveClass(Student S) throws java.io.IOException
{int Hours;
 char Grade;
 System.out.print( "#Hours? >");
 System.out.flush();
 Hours=ReadInt();
 System.out.print( "Grade? (A-D,F) >");
 System.out.flush();
 Grade=GetChoice("ABCDF");;
 S.RemoveClass(Hours,Grade);
}

public static void main(String[] args) throws java.io.IOException
{char Choice;
 Student StudentA;
 System.out.println("Choose Initial Student Info:");
 System.out.println(" N)ame (BoB Jones) Only  A)ll Info  E)mpty Object");
 switch (Choice=GetChoice("NAE")) {
  case 'N':StudentA=new Student("Bob Jones");break;
  case 'A':
   System.out.print("Hours? >");
   System.out.flush();
   int Hours=ReadInt();
   System.out.print("Points? >");
   System.out.flush();
   int Points=ReadInt();
   StudentA=new Student("Bob Jones",Hours,Points);break;
  default:StudentA=new Student();
 }
 do {
  switch (Choice=StudentMenu()) {
   case 'A':AddClass(StudentA);break;
   case 'C':if (StudentA.HoursCompleted()!=0) ChangeClass(StudentA);break;
   case 'R':if (StudentA.HoursCompleted()!=0) RemoveClass(StudentA);break;
   case 'P':StudentA.PrintStudentInfo();break;
   case 'H':System.out.println( "Hours Completed:" + StudentA.HoursCompleted()+"\n");
	    break;
   case 'S':SetStudentName(StudentA);break;
  }
 } while (Choice!='E');
}


}