import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.Scanner;

public class Student_Manage {
	static Scanner scan = new Scanner(System.in);
	static int stt=0;
	
	public static boolean Save_to_file(Student ds, String path) {
        try {
            FileOutputStream fos = new FileOutputStream(path);
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(ds);
            oos.close();
            fos.close();
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }
    @SuppressWarnings("unchecked")
	public static Student Read_from_file(String path) {
        
        Student s=null;
		try {
            FileInputStream fis = new FileInputStream(path);
            ObjectInputStream ois = new ObjectInputStream(fis);
            Object o = ois.readObject();
            s = (Student) o;
            ois.close();
            fis.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return s;
    }
   public static void Readstudentlist(Student list) {
	   if (list!=null) {
		   Readstudentlist(list.left);
		   System.out.printf("%-3d %-8d %-20s %-10.2f %-10s",++stt,list.getStudent_id(),list.getStudent_name(),list.getStudent_result(),list.getStudent_rank());
	    	System.out.println();
	    	Readstudentlist(list.right);
	   }
   
    }
   public static Student Addnode(Student ds,Student e) {
	   if (ds==null) return e;
	   else if (ds.getStudent_id()<e.getStudent_id()) ds.right=Addnode(ds.right,e);
	   else ds.left = Addnode(ds.left,e);
	   return ds;
   }
   public static int comp(Student o1,Student o2) {
	   if (o1.getStudent_id()==o2.getStudent_id()) return 0;
	   else return 1;
   }
   public static void AddStudent(Student list) {
	   int id;
	   String name;
	   double result;
	   System.out.println("Input Student Information:");
	   
	   System.out.println("Input id: ");id = scan.nextInt();
	   scan.nextLine();
	   System.out.println("Input name: ");name = scan.nextLine();
	   System.out.println("Input result: ");result = scan.nextDouble();
	   Student e = new Student(id,name);
	   e.setStudent_result(result);
	   if (result<5) e.setStudent_rank("Fail");
	   else e.setStudent_rank("PASS");
	   list = Addnode(list,e);
	   
   }
   public static void main(String[] args) {
		// TODO Auto-generated method stub
		Student list;
		list=Read_from_file("D:\\StudentList.dat");
		
		
		
		Student s1 = new Student(100,"Nguyen Van Dung");
		Student s2 = new Student(104,"Nguyen Thi Hanh");
		Student s3 = new Student(106,"Tran Thi Hai");
		Student s4 = new Student(109,"Le Van Phuoc");
		Student s5 = new Student(101,"Quach Thanh Danh");
		Student s6 = new Student(105,"Vu Van Hung");
		Student s7 = new Student(102,"Le Tien Loc");
		Student s8 = new Student(107,"Pham Quang Minh");
		Student s9 = new Student(108,"Ho Van Mui");
		Student s10 = new Student(103,"Nguyen Van Dat ");
		Student s11 = new Student(110,"Le Van Hai");
		list = s6;
		list = Addnode(list,s1);
		list = Addnode(list,s2);
		list = Addnode(list,s3);
		list = Addnode(list,s4);
		list = Addnode(list,s5);
		list = Addnode(list,s7);
		list = Addnode(list,s8);
		list = Addnode(list,s9);
		list = Addnode(list,s10);
		list = Addnode(list,s11);
		
		Readstudentlist(list);
		
		Save_to_file(list,"D:\\StudentList.dat");
		
		int menu=1;
		
		while (menu!=0) {
		System.out.println("STUDENT MANAGE PROGRAM");
		System.out.println("1-Open Student List from File");
		System.out.println("2-View Student List ");
		System.out.println("3-Add a Student to the List ");
		System.out.println("0-Save/Exit");
		System.out.println("Please choose: ");
		menu = scan.nextInt();
					
		switch (menu) {
		case 1: {list=Read_from_file("D:\\StudentList.dat");break;}
		case 2: {stt=0;System.out.println("READ LIST:"); Readstudentlist(list); break;}
		case 3: {AddStudent(list);break;}
		case 0: {Save_to_file(list,"D:\\StudentList.dat");break;}
		}
		}
		
		scan.close();
		}

	}