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

public class StudentNodeTest
{
    private static BufferedReader console;
    private static boolean validCommand;
    private static Iterator iter;
    
    public static void main(String[] args) throws IOException, FileNotFoundException, ClassNotFoundException
    {
        /*
        Run this code to test w/o a menu.
        
        StudentNode jon = new StudentNode("Jon", "Pezzino", 4.0);
        Iterator iter = new Iterator(jon);
        iter.add(new StudentNode("Herbert", "Bunkel, Q.", 3.0));
        iter.add(new StudentNode("Mayhew", "Lieberstein", 3.5));
        iter.add(new StudentNode("Spongebob", "Squarepants", 1.0));
        iter.add(new StudentNode("Bonnie &", "Clyde", 2.0));
        iter.add(new StudentNode("Albert", "Einstein", 3.9));
        iter.add(new StudentNode("Maddox", "Nolastname", 2.1));
        iter.add(new StudentNode("1337", "H4X0R", 1.2));
        iter.add(new StudentNode("Jimmy", "Jimmy!", 2.9));
        iter.add(new StudentNode("Bob", "Johnson", 2.7));
        iter.add(new StudentNode("Alan", "Shmidov", 2.8));
        
        iter.printAlphaOrder();
        */
              
        iter = new Iterator(null);
        
       
        InputStreamReader reader = new InputStreamReader(System.in);
        console = new BufferedReader(reader);
        
        String input = "";
        
        while(true)
        {
            printMenu();
            input = console.readLine();
            validCommand = false;
            
                if(input.equals("A"))
                {
                    add();
                }
                    
                if(input.equals("R"))
                {
                    remove();
                }
                
                if(input.equals("P"))
                {
                    print();
                }
                
                if(input.equals("Q"))
                {
                    reversePrint();
                }
                
                if(input.equals("D"))
                {
                    deansList();
                }
                
                if(input.equals("F"))
                {
                    search();
                }
                
                if(input.equals("E"))
                {
                    export();
                }
                
                if(input.equals("I"))
                {
                    importFile();
                }
                    
                if(input.equals("X"))
                {
                    exit();
                }
                
                if(!validCommand)
                {
                    System.out.println("Invalid command. Please try again.");
                }
        }
    }
    
    public static void printMenu()
    {
        System.out.println("\n---------------"
                           + "\nA - Add a student" 
                           + "\nR - Remove a student"
                           + "\nP - Print all students"
                           + "\nQ - Print all students in reverse alphabetical order"
                           + "\nD - Dean's list"
                           + "\nF - Find name"
                           + "\nE - Export to File"
                           + "\nI - Import from File"
                           + "\nX - Quit");
    }
    
    private static void add() throws IOException
    {
        System.out.println("Add a student. \nFirst Name: ");
        String firstName = console.readLine();
        System.out.println("Last name: ");
        String lastName = console.readLine();
        System.out.println("GPA: ");
        double gpa = Double.parseDouble(console.readLine());
        iter.add(new StudentNode(firstName, lastName, gpa));
        System.out.println("Student added.");
        validCommand = true;
    }
    
    private static void remove() throws IOException
    {
        System.out.println("Remove a student. \nStudent Name (First or Last):");
        String name = console.readLine();
        iter.removeStudent(name);
        System.out.println("Student removed.");
        validCommand = true;
    }
    
    private static void print()
    {
        System.out.println("Print all students. \n----------");
        iter.printAlphaOrder();
        validCommand = true;
    }
    
    private static void reversePrint()
    {
        System.out.println("Print all students in reverse alphabetical order. \n----------");
        iter.printReverseAlphaOrder();
        validCommand = true;
    }
    
    private static void deansList() throws IOException
    {
        System.out.println("Dean's List. \nMinimun GPA to make Dean's List:");
        iter.printDeansList(Double.parseDouble(console.readLine()));
        validCommand = true;
    }
    
    private static void search() throws IOException
    {
        System.out.println("Search Students. \nStudent Name (First or Last): ");
        iter.search(console.readLine());
        validCommand = true;
    }
    
    private static void exit() throws IOException
    {
        System.out.println("Exiting.");
        System.exit(0);
    }
    
    private static void export() throws FileNotFoundException, IOException
    {
        System.out.println("Exporting to File students.dat.");
        ArrayList sendToFile = iter.packageNodes();
        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("students.dat"));
        out.writeObject(sendToFile);
        validCommand = true;
    }
    
    private static void importFile() throws FileNotFoundException, IOException, ClassNotFoundException
    {
        ObjectInputStream in = new ObjectInputStream(new FileInputStream("students.dat"));
        ArrayList imp = (ArrayList)in.readObject();
        iter = (Iterator)imp.get(0);
        validCommand = true;
    }
    
}