import javax.swing.*;
import java.util.Date;

/*
 * produce an academic transcript
 *
 * COMP 1010 Section A02
 * Instructor:  Domaratzki
 * Assignment:  Assignment 3, Question 1
 * @author:     Nick Ratuski
 * @version:    1.0 - 2007-October
 */

public class Ratuski_Nicholas_A3Q1 {
    /*
     * PURPOSE: produce an academic transcript based on input given by user.
     */
     
    //Method to find amount of students to process 
    public static int getStudentAmount() {
    	int amount;   //# of students to process
    	String temp;  //temporary input string
    	
    	 //get input
        temp = JOptionPane.showInputDialog
        ("Enter the number of students to process (between 1 and 10).");
        amount = Integer.parseInt(temp);
        
        if (amount > 10 || amount < 1) {
        	//user input invalid, retrieve it again
        	getStudentAmount();	
        }
        return amount;
    }
    
    //Since java doesn't have array.hasValue, i'll make a method for it myself.
    //Method to return true if an array contains item.
    public boolean hasValue(String table[], String item) {
    	int length = table.getLength();
    	for ( int i=0; i<length; i++ ) {
    		if (table[i].equals(item)) {
    			//Found the item in the table.
    			return true;
    		}
    	}
    	//The loop never found any matches, return false.
    	return false;
    }
     
    public static void main (String [] args) {

        String temp;                           //temporary input string
        String name;                           //student name
        String studentID;                      //student ID
        String course;                         //course name
        String grade;                          //letter grade
        int number;                            //number of classes being taken.
        int total;                             //running total
        int amount;                            //# of students to process
        boolean addGrades;                     //boolean flag to allow entering of grades
        
        //corresponding letter and number grades
        String[] letterGrades = new String[]{"A+","A","B+","B","C+","C","D","F"};
        int[] numberGrades = new int[]{4.5,4.0,3.5,3.0,2.5,2.0,1.0,0};

        amount = getStudentAmount();        //find how many students need processing

        //confirm input
        System.out.println ("You have entered " + amount + " students to process.");
        
        for ( int i=0; i<amount; i++ ) {
        	addGrades = true;
        	temp = JOptionPane.showInputDialog
        	("Enter the student number and name. (ex. 1234567Doe, Jane)");
        	name = temp.substring(7);
        	studentID = temp.substring(0,7);
        	
      		System.out.println("Transcript for: " + name + " " + studentID);
        	total = 0;
        	number = 0;
        	
        	while (addGrades == true) {
        		temp = JOptionPane.showInputDialog
        		("Enter a course ID and grade. (ex. COMP1010C+)");
        		course = temp.substring(0,8);
        		grade = temp.substring(8);
        		if (temp.equals("EXIT") || temp.equals("exit")) {
        			//end the while loop, they're exiting.
        			addGrades = false;
        			break;
        		}
        		for ( int i=0; i<7; i++ ) {
        			if (grade.toUpperCase().equals(letterGrades[i])) {
        				//Their course and grade are valid.
        				System.out.println(course + " " + grade.toUpperCase());
        				total = total + numberGrades[i];
        				number++;
        			}
        		}
        	}
        	//print the GPA.
        	System.out.println("GPA for " + name + ": " + total/number);
        }
    System.out.println("\nProgrammed by Nick Ratuski");
   	System.out.println("Date: Saturday, November 3");
   	System.exit(0);
}