import java.util.*;
import java.lang.String;

public class main {
	public static void main(String[] args) {

		String[] students = { "1,John,Smith,John1989@gmail.com,20,88,79,59",
				"2,Suzan,Erickson,Erickson_1990@gmailcom,19,91,72,85",
				"3,Jack,Napoli,The_lawyer99@yahoo.com,19,85,84,87", "4,Erin,Black,Erin.black@comcast.net,22,91,98,82",
				"5,Jordan,Stoddard,jstodd5@wgu.edu,28,80,90,95" };

		Roster roster = new Roster();

		String delim = "[,]";
		for (int i = 0; i < students.length; i++) {
			String temp = students[i];
			String[] token = temp.split(delim);
			int tempAge = Integer.parseInt(token[4]);
			int tempGrade1 = Integer.parseInt(token[5]);
			int tempGrade2 = Integer.parseInt(token[6]);
			int tempGrade3 = Integer.parseInt(token[7]);
			Roster.add(token[0], token[1], token[2], token[3], tempAge, tempGrade1, tempGrade2, tempGrade3);
		}

		// testing class Roster methods
		Roster.print_all();
		roster.print_invalid_emails();
		for (int i = 0; i < roster.roster.size(); i++) {
			roster.print_average_grade(Integer.toString(i + 1));
		}
		roster.remove(Integer.toString(7));

		String a = "";
		String b = null;
		boolean match = (a == b);
		boolean test = a != b;
		System.out.println(test);
	}

	// start of student class
	public static class Student {
		private int studentID;
		private String m_firstName;
		private String m_lastName;
		private String m_email;
		private int age;
		private int grade1;
		private int grade2;
		private int grade3;

		public Student(String token[]) {
			setStudentID(Integer.parseInt(token[0]));
			setFirstName(token[1]);
			setLastName(token[2]);
			setEmail(token[3]);
			setAge(Integer.parseInt(token[4]));
			setGrade1(Integer.parseInt(token[5]));
			setGrade2(Integer.parseInt(token[6]));
			setGrade3(Integer.parseInt(token[7]));
		}

		// list of mutators

		public void setStudentID(int studentID) {
			this.studentID = studentID;
		}

		public void setFirstName(String firstName) {
			this.m_firstName = firstName;
		}

		public void setLastName(String lastName) {
			this.m_lastName = lastName;
		}

		public void setEmail(String email) {
			this.m_email = email;
		}

		public void setAge(int age) {
			this.age = age;
		}

		public void setGrade1(int grade) {
			this.grade1 = grade;
		}

		public void setGrade2(int grade) {
			this.grade2 = grade;
		}

		public void setGrade3(int grade) {
			this.grade3 = grade;
		}

		// list of accessors

		public int getStudentID(int studentID) {
			return studentID;
		}

		public String getFirstName(String m_firstName) {
			return m_firstName;
		}

		public String getLastName(String m_lastName) {
			return m_lastName;
		}

		public String getEmail(String m_email) {
			return m_email;
		}

		public int getAge(int age) {
			return age;
		}

		public int getGrade1(int grade1) {
			return grade1;
		}

		public int getGrade2(int grade2) {
			return grade2;
		}

		public int getGrade3(int grade3) {
			return grade3;
		}

		// displaying specific student data
		public void print() {
			int studentID = getStudentID(this.studentID);
			String m_firstName = getFirstName(this.m_firstName);
			String m_lastName = getLastName(this.m_lastName);
			;
			int age = getAge(this.age);
			String m_email = getEmail(this.m_email);
			int grade1 = getGrade1(this.grade1);
			;
			int grade2 = getGrade2(this.grade2);
			;
			int grade3 = getGrade3(this.grade3);
			;
			System.out.println("Student ID: " + studentID + "\tFirst Name: " + m_firstName + "\tLast Name: "
					+ m_lastName + "\tAge: " + age + "\tEmail Address: " + m_email + "\tGrades: {" + grade1 + ", "
					+ grade2 + ", " + grade3 + "}");
		}
	}

	public static class Roster {
		// roster holds student objects
		public static ArrayList<Student> roster = new ArrayList<Student>();

		public static void add(String studentID, String firstname, String lastname, String emailaddress, int age,
				int grade1, int grade2, int grade3) {
			String tempAge = Integer.toString(age);
			String tempGrade1 = Integer.toString(grade1);
			String tempGrade2 = Integer.toString(grade2);
			String tempGrade3 = Integer.toString(grade3);
			String[] tokens = { studentID, firstname, lastname, emailaddress, tempAge, tempGrade1, tempGrade2,
					tempGrade3 };
			Student temp = new Student(tokens);
			roster.add(temp);

		}

		public void remove(String studentID) {
			int compare = Integer.parseInt(studentID);
			System.out.print("Size" + roster.size());
			for (int i = 0; i < roster.size(); i++) {
				if (roster.get(i).studentID == compare) {
					System.out.println("It is a match");
					roster.remove(i);
					print_all();
					return;
				}
			}
			System.out.println("The Student ID was not found.");
		}

		// print the whole roster
		public static void print_all() {
			for (Student p : roster) {
				p.print();
			}
		}

		// displaying all student's average grade
		public void print_average_grade(String studentID) {
			for (Student p : roster) {
				if (Integer.parseInt(studentID) == p.studentID) {
					float avg = (p.grade1 + p.grade2 + p.grade3) / 3;
					System.out.println("StudentID #" + studentID + " average grade is: " + avg);
					return;
				}
			}
			System.out.println("No student with that ID was found");
		}

		// method for displaying invalid emails
		public void print_invalid_emails() {

			for (Student p : roster) {

				if (p.m_email.indexOf('@') == -1 || p.m_email.indexOf('.') == -1) {

					System.out.println("Invalid email address for student #: " + p.studentID + "\tEmail:" + p.m_email);

				}
			}
		}
	}

}