package javaca2;

import java.util.Scanner;

public class JavaCA2 {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        //Variable/Constant Declaration.
        final double FEES = 3000;
        String userName, password, passwordVerify, eol, studentName, studentNum;
        int attemptsRemain, userChoice, resultTot, numStudents = 0, paid100 = 0, paid75 = 0, paid50 = 0, paid0 = 0;
        double resultAvg, totAvg = 0, feeGiven, overallPaid = 0;

        //Username Checking
        System.out.print("Please enter Username (Minimum 6 characters): ");
        userName = in.nextLine();

        for (attemptsRemain = 3; attemptsRemain != 0; attemptsRemain--) {
            if (userName.length() < 6) {        //Loops if the username is too short
                System.out.println("Invalid Username " + attemptsRemain + " attempt(s) remaining.");
                System.out.print("\nPlease enter Username (Minimum 6 characters): ");
                userName = in.nextLine();
            } else if (userName.length() >= 6) {    //Breaks out of the loop if it's the right length
                System.out.println("Username entered successfully.\n");
                break;
            }
        }
        //Checks if Username is wrong too many times
        if (attemptsRemain < 0) {
            System.err.println("Username Entered wrong too many times, please try again.");
            System.exit(0);
        }

        //Password Checking
        System.out.print("Please Enter your password (Case-Sensitive): ");
        password = in.nextLine();
        System.out.print("Please Verify your password (Case-Sensitive): ");
        passwordVerify = in.nextLine();

        for (attemptsRemain = 3; attemptsRemain != 0; attemptsRemain--) {
            if (!password.equals(passwordVerify)) {     //Loops if they don't match
                System.out.println("\nPasswords do not match, please try again. " + attemptsRemain + " attempt(s) remaining");

                System.out.print("\nPlease Enter your password (Case-Sensitive): ");
                password = in.nextLine();
                System.out.print("Please Verify your password (Case-Sensitive): ");
                passwordVerify = in.nextLine();         //Breaks out of loop if they match
            } else if (password.equals(passwordVerify)) {
                System.out.println("Password entered successfully.\n");
                break;
            }
        }
        //Checks if the passwords are wrong too many times
        if (attemptsRemain < 0) {
            System.err.println("Password Entered wrong too many times, please try again.");
            System.exit(0);
        }

        //Menu System
        System.out.println("\n\tStudent Finance System");
        System.out.println("1. Calculate Student Grant");
        System.out.println("2. Current Overall Student Average");
        System.out.println("3. Fee Data");
        System.out.println("4. Grant Category Information");
        System.out.println("5. Exit");
        userChoice = in.nextInt();

        while (userChoice != 5) {
            switch (userChoice) {
                case 1:
                    eol = in.nextLine();
                    System.out.print("Enter Name: ");
                    studentName = in.nextLine();
                    System.out.print("Enter Student Number (XNumber): ");
                    studentNum = in.nextLine();

                    while (studentNum.charAt(0) != 'X') {
                        System.out.print("Please re-enter stduent number (must start with 'X'): ");
                        studentNum = in.nextLine();
                    }

                    resultTot = 0;
                    System.out.print("Enter Software Development Result: ");
                    resultTot += in.nextInt();
                    System.out.print("Enter Mathematics Result: ");
                    resultTot += in.nextInt();
                    System.out.print("Enter Learning to Learn Result: ");
                    resultTot += in.nextInt();
                    System.out.print("Enter Computer Architecture Result: ");
                    resultTot += in.nextInt();

                    resultAvg = (resultTot / 4.0);
                    System.out.println();

                    System.out.println(studentName + " (" + studentNum + ") Average Result: "+ resultAvg);

                    if (resultAvg >= 90 && resultAvg <= 100) {
                        feeGiven = FEES;
                        System.out.print("100% ");
                    }
                    else if (resultAvg >=70 && resultAvg <90) {
                        feeGiven = (FEES * 0.75);
                        System.out.print("75% ");

                    }
                    else if (resultAvg >=50 && resultAvg <70) {
                        feeGiven = (FEES * 0.50);
                        System.out.print("50% ");
                    }
                    else if (resultAvg <=50 && resultAvg >= 0) {
                        feeGiven = 0;
                        System.out.print("0% ");
                    }
                    else {
                        System.out.println("Invalid Result Average, Please try again");
                        break;
                    }
                    System.out.printf("(€%.2f) of the €%.0f fee is paid." , feeGiven, FEES);

                    numStudents++;
                    totAvg += resultAvg;
                    overallPaid += feeGiven;
                    break;
                case 2:
                    System.out.println("The Overall Average is: " + (totAvg / numStudents));
                case 3:
                case 4:
                default:

                    //Reprint Menu and ask for choice
                    System.out.println("\n\n\tStudent Finance System");
                    System.out.println("1. Calculate Student Grant");
                    System.out.println("2. Current Overall Student Average");
                    System.out.println("3. Fee Data");
                    System.out.println("4. Grant Category Information");
                    System.out.println("5. Exit");
                    userChoice = in.nextInt();
            }
        }
    }

}