import java.util.Scanner;

public class GradeCalculator {

	public static void main(String[] args) {

		//declaring the variables WEIGHT
		int exam1Weight, exam2Weight;
		int finalExamWeight, labWeight;
		int projectWeight, attendanceWeight, quizWeight;
		//initialize
		exam1Weight = 0;
		exam2Weight = 0;
		finalExamWeight = 0;
		labWeight = 0;
		projectWeight = 0;
		attendanceWeight = 0;
		quizWeight = 0;

		//declaring the variable SCORE
		int exam1Score, exam2Score, finalExamScore;
		int labScore, projectScore, attendanceScore, quizScore;
		//initialize
		exam1Score = 0;
		exam2Score = 0;
		finalExamScore = 0;
		labScore = 0;
		projectScore = 0;
		attendanceScore = 0;
		quizScore = 0;

		//scanner for inputs
		Scanner keyboard = new Scanner(System.in);

		//printing LETTERGRADE and POINTRANGE
		System.out.println("Grading Scale:\n" +
							"A\t\t 90 - 100\n" +
							"B\t\t 80 - 89\n" +
							"C\t\t 70 - 79\n" +
							"D\t\t 60 - 69\n" +
							"F\t\t below 60");

		//declaring variables
		int finalOverallScore, totalKnownGradeWeight;
		double currentScore, avgToFinalLetterGrade;
		String input, letterGrade;

		System.out.print("What letter grade do you want to achieve for the course? ");

		String desiredGrade = keyboard.nextLine();
		//starting the if else statements
		if (desiredGrade.equals("A")) {
			finalOverallScore = 90;}

		else if (desiredGrade.equals("B")) {
			finalOverallScore = 80;}

		else if (desiredGrade.equals("C")) {
			finalOverallScore = 70;}

		else if(desiredGrade.equals("D")) {
			finalOverallScore = 50;}

		else if(desiredGrade.equals("F")) {
			finalOverallScore = 50;}
		else {
			System.out.println("Input Error");
			System.exit(0);
		}

		//entering the scores
		totalKnownGradeWeight = 0;
		//asking user to enter percentage weights
		System.out.print("Enter Percent Weights:\nExam 1:\t\t");

		exam1Weight = keyboard.nextInt();

		System.out.print("Exam 2:\t\t");
		exam2Weight = keyboard.nextInt();

		System.out.print("Final Exam:\t");
		finalExamWeight = keyboard.nextInt();

		System.out.print("Labs:\t\t");
		labWeight = keyboard.nextInt();

		System.out.print("Projects:\t");
		projectWeight = keyboard.nextInt();

		System.out.print("Attendance:\t");
		attendanceWeight = keyboard.nextInt();

		System.out.print("Quizzes:\t");
		quizWeight = keyboard.nextInt();


		int sumOfGradeWeights = (exam1Weight + exam2Weight + finalExamWeight + labWeight + projectWeight + attendanceWeight + quizWeight);

		if (sumOfGradeWeights > 100 || sumOfGradeWeights < 100)  {
			System.out.print("Weights don’t add up to 100, program exiting...");
			System.exit(0);
		}
		else
			System.out.println("Enter your scores out of a 100:");

		//prompt to enter the score
		System.out.print("Do you know your Exam 1 score?");
		String studentInput;
		studentInput = keyboard.next();

		//if else statements for unknown exam 1 & 2 scores

	if (studentInput.equalsIgnoreCase("yes") || studentInput.equalsIgnoreCase("y")) {

		System.out.print("Score received on exam 1:");
		exam1Score = keyboard.nextInt();
		keyboard.next();
		totalKnownGradeWeight += exam1Weight;

		System.out.print("Do you know your Exam 2 score?");
		studentInput = keyboard.nextLine();
			if (studentInput.equalsIgnoreCase("yes") || studentInput.equalsIgnoreCase("y"))
			{
				System.out.print("Score received on final exam: ");
				finalExamScore = keyboard.nextInt();
				keyboard.next();
				totalKnownGradeWeight += finalExamWeight;
			}

		//using switch statements--

		//switch statements for project
		System.out.print("Do you know your project average? ");
		input = keyboard.next();
		switch (input)
		{
			case "yes":
			case "ye":
			case "y":
				System.out.print("Average Project Grade: ");
				projectScore = keyboard.nextInt();
				totalKnownGradeWeight += projectWeight;
				break;
			default:
				projectScore = 0;
				projectWeight = 0;
				break;
			}

		//switch statements for attendance
		System.out.print("Do you know your attendance average? ");
			input = keyboard.next();
			switch (input)
			{
				case "yes":
				case "ye":
				case "y":
					System.out.print("Average Attendance Grade: ");
					attendanceScore = keyboard.nextInt();
					totalKnownGradeWeight += attendanceWeight;
					break;
				default:
					attendanceScore = 0;
					attendanceWeight = 0;
					break;
			}

		//switch statements for quiz
		System.out.print("Do you know your quiz average? ");
		input = keyboard.next();
		switch (input)
		{
			case "yes":
			case "ye":
			case "y":
				System.out.print("Average Quiz Grade: ");
				quizScore = keyboard.nextInt();
				totalKnownGradeWeight += quizWeight;
				break;
			default:
				quizScore = 0;
				quizWeight = 0;
				break;
			}
			}
	//computing the scores
	double gradeScore;
	gradeScore = (exam1Weight * exam1Score) + (exam2Weight * exam2Score) + (finalExamWeight * finalExamScore) + (labWeight * labScore) + (projectWeight * projectScore) + (attendanceWeight * attendanceScore) + (quizWeight * quizScore);
	double gradeWeight;
	gradeWeight = totalKnownGradeWeight;
	double currentScore1;
	currentScore1 = (gradeScore/gradeWeight);

	System.out.printf("Current Score %5.2f" , currentScore1);

	//Converting current score to a letter grade
	String currentLetterGrade;
	if(currentScore >= 90)
	{
		currentLetterGrade = "A";
	}
		else if(currentScore1 >= 80)
		{
			currentLetterGrade = "B";
		}
		else if(currentScore1 >= 70)
		{
			currentLetterGrade = "C";
		}
		else if(currentScore1 >= 60)
		{
			currentLetterGrade = "D";
		}
		else
		{
			currentLetterGrade = "F";
		}
		System.out.println("Your current letter grade is a " + currentLetterGrade);


	//if else statements for outputs

		int gradeWanted;
		if(totalKnownGradeWeight == 100)
		{
			if(currentLetterGrade.equals(gradeWanted))
				System.out.println("Congratulations! You recieved the " + gradeWanted + " that you wanted!");
			else
				System.out.println("Sorry, you did not recieved the " + gradeWanted + " that you wanted.");
			System.exit(0);
		}

		//
		double avgFinalLetterGradeNumerator = (100 * finalOverallScore) - gradeScore;
		double abgFinalLetterGradeDenominator = (100 - totalKnownGradeWeight);
		double avgFinalLetterGradeDenominator;
		avgToFinalLetterGrade = (avgFinalLetterGradeNumerator/avgFinalLetterGradeDenominator);

		if(avgToFinalLetterGrade > 100)
		{
			System.out.println("Sorry, you cannot recieve a " + gradeWanted + " in the course");
		}
		else if(avgToFinalLetterGrade >= 0) {
			System.out.printf("You have to score an average greater than or equal to a %5.1f", avgToFinalLetterGrade);
			System.out.print(" in the remaining grade items to receieve a " + gradeWanted + " in the course");
		}
		else{
			System.out.println("You will recieve a " + gradeWanted + " no matter what");
		}

	}














	}

}