import java.util.*;

//Ben Feldman
//This program calculates a student's course grade based on their homework and test grades.
public class Gradanator {
   public static void main(String[] args){
      Scanner console = new Scanner(System.in);

      preamble();
      gradeCalculator(console);
   }

   //Prints the introduction message
   public static void preamble(){
      System.out.println("This program reads exam/homework scores");
      System.out.println("and reports your overall course grade.");
      System.out.println();
   }

   //Calculates your final % grade in the class and a rough estimate of your grade on the 4.0 scale based on user input
   public static void gradeCalculator(Scanner console){
      double finalGrade = Math.round(10.0 * (test("Midterm", console) + test("Final", console) + homework(console))) / 10.0;
      System.out.println("Overall percentage = " + finalGrade);
      System.out.print("Your grade will be at least: ");
      if (finalGrade >= 100.0){
         System.out.println("4.0");
         System.out.println("A winner is you!");
      }
      else if (finalGrade >= 85.0){
         System.out.println("3.0");
         System.out.println("Good work! Nice shootin' Tex! You did it!");
      }
      else if (finalGrade >= 75.0){
         System.out.println("2.0");
         System.out.println("Good job, you're probably above average!");
      }
      else if (finalGrade >= 60.0){
         System.out.println("0.7");
         System.out.println("Hey, chin up, you could still pass. Maybe.");
      }
      else if (finalGrade < 60.0){
         System.out.println("0.0");
         System.out.println("That is certainly... unfortunate.");
      }
   }

   //Calculates the weighted score of a test of variable name based on user input
   public static double test(String testName, Scanner console){
      System.out.println(testName + ":");
      System.out.print("Weight (0-100)? ");
      int weight = console.nextInt();
      System.out.print("Score earned? ");
      int scoreRaw = console.nextInt();
      int scoreShifted = scoreRaw + shift(console);
      //Resets impossibly high grades to 100
      if (scoreShifted > 100){
         scoreShifted = 100;
      }
      //Resets negative grades to 0
      else if (scoreShifted < 0){
         scoreShifted = 0;
      }
      System.out.println("Total points = " + scoreShifted + " / 100");
      double scoreWeighted = scoreShifted * (weight/100.0);
      System.out.println("Weighted score = " + Math.round(scoreWeighted*10.0)/10.0 + " / " + weight);
      System.out.println();
      return scoreWeighted;
   }

   //Calculates the grade shift of a test, if present, based on user input
   public static int shift(Scanner console){
      System.out.print("Were scores shifted (1=yes, 2=no)? ");
      int isShift = console.nextInt();
      int shiftAmount;
      if (isShift == 1){
         System.out.print("Shift amount? ");
         shiftAmount = console.nextInt();
      }
      else if (isShift == 2){
         shiftAmount = 0;
      }
      //This section accounts for users not following instructions
      else{
         System.out.println("Error: Please type 1 or 2.");
         shiftAmount = shift(console);
      }
      return shiftAmount;
   }

   //Calculates the weighted score of your homework and your quiz section attendance based on user input
   public static double homework(Scanner console){
      System.out.println("Homework:");
      System.out.print("Weight (0-100)? ");
      int weight = console.nextInt();
      int scoreEarned = 0;
      int scorePossible = 0;
      System.out.print("Number of assignments? ");
      int numberOfAssignments = console.nextInt();
      for(int count = 1; count <= numberOfAssignments; count++){
         System.out.print("Assignment " + count + " score and max? ");
         scoreEarned = scoreEarned + console.nextInt();
         scorePossible = scorePossible + console.nextInt();
      }
      System.out.print("How many sections did you attend? ");
      int sectionPoints = 5*console.nextInt();
      //If the student attends more than 6 sections, this section ensures they only receive the maximum 30 points
      if(sectionPoints > 30){
        sectionPoints = 30;
      }
      int scoreTotal = scoreEarned + sectionPoints;
      //If the student scores over the maximum score, this resets the score to whatever the maximum score is
      if(scoreTotal > scorePossible + 30){
         scoreTotal = scorePossible + 30;
      }
      System.out.println("Section points = " + sectionPoints + " / 30");
      System.out.println("Total points = " + (scoreTotal) + " / " + (scorePossible + 30));
      double scoreWeighted = (scoreTotal) * weight / (scorePossible + 30.0);
      System.out.println("Weighted score = " + Math.round(scoreWeighted*10.0)/10.0 + " / " + weight);
      System.out.println();
      return scoreWeighted;
   }
}