/*
 *   Intro to Programming CSE 1310
 * University of Texas at Arlington
 */

package code19feb19;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.InputMismatchException;
import java.util.NoSuchElementException;
import java.util.Scanner;

/**
 *
 * @author jcmtiernan
 */
public class Code19Feb19 
{

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) 
    {
        // Choices
        
        /*
        Class has 3 tests worth 60% of final grade
        Final 40%
            Do a research project 40%
            OR
            Take two more tests for 40% of grade
            OR
            Write 8 lab reports for 40% of grade
        
        Assumption: all grades are out of 100
        Algorithm for final grade:
        
        Average the 3 tests and mult by percentage (60)
        Find out how they are doing the final 40%
        if student chose the research project
            multiply project grade by 40% and save as final40Pct
        else if student chose two tests
            Average the 2 tests and mult by percentage (40) and save as final40Pct
        else if student chose 8 reports
            Average 8 reports and mult by percentage (40) and save as final40Pct
        // Final grade is 3 test value plus whichever they chose
        Final grade is 3 test value plus final40Pct
       
        */
        /*
        SEE NOTES WITH LABEL # for new/interesting topics
        SEE gradeInputErr for types of invalid data
        In gradeInputErr, all data for single student is on single line
        */
        
        // How do we enter grades for multiple students during the same run of the program?

        File inputFile = new File("gradeInputErrEst.txt");
        Scanner userInFile;
        boolean fileValid = true;
        try
        {
            userInFile = new Scanner(inputFile);
        }
        catch (FileNotFoundException fnfe) //fnfe is a variable that will hold the exception info
        {
            userInFile = new Scanner(System.in);
            System.out.println("-- Input file was not found.  Enter the data as prompted. ");
            System.out.println(fnfe);  // print the Exception error message            
            fileValid = false;
        }
        //Scanner userIn = new Scanner(System.in);
        double test1=0, test2=0, test3=0;
        int studentCount = 0;  // # keep a count of the students
        // # How would we calculate class average?  Class minimum?  Class maximum?

            // ^^ Find class max grade and class min grades        
        String lineIn;
        Scanner userIn;
        double estGrade = 0;
        
        while (userInFile.hasNextInt())
        {
            lineIn = userInFile.nextLine();
            userIn = new Scanner(lineIn);
            // ^^** Added extra data on line of input file - student estimated grade
            //    Will read in, then also print difference from actual with message
            //    Use formatted output to print the floating point values
            
            // ^^** Modify nested if else with char response to be a switch
            
            // ^^ Conditional operator in output?
            // ^^ Find class max grade and class min grades
            
            
            studentCount++;
            System.out.print("Student "+studentCount+": ");  // # header for each student
            if (!fileValid)
            {
                System.out.println("Please enter the three test grades separated by spaces: ");
            }
            try  // # error checking from input file data that could cause InputMismatchException
            {
                test1 = userIn.nextDouble();
                test2 = userIn.nextDouble();
                test3 = userIn.nextDouble();
            }
            catch (InputMismatchException imme) // # imme is a variable that will hold the exception info
            {
                System.out.println("-- There was invalid test data in the file. Setting grades to 0");
                System.out.println(imme);      // # print the Exception error message              
                test1 = 0;
                test2 = 0;
                test3 = 0;
            }
            //userIn.nextLine();

            // Class has 3 tests worth 60% of final grade
            
            System.out.println("The input test grades are "+test1+", "+test2+", and "+test3+"\n");
            double test60Pct = (test1 + test2+ test3)/3 * .6;
            System.out.println("The test average is "+test60Pct+" out of 60%");

            // Find out how they are doing the final 40%
            if (!fileValid)
            {
                System.out.println("\nWhich choice did you make for the final 40% of your grade?");
                System.out.println("A. Reseach project");
                System.out.println("B. Two additional tests");
                System.out.println("C. Eight reports");
                System.out.println("Please enter A, B, or C for your choice:");
            }


            char response = 'Z';
            //String resp = "";
            //resp = userIn.next();
            //response = resp.charAt(0);

            // # Can this input from the file ever cause an error?  [Special case is if file is empty]

            response = userIn.next().charAt(0);
            System.out.print("The entered choice is : "+response+"\n");
            // we are NOT going to do input validation (but later...)
            // at this point response should have 'A' or 'B' or 'C'
            /*
            if student chose the research project
                multiply project grade by 40% and save as final40Pct
            else if student chose two tests
                Average the 2 tests and mult by percentage (40) and save as final40Pct
            else if student chose 8 reports
                Average 8 reports and mult by percentage (40) and save as final40Pct

            */
            double final40Pct = 0;

            // ^^ Modify nested if else with char response to be a switch            
            // nested if-else structure
            
            switch (response)
            {
                case 'A':  
                case 'a':
            //if ((response == 'A') || (response == 'a')) // if (test for project choice) 
                    {
                    // true - statement to execute
                    double project;
                    if (!fileValid)
                        System.out.println("Enter the project grade 0.0 - 100.0 ");

                    try  // # handling possible invalid numeric input
                    {
                        project = userIn.nextDouble();
                    }
                    catch (InputMismatchException imme) //# imme is a variable that will hold the exception info
                    {      
                        System.out.println("-- There was invalid project data in the file. Setting grades to 0");
                        System.out.println(imme);      // # print the Exception error message                      
                        project = 0;
                        userIn.next();
                    }
                    //System.out.println("The input final project grade is "+project+"\n");
                    System.out.printf("The input final project grade is %6.2e\n\n",project);
                    final40Pct = project * .4;

                    //final40Pct = userIn.nextDouble() * .4;
                    System.out.println("The project grade was "+project);
                    break;
                    }
                case 'B':
                case 'b':
                // else if ((response == 'B')|| (response == 'b'))
                    {
                    double test4=0, test5=0;
                    if (!fileValid)
                        System.out.println("Please enter the final two test grades separated by spaces: ");
                    try // # handling possible invalid numeric input
                    {
                        test4 = userIn.nextDouble();
                        test5 = userIn.nextDouble(); 
                    }
                    catch (InputMismatchException imme) //# imme is a variable that will hold the exception info
                    {      
                        System.out.println("-- There was invalid final test data in the file. Setting grades to 0");
                        System.out.println(imme);      // # print the Exception error message 
                        test4 = 0;
                        test5 = 0; 
                        userIn.next();
                    }
                    System.out.println("The input final test grades are "+test4+" and "+test5+"\n");
                    final40Pct = (test4 + test5)/2 * .4;
                    System.out.println("The final test average is "+final40Pct+" out of 40%");
                    break;
                    }
                case 'C':
                case 'c':
                // else if ((response == 'C')|| (response == 'c'))
                   {
                    double rpt1=0, rpt2=0, rpt3=0, rpt4=0, rpt5=0, rpt6=0, rpt7=0, rpt8=0 ;
                    if (!fileValid)
                        System.out.println("Please enter the eight report grades separated by spaces: ");
                    try // # handling possible invalid numeric input
                    {
                        rpt1 = userIn.nextDouble();
                        rpt2 = userIn.nextDouble();
                        rpt3 = userIn.nextDouble();
                        rpt4 = userIn.nextDouble();
                        rpt5 = userIn.nextDouble();  // # Note that there is an error in the data for a C choice
                        rpt6 = userIn.nextDouble();  // # that does not get caught.  Why?
                        rpt7 = userIn.nextDouble();  // # HINT: How many lines in input file vs. how many students printed
                        rpt8 = userIn.nextDouble();
                    }
                    catch (InputMismatchException imme) // # imme is a variable that will hold the exception info
                    {      
                        System.out.println("-- There was invalid reports data in the file. Setting grades to 0");
                        System.out.println(imme);      // # print the Exception error message 
                        rpt1 = 0;
                        rpt2 = 0;
                        rpt3 = 0;
                        rpt4 = 0;
                        rpt5 = 0;
                        rpt6 = 0;
                        rpt7 = 0;
                        rpt8 = 0;
                        userIn.next();
                    }

                    catch (NoSuchElementException nsee)
                    {
                        System.out.println("-- Not enough report grades in the file");
                        System.out.println(nsee);
                        rpt1 = 0;
                        rpt2 = 0;
                        rpt3 = 0;
                        rpt4 = 0;
                        rpt5 = 0;
                        rpt6 = 0;
                        rpt7 = 0;
                        rpt8 = 0;                   
                    }

                    System.out.println("The input report grades are "+rpt1+", "+rpt2+", "+rpt3+", "+rpt4+", "+rpt5+", "+rpt6+", "+rpt7+", and "+rpt8+"\n");

                    final40Pct = (rpt1 + rpt2 + rpt3 + rpt4 + rpt5 + rpt6 + rpt7 + rpt8)/8 * .4;
                    System.out.println("The final report average is "+final40Pct+" out of 40%"); 
                    break;
                    }   
                default:
                //else  // they did not enter A, B or C
                    {
                    System.out.println("-- Your choice *"+response+"* was not valid");
                    final40Pct = 0;
                    }
            }

            System.out.println("After user input final 40% is "+final40Pct);
            double courseGrade = test60Pct + final40Pct;
            System.out.println("\n***The final course grade is "+courseGrade+"\n");

            // ^^ Added extra data on line of input file - student estimated grade
            //    Will read in, then also print difference from actual with message
            //    Use formatted output to print the floating point values            
            
            try
            {
                estGrade = userIn.nextDouble();
            }
            catch (InputMismatchException imme) // # imme is a variable that will hold the exception info
            { 
                estGrade = 0;
            }
            catch (NoSuchElementException nsee)
            {
                estGrade = 0;
            }
            
            if ((courseGrade > estGrade) && (estGrade != 0))
            {
                System.out.println("You did better than you expected! ");
            }
            else if (courseGrade == estGrade)
            {
                System.out.println("You estimated your grade perfectly!");
            }
            else if ((courseGrade < estGrade) && (estGrade != 0))
            {
                System.out.println("Uh-oh.  You did not do as well as you expected.");
            }
            else if (estGrade == 0)
            {
                System.out.println("No estimated grade was found\n\n");
            }
            
            if (estGrade != 0)
            System.out.printf("Estimate: %6.2f\tActual: %6.2f\n\n\n",estGrade, courseGrade);            
            
            // ^^ Conditional operator in output?  
            
            // ^^ Find class max grade and class min grades            

        }
        //System.out.println("Grades were calculated for "+studentCount+" students.");
        System.out.printf("Grades were calculated for %5d students.\n",studentCount);
        
    }
}