import java.io.*;
import java.util.ArrayList;


/**
 * Created by flo on 9/1/15.
 */
public class AssignScore {

    // Private data members
    private ArrayList<Integer> numGrade;
    private ArrayList<String> letterGrade;
    private Double mean;

    public AssignScore() {
        // initializing Data Members
        this.numGrade = new ArrayList<Integer>();
        this.letterGrade = new ArrayList<String>();
        this.mean = 0.00;
    }

    // reading from a file via redirection java Project1Driver < data.txt
    public void readFile() {

        String line;
        String[] scores = new String[0];
        BufferedReader br = null;

        br = new BufferedReader(new InputStreamReader(System.in));

        // read each line from file and split it based on a space
        try {
            while ((line = br.readLine()) != null) {
                scores = line.split(" "); // "\\s+" many spaces
            }
        } catch (IOException err) {
            System.out.println(err.getMessage());
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException err) {
                    System.out.println("Lets exit this program, this is not suppose to happen");
                    System.exit(1);
                }
            }
        }

        // add each scores to an arraylist
        for (String score : scores) {
            try {
                numGrade.add(Integer.parseInt(score));
            } catch (NumberFormatException err) {
                System.out.println(err.getMessage());
            }
        }
    }

    // Compute the mean of the arraylist
    public void computeMeanScore() {
        int sum = 0;

        for (Integer x : numGrade) {
            sum += x;
        }
        this.mean = (double) (sum / numGrade.size());
    }

    // Assign letter grade to each of the scores from data input file
    public void assignLetterGrade() {
        // find out the 10 percent difference then add or sub it from ograde and ugrade
        double diff = this.mean * .10;
        double oGrade = this.mean + diff;
        double uGrade = this.mean - diff;

        for (int grade = 0; grade < numGrade.size(); grade++) {
            if (numGrade.get(grade) > oGrade) {
                letterGrade.add("O");
            } else if (numGrade.get(grade) <= oGrade && numGrade.get(grade) >= uGrade) {
                letterGrade.add("S");
            } else if (numGrade.get(grade) < uGrade) {
                letterGrade.add("U");
            }
        }
    }

    // write the data or information stored on Arraylist to a file called output.txt
    public void writeFile() {

        OutputStreamWriter osWriter = null;
        OutputStream outStream = null;

        try {
            osWriter = new OutputStreamWriter(new FileOutputStream("output.txt"));

        } catch (FileNotFoundException err) {
            System.out.println("File does not exist" + err.getMessage());
        }

        for (int x = 0; x < numGrade.size(); x++) {
            try {
                osWriter.write(numGrade.get(x) + "," + letterGrade.get(x));
            } catch (IOException err) {
                System.out.println(err.getMessage());
            }
            try {
                osWriter.write("\n");
            } catch (IOException err) {
                System.out.println(err.getMessage());
            }
        }

        try {
            osWriter.close();
        } catch (IOException err) {
            System.out.println(err.getMessage());
        }
    }
}