/**
* EasyWriter (with apologies to Dennis Hopper)
* Provides a simple interface for text stream output
* @author Guy J Brown
* First version 16/2/2000
* Modified from a suggestion of Robert Chisholm to use PrintStream instead of
* PrintWriter 6 October 2015
* SDN removed a legacy method 21 November 2017
*/

package sheffield;

import java.io.*;

public class EasyWriter extends PrintStream {

    // Constructors

    /**
    * Create a new EasyWriter that writes to standard output
    */
    public EasyWriter() {
        super(System.out,true);
    }

    /**
    * Create a new EasyWriter that writes to a text file
    * @param s the name of the text file
    */
    public EasyWriter(String s) {
        super(getFileWriter(s),true);
    }

    // Private methods

    private static FileOutputStream getFileWriter(String s) {
        FileOutputStream f = null;
        try {
            f = new FileOutputStream(s);
        }
        catch (IOException e) {
            System.err.println("Error in EasyWriter - couldn't create output file");
            System.exit(0);
        }
        return f;
    }

    private double rounded(double x, int ndp) {
        return Math.round(x*Math.pow(10,ndp))/Math.pow(10,ndp);
    }

    private String padfield(double x, int n, int w) {
        String s = padfrac(x,n);
        while (s.length()<w) s=" "+s;
        return s;
    }

    private String padfrac(double x, int n) {
        String s = Double.toString(rounded(x,n));
        int ndp = n-(s.length()-s.indexOf('.')-1);
        for (int i=0; i<ndp; i++) s+="0";
        return s;
    }

    private String padwhole(long x, int n) {
        String s = Long.toString(x);
        while (s.length()<n) s=" "+s;
        return s;
    }

    // formatted int

    /**
    * Println an int within a specified field width
    * @param x the number to println
    * @param n the field width
    */
    public void println(int x, int n) {
        println(padwhole(x,n));
    }

    /**
    * Print an int within a specified field width
    * @param x the number to print
    * @param n the field width
    */
    public void print(int x, int n) {
        print(padwhole(x,n));
    }

    // formatted long

    /**
    * Println a long within a specified field width
    * @param x the number to println
    * @param n the field width
    */
    public void println(long x, int n) {
        println(padwhole(x,n));
    }

    /**
    * Print a long within a specified field width
    * @param x the number to print
    * @param n the field width
    */
    public void print(long x, int n) {
        print(padwhole(x,n));
    }

    // formatted short

    /**
    * Println a short within a specified field width
    * @param x the number to println
    * @param n the field width
    */
    public void println(short x, int n) {
        println(padwhole(x,n));
    }

    /**
    * Print a short within a specified field width
    * @param x the number to print
    * @param n the field width
    */
    public void print(short x, int n) {
        print(padwhole(x,n));
    }

    // formatted double

    /**
    * Print a double with a specified precision
    * @param x the number to print
    * @param n the number of decimal places
    */
    public void print(double x, int n) {
        print(padfrac(x,n));
    }

    /**
    * Println a double with a specified precision
    * @param x the number to println
    * @param n the number of decimal places
    */
    public void println(double x, int n) {
        println(padfrac(x,n));
    }

    /**
    * Print a double with a specified precision and field width
    * @param x the number to print
    * @param n the number of decimal places
    * @param w the field width
    */
    public void print(double x, int n, int w) {
        print(padfield(x,n,w));
    }

    /**
    * Println a double with a specified precision and field width
    * @param x the number to println
    * @param n the number of decimal places
    * @param w the field width
    */
    public void println(double x, int n, int w) {
        println(padfield(x,n,w));
    }

    // formatted float

    /**
    * Print a float with a specified precision
    * @param x the number to print
    * @param n the number of decimal places
    */
    public void print(float x, int n) {
        print(padfrac(x,n));
    }

    /**
    * Println a float with a specified precision
    * @param x the number to println
    * @param n the number of decimal places
    */
    public void println(float x, int n) {
        println(padfrac(x,n));
    }

    /**
    * Print a float with a specified precision and field width
    * @param x the number to print
    * @param n the number of decimal places
    * @param w the field width
    */
    public void print(float x, int n, int w) {
        print(padfield(x,n,w));
    }

    /**
    * Println a float with a specified precision and field width
    * @param x the number to println
    * @param n the number of decimal places
    * @param w the field width
    */
    public void println(float x, int n, int w) {
        println(padfield(x,n,w));
    }

}