import java.io.FileReader;
import java.io.PrintWriter;
import java.util.Scanner;
import java.io.IOException;
import java.util.Random;

/**
   This program applies random html formatting to each line of a text file.
*/
public class Html {

   /** Random variable for generating data by all methods. */
   private static Random rand = new Random();
   /** Use as a limit in several methods. */
   private static final int MAX = 6;

   /** 
       The main method where execution begins.
       @param args not used.
       @throws IOException if there are file issues
   */
   public static void main(String[] args) throws IOException {
      Scanner keyboard = new Scanner(System.in);
      System.out.print("enter name of input text file: ");   
      String name = keyboard.nextLine();
   
      Scanner infile = new Scanner(new FileReader(name));
      PrintWriter outfile = new PrintWriter((name + ".html"));
   
      String line;
   
      while (infile.hasNext()) {
         line = infile.nextLine();
         outfile.println(format(line));
      }
      outfile.close();
   }
   
   /**
      Create an html randomly formatted line of text.
      @param line the original line
      @return the formatted line
   */
   public static String format(String line) {
      String result = line;
      result = color(result);
      result = heading(result);
      result = centering(result);
   
      return result;
   }

   /**
      Wrap a random html color code around a string.
      @param s the string to format
      @return the color formatted string
   */
   public static String color(String s) {
      String result = "";
      String codes = "0369CF";
      char c;
      final int parts = 3;
      for (int i = 1; i <= parts; i++) {
         c = codes.charAt(rand.nextInt(MAX));
         result = result + c + c;
      }
      return "<font color=\"#" + result + "\">" + s + "</font>";
   }

   /**
      Wrap a random html heading: h1 - h6 around a string.
      @param s the string to format
      @return the heading formatted string 
   */
   public static String heading(String s) {
      String hd = "h" + (rand.nextInt(MAX) + 1);
      return "<" + hd + ">" + s + "</" + hd + ">";
   }

   /**
      Randomly decide whether to center a string in html.
      @param s the string
      @return the string, possibly with center tags
   */
   public static String centering(String s) {
      if (rand.nextBoolean()) {
         return "<center>" + s + "</center>";
      }
   
      return s;   // no centering
   }

}