/*
Program Description:

Program takes a line of text from a text file (excerpt) and outputs it on the console. The program also prints the
entire text file from which the excerpt was taken. The name of the text file to be used is to be inputted as a command line argument.

*/

import java.io.*;
import java.util.Random;
import java.io.FileReader;
import java.io.File;

public class Main

{
    BufferedReader reader = null;
    File filename = null;
    String line;
    LineNumberReader lnr = null;
    FileReader fr = null;

    int numOfLines=0;


    public Main (String nameOfTextFile)

    {

        try

        {
            filename = new File(nameOfTextFile);
            reader = new BufferedReader(new FileReader(filename));
            fr = new FileReader(filename);
            lnr = new LineNumberReader(fr);

        }

        catch(FileNotFoundException e)
        {
            System.out.println("Error: text file does not exist");
        }

        catch(Exception e)
        {
            System.out.println("General Errors");
        }


    }

    public void printAllLines ()

    {

        try
        {

            line = reader.readLine();

            while (line != null)
            {
                System.out.println(line);
                line = reader.readLine();
            }

            reader.close ();
        }

        catch(Exception e)
        {
            System.out.println("Error: file manipulation error");
        }


    }


    public void getExcerpt ()

    {

        try
        {

            int startingLineNum=0;
            int endingLineNum=0;
            int lineCount=0;
            Random rand = new Random();

            line = reader.readLine();

            while (line != null)
            {

                System.out.println(line);
                line = reader.readLine();
                numOfLines ++;
            }



            while (line != null)
            {

                System.out.println(line);
                line = reader.readLine();
                numOfLines ++;
            }



            startingLineNum = rand.nextInt(numOfLines);
            endingLineNum = rand.nextInt(numOfLines);


        }

        catch(Exception e)
        {
            System.out.println("Error: file manipulation error");
        }

        finally
        {

        }
    }


    public static void main(String[] args) throws Exception

    {

        try
        {

            Main excerptDemo = new Main (args[0]);
            System.out.println ("\nText File Excerpt:\n");
            excerptDemo.getExcerpt ();

            System.out.println ("\nExcerpt taken from: \"" +excerptDemo.filename.getName() + "\"\n");
            excerptDemo.printAllLines ();

            //the two bolded methods are the methods that can't seem to work together

        }

        catch (ArrayIndexOutOfBoundsException e)
        {
            System.out.println("Error: Name of text file was not specified in command line argument");
        }

    }




}