//Extract "I + don't + nextword" + "delete" repeated phrases
//based on Daniel Shiffman code - week 1 - A2Z


import java.io.*;
import java.nio.*;
import java.nio.channels.*;


public class Exercise1{
	public static void main (String[] args) throws IOException {



		// Create an input stream and file channel
		// Using first argument as file name to read in
		FileInputStream fis = new FileInputStream(args[0]);
		FileChannel fc = fis.getChannel();

		// Read the contents of a file into a ByteBuffer
		ByteBuffer bb = ByteBuffer.allocate((int)fc.size());
		fc.read(bb);
		fc.close();

		// Convert ByteBuffer to one long String
		String content = new String(bb.array());

		// This line uses a regular expression which we haven't learned yet
		// '\\b' means split the text along word boundaries
		// We will cover this in more detail next week
		String[] words = content.split("\\b");

		// create a new string buffer ( that will store the words I + don't + nextword )
		StringBuffer findI = new StringBuffer();

		for ( int i=0; i< words.length;i++){
			String find = "I";
			if(words[i].equals(find)){
				findI.append(words[i]+ " don't " + words[i+2] + " " + "\n");
			}
		}

		// transform the StringBuffer to a String and then split each phrase into an Array
		String output1 = findI.toString();
		System.out.println(output1);
		String [] phrases = output1.split("\n");


		// Create new String Buffer ( to each the unique phrases will be appended)
		StringBuffer finali = new StringBuffer();
		// temp String to compare content ( use contains -- cannot use any method for String Buffer?)
		String finali2= "";
		for ( int b=0; b<phrases.length;b++){
			String Temp = phrases[b];
			for(int c = b+1; c<phrases.length;c++){
				if ( !phrases[c].equals(Temp) && !finali2.contains(Temp) ){
					finali.append(Temp + "\n");
					finali2 = finali.toString();
				}
			}
		}


		String output = finali2;


		// Create an output stream and file channel to write out a report
		// (Also print out report to screen)
		FileOutputStream fos = new FileOutputStream(args[1]);
		FileChannel outfc = fos.getChannel();

		// Convert content String into ByteBuffer and write out to file
		bb = ByteBuffer.wrap(output.getBytes());
		outfc.write(bb);
		outfc.close();

		System.out.println("Result written to " + args[1]);

	}
}