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

public class Text {

    static public void main(String args[]) {

      if (args.length != 3) throw new IllegalArgumentException("Text requires 3 arguments: TailInt StringToReplace ReplacementString");

      InputStreamReader in1 = new InputStreamReader(System.in);
      OutputStreamWriter out3 = new OutputStreamWriter(System.out);

      PipedReader in2 = new PipedReader();
      PipedWriter out1 = new PipedWriter();
      try { out1.connect(in2); }
      catch (IOException e) { System.out.println(e); }

      PipedReader in3 = new PipedReader();
      PipedWriter out2 = new PipedWriter();
      try { out2.connect(in3); }
      catch (IOException e) { System.out.println(e); }

      int initReadBufSize = 100;
      int initWriteBufSize = 100;

      // pass in the argument for tail on the command line
      int i1 = Integer.parseInt(args[0]);

      // Tail is the class that implements the file read function
      Tail t1 = new Tail(i1);

      FilterImpl tail = new FilterImpl(in1, out1, initReadBufSize, initWriteBufSize, t1);
      // give the computation thread a hook back into the Filter
      t1.setFilter(tail);

      // pass in the strings to replace on the command line
      String s1 = args[1];
      String s2 = args[2];

      // Replace is the class that implements the string replacement
      Replace r1 = new Replace(s1, s2);

      FilterImpl replace = new FilterImpl(in2, out2, initReadBufSize, initWriteBufSize, r1);
      // give the computation thread a hook back into the Filter
      r1.setFilter(replace);

      // Unique is the class that implements removing duplicate lines
      Unique u1 = new Unique();

      FilterImpl unique = new FilterImpl(in3, out3, initReadBufSize, initWriteBufSize, u1);
      // give the computation thread a hook back into the Filter
      u1.setFilter(unique);

      replace.startFilter();
      unique.startFilter();
      tail.startFilter();

    }
}