// This appears in Core Web Programming from
// Prentice Hall Publishers, and may be freely used
// or adapted. 1997 Marty Hall, hall@apl.jhu.edu.
// Modified by Nong Lin, Nov. 1999

import java.awt.*;
import java.net.*;
import java.io.*;
import java.lang.*;


public class HttpClient extends NetworkClient {
  private String requestLine;
  private summaryResult summaryresult;
  private TextArea outputArea, summaryArea;
  private Interruptable app;

 

  public HttpClient(String host,
                    int port,
                    String requestLine,
                    //summaryResult summaryresult,
                    TextArea summaryArea,
                    TextArea outputArea,
                    Interruptable app) {
    super(host, port);
    this.requestLine = requestLine;
    this.summaryArea = summaryArea;
    this.outputArea = outputArea;
    this.app = app;
    if (checkHost(host))
      connect();

    System.out.println("HttpClient constructor");
  }

  protected void handleConnection(Socket uriSocket)
      throws IOException {
    try {
      SocketUtil s = new SocketUtil(uriSocket);

      PrintStream out = s.getPrintStream();
      DataInputStream in = s.getDataStream();     
     
 
      summaryArea.setText("For Simple, only Page Title shown here:----");
      
      outputArea.setText("");
      out.println(requestLine);
      System.out.println("Http" +requestLine);

      out.println();
      String line;
      String bufferline="";
      while ((line = in.readLine()) != null &&
             !app.interrupted())
     {
       
        bufferline=bufferline + line;
        outputArea.appendText(line + "\n");
      }

      System.out.println("bufferline: --" + bufferline);
      summaryresult = parseHtml(bufferline,0);
     
      summaryArea.appendText(summaryresult.getTitle());
      
      
      if (app.interrupted())
        outputArea.appendText("---- Download " +
                              "Interrupted ----");
    } catch(Exception e) {
      outputArea.setText("Error: " + e);
    }
  }


private summaryResult parseHtml(String htmlPage, int beginindex)
{
   summaryResult summaryresult;
   String title = null;
   String paragraph = null;

   int endindex = 0;

   // find title
   System.out.println("parse HTML");


   endindex = htmlPage.indexOf("<title>");
   //if small character
   if(endindex >= 0)
   {
     beginindex = endindex + 7;
     endindex = htmlPage.indexOf("</title>", beginindex);
   }
   else   // large character
   { endindex = 0;
     endindex = htmlPage.indexOf("<TITLE>");
     beginindex = endindex + 7;
     endindex = htmlPage.indexOf("</TITLE>", beginindex);
    }
     
        
   title = htmlPage.substring(beginindex, endindex);
  //   beginindex = endindex + 8;
  
   System.out.println("title:---" + title);
  
   summaryresult = new summaryResult(title); 
   return summaryresult;

}


  private boolean checkHost(String host) {
    try {
      InetAddress.getByName(host);
      return(true);
    } catch(UnknownHostException uhe) {
      outputArea.setText("Bogus host: " + host);
      return(false);
    }
  }
}