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

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

public class HttpClient extends NetworkClient {
  private String requestLine;
  private String[] requestHeaders;
  private TextArea outputArea;
  private Interruptable app;
  
  public HttpClient(String host,
                    int port,
                    String requestLine,
                    String[] requestHeaders,
                    TextArea outputArea,
                    Interruptable app) {
    super(host, port);
    this.requestLine = requestLine;
    this.requestHeaders = requestHeaders;
    this.outputArea = outputArea;
    this.app = app;
    if (checkHost(host))
      connect();
  }

  protected void handleConnection(Socket uriSocket)
      throws IOException {
    try {
      SocketUtil s = new SocketUtil(uriSocket);
      PrintStream out = s.getPrintStream();
      DataInputStream in = s.getDataStream();
      outputArea.setText("");
      out.println(requestLine);
      for(int i=0; i<requestHeaders.length; i++) {
        if (requestHeaders[i] == null)
          break;
        else
          out.println(requestHeaders[i]);
      }
      out.println();
      String line;
      while ((line = in.readLine()) != null &&
             !app.interrupted())
        outputArea.appendText(line + "\n");
      if (app.interrupted())
        outputArea.appendText("---- Download " +
                              "Interrupted ----");
    } catch(Exception e) {
      outputArea.setText("Error: " + e);
    }
  }

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