package com.editev.chess;

import java.io.*;

import javax.servlet.*; 
import javax.servlet.http.*;
import com.editev.chess.GameHTML;
import com.editev.chess.printer.PagePrinter;
import com.editev.chess.printer.Printer;
import com.editev.util.Enum;

/** This servlet will display any legal game of chess. <BR> <BR>
 *  
 *  the following HTML parameters are used: <BR> <BR>
 *  
 *    moves   has the list of moves so far separated by commas. <BR>
 *    target   contains the first half of the move if any. <BR>
 *    refresh has a refresh parameter that periodically refreshes the game with a random move. <BR> <BR>
 *
 *  @see   The source is <a href="ChessServlet.java">here</a> <br>
 *         and you can see a demo <a href="http://editev.com/servlet/chess">here</a>. 
 */
public class ChessServlet extends HttpServlet {
    public static Printer pagePrinter = new PagePrinter();

    /** Responds to http GET requests as a good HttpServlet should. */
    public void doGet( HttpServletRequest req, HttpServletResponse res ) throws ServletException, IOException {
    	res.setContentType("text/html");        // html description of the board.
    	System.out.println(  );
    	
    	/*
    	PrintStream out = new PrintStream(      // buffer the output stream for better performance
    	    new BufferedOutputStream(           // since most of the outputs are quite short.
    	        res.getOutputStream() 
    	    ) 
    	);
        */
        boolean isLynx        = req.getHeader( "User-Agent" ).startsWith( "Lynx" );
        boolean hasJavascript = false;//!isLynx;
        boolean hasStyles     = !isLynx;
        
        int refresh = com.editev.chess.printer.RefreshPrinter.NONE;
        String refStr = req.getParameter( "refresh" );
        
        if (refStr != null) {
       	    refresh = 10;                                   // refresh period in seconds.
    	    try { refresh = Integer.parseInt( refStr ); } catch (Exception e) {}
        }

        StringBuffer result = new StringBuffer();
        
        GameHTML game = new GameHTML(                   // create a new game
            "chess",
            //"http://tom.ax.to/servlet/chess",
            req.getParameter( "moves" ),                // the list of moves already made
            req.getParameter( "target" ),                // and a start move if this is the second half.
            isLynx,
            hasJavascript,
            hasStyles,
            refresh,
            result                                  // to the following output.
        );
        
        pagePrinter.print( game );                  // print the whole HTML page.
        
        res.getOutputStream().print( result.toString() );        
    	res.getOutputStream().close();                                                    // and flush the output, we're finished.
    }

    /** Responds to "post" requests in the same way as "get" requests. */
    public void doPost( HttpServletRequest req, HttpServletResponse res ) throws ServletException, IOException  { doGet( req, res ); }

    /** Describes this servlet with a String. */
    public String getServletInfo()                                                                              { return "a few random chess games."; }
}