/**

  * Back 2 Browser Bytecode Translator

  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  *

  * This program is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, version 2 of the License.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with this program. Look for COPYING file in the top folder.

  * If not, see http://opensource.org/licenses/GPL-2.0.

  */

 package org.apidesign.bck2brwsr.dew;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.InputStreamReader;

 import java.io.OutputStream;

 import java.io.Writer;

 import java.util.List;

 import java.util.logging.Logger;

 import javax.tools.Diagnostic;

 import javax.tools.JavaFileObject;

 import org.glassfish.grizzly.http.Method;

 import org.glassfish.grizzly.http.server.HttpHandler;

 import org.glassfish.grizzly.http.server.Request;

 import org.glassfish.grizzly.http.server.Response;

 import org.glassfish.grizzly.http.util.HttpStatus;

 import org.json.JSONObject;

 import org.json.JSONTokener;

 /**

  *

  * @author phrebejk

  */

 public class Dew extends HttpHandler {

     private String html = "";

     private Compile data;

     @Override

     public void service(Request request, Response response) throws Exception {

         if ( request.getMethod() == Method.POST ) {

             InputStream is = request.getInputStream();

             JSONTokener tok = new JSONTokener(new InputStreamReader(is));

             JSONObject obj = new JSONObject(tok);

             String tmpHtml = obj.getString("html");

             String tmpJava = obj.getString("java");

             Compile res = Compile.create(tmpHtml, tmpJava);

             List<Diagnostic<? extends JavaFileObject>> err = res.getErrors();

             if (err.isEmpty()) {

                 data = res;

                 html = tmpHtml;

                 response.getOutputStream().write("[]".getBytes());

                 response.setStatus(HttpStatus.OK_200);

             } else {

                 response.getOutputStream().write(("[errors:'" + err + "']").getBytes());

                 response.setStatus(HttpStatus.PRECONDITION_FAILED_412);

             }

             return;

         }

         String r = request.getHttpHandlerPath();

         if (r == null || r.equals("/")) {

             r = "index.html";

         }

         if (r.equals("/result.html")) {

             response.setContentType("text/html");

             response.getOutputBuffer().write(html);

             response.setStatus(HttpStatus.OK_200);

             return;

         }

         if (r.startsWith("/")) {

             r = r.substring(1);

         }

         if (r.startsWith("classes/")) {

             r = r.substring(8);

             byte[] arr = data == null ? null : data.get(r);

             if (arr == null) {

                 response.setError();

                 response.setDetailMessage("No data for " + r + " yet!");

                 return;

             }

             try (Writer w = response.getWriter()) {

                 response.setContentType("text/javascript");

                 w.append("[");

                 for (int i = 0; i < arr.length; i++) {

                     int b = arr[i];

                     if (b == -1) {

                         break;

                     }

                     if (i > 0) {

                         w.append(", ");

                     }

                     if (i % 20 == 0) {

                         w.write("\n");

                     }

                     if (b > 127) {

                         b = b - 256;

                     }

                     w.append(Integer.toString(b));

                 }

                 w.append("\n]");

             }

             return;

         }

         if (r.endsWith(".html") || r.endsWith(".xhtml")) {

             response.setContentType("text/html");

         }

         OutputStream os = response.getOutputStream();

         try (InputStream is = Dew.class.getResourceAsStream(r) ) {

             copyStream(is, os, request.getRequestURL().toString() );

         } catch (IOException ex) {

             response.setDetailMessage(ex.getLocalizedMessage());

             response.setError();

             response.setStatus(404);

         }

     }

     private static final Logger LOG = Logger.getLogger(Dew.class.getName());

     static void copyStream(InputStream is, OutputStream os, String baseURL) throws IOException {

         for (;;) {

             int ch = is.read();

             if (ch == -1) {

                 break;

             }

             os.write(ch);            

         }

     }

 }