/**

  * 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.ByteArrayInputStream;

 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.Locale;

 import java.util.Locale;

 import java.util.logging.Logger;

 import javax.tools.Diagnostic;

 import javax.tools.JavaFileObject;

 import org.apidesign.vm4brwsr.Bck2Brwsr;

 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.JSONArray;

 import org.json.JSONObject;

 import org.json.JSONStringer;

 import org.json.JSONTokener;

 /**

  *

  * @author phrebejk

  */

 public class Dew extends HttpHandler implements Bck2Brwsr.Resources {

     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 {

                 JSONArray errors = new JSONArray();

                 for (Diagnostic<? extends JavaFileObject> d : err) {

                     JSONObject e = new JSONObject();

                     e.put("col", d.getColumnNumber());

                     e.put("line", d.getLineNumber());

                     e.put("kind", d.getKind().toString());

                     e.put("msg", d.getMessage(Locale.ENGLISH));

                     errors.put(e);

                 }

                 errors.write(response.getWriter());                

                 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.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);

         }

     }

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

         for (;;) {

             int ch = is.read();

             if (ch == -1) {

                 break;

             }

             os.write(ch);            

         }

     }

     @Override

     public InputStream get(String r) throws IOException {

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

         return arr == null ? null : new ByteArrayInputStream(arr);

     }

 }