/**
 *
 * Copyright the original author or authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jivesoftware.smackx.jingleold.nat;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.StringTokenizer;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * A very Simple HTTP Server.
 */
@SuppressWarnings("UnusedVariable")
public class HttpServer {

    private static final Logger LOGGER = Logger.getLogger(HttpServer.class.getName());

    public HttpServer(int port) {
        ServerSocket server_socket;

        try {

            server_socket = new ServerSocket(port);
            LOGGER.fine("httpServer running on port " +
                    server_socket.getLocalPort());

            while (true) {
                Socket socket = server_socket.accept();
                LOGGER.fine("New connection accepted " +
                        socket.getInetAddress() +
                        ":" + socket.getPort());

                try {
                    HttpRequestHandler request =
                            new HttpRequestHandler(socket);

                    Thread thread = new Thread(request);

                    thread.start();
                }
                catch (Exception e) {
                    LOGGER.log(Level.FINE, "Exception", e);
                }
            }
        }

        catch (IOException e) {
            LOGGER.log(Level.FINE, "Exception", e);
        }

    }

    public static void main(String[] args) {
        HttpServer httpServer = new HttpServer(Integer.parseInt(args[0]));
    }

    static class HttpRequestHandler implements Runnable {

        static final String CRLF = "\r\n";
        Socket socket;
        InputStream input;
        OutputStream output;
        BufferedReader br;

        HttpRequestHandler(Socket socket) throws Exception {
            this.socket = socket;
            this.input = socket.getInputStream();
            this.output = socket.getOutputStream();
            this.br = new BufferedReader(new InputStreamReader(socket.getInputStream(), StandardCharsets.UTF_8));
        }

        @Override
        public void run() {
            try {
                processRequest();
            }
            catch (Exception e) {
                LOGGER.log(Level.WARNING, "exception", e);
            }
        }

        private void processRequest() throws Exception {
            while (true) {

                String headerLine = br.readLine();
                LOGGER.fine(headerLine);
                if (headerLine.equals(CRLF) || headerLine.equals("")) break;

                StringTokenizer s = new StringTokenizer(headerLine);
                String temp = s.nextToken();

                if (temp.equals("GET")) {

                    String serverLine = "Server: Simple httpServer";
                    String contentTypeLine = "text";
                    String entityBody = "";
                    String contentLengthLine;
                    String statusLine = "HTTP/1.0 200 OK" + CRLF;
                    contentLengthLine = "Content-Length: "
                            + entityBody.length() + CRLF;
                    contentTypeLine = "text/html";

                    output.write(statusLine.getBytes(StandardCharsets.UTF_8));

                    output.write(serverLine.getBytes(StandardCharsets.UTF_8));

                    output.write(contentTypeLine.getBytes(StandardCharsets.UTF_8));
                    output.write(contentLengthLine.getBytes(StandardCharsets.UTF_8));

                    output.write(CRLF.getBytes(StandardCharsets.UTF_8));

                    output.write(entityBody.getBytes(StandardCharsets.UTF_8));

                }
            }

            try {
                output.close();
                br.close();
                socket.close();
            }
            catch (Exception e) {
                // Do Nothing
                LOGGER.log(Level.WARNING, "exception", e);
            }
        }
    }
}