import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * TCP服務器端,單例模式
 * @author xiang
 *
 */
public class TCPServer implements Runnable {
  private static final Logger logger = LoggerFactory.getLogger(TCPServer.class);
  //成員變量/
  private static TCPServer serverInstance;      
  private static Map<String, SocketThread> socketMaps = new HashMap<String,SocketThread>();　　　　　　　　//每個客戶端連接時都會新建一個SocketThread與之對應  private static ServerSocket serverSocket;          //服務器套接字
  private static int serPort = 9999;              //服務器端口號
  private static boolean flag;                //服務器狀態標志
  private static final int BUFFER_SIZE = 512;          //數據接收字符數組大小
  
  //構造函數/
  private TCPServer() {
    
  }
  
  /**
   * 獲取實例
   * @return TCPServer實例serverInstance
   */
  public static TCPServer getServerInstance(){
    if(serverInstance==null)
      serverInstance = new TCPServer();
    return serverInstance;
  }
  
  /**
   * 開啟服務器
   * @throws IOException
   */
  public void openTCPServer() throws IOException{    if(serverSocket==null || serverSocket.isClosed()){
      serverSocket = new ServerSocket(serPort);
      flag = true;
    }
  }
  
  /**
   * 關閉服務器
   * @throws IOException 
   */
  public void closeTCPServer() throws IOException{
    flag = false;   if(serverSocket!=null)
      serverSocket.close();
    /*for (Map.Entry<String, SocketThread> entry : socketMaps.entrySet()) { 
       System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue());     
    } */ 
    for (SocketThread value : socketMaps.values()) 
      value.closeConnect();
    socketMaps.clear();    
  }
  
  /**
   * 服務器向客戶端發送數據
   * @param bytes[]:待發送的字符數組
   * @param key 客戶端的key,為空或""時表示數據群發
   * @throws IOException 
   */
  public void sendMessage(String key,byte[] msgBytes){
    if(key==null||key.equals("")){
      for (SocketThread value : socketMaps.values()) 
        value.sendMassage(msgBytes);
    }else{
      SocketThread thread = socketMaps.get(key);
      if(thread!=null)
        thread.sendMassage(msgBytes);
    }
  }
  
  /**
   * 服務器向客戶端發送數據
   * @param key 客戶端的key,為空或""時表示數據群發
   * @param msgStr:待發送的字符串
   * @throws IOException 
   */
  public void sendMessage(String key,String msgStr){   byte[] sendByte = msgStr.getBytes();
    if(key==null||key.equals("")){
      for (SocketThread value : socketMaps.values()) 
        value.sendMassage(sendByte);
    }else{
      SocketThread thread = socketMaps.get(key);
      if(thread!=null)
        thread.sendMassage(sendByte);
    }
  }
  
  @Override
  public void run() {
    logger.info("服務器線程已經啟動");   while(true){
      try {
        while(flag){
          logger.info("服務器線程在監聽狀態中");
          Socket socket = serverSocket.accept();
          String key = socket.getRemoteSocketAddress().toString();
          SocketThread thread = new SocketThread(socket,key);
          thread.start();
          socketMaps.put(key, thread);          
          logger.info("有客戶端連接："+key);
        }        
      } catch (Exception e) {
        e.printStackTrace();        
      } 
    }
  }     
  
  /**
   * 處理連接后的數據接收請求內部類
   * @author xiang
   *
   */
  private class SocketThread extends Thread{
    private Socket socket;
    private String key;
    private OutputStream out;
    private InputStream in;
    
    //構造函數
    public SocketThread(Socket socket,String key) {
      this.socket = socket;
      this.key = key;
    }
    
    /**
     * 發送數據
     * @param bytes
     * @throws IOException 
     */
    public void sendMassage(byte[] bytes){
      try {
        if(out==null)
          out = socket.getOutputStream();
        out.write(bytes);
      } catch (Exception e) {
        e.printStackTrace();
        try {
          closeConnect();
        } catch (IOException e1) {
          e1.printStackTrace();
        }
        socketMaps.remove(key);        
      } 
    }

    /**
     * 關閉連接，釋放資源
     * @throws IOException 
     */
    public void closeConnect() throws IOException{
      if(out!=null)  out.close();
      if(in!=null)  in.close();
      if(socket!=null && socket.isConnected())  socket.close();
    }
    
    @Override
    public void run() {
      byte[] receivBuf = new byte[BUFFER_SIZE];
      int recvMsgSize;
      try {
        in = socket.getInputStream();
        out = socket.getOutputStream();
        while ((recvMsgSize = in.read(receivBuf)) != -1) {
          String receivedData = new String(receivBuf, 0, recvMsgSize);
          System.out.println("Reverve form[port" + socket.getPort() + "]:" + receivedData);
          System.out.println("Now the size of socketMaps is" + socketMaps.size());
          /**************************************************************
           * 
           * 接收數據后的處理過程
           * 
           **************************************************************/
        }
        // response to client
        byte[] sendByte = "The Server has received".getBytes();
        // out.write(sendByte, 0, sendByte.length);
        out.write(sendByte);
        System.out.println("To Cliect[port:" + socket.getPort() + "] 回復客戶端的消息發送成功");
        closeConnect();
        socketMaps.remove(key);        
      } catch (Exception e) {
        e.printStackTrace();
        try {
          closeConnect();
        } catch (IOException e1) {
          e1.printStackTrace();
        }
      }
    }
    
    //////////////
    public int getport(){
      return socket.getPort();
    }
  }
  //. end SocketThread  
}