package com.handspeaker.network;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import org.json.JSONObject;

import android.app.Activity;
import android.content.Context;
import android.net.ConnectivityManager;
import android.os.Handler;
import android.util.Log;

/**
 * 
 * 用于封装&简化http通信
 * 
 */
public class PostRequest implements Runnable {
  
  private static final int NO_SERVER_ERROR=1000;
  //服务器地址
  public static final String URL = "fill your own url";
  //一些请求类型
  public final static String ADD = "/add";
  public final static String UPDATE = "/update";
  public final static String PING = "/ping";
  //一些参数
  private static int connectionTimeout = 60000;
  private static int socketTimeout = 60000;
  //类静态变量
  private static HttpClient httpClient=new DefaultHttpClient();
  private static ExecutorService executorService=Executors.newCachedThreadPool();
  private static Handler handler = new Handler();
  //变量
  private String strResult;
  private HttpPost httpPost;
  private HttpResponse httpResponse;
  private OnReceiveDataListener onReceiveDataListener;
  private int statusCode;

  /**
   * 构造函数，初始化一些可以重复使用的变量
   */
  public PostRequest() {
    strResult = null;
    httpResponse = null;
    httpPost = new HttpPost();
  }
  
  /**
   * 注册接收数据监听器
   * @param listener
   */
  public void setOnReceiveDataListener(OnReceiveDataListener listener) {
    onReceiveDataListener = listener;
  }

  /**
   * 根据不同的请求类型来初始化httppost
   * 
   * @param requestType
   *      请求类型
   * @param nameValuePairs
   *      需要传递的参数
   */
  public void iniRequest(String requestType, JSONObject jsonObject) {
    httpPost.addHeader("Content-Type", "text/json");
    httpPost.addHeader("charset", "UTF-8");

    httpPost.addHeader("Cache-Control", "no-cache");
    HttpParams httpParameters = httpPost.getParams();
    HttpConnectionParams.setConnectionTimeout(httpParameters,
        connectionTimeout);
    HttpConnectionParams.setSoTimeout(httpParameters, socketTimeout);
    httpPost.setParams(httpParameters);
    try {
      httpPost.setURI(new URI(URL + requestType));
      httpPost.setEntity(new StringEntity(jsonObject.toString(),
          HTTP.UTF_8));
    } catch (URISyntaxException e1) {
      e1.printStackTrace();
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    }
  }

  /**
   * 新开一个线程发送http请求
   */
  public void execute() {
    executorService.execute(this);
  }

  /**
   * 检测网络状况
   * 
   * @return true is available else false
   */
  public static boolean checkNetState(Activity activity) {
    ConnectivityManager connManager = (ConnectivityManager) activity
        .getSystemService(Context.CONNECTIVITY_SERVICE);
    if (connManager.getActiveNetworkInfo() != null) {
      return connManager.getActiveNetworkInfo().isAvailable();
    }
    return false;
  }

  /**
   * 发送http请求的具体执行代码
   */
  @Override
  public void run() {
    httpResponse = null;
    try {
      httpResponse = httpClient.execute(httpPost);
      strResult = EntityUtils.toString(httpResponse.getEntity());
    } catch (ClientProtocolException e1) {
      strResult = null;
      e1.printStackTrace();
    } catch (IOException e1) {
      strResult = null;
      e1.printStackTrace();
    } finally {
      if (httpResponse != null) {
        statusCode = httpResponse.getStatusLine().getStatusCode();
      }
      else
      {
        statusCode=NO_SERVER_ERROR;
      }
      if(onReceiveDataListener!=null)
      {
        //将注册的监听器的onReceiveData方法加入到消息队列中去执行
        handler.post(new Runnable() {
          @Override
          public void run() {
            onReceiveDataListener.onReceiveData(strResult, statusCode);
          }
        });
      }
    }
  }

  /**
   * 用于接收并处理http请求结果的监听器
   *
   */
  public interface OnReceiveDataListener {
    /**
     * the callback function for receiving the result data
     * from post request, and further processing will be done here
     * @param strResult the result in string style.
     * @param StatusCode the status of the post
     */
    public abstract void onReceiveData(String strResult,int StatusCode);
  }

}