package cn.ksource.web.controller.wechat.menu.util;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.ConnectException;
import java.net.URL;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;

import cn.ksource.web.controller.wechat.menu.domain.AccessToken;
import cn.ksource.web.controller.wechat.menu.domain.Menu;


import net.sf.json.JSONException;
import net.sf.json.JSONObject;

/** 
 * 公众平台通用接口工具类 
 *  
 * @author jiangxiaolei 
 * @date 2013-10-15 
 */  
public class WeixinUtil {
	
	// 获取access_token的接口地址（GET） 限200（次/天）  
	public final static String access_token_url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET";  
    // 菜单创建（POST） 限100（次/天）  
    public static String menu_create_url = "https://api.weixin.qq.com/cgi-bin/menu/create?access_token=ACCESS_TOKEN";
    
    //关注者列表地址
    public static String attention_people_url = "https://api.weixin.qq.com/cgi-bin/user/get?access_token=ACCESS_TOKEN&next_openid=NEXT_OPENID";
    
	/** 
     * 发起https请求并获取结果 
     *  
     * @param requestUrl 请求地址 
     * @param requestMethod 请求方式（GET、POST） 
     * @param outputStr 提交的数据 
     * @return JSONObject(通过JSONObject.get(key)的方式获取json对象的属性值) 
     */  
    public static JSONObject httpRequest(String requestUrl, String requestMethod, String outputStr) {  
        JSONObject jsonObject = null;  
        StringBuffer buffer = new StringBuffer();  
        try {  
            // 创建SSLContext对象，并使用我们指定的信任管理器初始化  
            TrustManager[] tm = { new MyX509TrustManager() };  
            SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");  
            sslContext.init(null, tm, new java.security.SecureRandom());  
            // 从上述SSLContext对象中得到SSLSocketFactory对象  
            SSLSocketFactory ssf = sslContext.getSocketFactory();  
  
            URL url = new URL(requestUrl);  
            HttpsURLConnection httpUrlConn = (HttpsURLConnection) url.openConnection();  
            httpUrlConn.setSSLSocketFactory(ssf);  
  
            httpUrlConn.setDoOutput(true);  
            httpUrlConn.setDoInput(true);  
            httpUrlConn.setUseCaches(false);  
            // 设置请求方式（GET/POST）  
            httpUrlConn.setRequestMethod(requestMethod);  
  
            if ("GET".equalsIgnoreCase(requestMethod))  
                httpUrlConn.connect();  
  
            // 当有数据需要提交时  
            if (null != outputStr) {  
                OutputStream outputStream = httpUrlConn.getOutputStream();  
                // 注意编码格式，防止中文乱码  
                outputStream.write(outputStr.getBytes("UTF-8"));  
                outputStream.close();  
            }  
  
            // 将返回的输入流转换成字符串  
            InputStream inputStream = httpUrlConn.getInputStream();  
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");  
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);  
  
            String str = null;  
            while ((str = bufferedReader.readLine()) != null) {  
                buffer.append(str);  
            }  
            bufferedReader.close();  
            inputStreamReader.close();  
            // 释放资源  
            inputStream.close();  
            inputStream = null;  
            httpUrlConn.disconnect();  
            jsonObject = JSONObject.fromObject(buffer.toString());  
        } catch (ConnectException ce) {  
            System.out.println("Weixin server connection timed out.");  
        } catch (Exception e) {  
        	e.printStackTrace();  
        }  
        return jsonObject;  
    } 
    
    
    
    
    /** 
     * 获取关注者信息
     *  
     * @param token 
     * @return 
     */  
    public static int getAttentionPeople(String token) {  
        int total = 0;
        String requestUrl = attention_people_url.replace("ACCESS_TOKEN", token).replace("NEXT_OPENID", "");  
        JSONObject jsonObject = httpRequest(requestUrl, "GET", null);  
        //只查询关注总数，没有查询列表信息，有待扩展
        if (null != jsonObject) {  
            try {  
                total = jsonObject.getInt("total");  
            } catch (JSONException e) {  
            	// 获取关注者信息失败  
                System.out.println("获取关注者失败errcode:{"+jsonObject.getInt("errcode")+"} errmsg:{"+jsonObject.getString("errmsg")+"}");
            }  
        }  
        return total;  
    }
    
      
    /** 
     * 获取access_token 
     *  
     * @param appid 凭证 
     * @param appsecret 密钥 
     * @return 
     */  
    public static AccessToken getAccessToken(String appid, String appsecret) {  
        AccessToken accessToken = null;  
      
        String requestUrl = access_token_url.replace("APPID", appid).replace("APPSECRET", appsecret);  
        JSONObject jsonObject = httpRequest(requestUrl, "GET", null);  
        // 如果请求成功  
        if (null != jsonObject) {  
            try {  
                accessToken = new AccessToken();  
                accessToken.setToken(jsonObject.getString("access_token"));  
                accessToken.setExpiresIn(jsonObject.getInt("expires_in"));  
            } catch (JSONException e) {  
            	// 获取token失败  
                accessToken = null;
                System.out.println("获取token失败errcode:{"+jsonObject.getInt("errcode")+"} errmsg:{"+jsonObject.getString("errmsg")+"}");
            }  
        }  
        return accessToken;  
    }
    
    
    
    /** 
     * 创建菜单 
     *  
     * @param menu 菜单实例 
     * @param accessToken 有效的access_token 
     * @return 0表示成功，其他值表示失败 
     */  
    public static int createMenu(Menu menu, String accessToken) {  
        int result = 0;  
      
        // 拼装创建菜单的url  
        String url = menu_create_url.replace("ACCESS_TOKEN", accessToken);  
        // 将菜单对象转换成json字符串  
        String jsonMenu = JSONObject.fromObject(menu).toString();  
        // 调用接口创建菜单  
        JSONObject jsonObject = httpRequest(url, "POST", jsonMenu);  
      
        if (null != jsonObject) {  
            if (0 != jsonObject.getInt("errcode")) {  
                result = jsonObject.getInt("errcode");  
                System.out.println("创建菜单失败errcode:{"+jsonObject.getInt("errcode")+"} errmsg:{"+jsonObject.getString("errmsg")+"}");
            }  
        }  
      
        return result;  
    }
}