package com.dsh.app.util.pay.wechat;


import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.*;


/*
 '微信支付服务器签名支付请求请求类
 '============================================================================
 'api说明：
 'init(app_id, app_secret, partner_key, app_key);
 '初始化函数，默认给一些参数赋值，如cmdno,date等。
 'setKey(key_)'设置商户密钥
 'getLasterrCode(),获取最后错误号
 'GetToken();获取Token
 'getTokenReal();Token过期后实时获取Token
 'createMd5Sign(signParams);生成Md5签名
 'genPackage(packageParams);获取package包
 'createSHA1Sign(signParams);创建签名SHA1
 'sendPrepay(packageParams);提交预支付
 'getDebugInfo(),获取debug信息
 '============================================================================
 '*/
public class RequestHandler {
//	/** Token获取网关地址地址 */
//	private String tokenUrl;
//	/** 预支付网关url地址 */
//	private String gateUrl;
	/** 查询支付通知网关URL */
	private String notifyUrl;
	/** 商户参数 */
	private String appid;
	private String appkey;
	private String partnerkey;
	private String appsecret;
	private String key;
	/** 请求的参数 */
	private SortedMap parameters;
	/** Token */
	private String Token;
	private String charset;
	/** debug信息 */
	private String debugInfo;
	private String last_errcode;

	private HttpServletRequest request;

	private HttpServletResponse response;

	/**
	 * 初始构造函数。
	 *
	 * @return
	 */
	public RequestHandler(HttpServletRequest request,
                          HttpServletResponse response) {
		this.last_errcode = "0";
		this.request = request;
		this.response = response;
		//this.charset = "GBK";
		this.charset = "UTF-8";
		this.parameters = new TreeMap();
		// 验证notify支付订单网关
		notifyUrl = "https://gw.tenpay.com/gateway/simpleverifynotifyid.xml";

	}

	/**
	 * 初始化函数。
	 */
	public void init(String app_id, String app_secret,	String partner_key) {
		this.last_errcode = "0";
		this.Token = "token_";
		this.debugInfo = "";
		this.appid = app_id;
		this.partnerkey = partner_key;
		this.appsecret = app_secret;
		this.key = partner_key;
	}

	public void init() {
	}

	/**
	 * 获取最后错误号
	 */
	public String getLasterrCode() {
		return last_errcode;
	}

//	/**
//	 *获取入口地址,不包含参数值
//	 */
//	public String getGateUrl() {
//		return gateUrl;
//	}

	/**
	 * 获取参数值
	 *
	 * @param parameter
	 *            参数名称
	 * @return String
	 */
	public String getParameter(String parameter) {
		String s = (String) this.parameters.get(parameter);
		return (null == s) ? "" : s;
	}


	 //设置密钥

	public void setKey(String key) {
		this.partnerkey = key;
	}
	//设置微信密钥
	public void  setAppKey(String key){
		this.appkey = key;
	}

	// 特殊字符处理
	public String UrlEncode(String src) throws UnsupportedEncodingException {
		return URLEncoder.encode(src, this.charset).replace("+", "%20");
	}

	// 获取package的签名包
	public String genPackage(SortedMap<String, String> packageParams)
			throws UnsupportedEncodingException {
		String sign = createSign(packageParams);

		StringBuffer sb = new StringBuffer();
		Set es = packageParams.entrySet();
		Iterator it = es.iterator();
		while (it.hasNext()) {
			Map.Entry entry = (Map.Entry) it.next();
			String k = (String) entry.getKey();
			String v = (String) entry.getValue();
			sb.append(k + "=" + UrlEncode(v) + "&");
		}

		// 去掉最后一个&
		String packageValue = sb.append("sign=" + sign).toString();
//		System.out.println("UrlEncode后 packageValue=" + packageValue);
		return packageValue;
	}

	/**
	 * 创建md5摘要,规则是:按参数名称a-z排序,遇到空值的参数不参加签名。
	 */
	public String createSign(SortedMap<String, String> packageParams) {
		StringBuffer sb = new StringBuffer();
		Set es = packageParams.entrySet();
		Iterator it = es.iterator();
		while (it.hasNext()) {
			Map.Entry entry = (Map.Entry) it.next();
			String k = (String) entry.getKey();
			String v = (String) entry.getValue();
			if (null != v && !"".equals(v) && !"sign".equals(k)
					&& !"key".equals(k)) {
				sb.append(k + "=" + v + "&");
			}
		}
		sb.append("key=" + this.getKey());
		String sign = WXMD5Util.MD5Encode(sb.toString(), this.charset)
				.toUpperCase();
		return sign;

	}
	/**
	 * 创建package签名
	 */
	public boolean createMd5Sign(String signParams) {
		StringBuffer sb = new StringBuffer();
		Set es = this.parameters.entrySet();
		Iterator it = es.iterator();
		while (it.hasNext()) {
			Map.Entry entry = (Map.Entry) it.next();
			String k = (String) entry.getKey();
			String v = (String) entry.getValue();
			if (!"sign".equals(k) && null != v && !"".equals(v)) {
				sb.append(k + "=" + v + "&");
			}
		}

		// 算出摘要
		String enc = getCharacterEncoding(this.request,
				this.response);
		String sign = WXMD5Util.MD5Encode(sb.toString(), enc).toLowerCase();

		String tenpaySign = this.getParameter("sign").toLowerCase();

		// debug信息
		this.setDebugInfo(sb.toString() + " => sign:" + sign + " tenpaySign:"
				+ tenpaySign);

		return tenpaySign.equals(sign);
	}



    //输出XML
	   public String parseXML() {
		   StringBuffer sb = new StringBuffer();
	       sb.append("<xml>");
	       Set es = this.parameters.entrySet();
	       Iterator it = es.iterator();
	       while(it.hasNext()) {
				Map.Entry entry = (Map.Entry)it.next();
				String k = (String)entry.getKey();
				String v = (String)entry.getValue();
				if(null != v && !"".equals(v) && !"appkey".equals(k)) {

					sb.append("<" + k +">" + getParameter(k) + "</" + k + ">\n");
				}
			}
	       sb.append("</xml>");
			return sb.toString();
		}

	/**
	 * 获取编码字符集
	 * @param request
	 * @param response
	 * @return String
	 */

	public static String getCharacterEncoding(HttpServletRequest request,
                                              HttpServletResponse response) {

		if(null == request || null == response) {
			return "gbk";
		}

		String enc = request.getCharacterEncoding();
		if(null == enc || "".equals(enc)) {
			enc = response.getCharacterEncoding();
		}

		if(null == enc || "".equals(enc)) {
			enc = "gbk";
		}

		return enc;
	}

	/**
	 * 设置debug信息
	 */
	protected void setDebugInfo(String debugInfo) {
		this.debugInfo = debugInfo;
	}
	public void setPartnerkey(String partnerkey) {
		this.partnerkey = partnerkey;
	}
	public String getDebugInfo() {
		return debugInfo;
	}
	public String getKey() {
		return key;
	}

}