package com.ljsd.controller;

import com.google.gson.Gson;
import com.ljsd.channel.Mock361YXSDK;
import com.ljsd.channel.MockQuickSDK;
import com.ljsd.pojo.ResMsg;
import com.ljsd.util.BaseGlobal;
import com.ljsd.util.StringUtils;
import com.ljsd.util.TimeUtil;
import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.security.SecureRandom;
import java.util.HashMap;
import java.util.Map;

public class CreateOrderController extends HttpServlet {
    private static final Logger LOGGER = LoggerFactory.getLogger(CreateOrderController.class);
    private static Gson gson = new Gson();
    private final static String _COLLECTION_PAY = "pay";

    public CreateOrderController() {
        super();
    }

    public void destroy() {
        super.destroy();
    }
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        this.doPost(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/json; charset=utf-8");
        // /CreatOrder?openid=test001&uid=10000026&region=10001&channel=Android_QuickGame&pay_item=4000&price=1800
        String uid = request.getParameter("uid");
        String openId = request.getParameter("openid");
        String serverId = request.getParameter("region");
        String channel = request.getParameter("channel");
        String payItem = request.getParameter("pay_item");
        String price = request.getParameter("price");
        LOGGER.info("CreateOrderController request = {}", request);
        ResMsg resMsg = new ResMsg();
        resMsg.setCode(1);
        String orderId = generateOrderNumber(uid);

        DBObject payInfo = new BasicDBObject();
        payInfo.put("uid", uid);
        payInfo.put("pay_item", payItem);
        payInfo.put("region", serverId);
        payInfo.put("channel", channel);
        payInfo.put("cporderId", orderId);
        payInfo.put("openid", openId);
        payInfo.put("creattime", String.valueOf(TimeUtil.getTimeNow()));
        payInfo.put("money", Integer.valueOf(price));
        BaseGlobal.getInstance().mongoDBPool.save(_COLLECTION_PAY, payInfo);

        Map<String,String> parms = new HashMap<>();
        parms.put("orderId", orderId);
        resMsg.setParms(parms);
        resMsg.setParms(parms);
        resMsg.setCode(1);
        try (PrintWriter out = response.getWriter();){
            resMsg.setCode(0);
            out.print(gson.toJson(resMsg));
        }catch (Exception e){
            e.printStackTrace();
        }
    }


    // 订单号规则：玩家uid-6位随机数-校验码
    // 订单号各部分长度（可根据需求调整）
    private static final int RANDOM_LENGTH = 6;      // 随机数长度
    /**
     * 生成唯一订单号
     * @param userId 用户ID（需为正整数）
     * @return 订单号（格式：时间戳-用户ID-随机数-校验码）
     */
    public static String generateOrderNumber(String userId) {
        // 1. 生成6位随机数（000000-999999）
        String randomPart = generateRandomString(RANDOM_LENGTH);

        // 2. 计算校验码（简单示例：前几位的和模100）
        String checksum = calculateChecksum(userId + randomPart);

        // 3. 拼接最终订单号
        return String.join("-", userId, randomPart, checksum);
    }

    /**
     * 生成指定长度的随机数字字符串
     */
    private static String generateRandomString(int length) {
        SecureRandom random = new SecureRandom(); // 更安全的随机数生成器
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            sb.append(random.nextInt(10)); // 0-9随机数
        }
        return sb.toString();
    }

    /**
     * 计算简单校验码（示例：前N位之和模100）
     * @param source 源字符串（如时间戳+用户ID+随机数）
     * @return 校验码（2位数字）
     */
    private static String calculateChecksum(String source) {
        int sum = 0;
        for (char c : source.toCharArray()) {
            if (Character.isDigit(c)) {
                sum += Character.getNumericValue(c);
            }
        }
        int checksum = sum % 100; // 模100得到两位数
        return String.format("%02d", checksum);
    }
}