package com.xcong.excoin.modules.okxNewPrice.utils;

import cn.hutool.core.util.StrUtil;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

/**
 * @author Administrator
 */
public class WsParamBuild {

    public static String getOrderNum(String prefix) {
        SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
        String dd=df.format(new Date());
        if (StrUtil.isNotBlank(prefix)) {
            return prefix+dd+getRandomNum(5);
        }
        return dd+getRandomNum(5);
    }

    public static String getRandomNum(int length) {
        String str = "0123456789";
        Random random = new Random();
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; ++i) {
            int number = random.nextInt(str.length());
            sb.append(str.charAt(number));
        }

        return sb.toString();
    }

    public static JSONObject buildJsonObject(String connId, String option, JSONArray argsArray) {
        JSONObject jsonObject = new JSONObject();
        if (StrUtil.isNotEmpty(connId)){
            jsonObject.put("id", connId);
        }
        jsonObject.put("op", option);
        jsonObject.put("args", argsArray);
        return jsonObject;
    }


    /**
     * 计算购买合约的数量
     *
     * USDT 币本位合约
     * 公式：张数 = 保证金 / (面值 * 标记价格 / 杠杆倍数)
     *
     * @param margin 用户的保证金金额
     * @param leverage 杠杆倍数
     * @param faceValue 合约面值
     * @param markPrice 标记价格
     * @param minLotSz 最小下单精度
     * @return 返回用户可以购买的合约数量
     */
    public static BigDecimal buyCnt(BigDecimal margin, BigDecimal leverage, BigDecimal faceValue, BigDecimal markPrice, int minLotSz) {
        if (margin.compareTo(BigDecimal.ZERO) <= 0 ||
                leverage.compareTo(BigDecimal.ZERO) <= 0 ||
                faceValue.compareTo(BigDecimal.ZERO) <= 0 ||
                markPrice.compareTo(BigDecimal.ZERO) <= 0) {
            return BigDecimal.ZERO;
        }

        BigDecimal divisor = markPrice.divide(leverage, 10, BigDecimal.ROUND_DOWN);
        BigDecimal denominator = faceValue.multiply(divisor);
        return margin.divide(denominator, minLotSz, BigDecimal.ROUND_DOWN);
    }
}