package com.tourguide.common.huifu.biz;

import com.huifu.bspay.sdk.opps.core.BasePay;
import com.huifu.bspay.sdk.opps.core.config.MerConfig;
import com.tourguide.common.huifu.properties.HuiFuProperties;

import java.security.SecureRandom;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/**
 * 斗拱请求公共能力。
 *
 * 备注：集中处理 SDK 初始化、日期和流水号生成，避免各业务类重复拼商户配置和随机串。
 */
final class DouGongRequestSupport {
    private static final DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ofPattern("yyyyMMdd");
    private static final DateTimeFormatter SEQ_TIME_FORMATTER = DateTimeFormatter.ofPattern("yyyyMMddHHmmssSSS");
    private static final SecureRandom RANDOM = new SecureRandom();
    private static final char[] ALPHANUMERIC = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".toCharArray();

    private DouGongRequestSupport() {}

    static void initBasePay(HuiFuProperties properties) throws Exception {
        // 备注：斗拱 SDK 使用全局 BasePay 配置，所有接口调用前都要用当前环境配置初始化一次。
        MerConfig merConfig = new MerConfig();
        merConfig.setProcutId(properties.getProductId());
        merConfig.setSysId(properties.getSysId());
        merConfig.setRsaPrivateKey(properties.getRsaPrivateKey());
        merConfig.setRsaPublicKey(properties.getRsaPublicKey());
        BasePay.initWithMerConfig(merConfig);
    }

    static String todayForHuiFu() {
        return LocalDate.now().format(DATE_FORMATTER);
    }

    static String generateForHuiFu() {
        return LocalDateTime.now().format(SEQ_TIME_FORMATTER) + randomNumber(6);
    }

    static String generateForHuiFu(String prefix) {
        return prefix + generateForHuiFu();
    }

    static String randomNumber(int length) {
        StringBuilder builder = new StringBuilder(length);
        for (int index = 0; index < length; index++) {
            builder.append(RANDOM.nextInt(10));
        }
        return builder.toString();
    }

    static String randomString(int length) {
        StringBuilder builder = new StringBuilder(length);
        for (int index = 0; index < length; index++) {
            builder.append(ALPHANUMERIC[RANDOM.nextInt(ALPHANUMERIC.length)]);
        }
        return builder.toString();
    }
}