package com.ruoyi.system.utils;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.concurrent.ThreadLocalRandom;

/**
 * 订单号生成器
 *
 * @author mitao
 * @since 2025-12-16
 */
public class OrderCodeGenerator {

    private static final DateTimeFormatter ORDER_CODE_FORMATTER = DateTimeFormatter.ofPattern("yyyyMMddHHmmss");

    /**
     * 大礼包订单前缀
     */
    public static final String PREFIX_BIG_GIFT = "BG";

    /**
     * 大礼包合并支付订单前缀
     */
    public static final String PREFIX_BIG_GIFT_PAY = "BGP";

    /**
     * 实物商品订单前缀
     */
    public static final String PREFIX_PHYSICAL_GOODS = "PG";

    /**
     * 大礼包尾款支付订单前缀
     */
    public static final String PREFIX_BIG_GIFT_FINAL = "BGF";

    private OrderCodeGenerator() {
        // 私有构造函数，防止实例化
    }

    /**
     * 生成订单号
     *
     * @param prefix 订单号前缀
     * @return 订单号（格式：前缀 + yyyyMMddHHmmss + 4位随机数）
     */
    public static String generate(String prefix) {
        String timestamp = LocalDateTime.now().format(ORDER_CODE_FORMATTER);
        int randomNum = ThreadLocalRandom.current().nextInt(1000, 10000);
        return prefix + timestamp + randomNum;
    }

    /**
     * 生成大礼包订单号
     *
     * @return 大礼包订单号
     */
    public static String generateBigGiftOrderCode() {
        return generate(PREFIX_BIG_GIFT);
    }

    /**
     * 生成大礼包合并支付订单号
     *
     * @return 大礼包合并支付订单号
     */
    public static String generateBigGiftPayOrderCode() {
        return generate(PREFIX_BIG_GIFT_PAY);
    }

    /**
     * 生成实物商品订单号
     *
     * @return 实物商品订单号
     */
    public static String generatePhysicalGoodsOrderCode() {
        return generate(PREFIX_PHYSICAL_GOODS);
    }

    /**
     * 生成大礼包尾款支付订单号
     *
     * @return 大礼包尾款支付订单号
     */
    public static String generateBigGiftFinalPayOrderCode() {
        return generate(PREFIX_BIG_GIFT_FINAL);
    }
}