package com.guo.learningprogresstracker.utils;

import lombok.RequiredArgsConstructor;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * 用于生成编码的工具
 */
@RequiredArgsConstructor
public class GenerateNumTool {
    private static int getNextSequence() {
        long timestamp = System.currentTimeMillis();
        return (int) (timestamp % 1_000_000);
    }

    /**
     * 生成以prefix开头separator分割的编码
     * 例如：PREFIX—20240711-423468
     * @param prefix
     * @param separator
     * @return
     */
    public static String generateNum(String prefix, String separator) {
        String currentDate = new SimpleDateFormat("yyyyMMdd").format(new Date());
        int sequence = getNextSequence();
        return prefix + separator + currentDate + separator + sequence;
    }

    public static String generateNum(String prefix) {
        String separator = "-";
        String currentDate = new SimpleDateFormat("yyyyMMdd").format(new Date());
        int sequence = getNextSequence();
        return prefix + separator + currentDate + separator + sequence;
    }
}