package com.webmanage.service.impl;

import com.webmanage.service.OrderNoService;
import com.webmanage.util.SnowflakeIdWorker;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/**
 * 订单编号服务实现
 */
@Service
public class OrderNoServiceImpl implements OrderNoService {

    @Value("${snowflake.worker-id:1}")
    private long workerId;

    @Value("${snowflake.datacenter-id:1}")
    private long datacenterId;

    @Value("${snowflake.twepoch-ms:1577808000000}") // 2020-01-01 00:00:00
    private long twepochMs;

    private SnowflakeIdWorker idWorker;

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

    @PostConstruct
    public void init() {
        this.idWorker = new SnowflakeIdWorker(workerId, datacenterId, twepochMs);
    }

    @Override
    public String generateOrderNo() {
        long id = generateSnowflakeId();
        String timePrefix = LocalDateTime.now().format(ORDER_PREFIX_FMT);
        // 订单号格式：时间前缀 + 雪花ID后10位，保证长度与排序可读性
        String idStr = String.valueOf(id);
        String tail = idStr.length() > 10 ? idStr.substring(idStr.length() - 10) : String.format("%010d", id);
        return timePrefix + tail;
    }

    @Override
    public long generateSnowflakeId() {
        return idWorker.nextId();
    }
}