package org.dromara.eims.service.impl;

import lombok.RequiredArgsConstructor;
import org.dromara.common.core.constant.CacheConstants;
import org.dromara.common.core.domain.R;
import org.dromara.common.redis.utils.RedisUtils;
import org.dromara.eims.service.IGenerateCodeService;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
@RequiredArgsConstructor
@Service
public class GenerateCodeServiceImpl implements IGenerateCodeService {
    @Override
    public String generateCode(String prefix) {
        String key = CacheConstants.EIMS_GENERATE_CODE + ":" + prefix;
        String todayStr = DateTimeFormatter.ofPattern("yyyyMMdd").format(LocalDate.now());
        String code;
        // 使用Redis的原子性操作避免并发问题
        String oldCode = RedisUtils.getCacheObject(key);
        if (oldCode != null && oldCode.contains(todayStr)) {
            int no = Integer.parseInt(oldCode.substring(oldCode.length() - 4));
            code = String.format("%s%s%04d", prefix, todayStr, no + 1);
        } else {
            code = String.format("%s%s%04d", prefix, todayStr, 1);
        }

        // 更新缓存
        try {
            RedisUtils.setCacheObject(key, code);
            return code;
        } catch (Exception e) {
            return null;
        }


    }
}