package com.ruoyi.system.service.impl;

import com.ruoyi.common.constant.Constants;
import com.ruoyi.common.core.redis.RedisCache;
import com.ruoyi.common.core.redis.RedisLock;
import com.ruoyi.common.enums.SystemDataNoEnum;
import com.ruoyi.common.exception.ServiceException;
import com.ruoyi.common.utils.DateUtils;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.system.domain.SysSerialNumber;
import com.ruoyi.system.service.ISysSerialNumberService;
import com.ruoyi.system.service.ISystemDataNoService;
import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RLock;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;

@Slf4j
@Service
public class SystemDataNoServiceImpl implements ISystemDataNoService {

    @Autowired
    private RedisLock redisLock;

    @Autowired
    private RedisCache redisCache;

    @Value("${custom.serialNumber.cache.enabled:false}")
    private boolean serialNumberCache;

    @Autowired
    private ISysSerialNumberService serialNumberService;

    private static final long LOCK_WAIT_TIME = 5; // 尝试获取锁最大等待时间（秒）
    private static final long LOCK_LEASE_TIME = 10; // 锁的自动释放时间（秒）



    @Override
    public String getNoByKey(SystemDataNoEnum systemDataNoEnum) {
        String baseNo = systemDataNoEnum.getNo();
        if (StringUtils.isEmpty(baseNo)) {
            return "";
        }

        String dayKey = DateUtils.dateTime();
        String fullKey = baseNo + dayKey;
        RLock lock = redisLock.getRLock(Constants.SYS_DATASERIALNUMBER_KEYPREFIX + fullKey);

        boolean locked = false;
        try {
            locked = lock.tryLock(LOCK_WAIT_TIME, LOCK_LEASE_TIME, TimeUnit.SECONDS);
            if (!locked) {
                throw new RuntimeException("获取锁失败，请稍后重试");
            }

            log.info("{}进入", Thread.currentThread().getName());
            Integer serial = getOrInitSerialNumber(fullKey, baseNo, dayKey);
            redisCache.setCacheObject(fullKey, serial, 1, TimeUnit.DAYS);

            return formatSerialNumber(fullKey, serial);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
            throw new RuntimeException("获取锁异常", e);
        } finally {
            if (locked) {
                unlockIfHeld(lock);
            }
        }
    }

    private void unlockIfHeld(RLock lock) {
        try {
            if (lock != null && lock.isLocked() && lock.isHeldByCurrentThread()) {
                lock.unlock();
            }
        } catch (Exception e) {
            log.warn("释放锁异常: {}", e.getMessage(), e);
        }
    }

    // 以下方法保持原样
    private Integer getOrInitSerialNumber(String fullKey, String baseNo, String dayKey) {
        Integer serial = serialNumberCache ? redisCache.getCacheObject(fullKey) : null;

        if (serial != null) {
            return serial + 1;
        }

        SysSerialNumber serialNumber = new SysSerialNumber();
        serialNumber.setKeyStr(baseNo);
        serialNumber.setKeyAuxStr(dayKey);
        serialNumber.setNo(fullKey);

        List<SysSerialNumber> existingNumbers = serialNumberService.selectSysSerialNumberList(serialNumber);
        serial = existingNumbers != null && !existingNumbers.isEmpty()
                ? existingNumbers.get(0).getSerialNumber()
                : 0;

        if (serial == 0) {
            serialNumber.setSerialNumber(1);
            serialNumberService.insertSysSerialNumber(serialNumber);
            return 1;
        }
        return serial + 1;
    }

    private String formatSerialNumber(String prefix, Integer serial) {
        return prefix + String.format("%04d", serial);
    }


}