package com.nanometer.smartlab.service;

import com.nanometer.smartlab.dao.SysSequenceDao;
import com.nanometer.smartlab.entity.SysSequence;
import com.nanometer.smartlab.util.Constants;
import com.nanometer.smartlab.util.Utils;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.math.RandomUtils;
import org.apache.log4j.Logger;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.util.Date;

/**
 * Created by johnny on 17/12/13.
 */
@Service("sysSequenceService")
@Scope("singleton")
public class SysSequenceServiceImpl implements SysSequenceService {

    private static Logger logger = Logger.getLogger(SysSequenceService.class);

    @Resource(name = "sysSequenceDao")
    SysSequenceDao sysSequenceDao;

    @Transactional(propagation = Propagation.REQUIRED)
    private synchronized int getNextVal(String seqId) {
        int result = -1;
        try {
            if (StringUtils.isNotBlank(seqId)) {
                SysSequence sequence = this.sysSequenceDao.getSysSequence(seqId);
                if (sequence == null) {
                    sequence = new SysSequence();
                    sequence.setId(seqId);
                    sequence.setName(seqId);
                    sequence.setMinVal(0);
                    sequence.setMaxVal(99999);
                    sequence.setStep(1);
                    sequence.setCurrentVal(0);
                    this.sysSequenceDao.insertSysSequence(sequence);
                }

                int currentVal = sequence.getCurrentVal() + sequence.getStep();
                if (currentVal > sequence.getMaxVal()) {
                    currentVal = sequence.getMinVal();
                }

                sequence.setCurrentVal(currentVal);
                result = currentVal;

                this.sysSequenceDao.updateSysSequence(sequence);
            }
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
            result = -1;
        }

        return result;
    }

    @Transactional(propagation = Propagation.REQUIRED)
    public String getApplyCode() {
        StringBuffer result = new StringBuffer("");
        result.append("SG");
        result.append(Utils.formatDateToString(new Date(), "yyyyMMdd"));

        int seq = this.getNextVal(Constants.SEQ_APPLY_CODE);
        String seqStr = "";
        if (seq == -1) {
            seqStr = String.valueOf(RandomUtils.nextInt(5));
        } else {
            seqStr = String.valueOf(seq);
            if (seqStr.length() < 5) {
                seqStr = String.format("%05d", seq);
            }
        }

        result.append(seqStr);

        return result.toString();
    }

    @Transactional(propagation = Propagation.REQUIRED)
    public String getOrderCode() {
        StringBuffer result = new StringBuffer("");
        result.append("OD");
        result.append(Utils.formatDateToString(new Date(), "yyyyMMdd"));

        int seq = this.getNextVal(Constants.SEQ_ORDER_CODE);
        String seqStr = "";
        if (seq == -1) {
            seqStr = String.valueOf(RandomUtils.nextInt(5));
        } else {
            seqStr = String.valueOf(seq);
            if (seqStr.length() < 5) {
                seqStr = String.format("%05d", seq);
            }
        }

        result.append(seqStr);

        return result.toString();
    }
}