package com.iailab.module.model.mdk.sample;

import com.iailab.module.model.mdk.sample.dto.SampleData;
import com.iailab.module.model.mdk.sample.dto.SampleInfo;
import com.iailab.module.model.mdk.vo.DataValueVO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.CollectionUtils;

import java.util.*;

abstract class SampleDataConstructor {

    private Logger logger = LoggerFactory.getLogger(getClass());

    /**
     * prepareSampleData
     *
     * @param sampleInfo
     * @return
     */
    public abstract List<SampleData> prepareSampleData(SampleInfo sampleInfo);

    /**
     * 补全数据
     *
     * @param length
     * @param dataEntityList
     * @param startTime
     * @param endTime
     * @return
     */
    public List<DataValueVO> completionData(int length, List<DataValueVO> dataEntityList, Date startTime, Date endTime, int granularity) {
        if (CollectionUtils.isEmpty(dataEntityList) || length <= dataEntityList.size()) {
            return dataEntityList;
        }
        logger.info("补全数据, length =" + length + "; size = " + dataEntityList.size() + "; startTime = " + startTime.getTime() + "; endTime = " + endTime.getTime());
        logger.info("补全前：" + dataEntityList);

        Map<Long, Double> sourceDataMap = new HashMap<>(dataEntityList.size());
        for (DataValueVO dataEntity : dataEntityList) {
            sourceDataMap.put(dataEntity.getDataTime().getTime(), dataEntity.getDataValue());
        }

        //找出缺少项
        long oneMin = 1000 * granularity;
        long start = startTime.getTime();
        long end = endTime.getTime();
        long mins = ((end - start) / oneMin) + 1;
        Map<Long, Double> dataMap = new LinkedHashMap<>();
        for (int i = 0; i < mins; i++) {
            Long key = start + oneMin * i;
            Double value = sourceDataMap.get(key);
            dataMap.put(key, value);
        }

        //补充缺少项
        int k = 0;
        Map.Entry<Long, Double> lastItem = null;
        List<DataValueVO> completionDataEntityList = new ArrayList<>();
        for (Map.Entry<Long, Double> item : dataMap.entrySet()) {
            if (k == 0 && item.getValue() == null) {
                item.setValue(getFirstValue(dataMap));
            } else if (item.getValue() == null) {
                item.setValue(lastItem.getValue());
            }
            k++;
            lastItem = item;

            DataValueVO dataEntity = new DataValueVO();
            dataEntity.setDataTime(new Date(item.getKey()));
            dataEntity.setDataValue(item.getValue());
            completionDataEntityList.add(dataEntity);
        }

        logger.info("补全后：" + completionDataEntityList);
        return completionDataEntityList;
    }

    /**
     * getFirstValue
     *
     * @param dataMap
     * @return
     */
    private Double getFirstValue(Map<Long, Double> dataMap) {
        for (Map.Entry<Long, Double> item : dataMap.entrySet()) {
            if (item.getValue() != null) {
                return item.getValue();
            }
        }
        return null;
    }

}