package com.zy.influxdb.service;

import com.influxdb.v3.client.InfluxDBClient;
import com.influxdb.v3.client.Point;
import com.influxdb.v3.client.write.WritePrecision;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.Instant;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;


@Service
public class InfluxDBService {

    private static final Logger logger = LoggerFactory.getLogger(InfluxDBService.class);

    @Autowired
    private InfluxDBClient influxDBClient;



    /**
     * 写入数据
     *
     * @param measurement 表名
     * @param tags        标签
     * @param fields      字段
     */
    public void writeData(String measurement, Map<String, String> tags, Map<String, Object> fields) {
        Point point = Point.measurement(measurement)
                .setTags(tags)
                .setFields(fields)
                .setTimestamp(Instant.now().toEpochMilli(), WritePrecision.MS);
        try {
            influxDBClient.writePoint(point);
            System.out.println("Data written to the database.");
        } catch (Exception e) {
            logger.error("Failed to write data to the database.");
            e.printStackTrace();
        }
    }

    /**
     * 查询数据
     *
     * @param sql sql语句
     * @return 查询结果列表
     */
    public List<Map<String, Object>> queryData(String sql) {
        try {
            // 执行查询
            Stream<Object[]> query = influxDBClient.query(sql);
            // 转换为 Map 列表（便于后续处理）
            List<Map<String, Object>> collect = query.map(record -> {
                        Map<String, Object> map = new LinkedHashMap<>();
                        for (int i = 0; i < record.length; i += 2) {
                            map.put((String) record[i], record[i + 1]);
                        }
                        return map;
                    })
                    .collect(Collectors.toList());
            return collect;
        } catch (Exception e) {
            logger.error("Failed to query data from the database.");
            e.printStackTrace();
        }
        return null;
    }


}