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package com.huaweicloud.dws.client.executor;

import com.huaweicloud.dws.client.DwsConfig;
import com.huaweicloud.dws.client.exception.DwsClientException;
import com.huaweicloud.dws.client.model.Record;
import com.huaweicloud.dws.client.model.TableSchema;
import com.huaweicloud.dws.client.util.JdbcUtil;
import com.huaweicloud.dws.client.util.LogUtil;
import lombok.extern.slf4j.Slf4j;
import com.huawei.gauss200.jdbc.core.BaseConnection;

import java.sql.Connection;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @ProjectName: dws-connector
 * @ClassName: CopyExecutor
 * @Description: copy执行器
 * @Date: 2023/1/17 17:45
 * @Version: 1.0
 */
@Slf4j
public class CopyExecutor {
    public void execute(List records, Connection connection, String table, DwsConfig config) throws DwsClientException {
        if (records == null || records.isEmpty()) {
            LogUtil.withLogSwitch(config, () -> log.info("It is intended to execute copy, but the data is null and returned directly"));
            return;
        }
        long startTime = System.currentTimeMillis();
        Record first = records.get(0);
        TableSchema schema = first.getTableSchema();
        List insertColumns = schema.getColumnNames().stream().filter(first::isSet).collect(Collectors.toList());
        String copySql = JdbcUtil.getCopyFromStdinStatement(table, insertColumns);
        String buffer = JdbcUtil.buildCopyBuffer(records, config);
        LogUtil.withLogSwitch(config, () -> log.info("Copy data to dws, and sql is {}, data size  {} and byte size  {}", copySql, records.size(), buffer.length()));
        // copy到临时表 或者直接到目标表
        try {
            JdbcUtil.executeCopy((BaseConnection) connection, copySql, buffer);
        } catch (Exception e) {
            log.error("execute copy fail. sql = {}", copySql, e);
            throw DwsClientException.fromException(e);
        }
        LogUtil.withLogSwitch(config, () -> log.info("Copy data to dws successful,use time {}", System.currentTimeMillis() - startTime));
    }
}