package com.lxzn.base.service.impl;

import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.DefaultTransactionDefinition;

import java.util.List;

@Service
public class DataImportService {

    @Autowired
    private PlatformTransactionManager transactionManager;

    @Autowired
    private SqlSessionTemplate sqlSessionTemplate;

    public <T> int batchInsert(List<T> data, Class<T> entityClass) {
        if (CollectionUtils.isEmpty(data)) return 0;

        TransactionDefinition txDef = new DefaultTransactionDefinition();
        TransactionStatus txStatus = transactionManager.getTransaction(txDef);

        try {
            String statement = entityClass.getName() + ".batchInsert";
            int batchSize = 1000;
            int total = 0;

            for (int i = 0; i < data.size(); i += batchSize) {
                List<T> subList = data.subList(i, Math.min(i + batchSize, data.size()));
                total += sqlSessionTemplate.insert(statement, subList);
            }

            transactionManager.commit(txStatus);
            return total;
        } catch (Exception e) {
            transactionManager.rollback(txStatus);
            throw new RuntimeException(e);
        }
    }
}