package com.xzx.gc.interceptor;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.convert.Convert;
import com.xzx.gc.common.dto.log.SqlDto;
import com.xzx.gc.common.utils.SpringUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.ibatis.cache.CacheKey;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.plugin.*;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.type.TypeHandlerRegistry;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Properties;

/**ALL < index < range ~ index_merge < ref < eq_ref < const < system
 * 1.可以用来分析SQL执行效率
 * 2.可以用来获取实际执行的SQL
 *  * @author zhanjixun
 * @time 2018年6月28日 19:20:23
 */
@Slf4j
@Intercepts({
        @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class}),
        @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class, CacheKey.class, BoundSql.class}),
        @Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class})}
)
@Component
public class SqlInterceptor implements Interceptor {

    public static  final String SQL_PARAM="sqlParam";

    @Autowired
    private SpringUtil springUtil;
    
    private int MIN_SIZE = 0;

    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        HttpServletRequest request = springUtil.getCurrentRequest();
        List<SqlDto> sqlList=null;
        if(request!=null) {
            sqlList = (List<SqlDto>) request.getAttribute(SQL_PARAM);
        }

        Object[] args = invocation.getArgs();
        MappedStatement mappedStatement = (MappedStatement) args[0];
        BoundSql boundSql=null;
        if (args.length > 5) {
            boundSql = (BoundSql) args[5];
        }
        if(boundSql==null){
            Object parameter= args[1];
            boundSql = mappedStatement.getBoundSql(parameter);
        }
        String sqlId = mappedStatement.getId();
        Configuration configuration = mappedStatement.getConfiguration();

        long startTime = System.currentTimeMillis();
        Object result = null;
        try {
            result = invocation.proceed();
        } finally {
            try {
                if(request!=null) {
                    SqlCommandType sqlCommandType = mappedStatement.getSqlCommandType();
                    int effectNum = 0;

                    if (sqlCommandType == SqlCommandType.UPDATE || sqlCommandType == SqlCommandType.INSERT || sqlCommandType == SqlCommandType.DELETE) {
                        effectNum = Convert.toInt(result, 0);
                    }else if(sqlId.endsWith("_COUNT")){
                        List<?> objects = Convert.toList(result);
                        if(CollUtil.isNotEmpty(objects)){
                            effectNum=Convert.toInt(objects.get(0),0);
                        }
                    }else if(sqlCommandType==SqlCommandType.SELECT){
                        List<?> objects = Convert.toList(result);
                        if(CollUtil.isNotEmpty(objects)){
                            effectNum=objects.size();
                        }
                    }
                    long sqlCostTime = System.currentTimeMillis() - startTime;
                    String sql = getSql(configuration, boundSql);
                    SqlDto sqlDto = new SqlDto();
                    sqlDto.setSql(sql);
                    sqlDto.setSqlId(sqlId);
                    sqlDto.setCostTime(sqlCostTime + "");
                    sqlDto.setEffectNum(effectNum + "");
                    sqlDto.setSqlType(sqlCommandType.name());
                    if (CollUtil.isNotEmpty(sqlList)) {
                        sqlList.add(sqlDto);
                    } else {
                        sqlList = CollUtil.newArrayList(sqlDto);
                    }
                    request.setAttribute(SQL_PARAM, sqlList);
                }
            } catch (Exception ignored) {
//                ignored.printStackTrace();
            }
        }
        return result;
    }

    @Override
    public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }

    @Override
    public void setProperties(Properties properties) {
        if (properties == null) {
            return;
        }
        if (properties.containsKey("minLogSize")) {
            MIN_SIZE = Integer.valueOf(properties.getProperty("minLogSize"));
        }
    }

    private String getSql(Configuration configuration, BoundSql boundSql) {
        // 输入sql字符串空判断
        if(boundSql==null){
            return "";
        }
        String sql = boundSql.getSql();
        if (StringUtils.isBlank(sql)) {
            return "";
        }

        //美化sql
        sql = beautifySql(sql);

        //填充占位符, 目前基本不用mybatis存储过程调用,故此处不做考虑
        Object parameterObject = boundSql.getParameterObject();
        List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
        if (!parameterMappings.isEmpty() && parameterObject != null) {
            TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
            if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
                sql = this.replacePlaceholder(sql, parameterObject);
            } else {
                MetaObject metaObject = configuration.newMetaObject(parameterObject);
                for (ParameterMapping parameterMapping : parameterMappings) {
                    String propertyName = parameterMapping.getProperty();
                    if (metaObject.hasGetter(propertyName)) {
                        Object obj = metaObject.getValue(propertyName);
                        sql = replacePlaceholder(sql, obj);
                    } else if (boundSql.hasAdditionalParameter(propertyName)) {
                        Object obj = boundSql.getAdditionalParameter(propertyName);
                        sql = replacePlaceholder(sql, obj);
                    }
                }
            }
        }
        return sql;
    }

    private String beautifySql(String sql) {
        return sql.replaceAll("[\\s\n ]+", " ");
    }

    private String replacePlaceholder(String sql, Object parameterObject) {
        String result;
        if(parameterObject!=null) {
            if (parameterObject instanceof String) {
                result = "'" + parameterObject.toString() + "'";
            } else if (parameterObject instanceof Date) {
                result = "'" + getDate2String((Date) parameterObject) + "'";
            } else {
                result = parameterObject.toString();
            }
            return sql.replaceFirst("\\?", result);
        }else {
            return sql;
        }
    }

    private String getDate2String(Date parameterObject) {
        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(parameterObject);
    }

}