package com.dy.common.mybatis;

import lombok.extern.slf4j.Slf4j;
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.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 java.lang.reflect.InvocationTargetException;
import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Properties;

/**
 * 拦截执行SQL发生异常的场景，并将执行错误，执行SQL和参数打印出来
 * 拦截Executor里面的query和update方法
 */
@Intercepts({
        @Signature(
            method = "query",
            type = Executor.class,
            args = {
                MappedStatement.class,
                Object.class,
                RowBounds.class,
                ResultHandler.class
            }
        ),
        @Signature(
            type = Executor.class,
            method = "update",
            args = {
                MappedStatement.class,
                Object.class
            }
        )
})
@Slf4j
public class PrintExceptionSqlInterceptor implements Interceptor {

    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        // 获取执行方法的MappedStatement参数
        MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
        Object parameter = null;
        if (invocation.getArgs().length > 1) {
            parameter = invocation.getArgs()[1];
        }
        String sqlId = mappedStatement.getId();
        BoundSql boundSql = mappedStatement.getBoundSql(parameter);
        Configuration configuration = mappedStatement.getConfiguration();
        Object response;
        try {
            response = invocation.proceed();
        } catch (Exception e) {
            // 输出SQL异常信息
            log.error("SQL ErrorException:", e);
            log.info("SQL Parameters: {}", boundSql.getParameterObject());
            log.info("Execute SqlId: {}", sqlId);
            log.info("Completely Execute SQL: {}", getFullSql(configuration, boundSql));
            // 根据源异常类型进行返回
            if (e instanceof InvocationTargetException) {
                throw new InvocationTargetException(e);
            } else if (e instanceof IllegalAccessException) {
                throw new IllegalAccessException(e.getMessage());
            } else {
                throw new RuntimeException(e);
            }
        }
        return response;
    }

    /**
     * 通过该方法决定要返回的对象是目标对象还是对应的代理
     * 不要想的太复杂，一般就两种情况：
     * <p>
     * 1. return target;  直接返回目标对象，相当于当前Interceptor没起作用，不会调用上面的intercept()方法
     * 2. return Plugin.wrap(target, this);  返回代理对象，会调用上面的intercept()方法
     *
     * @param target 目标对象
     * @return 目标对象或者代理对象
     */
    @Override
    public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }

    /**
     * 用于获取在Configuration初始化当前的Interceptor时时候设置的一些参数
     *
     * @param properties Properties参数
     */
    @Override
    public void setProperties(Properties properties) {
    }


    /**
     * 转义正则特殊字符 （$()*+.[]?\^{}
     * \\需要第一个替换，否则replace方法替换时会有逻辑bug
     */
    private static String makeQueryStringAllRegExp(String str) {
        if (str != null && !"".equals(str)) {
            return str.replace("\\", "\\\\")
                    .replace("*", "\\*")
                    .replace("+", "\\+")
                    .replace("|", "\\|")
                    .replace("{", "\\{")
                    .replace("}", "\\}")
                    .replace("(", "\\(")
                    .replace(")", "\\)")
                    .replace("^", "\\^")
                    .replace("$", "\\$")
                    .replace("[", "\\[")
                    .replace("]", "\\]")
                    .replace("?", "\\?")
                    .replace(",", "\\,")
                    .replace(".", "\\.")
                    .replace("&", "\\&");
        }
        return str;
    }

    /**
     * 获取参数对应的string值
     *
     * @param obj 参数对应的值
     * @return string
     */
    private static String getParameterValue(Object obj) {
        String value;
        if (obj instanceof String) {
            value = "'" + obj + "'";
        } else if (obj instanceof Date) {
            DateFormat formatter =
                    DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.CHINA);
            value = "'" + formatter.format(obj) + "'";
        } else {
            if (obj != null) {
                value = obj.toString();
            } else {
                value = "";
            }
        }
        // 对特殊字符进行转义，方便之后处理替换
        return value != null ? makeQueryStringAllRegExp(value) : "";
    }

    /**
     * 获取完整的执行SQL
     */
    public static String getFullSql(Configuration configuration, BoundSql boundSql) {
        try {
            return parseAndExtractFullSql(configuration, boundSql);
        } catch (Exception e) {
            // 如果解析失败返回原始SQL
            return boundSql.getSql();
        }
    }

    /**
     * 组装完整的sql语句并把对应的参数都代入到sql语句里面
     *
     * @param configuration Configuration
     * @param boundSql      BoundSql
     * @return sql完整语句
     */
    private static String parseAndExtractFullSql(Configuration configuration, BoundSql boundSql) {
        // 获取mapper里面方法上的参数
        Object sqlParameter = boundSql.getParameterObject();
        // sql语句里面需要的参数
        List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
        // sql原始语句(?还没有替换成我们具体的参数)
        String sql = boundSql.getSql().replaceAll("[\\s]+", " ");
        if (!parameterMappings.isEmpty() && sqlParameter != null) {
            // sql语句里面的?替换成真实的参数
            TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
            if (typeHandlerRegistry.hasTypeHandler(sqlParameter.getClass())) {
                sql = sql.replaceFirst("\\?", getParameterValue(sqlParameter));
            } else {
                MetaObject metaObject = configuration.newMetaObject(sqlParameter);
                for (ParameterMapping parameterMapping : parameterMappings) {
                    // 按顺序把?替换成对应的值
                    String propertyName = parameterMapping.getProperty();
                    if (metaObject.hasGetter(propertyName)) {
                        Object obj = metaObject.getValue(propertyName);
                        sql = sql.replaceFirst("\\?", getParameterValue(obj));
                    } else if (boundSql.hasAdditionalParameter(propertyName)) {
                        Object obj = boundSql.getAdditionalParameter(propertyName);
                        sql = sql.replaceFirst("\\?", getParameterValue(obj));
                    }
                }
            }
        }
        return sql;
    }

}