package com.dy.common.mybatis;


import com.dy.common.po.BaseEntity;
import com.dy.common.util.IDLongGenerator;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.plugin.*;

import java.lang.reflect.Method;
import java.util.List;
import java.util.Map;

@Intercepts(
    {
        @Signature(
            type = Executor.class,
            method = "update",
            args = { MappedStatement.class, Object.class }
        )
    }
)
public class AutoGenerateIdInterceptor implements Interceptor {

    static int MAPPED_STATEMENT_INDEX = 0;
    static int PARAMETER_INDEX = 1;
    static String BASE_FIELD_SET_PRIMARY_KEY_FUNTION_NAME = "setId";

    /**
     * 拦截逻辑实现
     * @param invocation 代理
     * @return Object
     * @throws Throwable 异常
     */
    public Object intercept(Invocation invocation) throws Throwable {
        MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[MAPPED_STATEMENT_INDEX];
        SqlCommandType commandType = mappedStatement.getSqlCommandType();
        if (commandType.equals(SqlCommandType.INSERT)) {
            Object entity = invocation.getArgs()[PARAMETER_INDEX];
            if (entity instanceof BaseEntity) {
                Class<?> entityClass = entity.getClass();
                 Method setIdMt = null ;
                try{
                    setIdMt = entityClass.getMethod(BASE_FIELD_SET_PRIMARY_KEY_FUNTION_NAME, Long.class) ;
                }catch (Exception e){
                    //当entityClass没有setId方法时，会抛出异常
                }
                if(setIdMt != null){
                    setIdMt.invoke(entity, new IDLongGenerator().generate());
                }

                invocation.getArgs()[PARAMETER_INDEX] = entity;
            }else if(entity instanceof Map){
                try {
                    ((List)((Map<?, ?>) entity).get("list")).forEach(e -> {
                        if (e instanceof BaseEntity) {
                            Class<?> entityClass = e.getClass();
                            Method setIdMt = null ;
                            try{
                                setIdMt = entityClass.getMethod(BASE_FIELD_SET_PRIMARY_KEY_FUNTION_NAME, Long.class) ;
                                if(setIdMt != null){
                                    setIdMt.invoke(e, new IDLongGenerator().generate());
                                }
                            }catch (Exception e1){
                                //当entityClass没有setId方法时，会抛出异常
                            }
                        }
                    });
                }catch (Exception e){

                }
            }
        }
        return invocation.proceed();
    }

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

}