package com.stylefeng.guns.core.intercept;

import com.stylefeng.guns.modular.system.dao.UserInfoMapper;
import com.stylefeng.guns.modular.system.model.UserInfo;
import com.stylefeng.guns.modular.system.model.vo.BalanceModifyRecordVo;
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.SqlCommandType;
import org.apache.ibatis.plugin.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;
import org.springframework.util.ReflectionUtils;

import java.lang.reflect.Field;
import java.util.*;

/**
 *  用户余额变更拦截器
 * @author sky
 * @version 1.0.0
 * @since 2026/7/3 12:03
 */
@Slf4j
@Component
@Intercepts({@Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class})})
public class BalanceUpdateInterceptor implements Interceptor {

    @Autowired
    private ApplicationContext context;

    private UserInfoMapper getMapper() {
        return context.getBean(UserInfoMapper.class);
    }

    @Override
    public Object intercept(Invocation invocation) throws Throwable {

        MappedStatement ms = (MappedStatement) invocation.getArgs()[0];
        Object param = invocation.getArgs()[1];

        // 获取SQL类型
        SqlCommandType sqlCommandType = ms.getSqlCommandType();

        if (sqlCommandType != SqlCommandType.UPDATE) {
            return invocation.proceed();
        }
        BoundSql boundSql = ms.getBoundSql(param);
        String sql = boundSql.getSql().toLowerCase();

        // 只处理 user 表
        if (!sql.contains("t_user")) {
            return invocation.proceed();
        }

        // 关键：先执行前查旧值（需要拿 userId）
        Map<String, Long> mapValues = extractUserId(param);
        Long userId = mapValues.get("userId");
        if(Objects.isNull(userId)) {
            return invocation.proceed();
        }

        // 查询旧的用户
        UserInfo oldUser = getMapper().selectById(userId);
        // 执行更新
        Object result = invocation.proceed();
        // 查新的用户
        UserInfo newUser = getMapper().selectById(userId);
        Long balanceChangeType = mapValues.get("balanceChangeType");
        if(Objects.nonNull(balanceChangeType)) {
            newUser.setBalanceChangeType(balanceChangeType.intValue());
        }

        // 新增余额的变更记录（所有余额的变更记录都需要存）
        if(Objects.nonNull(oldUser) && Objects.nonNull(newUser)) {
            BalanceModifyRecordVo recordVo = BalanceModifyRecordVo.convert(oldUser, newUser);
            Optional.ofNullable(recordVo).ifPresent(getMapper()::insertBalanceModifyRecord);
        }
        return result;
    }

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

    @Override
    public void setProperties(Properties properties) {

    }

    /**
     * 获取用户id
     */
    private Map<String, Long> extractUserId(Object param) {
        Map<String, Long> mapValues = new HashMap<>();
        if (param == null) {
            return mapValues;
        }

        // MyBatis ParamMap
        if (param instanceof Map) {
            Map<?, ?> map = (Map<?, ?>) param;
            // 第一种：直接传id
            try{

                Object balanceChangeType = map.get("balanceChangeType");
                if (Objects.nonNull(balanceChangeType)) {
                    mapValues.put("balanceChangeType", Long.valueOf(balanceChangeType.toString()));
                }
                Object id = map.get("id");
                if (Objects.nonNull(id)) {
                    mapValues.put("userId", Long.valueOf(id.toString()));
                    return mapValues;
                }
            } catch (Exception e) {
                // log.error("sql中没有id");
            }

            // 第二种：MyBatis-Plus update(entity, wrapper)
            Object entity = map.get("param1");
            if (entity == null) {
                entity = map.get("et");
            }

            if (entity != null) {
                return extractId(entity, mapValues);
            }
        }

        // 直接就是实体
        return extractId(param, mapValues);
    }

    private Map<String, Long> extractId(Object obj, Map<String, Long> mapValues) {
        Field field = ReflectionUtils.findField(obj.getClass(), "id");
        if (field == null) {
            return mapValues;
        }
        ReflectionUtils.makeAccessible(field);
        Object value = ReflectionUtils.getField(field, obj);
        mapValues.put("userId", value == null ? null : Long.valueOf(value.toString()));

        Field fieldType = ReflectionUtils.findField(obj.getClass(), "balanceChangeType");
        if (fieldType == null) {
            return mapValues;
        }
        ReflectionUtils.makeAccessible(fieldType);
        Object valueType = ReflectionUtils.getField(fieldType, obj);
        mapValues.put("balanceChangeType", valueType == null ? null : Long.valueOf(valueType.toString()));
        return mapValues;
    }

}