/*
 *  Copyright 2019-2020 Zheng Jie
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package me.zhengjie.service.impl;

import cn.hutool.core.lang.Dict;
import cn.hutool.core.util.ObjectUtil;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import lombok.RequiredArgsConstructor;
import me.zhengjie.domain.SysLog;
import me.zhengjie.repository.LogRepository;
import me.zhengjie.service.SysLogService;
import me.zhengjie.service.dto.SysLogQueryCriteria;
import me.zhengjie.service.dto.SysLogSmallDto;
import me.zhengjie.service.mapstruct.LogErrorMapper;
import me.zhengjie.service.mapstruct.LogSmallMapper;
import me.zhengjie.utils.*;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
import java.util.*;

/**
 * @author Zheng Jie
 * @date 2018-11-24
 */
@Service
@RequiredArgsConstructor
public class SysLogServiceImpl implements SysLogService {
    private final LogRepository logRepository;
    private final LogErrorMapper logErrorMapper;
    private final LogSmallMapper logSmallMapper;

    @Override
    public Object queryAll(SysLogQueryCriteria criteria, Pageable pageable) {
        Page<SysLog> page = logRepository.findAll(((root, criteriaQuery, cb) -> QueryHelp.getPredicate(root, criteria, cb)), pageable);
        String status = "ERROR";
        if (status.equals(criteria.getLogType())) {
            return PageUtil.toPage(page.map(logErrorMapper::toDto));
        }
        return PageUtil.toPage(page);
    }

    @Override
    public List<SysLog> queryAll(SysLogQueryCriteria criteria) {
        return logRepository.findAll(((root, criteriaQuery, cb) -> QueryHelp.getPredicate(root, criteria, cb)));
    }

    @Override
    public PageResult<SysLogSmallDto> queryAllByUser(SysLogQueryCriteria criteria, Pageable pageable) {
        Page<SysLog> page = logRepository.findAll(((root, criteriaQuery, cb) -> QueryHelp.getPredicate(root, criteria, cb)), pageable);
        return PageUtil.toPage(page.map(logSmallMapper::toDto));
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void save(String username, String browser, String ip, ProceedingJoinPoint joinPoint, SysLog sysLog) {
        if (sysLog == null) {
            throw new IllegalArgumentException("Log 不能为 null!");
        }
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        Method method = signature.getMethod();
        me.zhengjie.annotation.Log aopLog = method.getAnnotation(me.zhengjie.annotation.Log.class);

        // 方法路径
        String methodName = joinPoint.getTarget().getClass().getName() + "." + signature.getName() + "()";

        // 描述
        sysLog.setDescription(aopLog.value());
        
        sysLog.setRequestIp(ip);
        sysLog.setAddress(StringUtils.getCityInfo(sysLog.getRequestIp()));
        sysLog.setMethod(methodName);
        sysLog.setUsername(username);
        sysLog.setParams(getParameter(method, joinPoint.getArgs()));
        // 记录登录用户，隐藏密码信息
        if(signature.getName().equals("login") && StringUtils.isNotEmpty(sysLog.getParams())){
            JSONObject obj = JSON.parseObject(sysLog.getParams());
            sysLog.setUsername(obj.getString("username"));
            sysLog.setParams(JSON.toJSONString(Dict.create().set("username", sysLog.getUsername())));
        }
        sysLog.setBrowser(browser);
        logRepository.save(sysLog);
    }

    /**
     * 根据方法和传入的参数获取请求参数
     */
    private String getParameter(Method method, Object[] args) {
        List<Object> argList = new ArrayList<>();
        Parameter[] parameters = method.getParameters();
        for (int i = 0; i < parameters.length; i++) {
            // 过滤掉不能序列化的类型: MultiPartFile
            if (args[i] instanceof MultipartFile) {
                continue;
            }
            //将RequestBody注解修饰的参数作为请求参数
            RequestBody requestBody = parameters[i].getAnnotation(RequestBody.class);
            if (requestBody != null) {
                argList.add(args[i]);
            }
            //将RequestParam注解修饰的参数作为请求参数
            RequestParam requestParam = parameters[i].getAnnotation(RequestParam.class);
            if (requestParam != null) {
                Map<String, Object> map = new HashMap<>(2);
                String key = parameters[i].getName();
                if (!StringUtils.isEmpty(requestParam.value())) {
                    key = requestParam.value();
                }
                map.put(key, args[i]);
                argList.add(map);
            }
        }
        if (argList.isEmpty()) {
            return "";
        }
        return argList.size() == 1 ? JSON.toJSONString(argList.get(0)) : JSON.toJSONString(argList);
    }

    @Override
    public Object findByErrDetail(Long id) {
        SysLog sysLog = logRepository.findById(id).orElseGet(SysLog::new);
        ValidationUtil.isNull(sysLog.getId(), "Log", "id", id);
        byte[] details = sysLog.getExceptionDetail();
        return Dict.create().set("exception", new String(ObjectUtil.isNotNull(details) ? details : "".getBytes()));
    }

    @Override
    public void download(List<SysLog> sysLogs, HttpServletResponse response) throws IOException {
        List<Map<String, Object>> list = new ArrayList<>();
        for (SysLog sysLog : sysLogs) {
            Map<String, Object> map = new LinkedHashMap<>();
            map.put("用户名", sysLog.getUsername());
            map.put("IP", sysLog.getRequestIp());
            map.put("IP来源", sysLog.getAddress());
            map.put("描述", sysLog.getDescription());
            map.put("浏览器", sysLog.getBrowser());
            map.put("请求耗时/毫秒", sysLog.getTime());
            map.put("异常详情", new String(ObjectUtil.isNotNull(sysLog.getExceptionDetail()) ? sysLog.getExceptionDetail() : "".getBytes()));
            map.put("创建日期", sysLog.getCreateTime());
            list.add(map);
        }
        FileUtil.downloadExcel(list, response);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void delAllByError() {
        logRepository.deleteByLogType("ERROR");
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void delAllByInfo() {
        logRepository.deleteByLogType("INFO");
    }
}