package se.cloud.analysis.service;

import jdk.nashorn.internal.objects.Global;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import se.cloud.analysis.dao.UserDao;
import se.cloud.analysis.domain.User;
import se.cloud.analysis.exception.GlobalException;
import se.cloud.analysis.redis.RedisService;
import se.cloud.analysis.redis.UserKey;
import se.cloud.analysis.result.CodeMsg;
import se.cloud.analysis.utils.MD5Util;
import se.cloud.analysis.utils.SaltUtil;
import se.cloud.analysis.utils.UUIDUtil;
import se.cloud.analysis.vo.InformationVO;
import se.cloud.analysis.vo.LoginVO;
import se.cloud.analysis.vo.RegisterVO;
import sun.security.provider.MD5;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;

@Service
public class UserService {

    @Autowired
    private UserDao userDao;

    @Autowired
    private RedisService redisService;

    public static final String COOKIE_NAME_TOKEN = "se_education_cloud_data_analysis_token";

    public User getUserByEmail(String email) {
        return userDao.getUserByEmail(email);
    }

    public User getUserByToken(String token) {
        return redisService.get(UserKey.getKeyByTokenAndDefaultExpireTime(token).getKey(), User.class);
    }

    public int updateUser(User user) {
        return userDao.updateUser(user);
    }

    public int delete(String email) {
        return userDao.deleteUser(email);
    }

    public InformationVO getInformationByEmail(String email) {
        User user = getUserByEmail(email);
        if (user == null) {
            throw new GlobalException(CodeMsg.EMAIL_NOT_EXIST);
        } else {
            return InformationVO.userToInformationVO(user);
        }
    }

    public InformationVO getInformationByToken(String token) {
        if (StringUtils.isEmpty(token)) {
            throw new GlobalException(CodeMsg.TOKEN_EMPTY);
        }
        User user = getUserByToken(token);
        if (user == null) {
            throw new GlobalException(CodeMsg.TOKEN_HAS_EXPIRED);
        }
        return InformationVO.userToInformationVO(user);
    }

    public boolean register(RegisterVO registerVO) {
        if (registerVO == null) {
            throw new GlobalException(CodeMsg.SERVER_ERROR);
        }
        String email = registerVO.getEmail();
        String formPassword = registerVO.getPassword();
        String name = registerVO.getName();
        if (getUserByEmail(email) != null) {
            throw new GlobalException(CodeMsg.USER_ALREADY_EXISTS);
        }
        User user = new User();
        String randomSalt = SaltUtil.generateRandomSalt();
        user.setEmail(email);
        user.setPassword(MD5Util.formPassToDbPass(formPassword, randomSalt));
        user.setName(name);
        user.setSalt(randomSalt);
        if (userDao.insertUser(user) == 1) {
            return true;
        } else {
            throw new GlobalException(CodeMsg.SERVER_ERROR);
        }
    }

    public boolean login(HttpServletResponse response, LoginVO loginVO) {
        if (loginVO == null) {
            throw new GlobalException(CodeMsg.SERVER_ERROR);
        }
        String email = loginVO.getEmail();
        String formPass = loginVO.getPassword();
        //判断邮箱是否存在
        User user = getUserByEmail(email);
        if (user == null) {
            throw new GlobalException(CodeMsg.EMAIL_NOT_EXIST);
        }
        //验证密码
        String dbPass = user.getPassword();
        String dbSalt = user.getSalt();
        String calculatePass = MD5Util.formPassToDbPass(formPass, dbSalt);
        if (!calculatePass.equals(dbPass)) {
            throw  new GlobalException(CodeMsg.PASSWORD_ERROR);
        }
        //生成Cookie
        String token = UUIDUtil.uuid();
        UserKey redisKey = UserKey.getKeyByTokenAndDefaultExpireTime(token);
        redisService.set(redisKey, user);
        Cookie cookie = new Cookie(COOKIE_NAME_TOKEN, token);
        cookie.setMaxAge(redisKey.getExpireSeconds());
        cookie.setPath("/");
        response.addCookie(cookie);
        return true;
    }
}