package com.xy.xyaicpzs.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.xy.xyaicpzs.common.ErrorCode;
import com.xy.xyaicpzs.constant.UserConstant;
import com.xy.xyaicpzs.domain.dto.user.UserPhoneLoginRequest;
import com.xy.xyaicpzs.domain.dto.user.UserPhoneRegisterRequest;
import com.xy.xyaicpzs.domain.entity.User;
import com.xy.xyaicpzs.exception.BusinessException;
import com.xy.xyaicpzs.mapper.UserMapper;
import com.xy.xyaicpzs.service.SmsService;
import com.xy.xyaicpzs.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import jakarta.servlet.http.HttpServletRequest;
import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
* @author XY003
* @description 针对表【user(用户表)】的数据库操作Service实现
* @createDate 2025-06-14 09:48:10
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService{

    /**
     * 盐值，混淆密码
     */
    private static final String SALT = "xy";
    
    @Autowired
    private SmsService smsService;

    @Override
    public long userRegister(String userAccount, String userName, String userPassword, String checkPassword) {
        // 1. 校验
        if (StringUtils.isAnyBlank(userAccount, userName, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userName.length() > 40) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户名过长");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        
        // 密码和校验密码相同
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
        }
        
        synchronized (userAccount.intern()) {
            // 账户不能重复
            QueryWrapper<User> queryWrapper = new QueryWrapper<>();
            queryWrapper.eq("userAccount", userAccount);
            long count = this.baseMapper.selectCount(queryWrapper);
            if (count > 0) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
            }
            
            // 2. 加密
            String encryptPassword = DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
            
            // 3. 插入数据
            User user = new User();
            user.setUserAccount(userAccount);
            user.setUserName(userName);
            user.setUserPassword(encryptPassword);
            user.setCreateTime(new Date());
            user.setUpdateTime(new Date());
            // 设置为VIP用户，有效期10天
            user.setIsVip(1);
            Date vipExpireDate = new Date(System.currentTimeMillis() + 10L * 24 * 60 * 60 * 1000);
            user.setVipExpire(vipExpireDate);
            boolean saveResult = this.save(user);
            if (!saveResult) {
                throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库错误");
            }
            return user.getId();
        }
    }

    @Override
    public User userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        // 1. 校验
        if (StringUtils.isAnyBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号错误");
        }
        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码错误");
        }
        
        // 2. 加密
        String encryptPassword = DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
        
        // 查询用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        queryWrapper.eq("userPassword", encryptPassword);
        User user = this.baseMapper.selectOne(queryWrapper);
        
        // 用户不存在
        if (user == null) {
            log.info("user login failed, userAccount cannot match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
        }
        
        // 3. 记录用户的登录态
        request.getSession().setAttribute(UserConstant.USER_LOGIN_STATE, user);
        return getSafetyUser(user);
    }

    /**
     * 获取当前登录用户
     *
     * @param request
     * @return
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
        // 先判断是否已登录
        Object userObj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if (currentUser == null || currentUser.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        // 从数据库查询（追求性能的话可以注释，直接走缓存）
        long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if (currentUser == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }

    /**
     * 用户注销
     *
     * @param request
     */
    @Override
    public boolean userLogout(HttpServletRequest request) {
        if (request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE) == null) {
            throw new BusinessException(ErrorCode.OPERATION_ERROR, "未登录");
        }
        // 移除登录态
        request.getSession().removeAttribute(UserConstant.USER_LOGIN_STATE);
        return true;
    }

    @Override
    public User getSafetyUser(User originUser) {
        if (originUser == null) {
            return null;
        }
        User safetyUser = new User();
        safetyUser.setId(originUser.getId());
        safetyUser.setUserName(originUser.getUserName());
        safetyUser.setUserAccount(originUser.getUserAccount());
        safetyUser.setUserAvatar(originUser.getUserAvatar());
        safetyUser.setUserRole(originUser.getUserRole());
        safetyUser.setCreateTime(originUser.getCreateTime());
        safetyUser.setUpdateTime(originUser.getUpdateTime());
        return safetyUser;
    }

    @Override
    public boolean isAdmin(HttpServletRequest request) {
        // 仅管理员可查询
        Object userObj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        User user = (User) userObj;
        return isAdmin(user);
    }

    @Override
    public boolean isAdmin(User user) {
        return user != null && (UserConstant.ADMIN_ROLE.equals(user.getUserRole()) 
                || UserConstant.SUPER_ADMIN_ROLE.equals(user.getUserRole()));
    }
    
    @Override
    public long userPhoneRegister(UserPhoneRegisterRequest userPhoneRegisterRequest) {
        if (userPhoneRegisterRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        
        String userAccount = userPhoneRegisterRequest.getUserAccount();
        String userPassword = userPhoneRegisterRequest.getUserPassword();
        String checkPassword = userPhoneRegisterRequest.getCheckPassword();
        String phone = userPhoneRegisterRequest.getPhone();
        String code = userPhoneRegisterRequest.getCode();
        String userName = userPhoneRegisterRequest.getUserName();
        
        // 1. 校验
        if (StringUtils.isAnyBlank(userAccount, userPassword, checkPassword, phone, code)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        // 用户名可以为空，如果为空则默认使用账号
        if (StringUtils.isBlank(userName)) {
            userName = userAccount;
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        
        // 密码和校验密码相同
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
        }
        
        // 验证手机号格式
        String phoneRegex = "^1[3-9]\\d{9}$";
        if (!phone.matches(phoneRegex)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "手机号格式错误");
        }
        
        // 验证短信验证码
        boolean isCodeValid = smsService.verifyCode(phone, code);
        if (!isCodeValid) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "验证码错误或已过期");
        }
        
        synchronized (userAccount.intern()) {
            // 账户不能重复
            QueryWrapper<User> accountQueryWrapper = new QueryWrapper<>();
            accountQueryWrapper.eq("userAccount", userAccount);
            long accountCount = this.baseMapper.selectCount(accountQueryWrapper);
            if (accountCount > 0) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号已存在");
            }
            
            // 手机号不能重复
            QueryWrapper<User> phoneQueryWrapper = new QueryWrapper<>();
            phoneQueryWrapper.eq("phone", phone);
            long phoneCount = this.baseMapper.selectCount(phoneQueryWrapper);
            if (phoneCount > 0) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "手机号已注册");
            }
            
            // 2. 加密
            String encryptPassword = DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
            
            // 3. 插入数据
            User user = new User();
            user.setUserAccount(userAccount);
            user.setUserPassword(encryptPassword);
            user.setPhone(phone);
            // 设置用户名
            user.setUserName(userName);
            user.setCreateTime(new Date());
            user.setUpdateTime(new Date());
            // 设置为VIP用户，有效期10天
            user.setIsVip(0);
            Date vipExpireDate = new Date(System.currentTimeMillis() + 10L * 24 * 60 * 60 * 1000);
            user.setVipExpire(vipExpireDate);
            
            boolean saveResult = this.save(user);
            if (!saveResult) {
                throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库错误");
            }
            return user.getId();
        }
    }
    
    @Override
    public User userPhoneLogin(UserPhoneLoginRequest userPhoneLoginRequest, HttpServletRequest request) {
        if (userPhoneLoginRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        
        String phone = userPhoneLoginRequest.getPhone();
        String code = userPhoneLoginRequest.getCode();
        
        // 1. 校验参数
        if (StringUtils.isAnyBlank(phone, code)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        
        // 验证手机号格式
        String phoneRegex = "^1[3-9]\\d{9}$";
        if (!phone.matches(phoneRegex)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "手机号格式错误");
        }
        
        // 验证短信验证码
        boolean isCodeValid = smsService.verifyCode(phone, code);
        if (!isCodeValid) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "验证码错误或已过期");
        }
        
        // 查询用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("phone", phone);
        User user = this.baseMapper.selectOne(queryWrapper);
        
        // 用户不存在
        if (user == null) {
            log.info("user login failed, phone number not registered");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "手机号未注册");
        }
        
        // 3. 记录用户的登录态
        request.getSession().setAttribute(UserConstant.USER_LOGIN_STATE, user);
        return getSafetyUser(user);
    }
    
    @Override
    public String encryptPassword(String password) {
        if (StringUtils.isBlank(password)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码不能为空");
        }
        return DigestUtils.md5DigestAsHex((SALT + password).getBytes());
    }
}