package com.zd.common.core.utils;

import cn.hutool.core.util.StrUtil;
import com.zd.common.core.constant.SecurityConstants;
import com.zd.common.core.exception.PreAuthorizeException;
import com.zd.common.core.text.Convert;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;

import javax.servlet.http.HttpServletRequest;

/**
 * 权限获取工具类
 *
 * @author zd
 */
public class SecurityUtils {
    /**
     * 获取用户
     */
    public static String getUsername() {
        HttpServletRequest httpServletRequest=ServletUtils.getRequest();
        if(null==httpServletRequest){
             return "";
        }
        String username = ServletUtils.getRequest().getHeader(SecurityConstants.DETAILS_USERNAME);
        if(StrUtil.isBlank(username))return "";
        return ServletUtils.urlDecode(username);
    }

    /**
     * 获取用户
     */
    public static String getNickName() {
        HttpServletRequest httpServletRequest=ServletUtils.getRequest();
        if(null==httpServletRequest){
            return "";
        }
        String username = ServletUtils.getRequest().getHeader(SecurityConstants.DETAILS_USERNAME);
        if(StrUtil.isBlank(username))return "";
        return ServletUtils.urlDecode(username);
    }

    /**
     * 获取用户ID
     */
    public static Long getUserId() {
        HttpServletRequest request=ServletUtils.getRequest();
        if(StringUtils.isNull(request)){
            return null;
        }
        String userId= request.getHeader(SecurityConstants.DETAILS_USER_ID);
        if(StringUtils.isNotEmpty(userId)){
            return Convert.toLong(userId);
        }
        return null;
    }

    /**
     * 获取用户ID- 没有则报错
     */
    public static Long getUserIdEx() {
        Long userId = getUserId();
        if (userId == null) {
            throw new PreAuthorizeException();
        }
        return userId;
    }

    /**
     * 获取请求token
     */
    public static String getToken() {
        HttpServletRequest request=ServletUtils.getRequest();
        if(StringUtils.isNull(request)){
            return null;
        }
        return getToken(ServletUtils.getRequest());
    }

    /**
     * 根据request获取请求token
     */
    public static String getToken(HttpServletRequest request) {
        String token = request.getHeader(SecurityConstants.TOKEN_AUTHENTICATION);
        if(StringUtils.isEmpty(token)){
             return null;
        }
        return replaceTokenPrefix(token);
    }

    /**
     * 替换token前缀
     */
    public static String replaceTokenPrefix(String token) {
        if (StringUtils.isNotEmpty(token) && token.startsWith(SecurityConstants.TOKEN_PREFIX)) {
            token = token.replace(SecurityConstants.TOKEN_PREFIX, "");
        }
        return token;
    }


    /**
     * 是否为管理员
     *
     * @param userId 用户ID
     * @return 结果
     */
    public static boolean isAdmin(Long userId) {
        return userId != null && 1L == userId;
    }

    /**
     * 生成BCryptPasswordEncoder密码
     *
     * @param password 密码
     * @return 加密字符串
     */
    public static String encryptPassword(String password) {
        BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
        return passwordEncoder.encode(password);
    }

    /**
     * 判断密码是否相同
     *
     * @param rawPassword     真实密码
     * @param encodedPassword 加密后字符
     * @return 结果
     */
    public static boolean matchesPassword(String rawPassword, String encodedPassword) {
        BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
        return passwordEncoder.matches(rawPassword, encodedPassword);
    }
}
