package com.zbkj.admin.filter;

import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.StrUtil;
import com.zbkj.common.constants.Constants;
import com.zbkj.common.utils.RedisUtil;
import com.zbkj.common.vo.LoginUserVo;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

/**
 * token验证处理
 */
@Component
public class TokenComponent {

    @Resource
    private RedisUtil redisUtil;

    private static final Long MILLIS_MINUTE_TEN = 20 * 60 * 1000L;

    private static final Long MILLIS_MINUTE = 60 * 1000L;

    // 令牌有效期（默认30分钟） todo 调试期改为5小时
//    private static final int expireTime = 30;
    private static final int expireTime = 5 * 60;

    // Redis 存储的key
    private static final String TOKEN_REDIS = "TOKEN:ADMIN:";

    /**
     * 获取用户身份信息
     *
     * @return 用户信息
     */
    public LoginUserVo getLoginUser(HttpServletRequest request) {
        // 获取请求携带的令牌
        String token = getToken(request);
        if (StrUtil.isNotEmpty(token)) {
            String userKey = getTokenKey(token);
            return redisUtil.get(userKey);
        }
        return null;
    }

    /**
     * 设置用户身份信息
     */
    public void setLoginUser(LoginUserVo loginUser) {
        if (ObjectUtil.isNotNull(loginUser) && StrUtil.isNotEmpty(loginUser.getToken())) {
            refreshToken(loginUser);
        }
    }

    /**
     * 删除用户身份信息
     */
    public void delLoginUser(String token) {
        if (StrUtil.isNotEmpty(token)) {
            String userKey = getTokenKey(token);
            redisUtil.delete(userKey);
        }
    }

    /**
     * 创建令牌
     *
     * @param loginUser 用户信息
     * @return 令牌
     */
    public String createToken(LoginUserVo loginUser) {
        String token = UUID.randomUUID().toString().replace("-", "");
        loginUser.setToken(token);
//        setUserAgent(loginUser);
        refreshToken(loginUser);
        return token;
    }

    /**
     * 验证令牌有效期，相差不足20分钟，自动刷新缓存
     *
     * @param loginUser LoginUserVo
     */
    public void verifyToken(LoginUserVo loginUser) {
        long expireTime = loginUser.getExpireTime();
        long currentTime = System.currentTimeMillis();
        if (expireTime - currentTime <= MILLIS_MINUTE_TEN)
        {
            refreshToken(loginUser);
        }
    }

    /**
     * 刷新令牌有效期
     *
     * @param loginUser 登录信息
     */
    public void refreshToken(LoginUserVo loginUser) {
        loginUser.setLoginTime(System.currentTimeMillis());
        loginUser.setExpireTime(loginUser.getLoginTime() + expireTime * MILLIS_MINUTE);
        // 根据uuid将loginUser缓存
        String userKey = getTokenKey(loginUser.getToken());
        redisUtil.set(userKey, loginUser, (long) expireTime, TimeUnit.MINUTES);
    }

    /**
     * 获取请求token
     *
     * @param request HttpServletRequest
     * @return token
     */
    private String getToken(HttpServletRequest request) {
        String token = request.getHeader(Constants.HEADER_AUTHORIZATION_KEY);
        if (StrUtil.isNotEmpty(token) && token.startsWith(TOKEN_REDIS)) {
            token = token.replace(TOKEN_REDIS, "");
        }
        return token;
    }

    private String getTokenKey(String uuid) {
        return TOKEN_REDIS + uuid;
    }

}
