package com.zhongzheng.framework.web.service;

import cn.hutool.core.lang.Validator;
import cn.hutool.core.util.IdUtil;
import cn.hutool.http.useragent.UserAgent;
import cn.hutool.http.useragent.UserAgentUtil;
import com.zhongzheng.common.constant.Constants;
import com.zhongzheng.common.core.domain.model.TopLoginUser;
import com.zhongzheng.common.core.redis.RedisCache;
import com.zhongzheng.common.exception.CustomException;
import com.zhongzheng.common.exception.user.UserPasswordNotMatchException;
import com.zhongzheng.common.utils.MessageUtils;
import com.zhongzheng.common.utils.ServletUtils;
import com.zhongzheng.common.utils.ip.AddressUtils;
import com.zhongzheng.common.utils.ip.IpUtils;
import com.zhongzheng.framework.manager.AsyncManager;
import com.zhongzheng.framework.manager.factory.AsyncFactory;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.stereotype.Component;

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

/**
 * token验证处理
 *
 * @author zhongzheng
 */
@Component
public class TopTokenService
{
    // 令牌自定义标识
    @Value("${token.header}")
    private String header;

    // 令牌秘钥
    @Value("${token.secret}")
    private String secret;

    // 令牌有效期（默认30分钟）
    @Value("${token.expireTime}")
    private int expireTime;

    protected static final long MILLIS_SECOND = 1000;

    protected static final long MILLIS_MINUTE = 60 * MILLIS_SECOND;

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

    @Autowired
    private RedisCache redisCache;

    @Resource
    private AuthenticationManager authenticationManager;

    /**
     * 获取用户身份信息
     *
     * @return 用户信息
     */
    public TopLoginUser getLoginUser(HttpServletRequest request)
    {

        //测试用户
        String test_token = request.getHeader("X-Auth-Token");
        if("test".equals(test_token)){
            return getTestUser();
        }
        // 获取请求携带的令牌
        String token = getToken(request);
        if (Validator.isNotEmpty(token))
        {
            Claims claims = parseToken(token);
            // 解析对应的权限以及用户信息
            String uuid = (String) claims.get(Constants.LOGIN_USER_KEY);
            String userKey = getTokenKey(uuid);
            TopLoginUser user = redisCache.getCacheObject(userKey);
            return user;
        }

        return null;
    }

    private TopLoginUser getTestUser(){
        Authentication authentication = null;
        try
        {
            // 该方法会去调用UserDetailsServiceImpl.loadUserByUsername
            authentication = authenticationManager
                    .authenticate(new UsernamePasswordAuthenticationToken("admin", "admin123"));
        }
        catch (Exception e)
        {
            if (e instanceof BadCredentialsException)
            {
                AsyncManager.me().execute(AsyncFactory.recordLogininfor("admin", Constants.LOGIN_FAIL, MessageUtils.message("user.password.not.match")));
                throw new UserPasswordNotMatchException();
            }
            else
            {
                AsyncManager.me().execute(AsyncFactory.recordLogininfor("admin", Constants.LOGIN_FAIL, e.getMessage()));
                throw new CustomException(e.getMessage());
            }
        }
        TopLoginUser loginUser = (TopLoginUser) authentication.getPrincipal();
        loginUser.setExpireTime(System.currentTimeMillis()+200);
        return loginUser;
    }

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

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

    /**
     * 创建令牌
     *
     * @param loginUser 用户信息
     * @return 令牌
     */
    public String createToken(TopLoginUser loginUser)
    {
        String token = IdUtil.fastUUID();
        loginUser.setToken(token);
        setUserAgent(loginUser);
        refreshToken(loginUser);

        Map<String, Object> claims = new HashMap<>();
        claims.put(Constants.LOGIN_USER_KEY, token);
        return createToken(claims);
    }

    /**
     * 验证令牌有效期，相差不足20分钟，自动刷新缓存
     *
     * @param loginUser
     * @return 令牌
     */
    public void verifyToken(TopLoginUser 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(TopLoginUser loginUser)
    {
        loginUser.setLoginTime(System.currentTimeMillis());
        loginUser.setExpireTime(loginUser.getLoginTime() + expireTime * MILLIS_MINUTE);
        // 根据uuid将loginUser缓存
        String userKey = getTokenKey(loginUser.getToken());
        redisCache.setCacheObject(userKey, loginUser, expireTime, TimeUnit.MINUTES);
    }

    /**
     * 设置用户代理信息
     *
     * @param loginUser 登录信息
     */
    public void setUserAgent(TopLoginUser loginUser)
    {
        UserAgent userAgent = UserAgentUtil.parse(ServletUtils.getRequest().getHeader("User-Agent"));
        String ip = IpUtils.getIpAddr(ServletUtils.getRequest());
        loginUser.setIpaddr(ip);
        loginUser.setLoginLocation(AddressUtils.getRealAddressByIP(ip));
        loginUser.setBrowser(userAgent.getBrowser().getName());
        loginUser.setOs(userAgent.getOs().getName());
    }

    /**
     * 从数据声明生成令牌
     *
     * @param claims 数据声明
     * @return 令牌
     */
    private String createToken(Map<String, Object> claims)
    {
        String token = Jwts.builder()
                .setClaims(claims)
                .signWith(SignatureAlgorithm.HS512, secret).compact();
        return token;
    }

    /**
     * 从令牌中获取数据声明
     *
     * @param token 令牌
     * @return 数据声明
     */
    private Claims parseToken(String token)
    {
        return Jwts.parser()
                .setSigningKey(secret)
                .parseClaimsJws(token)
                .getBody();
    }

    /**
     * 从令牌中获取用户名
     *
     * @param token 令牌
     * @return 用户名
     */
    public String getUsernameFromToken(String token)
    {
        Claims claims = parseToken(token);
        return claims.getSubject();
    }

    /**
     * 获取请求token
     *
     * @param request
     * @return token
     */
    public String getToken(HttpServletRequest request)
    {
        String token = request.getHeader(header);
        if (Validator.isNotEmpty(token) && token.startsWith(Constants.SUPER_TOKEN_PREFIX))
        {
            token = token.replace(Constants.SUPER_TOKEN_PREFIX, "");
            return token;
        }else{
            return null;
        }

    }

    private String getTokenKey(String uuid)
    {
        return Constants.LOGIN_TOKEN_KEY + uuid;
    }
}
