package com.common.core.utils;

import com.common.core.constant.GlobalConst;
import com.common.redis.util.RedisUtil;
import com.common.security.configure.AppDetails;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Component;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;


/**
 * @author 廖振钦
 * @date 2022-01-17
 */
@Slf4j
@Component
public class JwtTokenUtil {
    @Autowired
    private RedisUtil redisUtil;
    public static final String CLAIM_KEY_APPID = "appid";
    public static final String CLAIM_KEY_USERID = "userid";
    private static final String CLAIM_KEY_CREATED = "created";
    private Long expiration = GlobalConst.TOKEN_EXPIRE+GlobalConst.TOKEN_EXPIRE_BUFF;

    /**
     * 根据负责生成JWT的token
     */
    private String generateToken(Map<String, Object> claims) {
        return Jwts.builder()
                .setClaims(claims)
                .setExpiration(generateExpirationDate())
                .signWith(SignatureAlgorithm.HS512, SM4Utils.getPassword())
                .compact();
    }

    /**
     * 从token中获取JWT中的负载
     */
    private Claims getClaimsFromToken(String token) {
        Claims claims = Jwts.parser()
                    .setSigningKey(SM4Utils.getPassword())
                    .parseClaimsJws(token)
                    .getBody();
        return claims;
    }

    /**
     * 生成token的过期时间
     */
    private Date generateExpirationDate() {
        return new Date(System.currentTimeMillis() + expiration * 1000);
    }

    /**
     * 从token中获取登录用户名
     */
    public String getAppidFromToken(String token) {
        String appid;
        try {
            Claims claims = getClaimsFromToken(token);
            appid = claims.get(CLAIM_KEY_APPID).toString();
        } catch (Exception e) {
            log.error("getAppidFromToken error:",e);
            appid = null;
        }
        return appid;
    }
    /**
     * 从token中获取登录用户名
     */
    public String getUseridFromToken(String token) {
        String userid;
        try {
            Claims claims = getClaimsFromToken(token);
            userid = claims.get(CLAIM_KEY_USERID)==null? "" : claims.get(CLAIM_KEY_USERID).toString();
        } catch (Exception e) {
            log.error("getUseridFromToken error:",e);
            userid = null;
        }
        return userid;
    }

    public Claims getClaim(String token) {
        try {
            Claims claims = getClaimsFromToken(token);
            return claims;
        } catch (Exception e) {
            log.error("getClaim error:",e);
            return null;
        }
    }

    /**
     * 验证token是否还有效
     *
     * @param token       客户端传入的token
     * @param userDetails 从数据库中查询出来的用户信息
     */
    public boolean validateToken(String token, UserDetails userDetails) {
        String key= GlobalConst.TOKEN_KEY+userDetails.getUsername();
        String tmpKey= GlobalConst.TOKEN_KEY_TMP+userDetails.getUsername();
        Object useridobject = getClaim(token).get(JwtTokenUtil.CLAIM_KEY_USERID);
        if(!Objects.isNull(useridobject)){
            key +=":"+useridobject.toString();
            tmpKey +=":"+useridobject.toString();
        }
        return (redisUtil.get(key) !=null && token.equals(redisUtil.get(key).toString()) && !isTokenExpired(token))
                ||(redisUtil.get(tmpKey) !=null && token.equals(redisUtil.get(tmpKey).toString()) && !isTokenExpired(token));
    }

    /**
     * 判断token是否已经失效
     */
    private boolean isTokenExpired(String token) {
        Date expiredDate = getExpiredDateFromToken(token);
        return expiredDate.before(new Date());
    }

    /**
     * 从token中获取过期时间
     */
    private Date getExpiredDateFromToken(String token) {
        Claims claims = getClaimsFromToken(token);
        return claims.getExpiration();
    }

    /**
     * 根据用户信息生成token
     */
    public String generateToken(AppDetails userDetails) {
        Map<String, Object> claims = new HashMap<>();
        claims.put(CLAIM_KEY_APPID, userDetails.getUsername());
        if(StringUtils.isNotEmpty(userDetails.getUserid())){
            claims.put(CLAIM_KEY_USERID, userDetails.getUserid());

        }
        claims.put(CLAIM_KEY_CREATED, new Date());
        return generateToken(claims);
    }

    /**
     * 判断token是否可以被刷新
     */
    public boolean canRefresh(String token) {
        return !isTokenExpired(token);
    }

    /**
     * 刷新token
     */
    public String refreshToken(String token) {
        Claims claims = getClaimsFromToken(token);
        claims.put(CLAIM_KEY_CREATED, new Date());
        return generateToken(claims);
    }
}