package com.dg.core.manager;

import com.dg.core.db.gen.entity.HuaChengSysUser;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.stereotype.Component;

import java.io.Serializable;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * token验证处理
 *
 * @author ruoyi
 */
@Component
public class JWTTokenUtil implements Serializable {
    /**
     * 从数据声明生成令牌
     *
     * @param claims
     *            数据声明
     * @return 令牌
     */
    private static String generateToken(Map<String, Object> claims) {
        Date expirationDate = new Date(System.currentTimeMillis() + TokenConstant.EXPIRETIME_LONG * 60 * 1000 * 72);
        return Jwts.builder().setClaims(claims).setExpiration(expirationDate)
            .signWith(SignatureAlgorithm.HS512, TokenConstant.SECRET).compact();
    }

    /**
     * 生成刷新token
     * 
     * @param claims
     *            tokenbody
     * @return refreshtoken
     */
    private static String generateTokenRefreshToken(Map<String, Object> claims) {
        Date expirationDate = new Date(System.currentTimeMillis() + TokenConstant.EXPIRETIME_REFRESH * 60 * 60 * 1000);
        return Jwts.builder().setClaims(claims).setExpiration(expirationDate)
            .signWith(SignatureAlgorithm.HS512, TokenConstant.SECRET).compact();
    }

    /**
     * 从令牌中获取数据声明
     *
     * @param token
     *            令牌
     * @return 数据声明
     */
    public static Claims getClaimsFromToken(String token) {
        Claims claims;
        try {
            claims = Jwts.parser().setSigningKey(TokenConstant.SECRET).parseClaimsJws(token).getBody();
        } catch (Exception e) {
            claims = null;
        }
        return claims;
    }

    /**
     * 生成令牌
     *
     * @param loginUserInfoVO
     *            用户
     * @return 令牌
     */
    public static String generateToken(HuaChengSysUser loginUserInfoVO) {
        Map<String, Object> claims = new HashMap<>(2);
        claims.put("sub", loginUserInfoVO.getUserId());
        claims.put("created", new Date());
        claims.put("type", loginUserInfoVO.getType());
        return generateToken(claims);
    }

    /**
     * 从令牌中获取用户名
     *
     * @param token
     *            令牌
     * @return 用户名
     */
    public static String getUsernameFromToken(String token) {
        String username;
        try {
            Claims claims = getClaimsFromToken(token);
            username = claims.getSubject();
        } catch (Exception e) {
            username = null;
        }
        return username;
    }

    /**
     * 判断令牌是否过期
     *
     * @param token
     *            令牌
     * @return 是否过期
     */
    public static Boolean isTokenExpired(String token) {
        try {
            Claims claims = getClaimsFromToken(token);
            Date expiration = claims.getExpiration();
            return expiration.before(new Date());
        } catch (Exception e) {
            return true;
        }
    }

    /**
     * 刷新令牌
     *
     * @param token
     *            原令牌
     * @return 新令牌
     */
    public static String refreshToken(String token) {
        String refreshedToken;
        try {
            Claims claims = getClaimsFromToken(token);
            claims.put("created", new Date());
            refreshedToken = generateToken(claims);
        } catch (Exception e) {
            refreshedToken = null;
        }
        return refreshedToken;
    }

    /**
     * 验证令牌
     *
     * @param token
     *            令牌
     * @param loginUserInfoVO
     *            用户
     * @return 是否有效
     */
    public static Boolean validateToken(String token, HuaChengSysUser loginUserInfoVO) {
        String username = getUsernameFromToken(token);
        return (username.equals(loginUserInfoVO.getUserId()) && !isTokenExpired(token));
    }

    public static void main(String[] args) {
        Claims claims = JWTTokenUtil.getClaimsFromToken(
            "eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOjIsInR5cGUiOjEsImV4cCI6MTYwNjM1NzkzOSwiY3JlYXRlZCI6MTYwNjM1NjEzOTEzN30.zIj31TLHk4B9F45OszrJWfOlhZL5CWviP2RgsFP6LZuci6MlPn0iVbekioP01DRsu59mWd5FMyhd9WLvMtfxMg");
        Boolean tokenExpired = JWTTokenUtil.isTokenExpired(
            "eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOjIsInR5cGUiOjEsImV4cCI6MTYwNjM2MDQzNSwiY3JlYXRlZCI6MTYwNjM1ODYzNTI3MX0.7R3SG6hu-sr_KiPpgepubl_1FdaooCNJ0URHWv6Jynr7m8JIar2kUAnhHfWOfHrNILQb5Q-nqxceXdavcuVOXg");
        System.out.println(claims);
    }

    /**
     * 生成刷新token
     * 
     * @param loginUserInfoVO
     *            登录用户基本信息
     * @return refreshtoken
     */
    public static String generateRefeshToken(HuaChengSysUser loginUserInfoVO) {
        Map<String, Object> claims = new HashMap<>(2);
        claims.put("sub", loginUserInfoVO.getUserId());
        claims.put("created", new Date());
        claims.put("type", loginUserInfoVO.getType());
        return generateTokenRefreshToken(claims);
    }

}