package com.sandu.common.security.token;

import com.sandu.common.enums.AdminStatusStatus;
import com.sandu.common.execption.BusinessException;
import com.sandu.common.redis.RedisService;
import com.sandu.common.security.LoginUserInfo;
import com.sandu.common.security.config.SecurityProperties;
import com.sandu.common.util.SpringContextHolder;
import io.jsonwebtoken.*;
import io.jsonwebtoken.io.Decoders;
import io.jsonwebtoken.io.DecodingException;
import io.jsonwebtoken.security.Keys;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.boot.autoconfigure.cache.CacheProperties;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Component;

import java.security.Key;
import java.util.Date;
import java.util.stream.Collectors;

/**
 * @author chenjiantian
 * @date 2022/1/8 18:12
 */
@Component
@Slf4j
@ConditionalOnProperty(prefix = "sandu.jwt", name = "cache-online", havingValue = "false")
public class JwtTokenProvider implements TokenProvider, InitializingBean {

    private static final String AUTHORITIES_KEY = "auth";
    private static final String CREDENTIALS_KEY = "cred";
    private static final String ADMINISTRATOR_KEY = "admin";
    private final SecurityProperties properties;
    private Key key;

    public JwtTokenProvider(SecurityProperties properties) {
        this.properties = properties;
    }

    @Override
    public void afterPropertiesSet() {
        byte[] keyBytes = Decoders.BASE64.decode(properties.getBase64Secret());
        this.key = Keys.hmacShaKeyFor(keyBytes);
    }

    @Override
    public String createToken(LoginUserInfo loginUserInfo) {
        if (loginUserInfo.getUserId() == null) {
            throw new IllegalArgumentException("用户id不能为空");
        }
        RedisService redisService = SpringContextHolder.getBean(RedisService.class);
        String authorities = loginUserInfo.getAuthorities().stream()
                .map(GrantedAuthority::getAuthority)
                .collect(Collectors.joining(","));

        long now = (new Date()).getTime();
        Date expiration = new Date(now + properties.getTokenValidityInSeconds());
        String token = Jwts.builder()
                .setSubject(loginUserInfo.getUserId().toString())
                .claim(AUTHORITIES_KEY, authorities)
                .claim(CREDENTIALS_KEY, loginUserInfo.getAccount())
                .claim(ADMINISTRATOR_KEY, loginUserInfo.getAdministratorType())
                .setExpiration(expiration)
                .signWith(key, SignatureAlgorithm.HS512)
                .compact();

        String key = String.format("%d_%d", loginUserInfo.getUserId(), loginUserInfo.getAdministratorType());
        redisService.set(key, token, 2592000);
        return token;
    }

    @Override
    public LoginUserInfo validateToken(String token) {
        try {
            RedisService redisService = SpringContextHolder.getBean(RedisService.class);

            Claims claims = Jwts.parserBuilder().setSigningKey(key).build().parseClaimsJws(token).getBody();
            LoginUserInfo loginUserInfo = new LoginUserInfo();
            loginUserInfo.setUserId(Long.valueOf(claims.getSubject()));
            loginUserInfo.setAccount(String.valueOf(claims.get(CREDENTIALS_KEY)));
            loginUserInfo.setPermission(claims.get(AUTHORITIES_KEY).toString());
            loginUserInfo.setAdministratorType(Integer.parseInt(claims.get(ADMINISTRATOR_KEY).toString()));
            loginUserInfo.setToken(token);
            loginUserInfo.setStatus(AdminStatusStatus.NORMAL.getCode());
            String key = String.format("%d_%d", loginUserInfo.getUserId(), loginUserInfo.getAdministratorType());
            String redisToken = String.valueOf(redisService.get(key));
            if (redisToken == null || !token.equals(redisToken)) {
                throw new BusinessException("token无效");
            }
            return loginUserInfo;
        } catch (io.jsonwebtoken.security.SecurityException | MalformedJwtException e) {
            log.info("Invalid JWT signature.");
        } catch (ExpiredJwtException e) {
            log.info("Expired JWT token.");
        } catch (UnsupportedJwtException | DecodingException e) {
            log.info("Unsupported JWT token.");
        } catch (IllegalArgumentException e) {
            log.info("JWT token compact of handler are invalid.");
        }

        return null;
    }
}