package com.linghu.utils;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import com.linghu.model.entity.User;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.ExpiredJwtException;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.MalformedJwtException;
import io.jsonwebtoken.SignatureAlgorithm;
import io.jsonwebtoken.UnsupportedJwtException;
import io.jsonwebtoken.security.Keys;
import io.jsonwebtoken.security.SignatureException;

import javax.crypto.SecretKey;
import java.util.Date;
import java.util.Map;

@Component
public class JwtUtils {
    @Value("${jwt.secret}")
    private final String secret;

    @Value("${jwt.expiration}")
    private final Long expiration;

    // 生成安全的密钥
    private SecretKey getSigningKey() {
        return Keys.hmacShaKeyFor(secret.getBytes());
    }

    // 通过构造函数注入配置值
    public JwtUtils(
            @Value("${jwt.secret}") String secret,
            @Value("${jwt.expiration}") long expiration) {

        this.secret = secret;
        this.expiration = expiration;
    }

    public String generateToken(User user) {
        SecretKey key = Keys.hmacShaKeyFor(secret.getBytes());

        return Jwts.builder()
                .setSubject(user.getUser_name())
                .claim("email", user.getUser_email())
                .claim("password", user.getPassword())
                .setIssuedAt(new Date())
                .setExpiration(new Date(System.currentTimeMillis() + expiration * 1000))
                .signWith(key, SignatureAlgorithm.HS256)
                .compact();
    }

    public User parseToken(String token)
            throws ExpiredJwtException, UnsupportedJwtException,
            MalformedJwtException, SignatureException, IllegalArgumentException {

        Claims claims = Jwts.parser()
                .setSigningKey(getSigningKey())
                .build()
                .parseClaimsJws(token)
                .getBody();

        // 创建User对象并填充数据
        User user = new User();
        user.setUser_name(claims.getSubject()); // 主题是用户名
        user.setUser_email(claims.get("email", String.class));
        user.setPassword( claims.get("password", String.class));

        // 添加角色信息（如果存在）
        // if (claims.containsKey("roles")) {
        // user.setRoles(claims.get("roles", String.class));
        // }

        return user;
    }

    public boolean validateToken(String token) {
        try {
            parseToken(token);
            return true;
        } catch (Exception e) {
            return false;
        }
    }
}