package com.iespp.app.security.jwt;

import io.jsonwebtoken.*;
import io.jsonwebtoken.security.Keys;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Component;

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

@Component
public class JwtUtils {

    @Value("${jwt.secret}")
    private String jwtSecret;

    @Value("${jwt.expiration}")
    private int jwtExpirationMs;

    private Key getSigningKey() {
        return Keys.hmacShaKeyFor(jwtSecret.getBytes());
    }

    public String generateJwtToken(Authentication authentication) {
        UserDetails userPrincipal = (UserDetails) authentication.getPrincipal();

        return Jwts.builder()
                .setSubject((userPrincipal.getUsername()))
                .setIssuedAt(new Date())
                .setExpiration(new Date((new Date()).getTime() + jwtExpirationMs))
                .signWith(getSigningKey(), SignatureAlgorithm.HS256)
                .compact();
    }

    public String getUserNameFromJwtToken(String token) {
        return Jwts.parserBuilder().setSigningKey(getSigningKey()).build()
                .parseClaimsJws(token).getBody().getSubject();
    }

    public boolean validateJwtToken(String authToken) {
        try {
            Jwts.parserBuilder().setSigningKey(getSigningKey()).build().parseClaimsJws(authToken);
            return true;
        } catch (JwtException | IllegalArgumentException e) {
            System.err.println("Token JWT inválido: " + e.getMessage());
        }
        return false;
    }
}