package fr.eni.demo.bll;

import io.jsonwebtoken.JwtException;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import io.jsonwebtoken.security.Keys;
import org.springframework.stereotype.Service;

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

@Service
public class JwtService {

    private static final long EXPIRATION_TIME = 86400000; // 1j
    private final Key key = Keys.secretKeyFor(SignatureAlgorithm.HS256);

    public String generateToken(String username) {
        return Jwts.builder()
                .setSubject(username)
                .setIssuedAt(new Date())
                .setExpiration(new Date(System.currentTimeMillis() + EXPIRATION_TIME))
                .signWith(key)
                .compact();
    }

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

    public boolean isTokenValid(String token) {
        try {
            Jwts.parserBuilder().setSigningKey(key).build().parseClaimsJws(token);
            return true;
        } catch (JwtException e) {
            return false;
        }
    }
}