package com.bvrit.vtp.service;

import io.jsonwebtoken.*;
import io.jsonwebtoken.security.Keys;
import jakarta.annotation.*;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

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

@Service
public class JwtService {
    @Value("${jwt.secret}")
    private String secret;

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

    @Value("${jwt.refresh-expiration}")
    private long refreshExpiration;

    private Key key;

    @PostConstruct
    public void init() {
        key = Keys.hmacShaKeyFor(secret.getBytes());
    }

    public String generateToken(String email, String role, boolean isRefresh) {
        return Jwts.builder()
                .setSubject(email)
                .claim("role", role)
                .setIssuedAt(new Date(System.currentTimeMillis()))
                .setExpiration(new Date(System.currentTimeMillis() + (isRefresh ? refreshExpiration : expiration)))
                .signWith(key, SignatureAlgorithm.HS256)
                .compact();
    }

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

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

    public String getEmail(String token) {
        return extractClaims(token).getSubject();
    }

    public String getRole(String token) {
        return extractClaims(token).get("role", String.class);
    }
}