package com.evseminar.security;

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

import javax.crypto.SecretKey;
import java.nio.charset.StandardCharsets;
import java.util.Date;

@Component
public class JwtTokenProvider {

    private final SecretKey key;
    private final long expirationMs;

    public JwtTokenProvider(
            @Value("${jwt.secret}") String secret,
            @Value("${jwt.expiration-ms}") long expirationMs) {
        this.key = Keys.hmacShaKeyFor(secret.getBytes(StandardCharsets.UTF_8));
        this.expirationMs = expirationMs;
    }

    public String generateToken(Long customerId, String email, String role) {
        Date now = new Date();
        Date expiry = new Date(now.getTime() + expirationMs);

        return Jwts.builder()
                .subject(customerId.toString())
                .claim("email", email)
                .claim("role", role)
                .issuedAt(now)
                .expiration(expiry)
                .signWith(key)
                .compact();
    }

    public Long getCustomerIdFromToken(String token) {
        Claims claims = Jwts.parser()
                .verifyWith(key)
                .build()
                .parseSignedClaims(token)
                .getPayload();
        return Long.parseLong(claims.getSubject());
    }

    public String getRoleFromToken(String token) {
        Claims claims = Jwts.parser()
                .verifyWith(key)
                .build()
                .parseSignedClaims(token)
                .getPayload();
        return claims.get("role", String.class);
    }

    public boolean validateToken(String token) {
        try {
            Jwts.parser().verifyWith(key).build().parseSignedClaims(token);
            return true;
        } catch (JwtException | IllegalArgumentException e) {
            return false;
        }
    }
}