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package com.sigito.backend.util;

import com.sigito.backend.entity.Utilisateur;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.security.Keys;
import lombok.Data;
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;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Function;

@Component
@Data
public class JwtUtil {

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

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

    // ===== GENERATE TOKEN =====
    public String generateToken(Utilisateur user) {

        Map<String, Object> claims = new HashMap<>();

        // ⭐ Custom Claims
        claims.put("userId", user.getId());
        claims.put("role", user.getRole().name());

        return createToken(claims, user.getUsername());
    }

    // ===== CREATE TOKEN =====
    private String createToken(Map<String, Object> claims, String subject) {

        return Jwts.builder()
                .claims(claims)
                .subject(subject)
                .issuedAt(new Date(System.currentTimeMillis()))
                .expiration(new Date(System.currentTimeMillis() + expiration))
                .signWith(getSigningKey())
                .compact();
    }

    // ===== EXTRACT CLAIMS =====
    public String extractUsername(String token) {
        return extractClaim(token, Claims::getSubject);
    }

    public Long extractUserId(String token) {
        return extractAllClaims(token).get("userId", Long.class);
    }

    public String extractRole(String token) {
        return extractAllClaims(token).get("role", String.class);
    }

    public Date extractExpiration(String token) {
        return extractClaim(token, Claims::getExpiration);
    }

    // ===== VALIDATION =====
    public Boolean isTokenExpired(String token) {
        return extractExpiration(token).before(new Date());
    }

    public Boolean validateToken(String token, String username) {
        final String extractedUsername = extractUsername(token);
        return extractedUsername.equals(username) && !isTokenExpired(token);
    }

    // ===== GENERIC CLAIM EXTRACTION =====
    private <T> T extractClaim(String token, Function<Claims, T> claimsResolver) {

        final Claims claims = extractAllClaims(token);
        return claimsResolver.apply(claims);
    }

    private Claims extractAllClaims(String token) {

        return Jwts.parser()
                .verifyWith(getSigningKey())
                .build()
                .parseSignedClaims(token)
                .getPayload();
    }

    private SecretKey getSigningKey() {

        byte[] keyBytes = secret.getBytes(StandardCharsets.UTF_8);
        return Keys.hmacShaKeyFor(keyBytes);
    }
}