package com.rongyichuang.auth.filter;

import com.rongyichuang.auth.util.JwtUtil;
import com.rongyichuang.user.entity.User;
import com.rongyichuang.user.repository.UserRepository;
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Optional;

/**
 * JWT认证过滤器
 */
@Component
public class JwtAuthenticationFilter extends OncePerRequestFilter {

    private static final Logger logger = LoggerFactory.getLogger(JwtAuthenticationFilter.class);

    @Autowired
    private JwtUtil jwtUtil;

    @Autowired
    private UserRepository userRepository;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, 
                                  FilterChain filterChain) throws ServletException, IOException {
        
        String authHeader = request.getHeader("Authorization");
        String token = null;
        Long userId = null;

        // 从请求头中提取JWT token
        if (authHeader != null && authHeader.startsWith("Bearer ")) {
            token = authHeader.substring(7);
            try {
                userId = jwtUtil.getUserIdFromToken(token);
            } catch (Exception e) {
                logger.debug("JWT token解析失败: {}", e.getMessage());
            }
        }

        // 如果token有效且当前没有认证信息
        if (userId != null && SecurityContextHolder.getContext().getAuthentication() == null) {
            
            // 验证token是否有效
            if (jwtUtil.validateToken(token)) {
                
                // 查找用户信息
                Optional<User> userOpt = userRepository.findById(userId);
                if (userOpt.isPresent()) {
                    User user = userOpt.get();
                    
                    // 创建认证对象
                    UsernamePasswordAuthenticationToken authToken = 
                        new UsernamePasswordAuthenticationToken(
                            user.getId().toString(), 
                            null, 
                            new ArrayList<>() // 暂时不设置权限，后续可以根据角色设置
                        );
                    
                    authToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                    SecurityContextHolder.getContext().setAuthentication(authToken);
                    
                    logger.debug("用户认证成功: userId={}, phone={}", user.getId(), user.getPhone());
                }
            }
        }

        filterChain.doFilter(request, response);
    }
}