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.Authentication;
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 {
        System.out.println("=== JWT过滤器被调用 === URI: " + request.getRequestURI());
        logger.debug("JWT过滤器开始处理请求: {}", request.getRequestURI());
        
        String authHeader = request.getHeader("Authorization");
        String token = null;
        Long userId = null;

        logger.debug("Authorization头: {}", authHeader);

        // 从请求头中提取JWT token
        if (authHeader != null && authHeader.startsWith("Bearer ")) {
            token = authHeader.substring(7);
            logger.debug("提取到JWT token: {}", token.substring(0, Math.min(20, token.length())) + "...");
            try {
                userId = jwtUtil.getUserIdFromToken(token);
                logger.debug("从token中解析到用户ID: {}", userId);
            } catch (Exception e) {
                logger.error("JWT token解析失败: {}", e.getMessage(), e);
            }
        } else {
            logger.debug("没有找到Authorization头或格式不正确");
        }

        // 如果token有效且当前是匿名或无认证，则进行认证
        Authentication existingAuth = SecurityContextHolder.getContext().getAuthentication();
        boolean isAnonymous = (existingAuth == null) || ("anonymousUser".equals(String.valueOf(existingAuth.getPrincipal())));
        if (userId != null && isAnonymous) {
            logger.debug("开始验证token有效性");
            
            // 验证token是否有效
            if (jwtUtil.validateToken(token)) {
                logger.debug("Token验证成功，查找用户信息");
                
                // 查找用户信息
                Optional<User> userOpt = userRepository.findById(userId);
                if (userOpt.isPresent()) {
                    User user = userOpt.get();
                    logger.debug("找到用户: userId={}, phone={}", user.getId(), user.getPhone());
                    
                    // 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.info("用户认证成功: userId={}, phone={}", user.getId(), user.getPhone());
                } else {
                    logger.warn("用户不存在: userId={}", userId);
                }
            } else {
                logger.warn("Token验证失败");
            }
        } else if (userId == null) {
            logger.debug("没有解析到用户ID");
        } else {
            logger.debug("已存在非匿名认证信息，跳过JWT认证");
        }

        filterChain.doFilter(request, response);
    }
}