//package com.xiaopeng.trafficControl.config.log;
//
//import com.xiaopeng.common.log.config.LogHeaderProperties;
//import lombok.extern.slf4j.Slf4j;
//import org.slf4j.MDC;
//import org.springframework.beans.factory.annotation.Autowired;
//import org.springframework.core.Ordered;
//import org.springframework.core.annotation.Order;
//import org.springframework.http.MediaType;
//import org.springframework.stereotype.Component;
//import org.springframework.web.filter.OncePerRequestFilter;
//import org.springframework.web.util.ContentCachingRequestWrapper;
//import org.springframework.web.util.ContentCachingResponseWrapper;
//
//import javax.servlet.FilterChain;
//import javax.servlet.ServletException;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
//import java.io.IOException;
//import java.nio.charset.StandardCharsets;
//import java.util.*;
//
///**
// * 请求/响应日志过滤器
// * 打印：traceId、method、uri、queryString、请求体、响应状态、耗时、响应体
// */
//@Slf4j
//@Component
//@Order(Ordered.HIGHEST_PRECEDENCE + 10)
//public class RequestResponseLoggingFilter extends OncePerRequestFilter {
//
//    @Autowired
//    private LogHeaderProperties logHeaderProperties;
//
//    /** 不打印 body 的路径前缀（健康检查、actuator 等） */
//    private static final Set<String> EXCLUDE_PATHS = new HashSet<>(Arrays.asList(
//            "/actuator", "/healthcheck", "/health", "/prometheus"
//    ));
//
//    /** 只对这些 Content-Type 打印 body（避免打印二进制流） */
//    private static final Set<String> LOGGABLE_CONTENT_TYPES = new HashSet<>(Arrays.asList(
//            MediaType.APPLICATION_JSON_VALUE,
//            MediaType.APPLICATION_JSON_UTF8_VALUE,
//            MediaType.TEXT_PLAIN_VALUE,
//            MediaType.TEXT_XML_VALUE,
//            MediaType.APPLICATION_XML_VALUE,
//            "application/x-www-form-urlencoded"
//    ));
//
//    private static final int MAX_BODY_LENGTH = 2000;
//
//    @Override
//    protected boolean shouldNotFilter(HttpServletRequest request) {
//        String uri = request.getRequestURI();
//        return EXCLUDE_PATHS.stream().anyMatch(uri::startsWith);
//    }
//
//    @Override
//    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
//                                    FilterChain chain) throws ServletException, IOException {
//        // 初始化 MDC（Filter 先于 Interceptor 执行，在此统一设置）
//        String traceId = request.getHeader("X-Trace-Id");
//        if (traceId == null || traceId.isEmpty()) {
//            traceId = UUID.randomUUID().toString().replace("-", "");
//        }
//        MDC.put("traceId",    traceId);
//        MDC.put("clientIp",   getClientIp(request));
//        MDC.put("requestUri", request.getRequestURI());
//        response.setHeader("X-Trace-Id", traceId);
//
//        ContentCachingRequestWrapper reqWrapper  = new ContentCachingRequestWrapper(request);
//        ContentCachingResponseWrapper respWrapper = new ContentCachingResponseWrapper(response);
//
//        long start = System.currentTimeMillis();
//        try {
//            chain.doFilter(reqWrapper, respWrapper);
//        } finally {
//            long cost = System.currentTimeMillis() - start;
//            logRequest(reqWrapper);
//            logResponse(respWrapper, cost);
//            // 必须把响应体写回，否则客户端收不到数据
//            respWrapper.copyBodyToResponse();
//            MDC.clear();
//        }
//    }
//
//    private String getClientIp(HttpServletRequest request) {
//        String ip = request.getHeader("X-Forwarded-For");
//        if (ip != null && !ip.isEmpty() && !"unknown".equalsIgnoreCase(ip)) {
//            return ip.split(",")[0].trim();
//        }
//        ip = request.getHeader("X-Real-IP");
//        if (ip != null && !ip.isEmpty() && !"unknown".equalsIgnoreCase(ip)) {
//            return ip;
//        }
//        return request.getRemoteAddr();
//    }
//
//    private void logRequest(ContentCachingRequestWrapper request) {
//        String traceId = MDC.get("traceId");
//        String uri     = request.getRequestURI();
//        String query   = request.getQueryString();
//        String method  = request.getMethod();
//        String body    = extractBody(request.getContentAsByteArray(), request.getContentType());
//
//        if (logHeaderProperties.isEnabled()) {
//            String headers = extractHeaders(request);
//            log.info(">>> [{}] {} {}{} | headers={} | body={}",
//                    traceId, method, uri,
//                    query != null ? "?" + query : "",
//                    headers, body);
//        } else {
//            log.info(">>> [{}] {} {}{} | body={}",
//                    traceId, method, uri,
//                    query != null ? "?" + query : "",
//                    body);
//        }
//    }
//
//    private String extractHeaders(HttpServletRequest request) {
//        List<String> names = logHeaderProperties.getNames();
//        StringBuilder sb = new StringBuilder("{");
//        boolean first = true;
//        if (names != null && !names.isEmpty()) {
//            // 只打印配置的请求头
//            for (String name : names) {
//                String value = request.getHeader(name);
//                if (value != null) {
//                    if (!first) sb.append(", ");
//                    first = false;
//                    sb.append(name).append("=").append(value);
//                }
//            }
//        } else {
//            // 未配置则打印全部请求头
//            Enumeration<String> headerNames = request.getHeaderNames();
//            while (headerNames != null && headerNames.hasMoreElements()) {
//                String name = headerNames.nextElement();
//                String value = request.getHeader(name);
//                if (!first) sb.append(", ");
//                first = false;
//                sb.append(name).append("=").append(value);
//            }
//        }
//        return sb.append("}").toString();
//    }
//
//    private void logResponse(ContentCachingResponseWrapper response, long cost) {
//        String traceId = MDC.get("traceId");
//        int    status  = response.getStatus();
//        String body    = extractBody(response.getContentAsByteArray(), response.getContentType());
//
//        log.info("<<< [{}] status={} cost={}ms | body={}",
//                traceId, status, cost, body);
//    }
//
//    private String extractBody(byte[] bodyBytes, String contentType) {
//        if (bodyBytes == null || bodyBytes.length == 0) {
//            return "";
//        }
//        if (!isLoggableContentType(contentType)) {
//            return "[binary, " + bodyBytes.length + " bytes]";
//        }
//        String body = new String(bodyBytes, StandardCharsets.UTF_8);
//        if (body.length() > MAX_BODY_LENGTH) {
//            body = body.substring(0, MAX_BODY_LENGTH) + "...(truncated)";
//        }
//        return body;
//    }
//
//    private boolean isLoggableContentType(String contentType) {
//        if (contentType == null) return true;
//        String ct = contentType.toLowerCase();
//        return LOGGABLE_CONTENT_TYPES.stream().anyMatch(ct::contains);
//    }
//}