package com.sinata.appointment.config;

import com.sinata.appointment.service.OpLogApplicationService;
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.UUID;
import org.slf4j.MDC;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;

@Component
@Order(Ordered.HIGHEST_PRECEDENCE)
public class TraceIdFilter extends OncePerRequestFilter {

    @Override
    protected void doFilterInternal(
            HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
            throws ServletException, IOException {
        String traceId = request.getHeader("X-Trace-Id");
        if (traceId == null || traceId.isBlank()) {
            traceId = UUID.randomUUID().toString().replace("-", "");
        }
        MDC.put(OpLogApplicationService.MDC_TRACE, traceId);
        response.setHeader("X-Trace-Id", traceId);
        try {
            filterChain.doFilter(request, response);
        } finally {
            MDC.remove(OpLogApplicationService.MDC_TRACE);
        }
    }
}