package middleware

import (
	"net/http"

	"git.toowon.com/jimmy/go-common/logger"
	"github.com/google/uuid"
)

// RequestID 为每个请求生成或透传 Request ID，写入 context 与响应头
func RequestID() func(http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			id := r.Header.Get("X-Request-ID")
			if id == "" {
				id = uuid.NewString()
			}
			w.Header().Set("X-Request-ID", id)
			ctx := logger.WithRequestID(r.Context(), id)
			next.ServeHTTP(w, r.WithContext(ctx))
		})
	}
}