package middlewares

import (
	"crypto/rand"
	"encoding/hex"

	"github.com/gin-gonic/gin"
)

const RequestIDHeader = "X-Request-ID"

func RequestID() gin.HandlerFunc {
	return func(c *gin.Context) {
		requestID := c.GetHeader(RequestIDHeader)
		if requestID == "" {
			value := make([]byte, 16)
			if _, err := rand.Read(value); err == nil {
				requestID = hex.EncodeToString(value)
			}
		}
		c.Set("request_id", requestID)
		c.Header(RequestIDHeader, requestID)
		c.Next()
	}
}