package middleware

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

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

const TraceIDKey = "traceId"

func Trace() gin.HandlerFunc {
	return func(c *gin.Context) {
		b := make([]byte, 8)
		_, _ = rand.Read(b)
		traceID := hex.EncodeToString(b)

		c.Set(TraceIDKey, traceID)
		c.Writer.Header().Set("X-Trace-Id", traceID)
		c.Next()
	}
}

func GetTraceID(c *gin.Context) string {
	if v, ok := c.Get(TraceIDKey); ok {
		if s, ok := v.(string); ok {
			return s
		}
	}
	return ""
}