From e01a9cd9965142d5a4d4dd328168f1444cb0a5df Mon Sep 17 00:00:00 2001
From: Fredrik Oseberg <fredrik.no@gmail.com>
Date: Wed, 27 Sep 2023 10:41:59 +0200
Subject: [PATCH] fix: add warning

---
 client.go |  3 +++
 utils.go  | 13 +++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/client.go b/client.go
index d4d1a71..0b929d0 100644
--- a/client.go
+++ b/client.go
@@ -340,10 +340,13 @@ func (uc *Client) isEnabled(feature string, options ...FeatureOption) api.Strate
 }
 
 func (uc *Client) isParentDependencySatisfied(feature *api.Feature, context context.Context) bool {
+	warnOnce := &WarnOnce{}
+
 	for _, parent := range *feature.Dependencies {
 		parentToggle := uc.repository.getToggle(parent.Feature)
 
 		if parentToggle == nil {
+			warnOnce.Warn("the parent toggle was not found in the cache, the evaluation of this dependency will always be false")
 			return false
 		}
 
diff --git a/utils.go b/utils.go
index 9e2eebf..8ba2c36 100644
--- a/utils.go
+++ b/utils.go
@@ -5,6 +5,7 @@ import (
 	"math/rand"
 	"os"
 	"os/user"
+	"sync"
 	"time"
 )
 
@@ -43,3 +44,15 @@ func contains(arr []string, str string) bool {
 	}
 	return false
 }
+
+// WarnOnce is a type for handling warnings that should only be displayed once.
+type WarnOnce struct {
+	once sync.Once
+}
+
+// Warn logs the warning message once.
+func (wo *WarnOnce) Warn(message string) {
+	wo.once.Do(func() {
+		fmt.Println("Warning:", message)
+	})
+}