From 9ec483593028a6eefd7cd99911f8960a629d1a90 Mon Sep 17 00:00:00 2001
From: Yevhen Pavlov <yevhen.pavlov.ua@gmail.com>
Date: Sun, 7 Apr 2024 14:32:22 +0300
Subject: [PATCH] feat: Dynamic shift of working hours don't exceed end time or
 precede start time

---
 internal/utils/utils.go | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/internal/utils/utils.go b/internal/utils/utils.go
index 631c0fa..ae276a2 100644
--- a/internal/utils/utils.go
+++ b/internal/utils/utils.go
@@ -35,8 +35,12 @@ func IsInWorkingHours(timeWindow string) bool {
 		return true
 	}
 
-	startTimeBefore := MakeRandomTime(parts[0])
-	endTimeAfter := MakeRandomTime(parts[1])
+	// Generate a datetime 3-14 minutes earlier than the specified time
+	startTimeBefore := addRandomTimeInterval(parts[0])
+
+	// Generate a datetime 3-14 minutes later than the specified time
+	endTimeAfter := subtractRandomTimeInterval(parts[1])
+
 	currentTime := time.Now()
 
 	// Check if the current time is within the dynamic range
@@ -46,7 +50,15 @@ func IsInWorkingHours(timeWindow string) bool {
 	return false
 }
 
-func MakeRandomTime(inputTime string) time.Time {
+func addRandomTimeInterval(inputTime string) time.Time {
+	return makeRandomTime(inputTime, true)
+}
+
+func subtractRandomTimeInterval(inputTime string) time.Time {
+	return makeRandomTime(inputTime, false)
+}
+
+func makeRandomTime(inputTime string, isPositive bool) time.Time {
 	// Parse input time like 19:00 to date time
 	parsedTime, err := time.Parse(timeLayout, inputTime)
 	if err != nil {
@@ -58,7 +70,7 @@ func MakeRandomTime(inputTime string) time.Time {
 	randomInterval := time.Duration(rand.N(12)+3) * time.Minute
 
 	// Randomly decide whether to add or subtract the interval
-	if rand.N(2) == 0 {
+	if isPositive {
 		parsedTime = parsedTime.Add(randomInterval)
 	} else {
 		parsedTime = parsedTime.Add(-randomInterval)