refactor: add entry duration splitting as a method

internal/pkg/worklog/entry.go

@@ -2,6 +2,7 @@ package worklog
 
 import (
 	"fmt"
+	"math"
 	"time"
 )
 
@@ -46,3 +47,10 @@ func (e *Entry) IsComplete() bool {
 
 	return isMetadataFilled && isTimeFilled
 }
+
+// SplitDuration splits the billable and unbillable duration to N parts.
+func (e *Entry) SplitDuration(parts int) (splitBillableDuration time.Duration, splitUnbillableDuration time.Duration) {
+	splitBillableDuration = time.Duration(math.Round(float64(e.BillableDuration.Nanoseconds()) / float64(parts)))
+	splitUnbillableDuration = time.Duration(math.Round(float64(e.UnbillableDuration.Nanoseconds()) / float64(parts)))
+	return splitBillableDuration, splitUnbillableDuration
+}

internal/pkg/worklog/entry_test.go

@@ -88,3 +88,18 @@ func TestEntryIsCompleteIncomplete(t *testing.T) {
 	entry.UnbillableDuration = 0
 	assert.False(t, entry.IsComplete())
 }
+
+func TestEntry_SplitDuration(t *testing.T) {
+	var splitBillable time.Duration
+	var splitUnbillable time.Duration
+	entry := getTestEntry()
+
+	splitBillable, splitUnbillable = entry.SplitDuration(1)
+	assert.Equal(t, entry.BillableDuration, splitBillable)
+	assert.Equal(t, entry.UnbillableDuration, splitUnbillable)
+
+	entry.UnbillableDuration = time.Hour * 2
+	splitBillable, splitUnbillable = entry.SplitDuration(2)
+	assert.Equal(t, time.Hour*1, splitBillable)
+	assert.Equal(t, time.Hour*1, splitUnbillable)
+}