feat: media duplicate purge, part 2 of 3: the automatic purge scheduler (Go only)

internal/infrastructure/useCases/PurgeScheduler.go

@@ -0,0 +1,35 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/purge"
+	"time"
+)
+
+type PurgeRunner interface {
+	Run(fingerprint *string) (purge.RunResult, error)
+}
+
+type PurgeSchedulerUseCase struct {
+	repository purge.Repository
+	runner     PurgeRunner
+}
+
+func NewPurgeSchedulerUseCase(repository purge.Repository, runner PurgeRunner) *PurgeSchedulerUseCase {
+	return &PurgeSchedulerUseCase{repository, runner}
+}
+
+func (u *PurgeSchedulerUseCase) Tick(now time.Time) (purge.RunResult, bool, error) {
+	settings, err := u.repository.Get()
+	if err != nil {
+		return purge.RunResult{}, false, err
+	}
+	next := settings.NextPurgeAt()
+	if next == nil || now.Before(*next) {
+		return purge.RunResult{}, false, nil
+	}
+	result, err := u.runner.Run(nil)
+	if err != nil {
+		return purge.RunResult{}, false, err
+	}
+	return result, true, nil
+}