1 files changed, 63 insertions, 0 deletions
diff --git a/storage/link.go b/storage/link.go
new file mode 100644
index 0000000..f334f42
--- /dev/null
+++ b/storage/link.go
@@ -0,0 +1,63 @@
+package storage
+
+import (
+	"encoding/json"
+	"errors"
+	"github.com/google/uuid"
+	"time"
+)
+
+type Link struct {
+	Id        uuid.UUID
+	Target    string
+	OpensFrom time.Time
+	OpensLeft int
+}
+
+var Null = uuid.UUID{}
+
+func (l Link) Save(storage Storage[Link, uuid.UUID]) (uuid.UUID, error) {
+	return storage.Save(l)
+}
+
+func (l Link) Serialize() ([]byte, error) {
+	return json.Marshal(l)
+}
+
+func (l Link) Use() error {
+	if e := l.Valid(); e != nil {
+		return e
+	}
+
+	remaining := l.OpensLeft - 1
+	if remaining < 1 {
+		_ = Current.Delete(l)
+		return nil
+	}
+	n := Link{
+		Id:        l.Id,
+		Target:    l.Target,
+		OpensFrom: l.OpensFrom,
+		OpensLeft: remaining,
+	}
+	return n.Update(Current)
+}
+
+func (l Link) Update(storage Storage[Link, uuid.UUID]) error {
+	return storage.Update(l)
+}
+
+var NoOpensError = errors.New("no opens left")
+var NotYetOpenError = errors.New("not yet open")
+
+func (l Link) Valid() error {
+	if l.OpensLeft < 1 {
+		return NoOpensError
+	}
+
+	if time.Now().Before(l.OpensFrom) {
+		return NotYetOpenError
+	}
+
+	return nil
+}