1 files changed, 38 insertions, 2 deletions
diff --git a/src/events/types.rs b/src/events/types.rs
index 6747afc..7c0e0a4 100644
--- a/src/events/types.rs
+++ b/src/events/types.rs
@@ -11,6 +11,7 @@ use crate::{
 
 #[derive(
     Debug,
+    Default,
     Eq,
     Ord,
     PartialEq,
@@ -59,7 +60,30 @@ impl ResumePoint {
         let Self(elements) = self;
         elements.get(channel).copied()
     }
+
+    pub fn not_after(&self, event: impl ResumeElement) -> bool {
+        let Self(elements) = self;
+        let (channel, sequence) = event.element();
+
+        elements
+            .get(channel)
+            .map_or(true, |resume_at| resume_at < &sequence)
+    }
 }
+
+pub trait ResumeElement {
+    fn element(&self) -> (&channel::Id, Sequence);
+}
+
+impl<T> ResumeElement for &T
+where
+    T: ResumeElement,
+{
+    fn element(&self) -> (&channel::Id, Sequence) {
+        (*self).element()
+    }
+}
+
 #[derive(Clone, Debug)]
 pub struct ResumableEvent(pub ResumePoint, pub ChannelEvent);
 
@@ -74,14 +98,26 @@ pub struct ChannelEvent {
 }
 
 impl ChannelEvent {
-    pub fn sequence(&self) -> ResumePoint {
-        ResumePoint::singleton(&self.channel.id, self.sequence)
+    pub fn created(channel: Channel) -> Self {
+        Self {
+            at: channel.created_at,
+            sequence: Sequence::default(),
+            channel,
+            data: ChannelEventData::Created,
+        }
+    }
+}
+
+impl ResumeElement for ChannelEvent {
+    fn element(&self) -> (&channel::Id, Sequence) {
+        (&self.channel.id, self.sequence)
     }
 }
 
 #[derive(Clone, Debug, Eq, PartialEq, serde::Serialize)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum ChannelEventData {
+    Created,
     Message(MessageEvent),
 }