1 files changed, 100 insertions, 0 deletions
diff --git a/ecs/src/event.rs b/ecs/src/event.rs
index 9cea807..2934b82 100644
--- a/ecs/src/event.rs
+++ b/ecs/src/event.rs
@@ -1 +1,101 @@
+use crate::lock::Lock;
+use crate::pair::Pair;
+use crate::uid::{Kind as UidKind, Uid};
+use crate::util::VecExt;
+use crate::World;
+
 pub mod component;
+
+#[derive(Debug, Clone)]
+#[non_exhaustive]
+pub struct Emitted<'a>
+{
+    pub event: Uid,
+    pub match_ids: &'a [Uid],
+}
+
+#[derive(Debug)]
+pub struct Submitter<'world>
+{
+    new_events: &'world Lock<NewEvents>,
+}
+
+impl<'world> Submitter<'world>
+{
+    /// Submits a event to be handled later.
+    ///
+    /// # Panics
+    /// Will panic if unable to acquire a read-write lock to the event store.
+    pub fn submit_event(&self, event: &Pair<Uid, Uid>, match_id: Uid)
+    {
+        let mut new_events_lock = self
+            .new_events
+            .write_nonblock()
+            .expect("Failed to acquire read-write lock to new events");
+
+        new_events_lock.push_event_match(event, match_id);
+    }
+
+    pub(crate) fn new(world: &'world World) -> Self
+    {
+        Self { new_events: &world.data.new_events }
+    }
+}
+
+#[derive(Debug, Default)]
+pub(crate) struct NewEvents
+{
+    events: Vec<(Uid, Matches)>,
+}
+
+impl NewEvents
+{
+    pub fn push_event_match(&mut self, event: &Pair<Uid, Uid>, match_id: Uid)
+    {
+        let event_id = event.id();
+
+        assert_eq!(event_id.kind(), UidKind::Pair);
+
+        if let Ok(event_index) = self
+            .events
+            .binary_search_by_key(&event_id, |(other_event_id, _)| *other_event_id)
+        {
+            let Some((_, matches)) = self.events.get_mut(event_index) else {
+                unreachable!();
+            };
+
+            matches.sorted_push(match_id);
+
+            return;
+        }
+
+        self.events.insert_at_partition_point_by_key(
+            (event_id, Matches { match_ids: Vec::from([match_id]) }),
+            |(other_event_id, _)| *other_event_id,
+        );
+    }
+
+    pub fn take(&mut self) -> Vec<(Uid, Matches)>
+    {
+        std::mem::take(&mut self.events)
+    }
+}
+
+#[derive(Debug)]
+pub(crate) struct Matches
+{
+    pub match_ids: Vec<Uid>,
+}
+
+impl Matches
+{
+    fn sorted_push(&mut self, match_id: Uid)
+    {
+        if self.match_ids.binary_search(&match_id).is_ok() {
+            return;
+        }
+
+        self.match_ids
+            .insert_at_partition_point_by_key(match_id, |other_match_id| *other_match_id);
+    }
+}