webhooks (#1)

Reviewed-on: #1

k-tv-backend/domain/src/events.rs

@@ -0,0 +1,112 @@
+//! Domain events emitted when important state transitions occur.
+//!
+//! These are pure data — no I/O, no tokio deps. The transport
+//! (tokio::sync::broadcast) lives in `api`; domain only owns the schema.
+
+use uuid::Uuid;
+use crate::entities::{Channel, GeneratedSchedule, ScheduledSlot};
+
+/// Events emitted by the application when important state changes occur.
+///
+/// Must be `Clone + Send + 'static` for use as a `broadcast::channel` item.
+#[derive(Clone)]
+pub enum DomainEvent {
+    BroadcastTransition {
+        channel_id: Uuid,
+        slot: ScheduledSlot,
+    },
+    NoSignal {
+        channel_id: Uuid,
+    },
+    ScheduleGenerated {
+        channel_id: Uuid,
+        schedule: GeneratedSchedule,
+    },
+    ChannelCreated {
+        channel: Channel,
+    },
+    ChannelUpdated {
+        channel: Channel,
+    },
+    ChannelDeleted {
+        channel_id: Uuid,
+    },
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use uuid::Uuid;
+
+    fn make_slot() -> crate::entities::ScheduledSlot {
+        use crate::entities::{MediaItem, ScheduledSlot};
+        use crate::value_objects::{ContentType, MediaItemId};
+        use chrono::Utc;
+        ScheduledSlot {
+            id: Uuid::new_v4(),
+            start_at: Utc::now(),
+            end_at: Utc::now() + chrono::Duration::minutes(30),
+            item: MediaItem {
+                id: MediaItemId::new("test-item".to_string()),
+                title: "Test Movie".to_string(),
+                content_type: ContentType::Movie,
+                duration_secs: 1800,
+                description: None,
+                genres: vec![],
+                year: None,
+                tags: vec![],
+                series_name: None,
+                season_number: None,
+                episode_number: None,
+            },
+            source_block_id: Uuid::new_v4(),
+        }
+    }
+
+    #[test]
+    fn broadcast_transition_carries_slot() {
+        let channel_id = Uuid::new_v4();
+        let slot = make_slot();
+        let event = DomainEvent::BroadcastTransition { channel_id, slot: slot.clone() };
+        match event {
+            DomainEvent::BroadcastTransition { channel_id: cid, slot: s } => {
+                assert_eq!(cid, channel_id);
+                assert_eq!(s.item.title, "Test Movie");
+            }
+            _ => panic!("wrong variant"),
+        }
+    }
+
+    #[test]
+    fn no_signal_carries_channel_id() {
+        let channel_id = Uuid::new_v4();
+        let event = DomainEvent::NoSignal { channel_id };
+        match event {
+            DomainEvent::NoSignal { channel_id: cid } => assert_eq!(cid, channel_id),
+            _ => panic!("wrong variant"),
+        }
+    }
+
+    #[test]
+    fn schedule_generated_carries_metadata() {
+        use crate::entities::GeneratedSchedule;
+        use chrono::Utc;
+        let channel_id = Uuid::new_v4();
+        let schedule = GeneratedSchedule {
+            id: Uuid::new_v4(),
+            channel_id,
+            valid_from: Utc::now(),
+            valid_until: Utc::now() + chrono::Duration::hours(48),
+            generation: 3,
+            slots: vec![],
+        };
+        let event = DomainEvent::ScheduleGenerated { channel_id, schedule: schedule.clone() };
+        match event {
+            DomainEvent::ScheduleGenerated { schedule: s, .. } => {
+                assert_eq!(s.generation, 3);
+                assert_eq!(s.slots.len(), 0);
+            }
+            _ => panic!("wrong variant"),
+        }
+    }
+}