wire interstitial insertion into schedule engine resolve_block

crates/domain/src/services/schedule/mod.rs

@@ -9,7 +9,7 @@ use crate::models::{
     ScheduledSlot,
 };
 use crate::ports::{ChannelQuery, LibraryQuery, ScheduleCommand, ScheduleQuery};
-use crate::value_objects::{BlockId, ChannelId, FillStrategy, LibrarySearchFilter, MediaItemId, RotationPolicy, Weekday};
+use crate::value_objects::{BlockId, ChannelId, FillStrategy, InterstitialRule, LibrarySearchFilter, MediaItemId, MediaRole, RotationPolicy, Weekday};
 
 mod fill;
 mod rotation;
@@ -248,10 +248,10 @@ impl ScheduleEngineService {
         window: BlockTimeWindow,
         rotation: RotationContext<'_>,
     ) -> DomainResult<Vec<ScheduledSlot>> {
-        match block.content() {
+        let program_slots = match block.content() {
             BlockContent::Manual { items } => {
                 self.resolve_manual(items, window.start, window.end, block.id())
-                    .await
+                    .await?
             }
             BlockContent::Algorithmic {
                 filter,
@@ -265,12 +265,85 @@ impl ScheduleEngineService {
                         loop_on_finish: block.loop_on_finish(),
                         ignore_rotation_policy: block.ignore_rotation_policy(),
                     },
-                    window,
+                    BlockTimeWindow {
+                        start: window.start,
+                        end: window.end,
+                    },
                     rotation,
                 )
+                .await?
+            }
+        };
+
+        if let Some(rule) = block.interstitial_rule() {
+            self.insert_interstitials(program_slots, rule, block.id(), window.end)
                 .await
+        } else {
+            Ok(program_slots)
+        }
+    }
+
+    async fn insert_interstitials(
+        &self,
+        program_slots: Vec<ScheduledSlot>,
+        rule: &InterstitialRule,
+        block_id: BlockId,
+        block_end: DateTime<Utc>,
+    ) -> DomainResult<Vec<ScheduledSlot>> {
+        if program_slots.len() < 2 {
+            return Ok(program_slots);
+        }
+
+        let mut filter = media_filter_to_library_search(rule.pool_filter());
+        filter = filter.with_role(MediaRole::Interstitial);
+        let (interstitials, _) = self.library_query.search(&filter).await?;
+
+        if interstitials.is_empty() {
+            return Ok(program_slots);
+        }
+
+        let mut result: Vec<ScheduledSlot> = Vec::new();
+        let mut cursor = program_slots[0].start_at();
+        let mut interstitial_idx = 0;
+
+        for (i, slot) in program_slots.iter().enumerate() {
+            if cursor >= block_end {
+                break;
+            }
+
+            let program_duration = slot.item().duration_secs();
+            let program_end = (cursor + Duration::seconds(program_duration as i64)).min(block_end);
+            result.push(ScheduledSlot::new(
+                cursor,
+                program_end,
+                slot.item().clone(),
+                block_id,
+            ));
+            cursor = program_end;
+
+            let should_insert = i + 1 < program_slots.len()
+                && program_duration >= rule.min_gap_secs()
+                && cursor < block_end;
+
+            if should_insert {
+                let interstitial = &interstitials[interstitial_idx % interstitials.len()];
+                let interstitial_end =
+                    (cursor + Duration::seconds(interstitial.duration_secs() as i64))
+                        .min(block_end);
+                if interstitial_end > cursor {
+                    result.push(ScheduledSlot::new(
+                        cursor,
+                        interstitial_end,
+                        interstitial.clone(),
+                        block_id,
+                    ));
+                    cursor = interstitial_end;
+                    interstitial_idx += 1;
+                }
             }
         }
+
+        Ok(result)
     }
 
     async fn resolve_manual(
@@ -304,7 +377,8 @@ impl ScheduleEngineService {
         window: BlockTimeWindow,
         rotation: RotationContext<'_>,
     ) -> DomainResult<Vec<ScheduledSlot>> {
-        let library_filter = media_filter_to_library_search(params.filter);
+        let library_filter =
+            media_filter_to_library_search(params.filter).with_role(MediaRole::Program);
         let (candidates, _total) = self.library_query.search(&library_filter).await?;
 
         if candidates.is_empty() {