wire mid-roll breaks into schedule engine with chapter-aware splitting

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

@@ -10,7 +10,7 @@ use crate::models::{
 };
 use crate::ports::{ChannelQuery, LibraryQuery, ScheduleCommand, ScheduleQuery};
 use crate::models::MediaItem;
-use crate::value_objects::{BlockId, ChannelId, FillStrategy, InterstitialRule, LibrarySearchFilter, MediaFilter, MediaItemId, MediaRole, RotationPolicy, Weekday};
+use crate::value_objects::{BlockId, ChannelId, FillStrategy, InterstitialRule, LibrarySearchFilter, MediaFilter, MediaItemId, MediaRole, MidRollRule, RotationPolicy, Weekday};
 
 mod fill;
 mod rotation;
@@ -283,11 +283,18 @@ impl ScheduleEngineService {
             }
         };
 
-        if let Some(rule) = block.interstitial_rule() {
+        let with_interstitials = if let Some(rule) = block.interstitial_rule() {
             self.insert_interstitials(program_slots, rule, block.id(), window.end)
+                .await?
+        } else {
+            program_slots
+        };
+
+        if let Some(rule) = block.mid_roll_rule() {
+            self.apply_mid_rolls(with_interstitials, rule, block.id(), window.end)
                 .await
         } else {
-            Ok(program_slots)
+            Ok(with_interstitials)
         }
     }
 
@@ -354,6 +361,132 @@ impl ScheduleEngineService {
         Ok(result)
     }
 
+    async fn apply_mid_rolls(
+        &self,
+        slots: Vec<ScheduledSlot>,
+        rule: &MidRollRule,
+        block_id: BlockId,
+        block_end: DateTime<Utc>,
+    ) -> DomainResult<Vec<ScheduledSlot>> {
+        let interval_secs = rule.fallback_interval_mins() as u64 * 60;
+        if interval_secs == 0 {
+            return Ok(slots);
+        }
+
+        let mut filter = media_filter_to_library_search(rule.pool_filter());
+        filter = filter.with_role(MediaRole::Interstitial);
+        let (break_items, _) = self.library_query.search(&filter).await?;
+
+        if break_items.is_empty() {
+            return Ok(slots);
+        }
+
+        let mut result: Vec<ScheduledSlot> = Vec::new();
+        let mut break_idx = 0usize;
+
+        for slot in &slots {
+            let item_duration = slot.item().duration_secs() as u64;
+
+            if item_duration < interval_secs {
+                result.push(slot.clone());
+                continue;
+            }
+
+            let break_points = Self::compute_break_points(
+                slot.item(),
+                rule.prefer_chapters(),
+                interval_secs,
+            );
+
+            if break_points.is_empty() {
+                result.push(slot.clone());
+                continue;
+            }
+
+            let mut cursor = slot.start_at();
+            let mut prev_offset = 0u64;
+
+            for bp in &break_points {
+                if cursor >= block_end {
+                    break;
+                }
+
+                let segment_duration = bp - prev_offset;
+                let segment_end =
+                    (cursor + Duration::seconds(segment_duration as i64)).min(block_end);
+
+                result.push(ScheduledSlot::new(
+                    cursor,
+                    segment_end,
+                    slot.item().clone(),
+                    block_id,
+                ));
+                cursor = segment_end;
+                prev_offset = *bp;
+
+                if cursor < block_end {
+                    let break_item = &break_items[break_idx % break_items.len()];
+                    let break_end_secs = rule.break_duration_secs().min(break_item.duration_secs());
+                    let break_end =
+                        (cursor + Duration::seconds(break_end_secs as i64)).min(block_end);
+                    if break_end > cursor {
+                        result.push(ScheduledSlot::new(
+                            cursor,
+                            break_end,
+                            break_item.clone(),
+                            block_id,
+                        ));
+                        cursor = break_end;
+                        break_idx += 1;
+                    }
+                }
+            }
+
+            let remaining = item_duration - prev_offset;
+            if remaining > 0 && cursor < block_end {
+                let tail_end =
+                    (cursor + Duration::seconds(remaining as i64)).min(block_end);
+                result.push(ScheduledSlot::new(
+                    cursor,
+                    tail_end,
+                    slot.item().clone(),
+                    block_id,
+                ));
+            }
+        }
+
+        Ok(result)
+    }
+
+    fn compute_break_points(
+        item: &MediaItem,
+        prefer_chapters: bool,
+        interval_secs: u64,
+    ) -> Vec<u64> {
+        if prefer_chapters && !item.chapters().is_empty() {
+            item.chapters()
+                .iter()
+                .filter_map(|ch| {
+                    let end = ch.end_secs() as u64;
+                    if end > 0 && end < item.duration_secs() as u64 {
+                        Some(end)
+                    } else {
+                        None
+                    }
+                })
+                .collect()
+        } else {
+            let duration = item.duration_secs() as u64;
+            let mut points = Vec::new();
+            let mut offset = interval_secs;
+            while offset < duration {
+                points.push(offset);
+                offset += interval_secs;
+            }
+            points
+        }
+    }
+
     async fn resolve_manual(
         &self,
         item_ids: &[MediaItemId],
@@ -458,10 +591,10 @@ impl ScheduleEngineService {
                     boundaries.push((pair[0].end_at(), pair[1].start_at()));
                 }
             }
-            if let Some(last) = slots.last() {
-                if last.end_at() < valid_until {
-                    boundaries.push((last.end_at(), valid_until));
-                }
+            if let Some(last) = slots.last()
+                && last.end_at() < valid_until
+            {
+                boundaries.push((last.end_at(), valid_until));
             }
         }
 
@@ -509,10 +642,8 @@ fn media_filter_to_library_search(filter: &crate::value_objects::MediaFilter) ->
     if let Some(max) = filter.max_duration_secs {
         lsf = lsf.with_max_duration_secs(max);
     }
-    if !filter.collections.is_empty() {
-        if let Some(first) = filter.collections.first() {
-            lsf = lsf.with_collection_id(first.clone());
-        }
+    if let Some(first) = filter.collections.first() {
+        lsf = lsf.with_collection_id(first.clone());
     }
     if !filter.series_names.is_empty() {
         lsf = lsf.with_series_names(filter.series_names.clone());