feat(main): main

tests/test_playback_sync.py

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+import pytest
+from django.utils import timezone
+from datetime import timedelta
+from core.models import MediaSource, MediaItem, Channel, ScheduleBlock, ChannelSourceRule, Airing, AppUser, Library
+from api.routers.channel import AiringSchema
+from django.test import Client
+
+@pytest.fixture
+def test_channel(db):
+    user = AppUser.objects.create(username="playback_tester")
+    library = Library.objects.create(name="Test Library", owner_user=user)
+    channel = Channel.objects.create(name="Test Channel", channel_number=10, owner_user=user, library=library)
+    source = MediaSource.objects.create(library=library, name="Test Source", source_type="solid_color")
+    ChannelSourceRule.objects.create(channel=channel, media_source=source, rule_mode='allow', weight=1.0)
+    
+    # Create media item
+    item = MediaItem.objects.create(
+        media_source=source,
+        title="Color Loop",
+        item_kind="solid_color",
+        runtime_seconds=600  # 10 minutes length
+    )
+    
+    return channel, item
+
+import uuid
+
+@pytest.mark.django_db
+def test_playback_offset_calculation(test_channel):
+    channel, item = test_channel
+    now = timezone.now()
+    
+    # Airing started exactly 3 minutes ago
+    starts_at = now - timedelta(minutes=3)
+    ends_at = starts_at + timedelta(minutes=30)
+    
+    airing = Airing.objects.create(
+        channel=channel,
+        media_item=item,
+        starts_at=starts_at,
+        ends_at=ends_at,
+        slot_kind='content',
+        generation_batch_uuid=uuid.uuid4()
+    )
+    
+    schema = AiringSchema.from_airing(airing)
+    
+    # Airing started 3 minutes (180 seconds) ago.
+    # The item runtime is 600s, so offset is simply 180s.
+    assert schema.exact_playback_offset_seconds == pytest.approx(180.0, rel=1e-2)
+
+@pytest.mark.django_db
+def test_playback_offset_modulo(test_channel):
+    channel, item = test_channel
+    now = timezone.now()
+    
+    # Airing started exactly 14 minutes ago
+    starts_at = now - timedelta(minutes=14)
+    ends_at = starts_at + timedelta(minutes=30)
+    
+    airing = Airing.objects.create(
+        channel=channel,
+        media_item=item,
+        starts_at=starts_at,
+        ends_at=ends_at,
+        slot_kind='content',
+        generation_batch_uuid=uuid.uuid4()
+    )
+    
+    schema = AiringSchema.from_airing(airing)
+    
+    # 14 minutes = 840 seconds. 
+    # Video is 600 seconds. 
+    # 840 % 600 = 240 seconds offset into the second loop.
+    assert schema.exact_playback_offset_seconds == pytest.approx(240.0, rel=1e-2)
+
+@pytest.mark.django_db
+def test_channel_now_api_returns_offset(test_channel, client: Client):
+    channel, item = test_channel
+    now = timezone.now()
+    
+    starts_at = now - timedelta(seconds=45)
+    ends_at = starts_at + timedelta(minutes=10)
+    
+    Airing.objects.create(
+        channel=channel,
+        media_item=item,
+        starts_at=starts_at,
+        ends_at=ends_at,
+        slot_kind='content',
+        generation_batch_uuid=uuid.uuid4()
+    )
+    
+    response = client.get(f"/api/channel/{channel.id}/now")
+    assert response.status_code == 200
+    data = response.json()
+    assert "exact_playback_offset_seconds" in data
+    assert data["exact_playback_offset_seconds"] == pytest.approx(45.0, rel=1e-1)