# ABOUTME: Tests for EventAnimalsProjection.
# ABOUTME: Validates event_animals link table updates on animal events.

from animaltrack.events.types import ANIMAL_COHORT_CREATED
from animaltrack.models.events import Event
from animaltrack.projections.event_animals import EventAnimalsProjection


def make_cohort_event(
    event_id: str,
    animal_ids: list[str],
    location_id: str = "01ARZ3NDEKTSV4RRFFQ69G5FAV",
    ts_utc: int = 1704067200000,
) -> Event:
    """Create a test AnimalCohortCreated event."""
    return Event(
        id=event_id,
        type=ANIMAL_COHORT_CREATED,
        ts_utc=ts_utc,
        actor="test_user",
        entity_refs={
            "location_id": location_id,
            "animal_ids": animal_ids,
        },
        payload={
            "species": "duck",
            "count": len(animal_ids),
            "life_stage": "adult",
            "sex": "unknown",
            "location_id": location_id,
            "origin": "purchased",
            "notes": None,
        },
        version=1,
    )


class TestEventAnimalsProjectionEventTypes:
    """Tests for get_event_types method."""

    def test_handles_animal_cohort_created(self, seeded_db):
        """Projection handles AnimalCohortCreated event type."""
        projection = EventAnimalsProjection(seeded_db)
        assert ANIMAL_COHORT_CREATED in projection.get_event_types()


class TestEventAnimalsProjectionApply:
    """Tests for apply()."""

    def test_creates_event_animal_link_for_each_animal(self, seeded_db):
        """Apply creates one row in event_animals per animal_id."""
        row = seeded_db.execute("SELECT id FROM locations WHERE name = 'Strip 1'").fetchone()
        location_id = row[0]

        animal_ids = [
            "01ARZ3NDEKTSV4RRFFQ69G5A01",
            "01ARZ3NDEKTSV4RRFFQ69G5A02",
            "01ARZ3NDEKTSV4RRFFQ69G5A03",
        ]
        event_id = "01ARZ3NDEKTSV4RRFFQ69G5001"

        projection = EventAnimalsProjection(seeded_db)
        event = make_cohort_event(event_id, animal_ids, location_id=location_id)
        projection.apply(event)

        # Check event_animals has 3 rows
        count = seeded_db.execute("SELECT COUNT(*) FROM event_animals").fetchone()[0]
        assert count == 3

        # Check each animal_id is linked
        for animal_id in animal_ids:
            row = seeded_db.execute(
                "SELECT event_id FROM event_animals WHERE animal_id = ?",
                (animal_id,),
            ).fetchone()
            assert row is not None
            assert row[0] == event_id

    def test_event_animal_link_has_correct_event_id(self, seeded_db):
        """Event animal link has correct event_id."""
        row = seeded_db.execute("SELECT id FROM locations WHERE name = 'Strip 1'").fetchone()
        location_id = row[0]

        animal_ids = ["01ARZ3NDEKTSV4RRFFQ69G5A01"]
        event_id = "01ARZ3NDEKTSV4RRFFQ69G5001"

        projection = EventAnimalsProjection(seeded_db)
        event = make_cohort_event(event_id, animal_ids, location_id=location_id)
        projection.apply(event)

        row = seeded_db.execute(
            "SELECT event_id FROM event_animals WHERE animal_id = ?",
            (animal_ids[0],),
        ).fetchone()
        assert row[0] == event_id

    def test_event_animal_link_has_correct_ts_utc(self, seeded_db):
        """Event animal link has correct ts_utc."""
        row = seeded_db.execute("SELECT id FROM locations WHERE name = 'Strip 1'").fetchone()
        location_id = row[0]

        animal_ids = ["01ARZ3NDEKTSV4RRFFQ69G5A01"]
        event_id = "01ARZ3NDEKTSV4RRFFQ69G5001"
        ts_utc = 1704067200000

        projection = EventAnimalsProjection(seeded_db)
        event = make_cohort_event(event_id, animal_ids, location_id=location_id, ts_utc=ts_utc)
        projection.apply(event)

        row = seeded_db.execute(
            "SELECT ts_utc FROM event_animals WHERE animal_id = ?",
            (animal_ids[0],),
        ).fetchone()
        assert row[0] == ts_utc


class TestEventAnimalsProjectionRevert:
    """Tests for revert()."""

    def test_removes_event_animal_links(self, seeded_db):
        """Revert deletes rows from event_animals."""
        row = seeded_db.execute("SELECT id FROM locations WHERE name = 'Strip 1'").fetchone()
        location_id = row[0]

        animal_ids = [
            "01ARZ3NDEKTSV4RRFFQ69G5A01",
            "01ARZ3NDEKTSV4RRFFQ69G5A02",
        ]
        event_id = "01ARZ3NDEKTSV4RRFFQ69G5001"

        projection = EventAnimalsProjection(seeded_db)
        event = make_cohort_event(event_id, animal_ids, location_id=location_id)
        projection.apply(event)

        # Verify rows exist
        count = seeded_db.execute("SELECT COUNT(*) FROM event_animals").fetchone()[0]
        assert count == 2

        # Revert
        projection.revert(event)

        # Verify rows removed
        count = seeded_db.execute("SELECT COUNT(*) FROM event_animals").fetchone()[0]
        assert count == 0

    def test_revert_only_affects_specific_event(self, seeded_db):
        """Revert only removes links for the specific event."""
        row = seeded_db.execute("SELECT id FROM locations WHERE name = 'Strip 1'").fetchone()
        location_id = row[0]

        # Create first event
        animal_ids_1 = ["01ARZ3NDEKTSV4RRFFQ69G5A01"]
        event_id_1 = "01ARZ3NDEKTSV4RRFFQ69G5001"
        projection = EventAnimalsProjection(seeded_db)
        event1 = make_cohort_event(event_id_1, animal_ids_1, location_id=location_id)
        projection.apply(event1)

        # Create second event
        animal_ids_2 = ["01ARZ3NDEKTSV4RRFFQ69G5A02"]
        event_id_2 = "01ARZ3NDEKTSV4RRFFQ69G5002"
        event2 = make_cohort_event(
            event_id_2, animal_ids_2, location_id=location_id, ts_utc=1704067300000
        )
        projection.apply(event2)

        # Verify both exist
        count = seeded_db.execute("SELECT COUNT(*) FROM event_animals").fetchone()[0]
        assert count == 2

        # Revert only event1
        projection.revert(event1)

        # Event2's link should still exist
        count = seeded_db.execute("SELECT COUNT(*) FROM event_animals").fetchone()[0]
        assert count == 1

        row = seeded_db.execute("SELECT event_id FROM event_animals").fetchone()
        assert row[0] == event_id_2