from datetime import datetime, timedelta, timezone

import pytest
from sqlalchemy import select
from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine

from app.db.base import Base
from app.db.models import Round, RoundConfig
from app.rounds.scheduler import RoundScheduler


class FakeListener:
    client = object()  # truthy sentinel; _tick only checks "is not None"
    tip_height = 100
    tip_header_hex = "00"


@pytest.fixture
async def session_factory():
    engine = create_async_engine("sqlite+aiosqlite:///:memory:")
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    yield async_sessionmaker(engine, expire_on_commit=False)
    await engine.dispose()


async def test_tick_survives_sqlite_naive_datetime_roundtrip(session_factory, monkeypatch):
    """Regression test: SQLite drops tzinfo on round-trip, so opened_at comes back
    naive even though it was written as an aware UTC datetime. A prior bug compared
    it directly against datetime.now(timezone.utc) and crashed with
    "can't compare offset-naive and offset-aware datetimes" on every tick once a
    round existed — this must not happen."""
    async with session_factory() as session:
        session.add(RoundConfig(fee_address="", round_duration_seconds=3600))  # not due yet
        session.add(Round(status="open", opened_at=datetime.now(timezone.utc)))
        await session.commit()

    scheduler = RoundScheduler(session_factory, FakeListener())
    await scheduler._tick()  # must not raise


async def test_tick_closes_round_with_no_participants_once_due(session_factory, monkeypatch):
    past = datetime.now(timezone.utc) - timedelta(seconds=10)
    async with session_factory() as session:
        session.add(RoundConfig(fee_address="", round_duration_seconds=1))
        session.add(Round(status="open", opened_at=past))
        await session.commit()

    scheduler = RoundScheduler(session_factory, FakeListener())
    await scheduler._tick()

    async with session_factory() as session:
        round_ = (await session.scalars(select(Round))).one()
        assert round_.status == "closed"