"""Regression tests for B-30: a periodic sweep must catch a deposit whose
scripthash notification was silently lost, independent of whatever the
notification-driven path (electrum/listener.py:refresh_user) is doing."""

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

from app.db.base import Base
from app.db.models import User
from app.deposits.reconcile import DepositReconciler


@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 _seed_users(session_factory, addresses: list[str]) -> list[int]:
    async with session_factory() as session:
        ids = []
        for i, address in enumerate(addresses):
            user = User(username=f"user{i}", password_hash="x", derivation_index=i, address=address)
            session.add(user)
            await session.flush()
            ids.append(user.id)
        await session.commit()
        return ids


# Real, decodable PLM bech32 addresses (address_to_scripthash actually parses
# them) — arbitrary otherwise.
_ADDRESSES = [
    "plm1q0xcqpzrky6eff2g52qdye53xkk9jxkvraxkkwd",
    "plm1q5x25wd6q463mfhckjraaedgjg0lyu73qfcj43n",
    "plm1qqph9qup2mp7w7g5nlsdhdc9m2pp44ampzw0ctx",
]


class FakeListener:
    def __init__(self, *, fail_for: set[int] | None = None, disconnect_after: int | None = None):
        self.client = object()  # truthy: "connected"
        self.refreshed: list[int] = []
        self._fail_for = fail_for or set()
        self._disconnect_after = disconnect_after

    async def refresh_user(self, user_id: int, scripthash: str) -> None:
        self.refreshed.append(user_id)
        if self._disconnect_after is not None and len(self.refreshed) >= self._disconnect_after:
            self.client = None
        if user_id in self._fail_for:
            raise RuntimeError(f"listunspent failed for user {user_id}")


async def test_sweep_once_refreshes_every_user(session_factory):
    user_ids = await _seed_users(session_factory, _ADDRESSES)
    listener = FakeListener()
    reconciler = DepositReconciler(session_factory, listener)

    await reconciler._sweep_once()

    assert listener.refreshed == user_ids


async def test_sweep_once_continues_past_a_failing_user(session_factory):
    """One user's refresh failing (a transient network hiccup) must not stop the
    sweep from reaching the rest — mirrors poll_once's per-item isolation."""
    user_ids = await _seed_users(session_factory, _ADDRESSES)
    listener = FakeListener(fail_for={user_ids[1]})
    reconciler = DepositReconciler(session_factory, listener)

    await reconciler._sweep_once()

    assert listener.refreshed == user_ids


async def test_sweep_once_stops_when_the_connection_drops_mid_sweep(session_factory):
    """No point continuing once the connection is gone — the next reconnect's own
    _subscribe_all_users will cover everyone anyway."""
    user_ids = await _seed_users(session_factory, _ADDRESSES)
    listener = FakeListener(disconnect_after=1)
    reconciler = DepositReconciler(session_factory, listener)

    await reconciler._sweep_once()

    assert listener.refreshed == user_ids[:1]


async def test_sweep_once_does_nothing_with_no_users(session_factory):
    listener = FakeListener()
    reconciler = DepositReconciler(session_factory, listener)

    await reconciler._sweep_once()  # must not raise

    assert listener.refreshed == []