from collections.abc import AsyncGenerator
from unittest.mock import AsyncMock, MagicMock

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

from streamstack.core.db import Base


@pytest.fixture(scope="function")
async def db_engine():
    engine = create_async_engine("sqlite+aiosqlite:///:memory:")
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    yield engine
    await engine.dispose()


@pytest.fixture(scope="function")
async def db_session(db_engine) -> AsyncGenerator[AsyncSession, None]:
    session_factory = async_sessionmaker(db_engine, expire_on_commit=False)
    async with session_factory() as session:
        yield session


@pytest.fixture
def mock_nats():
    nc = AsyncMock()
    js = AsyncMock()
    kv = AsyncMock()
    nc.jetstream.return_value = js
    js.key_value.return_value = kv
    js.create_key_value.return_value = kv
    js.find_key_value.return_value = kv
    return nc


@pytest.fixture
def mock_s3_client():
    client = MagicMock()
    client.head_object.return_value = {
        "ContentLength": 1024 * 1024,
        "ContentType": "video/mp4",
    }
    return client


@pytest.fixture
def s3_content() -> bytes:
    return b"fake video content " * 1000