from unittest.mock import AsyncMock

import pytest

from ingestor.connection.certs import CertProvider


@pytest.mark.asyncio
async def test_fetch_returns_local_paths(tmp_path):
    mongo = AsyncMock()
    mongo.find_one.return_value = {
        'client_cert': {'minio_object_name': 'platform/certificates/client_cert_c.pem'},
        'private_key': {'minio_object_name': 'platform/certificates/private_key_k.pem'},
    }
    minio = AsyncMock()
    minio.download_file.side_effect = [b'cert-bytes', b'key-bytes']

    provider = CertProvider(mongo, minio, cache_dir=str(tmp_path), bucket='sientia-dataops')
    cert, key = await provider.fetch()

    assert cert.endswith('c.pem') and key.endswith('k.pem')
    assert minio.download_file.await_count == 2
    mongo.find_one.assert_awaited_once_with('platform_certificates', {}, {})
    minio.download_file.assert_any_await(
        'platform/certificates/client_cert_c.pem', 'sientia-dataops', {}
    )
    assert (tmp_path / 'client_cert_c.pem').read_bytes() == b'cert-bytes'
    assert (tmp_path / 'private_key_k.pem').read_bytes() == b'key-bytes'


@pytest.mark.asyncio
async def test_lazy_minio_builds_client_once_on_first_download():
    from unittest.mock import MagicMock

    from ingestor.connection.certs import LazyMinio

    client = AsyncMock()
    client.download_file.return_value = b'bytes'
    factory = MagicMock(return_value=client)
    minio = LazyMinio(factory)

    factory.assert_not_called()  # no network at construction
    assert await minio.download_file('a.pem', 'bucket', {}) == b'bytes'
    await minio.download_file('b.pem', 'bucket', {})

    factory.assert_called_once()
    assert client.download_file.await_count == 2


def test_build_cert_provider_is_lazy_and_uses_config(monkeypatch):
    from unittest.mock import MagicMock

    from ingestor.config import GatewayConfig
    from ingestor.connection import certs

    minio_cls = MagicMock()
    monkeypatch.setattr(certs, 'MinioRepository', minio_cls)
    mongo = MagicMock()

    provider = certs.build_cert_provider(
        mongo=mongo,
        config=GatewayConfig(cert_bucket='streamlit-connectors', cert_cache_dir='certs-cache'),
        logger=MagicMock(),
        notification_handler=MagicMock(),
        metrics_controller=MagicMock(),
    )

    assert provider.mongo is mongo
    assert provider.bucket == 'streamlit-connectors'
    assert provider.cache_dir == 'certs-cache'
    assert isinstance(provider.minio, certs.LazyMinio)
    minio_cls.assert_not_called()  # MinIO is only reached when a cert is needed


def _provider(tmp_path, doc=None, data=b'pem'):
    from unittest.mock import MagicMock

    mongo = MagicMock()
    mongo.find_one = AsyncMock(
        return_value=doc
        if doc is not None
        else {
            'client_cert': {'minio_object_name': 'platform_certificates/c.pem'},
            'private_key': {'minio_object_name': 'platform_certificates/k.pem'},
        }
    )
    minio = MagicMock()
    minio.download_file = AsyncMock(return_value=data)
    return CertProvider(mongo=mongo, minio=minio, cache_dir=str(tmp_path), bucket='b'), minio


@pytest.mark.asyncio
@pytest.mark.parametrize(
    'doc',
    [
        None,
        {},
        {'client_cert': {'minio_object_name': 'c.pem'}},
        {'client_cert': None, 'private_key': {}},
    ],
)
async def test_fetch_without_platform_certificate_raises_clear_error(tmp_path, doc):
    from ingestor.connection.certs import CertificateNotConfiguredError

    provider, minio = _provider(tmp_path)
    provider.mongo.find_one.return_value = doc

    with pytest.raises(CertificateNotConfiguredError, match='platform_certificates'):
        await provider.fetch()
    minio.download_file.assert_not_awaited()


@pytest.mark.asyncio
async def test_fetch_is_cached_until_invalidated(tmp_path):
    provider, minio = _provider(tmp_path)

    first = await provider.fetch()
    second = await provider.fetch()
    assert first == second
    assert minio.download_file.await_count == 2  # cert + key, once

    provider.invalidate()
    await provider.fetch()
    assert minio.download_file.await_count == 4


@pytest.mark.asyncio
async def test_concurrent_fetches_download_once(tmp_path):
    import asyncio

    provider, minio = _provider(tmp_path)

    results = await asyncio.gather(*(provider.fetch() for _ in range(5)))

    assert len(set(results)) == 1
    assert minio.download_file.await_count == 2


@pytest.mark.asyncio
async def test_download_replaces_file_atomically(tmp_path):
    provider, minio = _provider(tmp_path, data=b'new')
    (tmp_path / 'c.pem').write_bytes(b'old')

    cert_path, _ = await provider.fetch()

    assert (tmp_path / 'c.pem').read_bytes() == b'new'
    assert cert_path == str(tmp_path / 'c.pem')
    assert not list(tmp_path.glob('*.tmp'))