import aioredis.util
import pytest
from _pytest.config import UsageError


def pytest_addoption(parser):
    parser.addoption(
        "--redis", default=None, help="run tests which require redis connection"
    )


def pytest_configure(config):
    config.addinivalue_line(
        "markers", "redis: marked tests require redis connection to run"
    )


def pytest_collection_modifyitems(config, items):
    redis_uri = config.getoption("--redis")
    if redis_uri is None:
        skip_redis = pytest.mark.skip(
            reason="need --redis option with redis URI to run"
        )
        for item in items:
            if "redis" in item.keywords:
                item.add_marker(skip_redis)
        return
    try:
        address, options = aioredis.util.parse_url(redis_uri)
        if not isinstance(address, tuple):
            raise AssertionError(
                "Only redis and rediss schemas are supported, eg redis://foo."
            )
    except AssertionError as e:
        raise UsageError(f"Invalid redis URI {redis_uri!r}: {e}")


@pytest.fixture(scope="session")
def redis_options(request):
    redis_uri = request.config.getoption("--redis")
    (host, port), options = aioredis.util.parse_url(redis_uri)
    options.update({"host": host, "port": port})
    return options