import pytest
from _pytest.runner import runtestprotocol


@pytest.hookimpl(tryfirst=True)
def pytest_collection_modifyitems(config, items):
    parallel_items = []
    serial_items = []

    for item in items:
        if "serial" in item.keywords:
            serial_items.append(item)
        else:
            parallel_items.append(item)

    # Modify the collection to run serial tests first
    config.serial_items = serial_items
    items[:] = parallel_items


@pytest.hookimpl(tryfirst=True)
def pytest_sessionfinish(session, exitstatus):
    config = session.config
    if hasattr(config, "serial_items") and config.serial_items:
        serial_items = config.serial_items

        # Run serial tests one by one
        for item in serial_items:
            runtestprotocol(item, nextitem=None)