from typing import Optional

import pytest
from quart import Quart, session

from quart_session import Session

@pytest.fixture
def app_factory():
    """Builds a Quart app backed by an in-memory session store."""

    def _factory(**config) -> Quart:
        app = Quart(__name__)
        app.secret_key = "test-secret-key"
        app.config["SESSION_TYPE"] = "null"
        app.config.update(config)
        Session(app)

        # 'null' interface is a no-op store, give it a dict so that
        # open_session() can actually find data again.
        store: dict = {}
        interface = app.session_interface

        async def _get(key: str, app: Optional[Quart] = None):
            return store.get(key)

        async def _set(key: str, value, expiry: Optional[int] = None,
                       app: Optional[Quart] = None):
            store[key] = value

        async def _delete(key: str, app: Optional[Quart] = None):
            store.pop(key, None)

        interface.get = _get
        interface.set = _set
        interface.delete = _delete

        @app.route("/")
        async def index():
            session["hits"] = session.get("hits", 0) + 1
            return {"hits": session["hits"], "sid": session.sid}

        return app

    return _factory