from pathlib import Path

import pytest
from alembic import command
from alembic.config import Config
from fastapi.testclient import TestClient
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

import app.db as app_db
from app.config import get_settings
from app.main import create_app


def _make_alembic_config(database_url: str) -> Config:
    config = Config("alembic_location.ini")
    config.set_main_option("sqlalchemy.url", database_url)
    return config


def _make_poo_alembic_config(database_url: str) -> Config:
    config = Config("alembic_poo.ini")
    config.set_main_option("sqlalchemy.url", database_url)
    return config


@pytest.fixture
def test_database_urls(tmp_path: Path, monkeypatch: pytest.MonkeyPatch):
    location_database_path = tmp_path / "location_test.db"
    poo_database_path = tmp_path / "poo_placeholder.db"
    location_database_url = f"sqlite:///{location_database_path}"
    poo_database_url = f"sqlite:///{poo_database_path}"

    monkeypatch.setenv("LOCATION_DATABASE_URL", location_database_url)
    monkeypatch.setenv("POO_DATABASE_URL", poo_database_url)
    get_settings.cache_clear()

    try:
        yield {
            "location_path": location_database_path,
            "location_url": location_database_url,
            "poo_path": poo_database_path,
            "poo_url": poo_database_url,
        }
    finally:
        get_settings.cache_clear()


@pytest.fixture
def ready_location_database(test_database_urls):
    command.upgrade(_make_alembic_config(test_database_urls["location_url"]), "head")
    return test_database_urls


@pytest.fixture
def ready_poo_database(test_database_urls):
    command.upgrade(_make_poo_alembic_config(test_database_urls["poo_url"]), "head")
    return test_database_urls


@pytest.fixture
def app(ready_location_database, ready_poo_database):
    yield create_app()


@pytest.fixture
def client(app):
    with TestClient(app) as test_client:
        yield test_client


@pytest.fixture
def location_client(ready_location_database, ready_poo_database, monkeypatch: pytest.MonkeyPatch):
    database_url = ready_location_database["location_url"]

    engine = create_engine(database_url, connect_args={"check_same_thread": False})
    session_local = sessionmaker(bind=engine, autoflush=False, autocommit=False)

    monkeypatch.setattr(app_db, "engine", engine)
    monkeypatch.setattr(app_db, "SessionLocal", session_local)

    fastapi_app = create_app()
    with TestClient(fastapi_app) as client:
        yield client, engine

    engine.dispose()


@pytest.fixture
def poo_client(ready_location_database, ready_poo_database, monkeypatch: pytest.MonkeyPatch):
    database_url = ready_poo_database["poo_url"]

    engine = create_engine(database_url, connect_args={"check_same_thread": False})
    session_local = sessionmaker(bind=engine, autoflush=False, autocommit=False)

    import app.poo_db as poo_db

    monkeypatch.setattr(poo_db, "poo_engine", engine)
    monkeypatch.setattr(poo_db, "PooSessionLocal", session_local)

    fastapi_app = create_app()
    with TestClient(fastapi_app) as client:
        yield client, engine

    engine.dispose()