import asyncio
import os
from typing import Generator

import pytest
from tortoise import Tortoise, expand_db_url
from tortoise.backends.asyncpg.schema_generator import AsyncpgSchemaGenerator
from tortoise.backends.mysql.schema_generator import MySQLSchemaGenerator
from tortoise.backends.sqlite.schema_generator import SqliteSchemaGenerator
from tortoise.contrib.test import MEMORY_SQLITE

from aerich.ddl.mysql import MysqlDDL
from aerich.ddl.postgres import PostgresDDL
from aerich.ddl.sqlite import SqliteDDL
from aerich.migrate import Migrate
from tests._utils import init_db

db_url = os.getenv("TEST_DB", MEMORY_SQLITE)
db_url_second = os.getenv("TEST_DB_SECOND", MEMORY_SQLITE)
tortoise_orm = {
    "connections": {
        "default": expand_db_url(db_url, testing=True),
        "second": expand_db_url(db_url_second, testing=True),
    },
    "apps": {
        "models": {"models": ["tests.models", "aerich.models"], "default_connection": "default"},
        "models_second": {"models": ["tests.models_second"], "default_connection": "second"},
    },
}


@pytest.fixture(scope="function", autouse=True)
def reset_migrate() -> None:
    Migrate.upgrade_operators = []
    Migrate.downgrade_operators = []
    Migrate._upgrade_fk_m2m_index_operators = []
    Migrate._downgrade_fk_m2m_index_operators = []
    Migrate._upgrade_m2m = []
    Migrate._downgrade_m2m = []


@pytest.fixture(scope="session")
def event_loop() -> Generator:
    policy = asyncio.get_event_loop_policy()
    res = policy.new_event_loop()
    asyncio.set_event_loop(res)
    res._close = res.close  # type:ignore[attr-defined]
    res.close = lambda: None  # type:ignore[method-assign]

    yield res

    res._close()  # type:ignore[attr-defined]


@pytest.fixture(scope="session", autouse=True)
async def initialize_tests(event_loop, request) -> None:
    await init_db(tortoise_orm)
    client = Tortoise.get_connection("default")
    if client.schema_generator is MySQLSchemaGenerator:
        Migrate.ddl = MysqlDDL(client)
    elif client.schema_generator is SqliteSchemaGenerator:
        Migrate.ddl = SqliteDDL(client)
    elif client.schema_generator is AsyncpgSchemaGenerator:
        Migrate.ddl = PostgresDDL(client)
    Migrate.dialect = Migrate.ddl.DIALECT
    request.addfinalizer(lambda: event_loop.run_until_complete(Tortoise._drop_databases()))