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from __future__ import annotations

from unittest.mock import patch

import pytest
from sqlalchemy.pool import NullPool

from airflow import settings
from airflow.exceptions import AirflowConfigException
from tests.test_utils.config import conf_vars

SQL_ALCHEMY_CONNECT_ARGS = {"test": 43503, "dict": {"is": 1, "supported": "too"}}


class TestSqlAlchemySettings:
    def setup_method(self):
        self.old_engine = settings.engine
        self.old_session = settings.Session
        self.old_conn = settings.SQL_ALCHEMY_CONN
        settings.SQL_ALCHEMY_CONN = "mysql+foobar://user:pass@host/dbname?inline=param&another=param"

    def teardown_method(self):
        settings.engine = self.old_engine
        settings.Session = self.old_session
        settings.SQL_ALCHEMY_CONN = self.old_conn

    @patch("airflow.settings.setup_event_handlers")
    @patch("airflow.settings.scoped_session")
    @patch("airflow.settings.sessionmaker")
    @patch("airflow.settings.create_engine")
    def test_configure_orm_with_default_values(
        self, mock_create_engine, mock_sessionmaker, mock_scoped_session, mock_setup_event_handlers
    ):
        settings.configure_orm()
        mock_create_engine.assert_called_once_with(
            settings.SQL_ALCHEMY_CONN,
            connect_args={},
            encoding="utf-8",
            max_overflow=10,
            pool_pre_ping=True,
            pool_recycle=1800,
            pool_size=5,
            isolation_level="READ COMMITTED",
            future=True,
        )

    @patch("airflow.settings.setup_event_handlers")
    @patch("airflow.settings.scoped_session")
    @patch("airflow.settings.sessionmaker")
    @patch("airflow.settings.create_engine")
    def test_sql_alchemy_connect_args(
        self, mock_create_engine, mock_sessionmaker, mock_scoped_session, mock_setup_event_handlers
    ):
        config = {
            (
                "database",
                "sql_alchemy_connect_args",
            ): "tests.core.test_sqlalchemy_config.SQL_ALCHEMY_CONNECT_ARGS",
            ("database", "sql_alchemy_engine_args"): '{"arg": 1}',
            ("database", "sql_alchemy_pool_enabled"): "False",
        }
        with conf_vars(config):
            settings.configure_orm()
            engine_args = {"arg": 1}
            if settings.SQL_ALCHEMY_CONN.startswith(("mysql", "mssql")):
                engine_args["isolation_level"] = "READ COMMITTED"
            mock_create_engine.assert_called_once_with(
                settings.SQL_ALCHEMY_CONN,
                connect_args=SQL_ALCHEMY_CONNECT_ARGS,
                poolclass=NullPool,
                encoding="utf-8",
                future=True,
                **engine_args,
            )

    @patch("airflow.settings.setup_event_handlers")
    @patch("airflow.settings.scoped_session")
    @patch("airflow.settings.sessionmaker")
    @patch("airflow.settings.create_engine")
    def test_sql_alchemy_invalid_connect_args(
        self, mock_create_engine, mock_sessionmaker, mock_scoped_session, mock_setup_event_handlers
    ):
        config = {
            ("database", "sql_alchemy_connect_args"): "does.not.exist",
            ("database", "sql_alchemy_pool_enabled"): "False",
        }
        with pytest.raises(AirflowConfigException):
            with conf_vars(config):
                settings.configure_orm()
