# -*- coding: utf-8; -*-

import os
import shutil
import tempfile
import warnings
from unittest import TestCase
from unittest.mock import patch, MagicMock

import pytest

from wuttjamaican import app
from wuttjamaican.conf import WuttaConfig


class TestAppHandler(TestCase):

    def setUp(self):
        self.config = WuttaConfig(appname='wuttatest')
        self.app = app.AppHandler(self.config)
        self.config.app = self.app

    def test_init(self):
        self.assertIs(self.app.config, self.config)
        self.assertEqual(self.app.handlers, {})
        self.assertEqual(self.app.appname, 'wuttatest')

    def test_make_appdir(self):

        # appdir is created, and 3 subfolders added by default
        tempdir = tempfile.mkdtemp()
        appdir = os.path.join(tempdir, 'app')
        self.assertFalse(os.path.exists(appdir))
        self.app.make_appdir(appdir)
        self.assertTrue(os.path.exists(appdir))
        self.assertEqual(len(os.listdir(appdir)), 3)
        shutil.rmtree(tempdir)

        # subfolders still added if appdir already exists
        tempdir = tempfile.mkdtemp()
        self.assertTrue(os.path.exists(tempdir))
        self.assertEqual(len(os.listdir(tempdir)), 0)
        self.app.make_appdir(tempdir)
        self.assertEqual(len(os.listdir(tempdir)), 3)
        shutil.rmtree(tempdir)

    def test_make_session(self):
        try:
            from wuttjamaican import db
        except ImportError:
            pytest.skip("test is not relevant without sqlalchemy")

        session = self.app.make_session()
        self.assertIsInstance(session, db.Session.class_)

    def test_short_session(self):
        short_session = MagicMock()
        mockdb = MagicMock(short_session=short_session)

        with patch.dict('sys.modules', **{'wuttjamaican.db': mockdb}):

            with self.app.short_session(foo='bar') as s:
                short_session.assert_called_once_with(
                    foo='bar', factory=self.app.make_session)

    def test_get_setting(self):
        try:
            import sqlalchemy as sa
            from sqlalchemy import orm
        except ImportError:
            pytest.skip("test is not relevant without sqlalchemy")

        Session = orm.sessionmaker()
        engine = sa.create_engine('sqlite://')
        session = Session(bind=engine)
        session.execute(sa.text("""
        create table setting (
                name varchar(255) primary key,
                value text
        );
        """))
        session.commit()

        value = self.app.get_setting(session, 'foo')
        self.assertIsNone(value)

        session.execute(sa.text("insert into setting values ('foo', 'bar');"))
        value = self.app.get_setting(session, 'foo')
        self.assertEqual(value, 'bar')


class TestAppProvider(TestCase):

    def setUp(self):
        self.config = WuttaConfig(appname='wuttatest')
        self.app = app.AppHandler(self.config)
        self.config._app = self.app

    def test_constructor(self):

        # config object is expected
        provider = app.AppProvider(self.config)
        self.assertIs(provider.config, self.config)
        self.assertIs(provider.app, self.app)

        # but can pass app handler instead
        with warnings.catch_warnings():
            warnings.filterwarnings('ignore', category=DeprecationWarning)
            provider = app.AppProvider(self.app)
        self.assertIs(provider.config, self.config)
        self.assertIs(provider.app, self.app)

    def test_get_all_providers(self):

        class FakeProvider(app.AppProvider):
            pass

        # nb. we specify *classes* here
        fake_providers = {'fake': FakeProvider}

        with patch('wuttjamaican.app.load_entry_points') as load_entry_points:
            load_entry_points.return_value = fake_providers

            # sanity check, we get *instances* back from this
            providers = self.app.get_all_providers()
            load_entry_points.assert_called_once_with('wuttatest.providers')
            self.assertEqual(len(providers), 1)
            self.assertIn('fake', providers)
            self.assertIsInstance(providers['fake'], FakeProvider)

    def test_hasattr(self):

        class FakeProvider(app.AppProvider):
            def fake_foo(self):
                pass

        self.app.providers = {'fake': FakeProvider(self.config)}

        self.assertTrue(hasattr(self.app, 'fake_foo'))
        self.assertFalse(hasattr(self.app, 'fake_method_does_not_exist'))

    def test_getattr(self):

        class FakeProvider(app.AppProvider):
            def fake_foo(self):
                return 42

        # nb. using instances here
        fake_providers = {'fake': FakeProvider(self.config)}

        with patch.object(self.app, 'get_all_providers') as get_all_providers:
            get_all_providers.return_value = fake_providers

            self.assertNotIn('providers', self.app.__dict__)
            self.assertIs(self.app.providers, fake_providers)
            get_all_providers.assert_called_once_with()

    def test_getattr_providers(self):

        # collection of providers is loaded on demand
        self.assertNotIn('providers', self.app.__dict__)
        self.assertIsNotNone(self.app.providers)

        # custom attr does not exist yet
        self.assertRaises(AttributeError, getattr, self.app, 'foo_value')

        # but provider can supply the attr
        self.app.providers['mytest'] = MagicMock(foo_value='bar')
        self.assertEqual(self.app.foo_value, 'bar')


class TestGenericHandler(TestCase):

    def setUp(self):
        self.config = WuttaConfig(appname='wuttatest')
        self.app = app.AppHandler(self.config)
        self.config._app = self.app

    def test_constructor(self):
        handler = app.GenericHandler(self.config)
        self.assertIs(handler.config, self.config)
        self.assertIs(handler.app, self.app)