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

import os
import shutil
import tempfile
from unittest import TestCase

import sqlalchemy as sa
from sqlalchemy import orm
from sqlalchemy.engine import Engine
from sqlalchemy.pool import NullPool

from wuttjamaican.db import conf
from wuttjamaican.conf import WuttaConfig


class TestEngineFromConfig(TestCase):

    def test_basic(self):
        engine = conf.engine_from_config({
            'sqlalchemy.url': 'sqlite://',
        })
        self.assertIsInstance(engine, Engine)

    def test_poolclass(self):

        engine = conf.engine_from_config({
            'sqlalchemy.url': 'sqlite://',
        })
        self.assertNotIsInstance(engine.pool, NullPool)

        engine = conf.engine_from_config({
            'sqlalchemy.url': 'sqlite://',
            'sqlalchemy.poolclass': 'sqlalchemy.pool:NullPool',
        })
        self.assertIsInstance(engine.pool, NullPool)

    def test_pool_pre_ping(self):

        engine = conf.engine_from_config({
            'sqlalchemy.url': 'sqlite://',
        })
        self.assertFalse(engine.pool._pre_ping)

        engine = conf.engine_from_config({
            'sqlalchemy.url': 'sqlite://',
            'sqlalchemy.pool_pre_ping': 'true',
        })
        self.assertTrue(engine.pool._pre_ping)


class TestGetEngines(TestCase):

    def setUp(self):
        self.tempdir = tempfile.mkdtemp()

    def tearDown(self):
        shutil.rmtree(self.tempdir)

    def write_file(self, filename, content):
        path = os.path.join(self.tempdir, filename)
        with open(path, 'wt') as f:
            f.write(content)
        return path

    def test_no_default(self):
        myfile = self.write_file('my.conf', '')
        config = WuttaConfig([myfile])
        self.assertEqual(conf.get_engines(config, 'wuttadb'), {})

    def test_default(self):
        myfile = self.write_file('my.conf', """\
[wuttadb]
default.url = sqlite://
""")
        config = WuttaConfig([myfile])
        result = conf.get_engines(config, 'wuttadb')
        self.assertEqual(len(result), 1)
        self.assertIn('default', result)
        engine = result['default']
        self.assertEqual(engine.dialect.name, 'sqlite')

    def test_default_fallback(self):
        myfile = self.write_file('my.conf', """\
[wuttadb]
sqlalchemy.url = sqlite://
""")
        config = WuttaConfig([myfile])
        result = conf.get_engines(config, 'wuttadb')
        self.assertEqual(len(result), 1)
        self.assertIn('default', result)
        engine = result['default']
        self.assertEqual(engine.dialect.name, 'sqlite')

    def test_other(self):
        myfile = self.write_file('my.conf', """\
[otherdb]
keys = first, second
first.url = sqlite://
second.url = sqlite://
""")
        config = WuttaConfig([myfile])
        result = conf.get_engines(config, 'otherdb')
        self.assertEqual(len(result), 2)
        self.assertIn('first', result)
        self.assertIn('second', result)


class TestGetSetting(TestCase):

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

    def tearDown(self):
        self.session.close()

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

    def test_missing_value(self):
        value = conf.get_setting(self.session, 'foo')
        self.assertIsNone(value)