import os

import boto3
import mock
import pytest
from alembic.command import upgrade
from alembic.config import Config
from flask.ext.migrate import Migrate, MigrateCommand
from flask.ext.script import Manager
from sqlalchemy.schema import MetaData

from app import create_app, db


@pytest.fixture(scope='session')
def notify_api(request):
    app = create_app()
    ctx = app.app_context()
    ctx.push()

    def teardown():
        ctx.pop()

    request.addfinalizer(teardown)
    return app


@pytest.fixture(scope='session')
def notify_db(notify_api, request):
    Migrate(notify_api, db)
    Manager(db, MigrateCommand)
    BASE_DIR = os.path.dirname(os.path.dirname(__file__))
    ALEMBIC_CONFIG = os.path.join(BASE_DIR, 'migrations')
    config = Config(ALEMBIC_CONFIG + '/alembic.ini')
    config.set_main_option("script_location", ALEMBIC_CONFIG)

    with notify_api.app_context():
        upgrade(config, 'head')

    def teardown():
        db.session.remove()
        db.engine.execute("drop sequence services_id_seq cascade")
        db.drop_all()
        db.engine.execute("drop table alembic_version")
        db.get_engine(notify_api).dispose()

    request.addfinalizer(teardown)


@pytest.fixture(scope='function')
def notify_db_session(request):
    def teardown():
        db.session.remove()
        for tbl in reversed(meta.sorted_tables):
            db.engine.execute(tbl.delete())
        db.session.commit()

    meta = MetaData(bind=db.engine, reflect=True)
    request.addfinalizer(teardown)


@pytest.fixture(scope='function')
def os_environ(request):
    env_patch = mock.patch('os.environ', {})
    request.addfinalizer(env_patch.stop)

    return env_patch.start()


@pytest.fixture(scope='function')
def sqs_client_conn(request):
    boto3.setup_default_session(region_name='eu-west-1')
    return boto3.resource('sqs')