import io
from contextlib import redirect_stdout
from datetime import datetime
from pathlib import Path

import pytest
import yaml
from psycopg2 import IntegrityError
from sqlalchemy.exc import ProgrammingError

from ereuse_devicehub.client import Client, UserClient
from ereuse_devicehub.config import DevicehubConfig
from ereuse_devicehub.db import db
from ereuse_devicehub.devicehub import Devicehub
from ereuse_devicehub.resources.agent.models import Person
from ereuse_devicehub.resources.tag import Tag
from ereuse_devicehub.resources.user.models import User

STARTT = datetime(year=2000, month=1, day=1, hour=1)
"""A dummy starting time to use in tests."""
ENDT = datetime(year=2000, month=1, day=1, hour=2)
"""A dummy ending time to use in tests."""
T = {'start_time': STARTT, 'end_time': ENDT}
"""A dummy start_time/end_time to use as function keywords."""


class TestConfig(DevicehubConfig):
    SQLALCHEMY_DATABASE_URI = 'postgresql://dhub:ereuse@localhost/dh_test'
    SCHEMA = 'test'
    TESTING = True
    ORGANIZATION_NAME = 'FooOrg'
    ORGANIZATION_TAX_ID = 'foo-org-id'
    SERVER_NAME = 'localhost'


@pytest.fixture(scope='session')
def config():
    return TestConfig()


@pytest.fixture(scope='session')
def _app(config: TestConfig) -> Devicehub:
    return Devicehub(config=config, db=db)


@pytest.fixture()
def app(request, _app: Devicehub) -> Devicehub:
    # More robust than 'yield'
    def _drop(*args, **kwargs):
        with _app.app_context():
            db.drop_all()

    with _app.app_context():
        try:
            with redirect_stdout(io.StringIO()):
                _app.init_db()
        except (ProgrammingError, IntegrityError):
            print('Database was not correctly emptied. Re-empty and re-installing...')
            _drop()
            _app.init_db()

    request.addfinalizer(_drop)
    return _app


@pytest.fixture()
def client(app: Devicehub) -> Client:
    return app.test_client()


@pytest.fixture()
def app_context(app: Devicehub):
    with app.app_context():
        yield


@pytest.fixture()
def user(app: Devicehub) -> UserClient:
    """Gets a client with a logged-in dummy user."""
    with app.app_context():
        password = 'foo'
        user = create_user(password=password)
        client = UserClient(app, user.email, password, response_wrapper=app.response_class)
        client.login()
        return client


def create_user(email='foo@foo.com', password='foo') -> User:
    user = User(email=email, password=password)
    user.individuals.add(Person(name='Timmy'))
    db.session.add(user)
    db.session.commit()
    return user


@pytest.fixture()
def auth_app_context(app: Devicehub):
    """Creates an app context with a set user."""
    with app.app_context():
        user = create_user()

        class Auth:  # Mock
            username = user.token
            password = ''

        app.auth.perform_auth(Auth())
        yield app


def file(name: str) -> dict:
    """Opens and parses a YAML file from the ``files`` subdir."""
    with Path(__file__).parent.joinpath('files').joinpath(name + '.yaml').open() as f:
        return yaml.load(f)


@pytest.fixture()
def tag_id(app: Devicehub) -> str:
    """Creates a tag and returns its id."""
    with app.app_context():
        t = Tag(id='foo')
        db.session.add(t)
        db.session.commit()
        return t.id