##############################################################################
# Copyright (c) 2016 Huawei Technologies Co.,Ltd and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################
from __future__ import absolute_import

import inspect
import logging
import socket
from six.moves import filter

from flasgger import Swagger
from flask import Flask
from flask_restful import Api

from api.database import Base
from api.database import db_session
from api.database import engine
from api.database.v1 import models
from api.urls import urlpatterns
from api import ApiResource
from yardstick import _init_logging
from yardstick.common import utils
from yardstick.common import constants as consts

try:
    from urlparse import urljoin
except ImportError:
    from urllib.parse import urljoin

LOG = logging.getLogger(__name__)

app = Flask(__name__)

Swagger(app)

api = Api(app)


@app.teardown_request
def shutdown_session(exception=None):
    db_session.remove()


def get_resource(resource_name):
    name = ''.join(resource_name.split('_'))
    return next((r for r in utils.itersubclasses(ApiResource)
                 if r.__name__.lower() == name))


def init_db():
    def func(a):
        try:
            if issubclass(a[1], Base):
                return True
        except TypeError:
            pass
        return False

    subclses = filter(func, inspect.getmembers(models, inspect.isclass))
    LOG.debug('Import models: %s', [a[1] for a in subclses])
    Base.metadata.create_all(bind=engine)


def app_wrapper(*args, **kwargs):
    init_db()
    return app(*args, **kwargs)


def get_endpoint(url):
    ip = socket.gethostbyname(socket.gethostname())
    return urljoin('http://{}:{}'.format(ip, consts.API_PORT), url)


for u in urlpatterns:
    try:
        api.add_resource(get_resource(u.target), u.url, endpoint=get_endpoint(u.url))
    except StopIteration:
        LOG.error('url resource not found: %s', u.url)


if __name__ == '__main__':
    _init_logging()
    LOG.setLevel(logging.DEBUG)
    LOG.info('Starting server')
    init_db()
    app.run(host='0.0.0.0')