from flask import Flask

config_file = os.path.abspath('config.json')

def create_app():

    app = Flask(__name__)

    _default_secret_key = base64.b64encode(os.urandom(32)).decode('utf-8')

    app.config['SECRET_KEY'] = os.environ.get('SECRET_KEY',

                                              _default_secret_key)

    if not hasattr(app.config, 'from_json'):

        def from_json(file, silent=True):

            try:

                with open(file, encoding='utf-8') as json_file:

                    obj = json.load(json_file)

            except IOError:

                if silent:

                    return False

                raise

            for key in obj:

                if key.isupper():

                    app.config[key] = obj[key]

            return True

        app.config.from_json = from_json

    app.config.from_json(config_file, silent=True)

    @app.after_request

    def add_headers(response):

        response.headers.setdefault('Access-Control-Allow-Origin', '*')

        response.headers.setdefault('Cache-Control', 'no-cache')

        return response

    from .views import root_views

    app.register_blueprint(root_views)

    from .state import state_views

    app.register_blueprint(state_views, url_prefix='/state')

    from .sensors import sensors_views

    app.register_blueprint(sensors_views, url_prefix='/sensors')

import copy

import json

import os.path

default_json_file = os.path.abspath('default.json')

last_state_file = os.path.abspath('laststate.json')

default_json = {}

active_json = {}

def reload_json():

    global default_json

    global active_json

    default_json = json.load(open(default_json_file, encoding='utf-8'))

    if os.path.exists(last_state_file):

        with open(last_state_file, encoding='utf-8') as f:

            active_json = json.load(f)

        if os.path.getmtime(last_state_file) \

           < os.path.getmtime(default_json_file):

            backup = copy.deepcopy(active_json)

            active_json.update(default_json)

            active_json['state']['open'] = backup['state']['open']

            active_json['state']['lastchange'] = backup['state']['lastchange']

    else:

        active_json = copy.deepcopy(default_json)

def save_last_state():

    with open(last_state_file, mode='w', encoding='utf-8') as f:

        json.dump(active_json, f, sort_keys=True)