"""
Functionality:
- read and write config
- load config variables into redis
- needs to be a separate module to avoid circular import
"""

import json
import os

from home.src.helper import get_message, set_message


class AppConfig:
    """ handle user settings and application variables """

    def __init__(self):
        self.config = self.get_config()

    def get_config(self):
        """ get config from default file or redis if changed """
        config = self.get_config_redis()
        if not config:
            config = self.get_config_file()

        config['application'].update(self.get_config_env())
        return config

    def get_config_file(self):
        """ read the defaults from config.json """
        with open('home/config.json', 'r', encoding="utf-8") as f:
            config_str = f.read()
            config_file = json.loads(config_str)

        config_file['application'].update(self.get_config_env())

        return config_file

    @staticmethod
    def get_config_env():
        """ read environment application variables """
        application = {
            'REDIS_HOST': os.environ.get('REDIS_HOST'),
            'es_url': os.environ.get('ES_URL'),
            'HOST_UID': int(os.environ.get('HOST_UID')),
            'HOST_GID': int(os.environ.get('HOST_GID'))
        }

        return application

    @staticmethod
    def get_config_redis():
        """ read config json set from redis to overwrite defaults """
        config = get_message('config')
        if not list(config.values())[0]:
            return False

        return config

    def update_config(self, form_post):
        """ update config values from settings form """
        config = self.config
        for key, value in form_post.items():
            to_write = value[0]
            if len(to_write):
                if to_write == '0':
                    to_write = False
                elif to_write == '1':
                    to_write = True
                elif to_write.isdigit():
                    to_write = int(to_write)

                config_dict, config_value = key.split('.')
                config[config_dict][config_value] = to_write

        set_message('config', config, expire=False)

    def load_new_defaults(self):
        """ check config.json for missing defaults """
        default_config = self.get_config_file()
        redis_config = self.get_config_redis()

        # check for customizations
        if not redis_config:
            return

        needs_update = False

        for key, value in default_config.items():
            # missing whole main key
            if key not in redis_config:
                redis_config.update({key: value})
                needs_update = True
                continue

            # missing nested values
            for sub_key, sub_value in value.items():
                if sub_key not in redis_config[key].keys():
                    redis_config[key].update({sub_key: sub_value})
                    needs_update = True

        if needs_update:
            set_message('config', redis_config, expire=False)