'''
searx is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

searx is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with searx. If not, see < http://www.gnu.org/licenses/ >.

(C) 2013- by Adam Tauber, <asciimoo@gmail.com>
'''

import logging
from os import environ
from os.path import realpath, dirname, join, abspath, isfile
from io import open
from yaml import safe_load


searx_dir = abspath(dirname(__file__))
engine_dir = dirname(realpath(__file__))
static_path = abspath(join(dirname(__file__), 'static'))


def check_settings_yml(file_name):
    if isfile(file_name):
        return file_name
    else:
        return None


# find location of settings.yml
if 'SEARX_SETTINGS_PATH' in environ:
    # if possible set path to settings using the
    # enviroment variable SEARX_SETTINGS_PATH
    settings_path = check_settings_yml(environ['SEARX_SETTINGS_PATH'])
else:
    # if not, get it from searx code base or last solution from /etc/searx
    settings_path = check_settings_yml(join(searx_dir, 'settings.yml')) or check_settings_yml('/etc/searx/settings.yml')

if not settings_path:
    raise Exception('settings.yml not found')

# load settings
with open(settings_path, 'r', encoding='utf-8') as settings_yaml:
    settings = safe_load(settings_yaml)

if settings['ui']['static_path']:
    static_path = settings['ui']['static_path']

'''
enable debug if
the environnement variable SEARX_DEBUG is 1 or true
(whatever the value in settings.yml)
or general.debug=True in settings.yml

disable debug if
the environnement variable SEARX_DEBUG is 0 or false
(whatever the value in settings.yml)
or general.debug=False in settings.yml
'''
searx_debug_env = environ.get('SEARX_DEBUG', '').lower()
if searx_debug_env == 'true' or searx_debug_env == '1':
    searx_debug = True
elif searx_debug_env == 'false' or searx_debug_env == '0':
    searx_debug = False
else:
    searx_debug = settings.get('general', {}).get('debug')

if searx_debug:
    logging.basicConfig(level=logging.DEBUG)
else:
    logging.basicConfig(level=logging.WARNING)

logger = logging.getLogger('searx')
logger.debug('read configuration from %s', settings_path)
logger.info('Initialisation done')

if 'SEARX_SECRET' in environ:
    settings['server']['secret_key'] = environ['SEARX_SECRET']
if 'SEARX_BIND_ADDRESS' in environ:
    settings['server']['bind_address'] = environ['SEARX_BIND_ADDRESS']
