# c3nav settings, mostly taken from the pretix project
import configparser
import os
import string
import sys
from contextlib import suppress

from django.contrib.messages import constants as messages
from django.utils.crypto import get_random_string
from django.utils.translation import ugettext_lazy as _

config = configparser.RawConfigParser()
config.read(['/etc/c3nav/c3nav.cfg', os.path.expanduser('~/.c3nav.cfg'), os.environ.get('C3NAV_CONFIG', 'c3nav.cfg')],
            encoding='utf-8')

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(__file__))
DATA_DIR = config.get('c3nav', 'datadir', fallback=os.environ.get('DATA_DIR', 'data'))
LOG_DIR = os.path.join(DATA_DIR, 'logs')
MEDIA_ROOT = os.path.join(DATA_DIR, 'media')
MAP_ROOT = os.path.join(DATA_DIR, 'map')
RENDER_ROOT = os.path.join(DATA_DIR, 'render')

if not os.path.exists(DATA_DIR):
    os.mkdir(DATA_DIR)
if not os.path.exists(LOG_DIR):
    os.mkdir(LOG_DIR)
if not os.path.exists(MEDIA_ROOT):
    os.mkdir(MEDIA_ROOT)
if not os.path.exists(MAP_ROOT):
    os.mkdir(MAP_ROOT)
if not os.path.exists(RENDER_ROOT):
    os.mkdir(RENDER_ROOT)

if config.has_option('django', 'secret'):
    SECRET_KEY = config.get('django', 'secret')
else:
    SECRET_FILE = os.path.join(DATA_DIR, '.secret')
    if os.path.exists(SECRET_FILE):
        with open(SECRET_FILE, 'r') as f:
            SECRET_KEY = f.read().strip()
    else:
        SECRET_KEY = get_random_string(50, string.printable)
        with open(SECRET_FILE, 'w') as f:
            os.chmod(SECRET_FILE, 0o600)
            os.chown(SECRET_FILE, os.getuid(), os.getgid())
            f.write(SECRET_KEY)

# Adjustable settings

debug_fallback = "runserver" in sys.argv
DEBUG = config.getboolean('django', 'debug', fallback=debug_fallback)
RENDER_SCALE = float(config.get('c3nav', 'render_scale', fallback=20.0))

db_backend = config.get('database', 'backend', fallback='sqlite3')
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.' + db_backend,
        'NAME': config.get('database', 'name', fallback=os.path.join(DATA_DIR, 'db.sqlite3')),
        'USER': config.get('database', 'user', fallback=''),
        'PASSWORD': config.get('database', 'password', fallback=''),
        'HOST': config.get('database', 'host', fallback=''),
        'PORT': config.get('database', 'port', fallback=''),
        'CONN_MAX_AGE': 0 if db_backend == 'sqlite3' else 120
    }
}

STATIC_URL = config.get('urls', 'static', fallback='/static/')

ALLOWED_HOSTS = [n for n in config.get('django', 'hosts', fallback='').split(',') if n]

LANGUAGE_CODE = config.get('locale', 'default', fallback='en')
TIME_ZONE = config.get('locale', 'timezone', fallback='UTC')

MAIL_FROM = SERVER_EMAIL = DEFAULT_FROM_EMAIL = config.get('mail', 'from', fallback='c3nav@localhost')
EMAIL_HOST = config.get('mail', 'host', fallback='localhost')
EMAIL_PORT = config.getint('mail', 'port', fallback=25)
EMAIL_HOST_USER = config.get('mail', 'user', fallback='')
EMAIL_HOST_PASSWORD = config.get('mail', 'password', fallback='')
EMAIL_USE_TLS = config.getboolean('mail', 'tls', fallback=False)
EMAIL_USE_SSL = config.getboolean('mail', 'ssl', fallback=False)
EMAIL_SUBJECT_PREFIX = '[c3nav] '

ADMINS = [('Admin', n) for n in config.get('mail', 'admins', fallback='').split(",") if n]

CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
        'LOCATION': 'unique-snowflake',
    }
}
REAL_CACHE_USED = False
SESSION_ENGINE = "django.contrib.sessions.backends.db"

HAS_MEMCACHED = config.has_option('memcached', 'location')
if HAS_MEMCACHED:
    REAL_CACHE_USED = True
    CACHES['default'] = {
        'BACKEND': 'django.core.cache.backends.memcached.PyLibMCCache',
        'LOCATION': config.get('memcached', 'location'),
    }
    SESSION_ENGINE = "django.contrib.sessions.backends.cached_db"

HAS_CELERY = config.has_option('celery', 'broker')
if HAS_CELERY:
    BROKER_URL = config.get('celery', 'broker')
    CELERY_RESULT_BACKEND = config.get('celery', 'backend')
    CELERY_SEND_TASK_ERROR_EMAILS = bool(ADMINS)
else:
    CELERY_ALWAYS_EAGER = True
CELERY_TASK_SERIALIZER = 'json'
CELERY_ACCEPT_CONTENT = ['json']
CELERY_RESULT_SERIALIZER = 'json'

SESSION_COOKIE_DOMAIN = config.get('c3nav', 'cookie_domain', fallback=None)
SESSION_COOKIE_SECURE = config.getboolean('c3nav', 'session_cookie_secure', fallback=False)

# Internal settings
STATIC_ROOT = os.path.join(os.path.dirname(__file__), 'static.dist')

SESSION_COOKIE_NAME = 'c3nav_session'
LANGUAGE_COOKIE_NAME = 'c3nav_language'
CSRF_COOKIE_NAME = 'c3nav_csrftoken'
SESSION_COOKIE_HTTPONLY = True

# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'compressor',
    'bootstrap3',
    'c3nav.api',
    'rest_framework',
    'c3nav.mapdata',
    'c3nav.routing',
    'c3nav.site',
    'c3nav.editor',
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.locale.LocaleMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

with suppress(ImportError):
    import debug_toolbar  # noqa
    INSTALLED_APPS.append('debug_toolbar')
    MIDDLEWARE.append('debug_toolbar.middleware.DebugToolbarMiddleware')

with suppress(ImportError):
    import htmlmin  # noqa
    MIDDLEWARE += [
        'htmlmin.middleware.HtmlMinifyMiddleware',
        'htmlmin.middleware.MarkRequestMiddleware',
    ]

# Security settings
X_FRAME_OPTIONS = 'DENY'

# URL settings
ROOT_URLCONF = 'c3nav.urls'

WSGI_APPLICATION = 'c3nav.wsgi.application'

USE_I18N = True
USE_L10N = True
USE_TZ = True

REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': (
        'rest_framework.authentication.SessionAuthentication',
    ),
    'DEFAULT_PERMISSION_CLASSES': (
        'rest_framework.permissions.AllowAny',
    )
}

LOCALE_PATHS = (
    os.path.join(os.path.dirname(__file__), 'locale'),
)

LANGUAGES = [
    ('en', _('English')),
    ('de', _('German')),
]

template_loaders = (
    'django.template.loaders.filesystem.Loader',
    'django.template.loaders.app_directories.Loader',
)
TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'OPTIONS': {
            'context_processors': [
                'django.contrib.auth.context_processors.auth',
                'django.template.context_processors.debug',
                'django.template.context_processors.i18n',
                'django.template.context_processors.request',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
            'loaders': template_loaders
        },
    },
]
if not DEBUG:
    template_loaders = (
        ('django.template.loaders.cached.Loader', template_loaders),
    )


STATICFILES_FINDERS = (
    'django.contrib.staticfiles.finders.FileSystemFinder',
    'django.contrib.staticfiles.finders.AppDirectoriesFinder',
    'compressor.finders.CompressorFinder',
)

BOOTSTRAP3 = {
    'success_css_class': '',
}

STATICFILES_DIRS = (
    os.path.join(BASE_DIR, 'static'),
)

COMPRESS_ENABLED = COMPRESS_OFFLINE = not debug_fallback

COMPRESS_CSS_FILTERS = (
    'compressor.filters.css_default.CssAbsoluteFilter',
    'compressor.filters.cssmin.CSSCompressorFilter',
)

INTERNAL_IPS = ('127.0.0.1', '::1')

MESSAGE_TAGS = {
    messages.INFO: 'alert-info',
    messages.ERROR: 'alert-danger',
    messages.WARNING: 'alert-warning',
    messages.SUCCESS: 'alert-success',
}
MESSAGE_STORAGE = 'django.contrib.messages.storage.session.SessionStorage'

loglevel = 'DEBUG' if DEBUG else 'INFO'

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'default': {
            'format': '%(levelname)s %(asctime)s %(name)s %(module)s %(message)s'
        },
    },
    'handlers': {
        'console': {
            'level': loglevel,
            'class': 'logging.StreamHandler',
            'formatter': 'default'
        },
        'file': {
            'level': loglevel,
            'class': 'logging.FileHandler',
            'filename': os.path.join(LOG_DIR, 'c3nav.log'),
            'formatter': 'default'
        }
    },
    'loggers': {
        '': {
            'handlers': ['file', 'console'],
            'level': loglevel,
            'propagate': True,
        },
        'django.request': {
            'handlers': ['file', 'console'],
            'level': loglevel,
            'propagate': True,
        },
        'django.security': {
            'handlers': ['file', 'console'],
            'level': loglevel,
            'propagate': True,
        },
        'django.db.backends': {
            'handlers': ['file', 'console'],
            'level': 'INFO',  # Do not output all the queries
            'propagate': True,
        }
    },
}

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]