"""
Django settings for the Deis project.
"""

import os.path
import tempfile

# A boolean that turns on/off debug mode.
# https://docs.djangoproject.com/en/1.9/ref/settings/#debug
DEBUG = False

# If set to True, Django's normal exception handling of view functions
# will be suppressed, and exceptions will propagate upwards
# https://docs.djangoproject.com/en/1.9/ref/settings/#debug-propagate-exceptions
DEBUG_PROPAGATE_EXCEPTIONS = False

# Silence two security messages around SSL as router takes care of them
# https://docs.djangoproject.com/en/1.9/ref/checks/#security
SILENCED_SYSTEM_CHECKS = [
    'security.W004',
    'security.W008'
]

CONN_MAX_AGE = 60 * 3

# SECURITY: change this to allowed fqdn's to prevent host poisioning attacks
# https://docs.djangoproject.com/en/1.6/ref/settings/#allowed-hosts
ALLOWED_HOSTS = ['*']

# Local time zone for this installation. Choices can be found here:
# http://en.wikipedia.org/wiki/List_of_tz_zones_by_name
# although not all choices may be available on all operating systems.
# In a Windows environment this must be set to your system time zone.
TIME_ZONE = 'UTC'

# Language code for this installation. All choices can be found here:
# http://www.i18nguy.com/unicode/language-identifiers.html
LANGUAGE_CODE = 'en-us'

# If you set this to False, Django will make some optimizations so as not
# to load the internationalization machinery.
# https://docs.djangoproject.com/en/1.9/ref/settings/#use-i18n
USE_I18N = False

# If you set this to False, Django will not format dates, numbers and
# calendars according to the current locale.
USE_L10N = True

# If you set this to False, Django will not use timezone-aware datetimes.
USE_TZ = True

# Manage templates
TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [
            # insert your TEMPLATE_DIRS here
        ],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                "django.contrib.auth.context_processors.auth",
                "django.template.context_processors.debug",
                "django.template.context_processors.i18n",
                "django.template.context_processors.media",
                "django.template.context_processors.request",
                "django.template.context_processors.tz",
                "django.contrib.messages.context_processors.messages"
            ],
        },
    },
]

MIDDLEWARE_CLASSES = (
    'corsheaders.middleware.CorsMiddleware',
    'django.middleware.security.SecurityMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'api.middleware.APIVersionMiddleware',
    'deis.middleware.PlatformVersionMiddleware',
)

ROOT_URLCONF = 'deis.urls'

# Python dotted path to the WSGI application used by Django's runserver.
WSGI_APPLICATION = 'deis.wsgi.application'

INSTALLED_APPS = (
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.humanize',
    'django.contrib.messages',
    'django.contrib.sessions',
    # Third-party apps
    'corsheaders',
    'guardian',
    'gunicorn',
    'jsonfield',
    'rest_framework',
    'rest_framework.authtoken',
    # Deis apps
    'api'
)

AUTHENTICATION_BACKENDS = (
    "django.contrib.auth.backends.ModelBackend",
    "guardian.backends.ObjectPermissionBackend",
)

ANONYMOUS_USER_ID = -1
LOGIN_URL = '/v2/auth/login/'
LOGIN_REDIRECT_URL = '/'

# Security settings
CORS_ORIGIN_ALLOW_ALL = True
CORS_ALLOW_HEADERS = (
    'content-type',
    'accept',
    'origin',
    'Authorization',
    'Host',
)

CORS_EXPOSE_HEADERS = (
    'DEIS_API_VERSION',
    'DEIS_PLATFORM_VERSION',
)

X_FRAME_OPTIONS = 'DENY'
CSRF_COOKIE_SECURE = True
CSRF_COOKIE_HTTPONLY = True
SESSION_COOKIE_SECURE = True
SECURE_CONTENT_TYPE_NOSNIFF = True
SECURE_BROWSER_XSS_FILTER = True

# Honor HTTPS from a trusted proxy
# see https://docs.djangoproject.com/en/1.6/ref/settings/#secure-proxy-ssl-header
SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')

# standard datetime format used for logging, model timestamps, etc.
DEIS_DATETIME_FORMAT = '%Y-%m-%dT%H:%M:%SZ'

REST_FRAMEWORK = {
    'DATETIME_FORMAT': DEIS_DATETIME_FORMAT,
    'DEFAULT_MODEL_SERIALIZER_CLASS': 'rest_framework.serializers.ModelSerializer',
    'DEFAULT_PERMISSION_CLASSES': (
        'rest_framework.permissions.IsAuthenticated',
    ),
    'DEFAULT_AUTHENTICATION_CLASSES': (
        'rest_framework.authentication.TokenAuthentication',
    ),
    'DEFAULT_RENDERER_CLASSES': (
        'rest_framework.renderers.JSONRenderer',
    ),
    'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.LimitOffsetPagination',
    'PAGE_SIZE': 100,
    'TEST_REQUEST_DEFAULT_FORMAT': 'json',
}

# URLs that end with slashes are ugly
APPEND_SLASH = False

# Determine where to send syslog messages
if os.path.exists('/dev/log'):           # Linux rsyslog
    SYSLOG_ADDRESS = '/dev/log'
elif os.path.exists('/var/log/syslog'):  # Mac OS X syslog
    SYSLOG_ADDRESS = '/var/log/syslog'
else:                                    # default SysLogHandler address
    SYSLOG_ADDRESS = ('localhost', 514)

# A sample logging configuration. The only tangible logging
# performed by this configuration is to send an email to
# the site admins on every HTTP 500 error when DEBUG=False.
# See http://docs.djangoproject.com/en/dev/topics/logging for
# more details on how to customize your logging configuration.
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'verbose': {
            'format': '%(levelname)s %(asctime)s %(module)s %(process)d %(thread)d %(message)s'
        },
        'simple': {
            'format': '%(levelname)s %(message)s'
        },
    },
    'filters': {
        'require_debug_false': {
            '()': 'django.utils.log.RequireDebugFalse'
        }
    },
    'handlers': {
        'null': {
            'level': 'DEBUG',
            'class': 'logging.NullHandler',
        },
        'console': {
            'level': 'DEBUG',
            'class': 'logging.StreamHandler',
            'formatter': 'simple'
        },
        'mail_admins': {
            'level': 'ERROR',
            'filters': ['require_debug_false'],
            'class': 'django.utils.log.AdminEmailHandler'
        },
        'rsyslog': {
            'class': 'logging.handlers.SysLogHandler',
            'address': SYSLOG_ADDRESS,
            'facility': 'local0',
        },
    },
    'loggers': {
        'django': {
            'handlers': ['null'],
            'level': 'INFO',
            'propagate': True,
        },
        'django.request': {
            'handlers': ['console', 'mail_admins'],
            'level': 'WARNING',
            'propagate': True,
        },
        'api': {
            'handlers': ['console', 'mail_admins', 'rsyslog'],
            'level': 'INFO',
            'propagate': True,
        },
        'registry': {
            'handlers': ['console', 'mail_admins', 'rsyslog'],
            'level': 'INFO',
            'propagate': True,
        },
        'scheduler': {
            'handlers': ['console', 'mail_admins', 'rsyslog'],
            'level': 'DEBUG',
            'propagate': True,
        },
    }
}
TEST_RUNNER = 'api.tests.SilentDjangoTestSuiteRunner'

# default deis settings
LOG_LINES = 100
TEMPDIR = tempfile.mkdtemp(prefix='deis')

# names which apps cannot reserve for routing
DEIS_RESERVED_NAMES = os.environ.get('RESERVED_NAMES', '').replace(' ', '').split(',')

# default scheduler settings
SCHEDULER_MODULE = 'scheduler'
SCHEDULER_URL = "https://{}:{}".format(
    # accessing the k8s api server by IP address rather than hostname avoids
    # intermittent DNS errors
    os.environ.get('KUBERNETES_SERVICE_HOST', 'kubernetes.default.svc.cluster.local'),
    os.environ.get('KUBERNETES_SERVICE_PORT', '443')
)

# security keys and auth tokens
random_secret = 'CHANGEME_sapm$s%upvsw5l_zuy_&29rkywd^78ff(qi*#@&*^'
SECRET_KEY = os.environ.get('DEIS_SECRET_KEY', random_secret)
BUILDER_KEY = os.environ.get('DEIS_BUILDER_KEY', random_secret)

# k8s image policies
SLUGRUNNER_IMAGE = os.environ.get('SLUGRUNNER_IMAGE_NAME', 'quay.io/deisci/slugrunner:canary')  # noqa
SLUG_BUILDER_IMAGE_PULL_POLICY = os.environ.get('SLUG_BUILDER_IMAGE_PULL_POLICY', "Always")  # noqa
DOCKER_BUILDER_IMAGE_PULL_POLICY = os.environ.get('DOCKER_BUILDER_IMAGE_PULL_POLICY', "Always")  # noqa

# Define a global default on how many pods to bring up and then
# take down sequentially during a deploy
# Defaults to None, the default is to deploy to as many nodes as
# the application has been instructed to run on
# Can also be overwritten on per app basis if desired
DEIS_DEPLOY_BATCHES = os.environ.get('DEIS_DEPLOY_BATCHES', None)

# How long k8s waits for a pod to finish work after a SIGTERM before sending SIGKILL
KUBERNETES_POD_TERMINATION_GRACE_PERIOD_SECONDS = int(os.environ.get('KUBERNETES_POD_TERMINATION_GRACE_PERIOD_SECONDS', 30))  # noqa

# registry settings
REGISTRY_HOST = os.environ.get('DEIS_REGISTRY_SERVICE_HOST', '127.0.0.1')
REGISTRY_PORT = os.environ.get('DEIS_REGISTRY_SERVICE_PORT', 5000)
REGISTRY_URL = '{}:{}'.format(REGISTRY_HOST, REGISTRY_PORT)

# logger settings
LOGGER_HOST = os.environ.get('DEIS_LOGGER_SERVICE_HOST', '127.0.0.1')
LOGGER_PORT = os.environ.get('DEIS_LOGGER_SERVICE_PORT_HTTP', 80)

# router information
ROUTER_HOST = os.environ.get('DEIS_ROUTER_SERVICE_HOST', '127.0.0.1')
ROUTER_PORT = os.environ.get('DEIS_ROUTER_SERVICE_PORT', 80)

# check if we can register users with `deis register`
REGISTRATION_MODE = os.environ.get('REGISTRATION_MODE', 'enabled')

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': os.environ.get('DEIS_DATABASE_NAME', os.environ.get('DEIS_DATABASE_USER', 'deis')),
        'USER': os.environ.get('DEIS_DATABASE_USER', ''),
        'PASSWORD': os.environ.get('DEIS_DATABASE_PASSWORD', ''),
        'HOST': os.environ.get('DEIS_DATABASE_SERVICE_HOST', ''),
        'PORT': os.environ.get('DEIS_DATABASE_SERVICE_PORT', 5432),
        # https://docs.djangoproject.com/en/1.9/ref/databases/#persistent-connections
        'CONN_MAX_AGE': 600,
    }
}

APP_URL_REGEX = '[a-z0-9-]+'