# Based on https://github.com/netbox-community/netbox-docker/blob/release/configuration/configuration.py
import re
from os import environ
from os.path import abspath, dirname, join


# Read secret from file
def _read_secret(secret_name, default=None):
    try:
        f = open(f"/run/secrets/{secret_name}", encoding="utf-8")
    except OSError:
        return default
    else:
        with f:
            return f.readline().strip()


_BASE_DIR = dirname(dirname(abspath(__file__)))

#########################
#                       #
#   Required settings   #
#                       #
#########################

# This is a list of valid fully-qualified domain names (FQDNs) for the NetBox server. NetBox will not permit write
# access to the server via any other hostnames. The first FQDN in the list will be treated as the preferred name.
#
# Example: ALLOWED_HOSTS = ['netbox.example.com', 'netbox.internal.local']
ALLOWED_HOSTS = environ.get("ALLOWED_HOSTS", "*").split(" ")

# PostgreSQL database configuration. See the Django documentation for a complete list of available parameters:
#   https://docs.djangoproject.com/en/stable/ref/settings/#databases
DATABASE = {
    "NAME": environ.get("DB_NAME", "netbox"),  # Database name
    "USER": environ.get("DB_USER", ""),  # PostgreSQL username
    "PASSWORD": _read_secret("db_password", environ.get("DB_PASSWORD", "")),
    # PostgreSQL password
    "HOST": environ.get("DB_HOST", "localhost"),  # Database server
    "PORT": environ.get("DB_PORT", ""),  # Database port (leave blank for default)
    "OPTIONS": {"sslmode": environ.get("DB_SSLMODE", "prefer")},
    # Database connection SSLMODE
    "CONN_MAX_AGE": int(environ.get("DB_CONN_MAX_AGE", "300")),
    # Max database connection age
    "DISABLE_SERVER_SIDE_CURSORS": environ.get(
        "DB_DISABLE_SERVER_SIDE_CURSORS",
        "False",
    ).lower()
    == "true",
    # Disable the use of server-side cursors transaction pooling
}

# Redis database settings. Redis is used for caching and for queuing background tasks such as webhook events. A separate
# configuration exists for each. Full connection details are required in both sections, and it is strongly recommended
# to use two separate database IDs.
REDIS = {
    "tasks": {
        "HOST": environ.get("REDIS_HOST", "localhost"),
        "PORT": int(environ.get("REDIS_PORT", 6379)),
        "PASSWORD": _read_secret("redis_password", environ.get("REDIS_PASSWORD", "")),
        "DATABASE": int(environ.get("REDIS_DATABASE", 0)),
        "SSL": environ.get("REDIS_SSL", "False").lower() == "true",
        "INSECURE_SKIP_TLS_VERIFY": environ.get(
            "REDIS_INSECURE_SKIP_TLS_VERIFY",
            "False",
        ).lower()
        == "true",
    },
    "caching": {
        "HOST": environ.get("REDIS_CACHE_HOST", environ.get("REDIS_HOST", "localhost")),
        "PORT": int(environ.get("REDIS_CACHE_PORT", environ.get("REDIS_PORT", 6379))),
        "PASSWORD": _read_secret(
            "redis_cache_password",
            environ.get("REDIS_CACHE_PASSWORD", environ.get("REDIS_PASSWORD", "")),
        ),
        "DATABASE": int(environ.get("REDIS_CACHE_DATABASE", 1)),
        "SSL": environ.get("REDIS_CACHE_SSL", environ.get("REDIS_SSL", "False")).lower() == "true",
        "INSECURE_SKIP_TLS_VERIFY": environ.get(
            "REDIS_CACHE_INSECURE_SKIP_TLS_VERIFY",
            environ.get("REDIS_INSECURE_SKIP_TLS_VERIFY", "False"),
        ).lower()
        == "true",
    },
}

# This key is used for secure generation of random numbers and strings. It must never be exposed outside of this file.
# For optimal security, SECRET_KEY should be at least 50 characters in length and contain a mix of letters, numbers, and
# symbols. NetBox will not run without this defined. For more information, see
# https://docs.djangoproject.com/en/stable/ref/settings/#std:setting-SECRET_KEY
SECRET_KEY = _read_secret("secret_key", environ.get("SECRET_KEY", ""))


#########################
#                       #
#   Optional settings   #
#                       #
#########################

# Specify one or more name and email address tuples representing NetBox administrators. These people will be notified of
# application errors (assuming correct email settings are provided).
ADMINS = [
    # ['John Doe', 'jdoe@example.com'],
]

# URL schemes that are allowed within links in NetBox
ALLOWED_URL_SCHEMES = (
    "file",
    "ftp",
    "ftps",
    "http",
    "https",
    "irc",
    "mailto",
    "sftp",
    "ssh",
    "tel",
    "telnet",
    "tftp",
    "vnc",
    "xmpp",
)

# Optionally display a persistent banner at the top and/or bottom of every page. HTML is allowed. To display the same
# content in both banners, define BANNER_TOP and set BANNER_BOTTOM = BANNER_TOP.
BANNER_TOP = environ.get("BANNER_TOP", "")
BANNER_BOTTOM = environ.get("BANNER_BOTTOM", "")

# Text to include on the login page above the login form. HTML is allowed.
BANNER_LOGIN = environ.get("BANNER_LOGIN", "")

# Base URL path if accessing NetBox within a directory. For example, if installed at http://example.com/netbox/, set:
# BASE_PATH = 'netbox/'
BASE_PATH = environ.get("BASE_PATH", "")

# Maximum number of days to retain logged changes. Set to 0 to retain changes indefinitely. (Default: 90)
CHANGELOG_RETENTION = int(environ.get("CHANGELOG_RETENTION", 90))

# API Cross-Origin Resource Sharing (CORS) settings. If CORS_ORIGIN_ALLOW_ALL is set to True, all origins will be
# allowed. Otherwise, define a list of allowed origins using either CORS_ORIGIN_WHITELIST or
# CORS_ORIGIN_REGEX_WHITELIST. For more information, see https://github.com/ottoyiu/django-cors-headers
CORS_ORIGIN_ALLOW_ALL = environ.get("CORS_ORIGIN_ALLOW_ALL", "False").lower() == "true"
CORS_ORIGIN_WHITELIST = list(
    filter(None, environ.get("CORS_ORIGIN_WHITELIST", "https://localhost").split(" ")),
)
CORS_ORIGIN_REGEX_WHITELIST = [
    re.compile(r)
    for r in list(
        filter(None, environ.get("CORS_ORIGIN_REGEX_WHITELIST", "").split(" ")),
    )
]

# Set to True to enable server debugging. WARNING: Debugging introduces a substantial performance penalty and may reveal
# sensitive information about your installation. Only enable debugging while performing testing. Never enable debugging
# on a production system.
DEBUG = environ.get("DEBUG", "False").lower() == "true"

# Set to True to enable DEVELOPER Mode. WARNING: ONLY netbox developers or plugin developers need this access.
DEVELOPER = environ.get("DEVELOPER_MODE", "False").lower() == "true"

# Email settings
EMAIL = {
    "SERVER": environ.get("EMAIL_SERVER", "localhost"),
    "PORT": int(environ.get("EMAIL_PORT", 25)),
    "USERNAME": environ.get("EMAIL_USERNAME", ""),
    "PASSWORD": _read_secret("email_password", environ.get("EMAIL_PASSWORD", "")),
    "USE_SSL": environ.get("EMAIL_USE_SSL", "False").lower() == "true",
    "USE_TLS": environ.get("EMAIL_USE_TLS", "False").lower() == "true",
    "SSL_CERTFILE": environ.get("EMAIL_SSL_CERTFILE", ""),
    "SSL_KEYFILE": environ.get("EMAIL_SSL_KEYFILE", ""),
    "TIMEOUT": int(environ.get("EMAIL_TIMEOUT", 10)),  # seconds
    "FROM_EMAIL": environ.get("EMAIL_FROM", ""),
}

# Enforcement of unique IP space can be toggled on a per-VRF basis. To enforce unique IP space within the global table
# (all prefixes and IP addresses not assigned to a VRF), set ENFORCE_GLOBAL_UNIQUE to True.
ENFORCE_GLOBAL_UNIQUE = environ.get("ENFORCE_GLOBAL_UNIQUE", "False").lower() == "true"

# Exempt certain models from the enforcement of view permissions. Models listed here will be viewable by all users and
# by anonymous users. List models in the form `<app>.<model>`. Add '*' to this list to exempt all models.
EXEMPT_VIEW_PERMISSIONS = list(
    filter(None, environ.get("EXEMPT_VIEW_PERMISSIONS", "").split(" ")),
)

# Enable GraphQL API.
GRAPHQL_ENABLED = environ.get("GRAPHQL_ENABLED", "True").lower() == "true"

# Enable custom logging. Please see the Django documentation for detailed guidance on configuring custom logs:
#   https://docs.djangoproject.com/en/stable/topics/logging/
LOGGING = {}

# Setting this to True will permit only authenticated users to access any part of NetBox. By default, anonymous users
# are permitted to access most data in NetBox (excluding secrets) but not make any changes.
LOGIN_REQUIRED = environ.get("LOGIN_REQUIRED", "False").lower() == "true"

# The length of time (in seconds) for which a user will remain logged into the web UI before being prompted to
# re-authenticate. (Default: 1209600 [14 days])
LOGIN_TIMEOUT = int(environ.get("LOGIN_TIMEOUT", 1209600))

# Setting this to True will display a "maintenance mode" banner at the top of every page.
MAINTENANCE_MODE = environ.get("MAINTENANCE_MODE", "False").lower() == "true"

# An API consumer can request an arbitrary number of objects =by appending the "limit" parameter to the URL (e.g.
# "?limit=1000"). This setting defines the maximum limit. Setting it to 0 or None will allow an API consumer to request
# all objects by specifying "?limit=0".
MAX_PAGE_SIZE = int(environ.get("MAX_PAGE_SIZE", 1000))

# The file path where uploaded media such as image attachments are stored. A trailing slash is not needed. Note that
# the default value of this setting is derived from the installed location.
MEDIA_ROOT = environ.get("MEDIA_ROOT", join(_BASE_DIR, "media"))

# Expose Prometheus monitoring metrics at the HTTP endpoint '/metrics'
METRICS_ENABLED = environ.get("METRICS_ENABLED", "False").lower() == "true"

# Credentials that NetBox will uses to authenticate to devices when connecting via NAPALM.
NAPALM_USERNAME = environ.get("NAPALM_USERNAME", "")
NAPALM_PASSWORD = _read_secret("napalm_password", environ.get("NAPALM_PASSWORD", ""))

# NAPALM timeout (in seconds). (Default: 30)
NAPALM_TIMEOUT = int(environ.get("NAPALM_TIMEOUT", 30))

# NAPALM optional arguments (see http://napalm.readthedocs.io/en/latest/support/#optional-arguments). Arguments must
# be provided as a dictionary.
NAPALM_ARGS = {}

# Determine how many objects to display per page within a list. (Default: 50)
PAGINATE_COUNT = int(environ.get("PAGINATE_COUNT", 50))

# Enable installed plugins. Add the name of each plugin to the list.
PLUGINS = []

# Plugins configuration settings. These settings are used by various plugins that the user may have installed.
# Each key in the dictionary is the name of an installed plugin and its value is a dictionary of settings.
PLUGINS_CONFIG = {}

# When determining the primary IP address for a device, IPv6 is preferred over IPv4 by default. Set this to True to
# prefer IPv4 instead.
PREFER_IPV4 = environ.get("PREFER_IPV4", "False").lower() == "true"

# Rack elevation size defaults, in pixels. For best results, the ratio of width to height should be roughly 10:1.
RACK_ELEVATION_DEFAULT_UNIT_HEIGHT = int(
    environ.get("RACK_ELEVATION_DEFAULT_UNIT_HEIGHT", 22),
)
RACK_ELEVATION_DEFAULT_UNIT_WIDTH = int(
    environ.get("RACK_ELEVATION_DEFAULT_UNIT_WIDTH", 220),
)

# Remote authentication support
REMOTE_AUTH_ENABLED = environ.get("REMOTE_AUTH_ENABLED", "False").lower() == "true"
REMOTE_AUTH_BACKEND = environ.get(
    "REMOTE_AUTH_BACKEND",
    "netbox.authentication.RemoteUserBackend",
)
REMOTE_AUTH_HEADER = environ.get("REMOTE_AUTH_HEADER", "HTTP_REMOTE_USER")
REMOTE_AUTH_AUTO_CREATE_USER = environ.get("REMOTE_AUTH_AUTO_CREATE_USER", "True").lower() == "true"
REMOTE_AUTH_DEFAULT_GROUPS = list(
    filter(None, environ.get("REMOTE_AUTH_DEFAULT_GROUPS", "").split(" ")),
)

# This repository is used to check whether there is a new release of NetBox available. Set to None to disable the
# version check or use the URL below to check for release in the official NetBox repository.
# https://api.github.com/repos/netbox-community/netbox/releases
RELEASE_CHECK_URL = environ.get("RELEASE_CHECK_URL", None)

# The file path where custom reports will be stored. A trailing slash is not needed. Note that the default value of
# this setting is derived from the installed location.
REPORTS_ROOT = environ.get("REPORTS_ROOT", "/etc/netbox/reports")

# Maximum execution time for background tasks, in seconds.
RQ_DEFAULT_TIMEOUT = int(environ.get("RQ_DEFAULT_TIMEOUT", 300))

# The file path where custom scripts will be stored. A trailing slash is not needed. Note that the default value of
# this setting is derived from the installed location.
SCRIPTS_ROOT = environ.get("SCRIPTS_ROOT", "/etc/netbox/scripts")

# By default, NetBox will store session data in the database. Alternatively, a file path can be specified here to use
# local file storage instead. (This can be useful for enabling authentication on a standby instance with read-only
# database access.) Note that the user as which NetBox runs must have read and write permissions to this path.
SESSION_FILE_PATH = environ.get("SESSIONS_ROOT", None)

# Time zone (default: UTC)
TIME_ZONE = environ.get("TIME_ZONE", "UTC")

# Date/time formatting. See the following link for supported formats:
# https://docs.djangoproject.com/en/stable/ref/templates/builtins/#date
DATE_FORMAT = environ.get("DATE_FORMAT", "N j, Y")
SHORT_DATE_FORMAT = environ.get("SHORT_DATE_FORMAT", "Y-m-d")
TIME_FORMAT = environ.get("TIME_FORMAT", "g:i a")
SHORT_TIME_FORMAT = environ.get("SHORT_TIME_FORMAT", "H:i:s")
DATETIME_FORMAT = environ.get("DATETIME_FORMAT", "N j, Y g:i a")
SHORT_DATETIME_FORMAT = environ.get("SHORT_DATETIME_FORMAT", "Y-m-d H:i")