# c3nav settings, mostly taken from the pretix project
import os
import string
import sys
from contextlib import suppress
from pathlib import Path
from typing import Optional

import sass
from django.contrib.messages import constants as messages
from django.core.exceptions import ImproperlyConfigured
from django.utils.crypto import get_random_string
from django.utils.translation import gettext_lazy as _

from c3nav.utils.config import C3navConfigParser
from c3nav.utils.environ import Env


def get_data_dir(setting: str, fallback: Path, create: bool = True, parents: bool = False,
                 config_section: str = 'c3nav', config_option: Optional[str] = None):
    if not config_option:
        config_option = setting.lower()
    subdir = config.get(config_section, config_option, fallback=None, env='C3NAV_' + setting)
    subdir = Path(subdir).resolve() if subdir else fallback
    if not subdir.exists():
        if create:
            subdir.mkdir(parents=parents)
        else:
            raise FileNotFoundError('The %s directory [%s] doesn\'t exist.' % (config_option, subdir))
    elif not subdir.is_dir():
        raise NotADirectoryError('The path set for the %s directory [%s] is not a directory.' % (config_option, subdir))
    return subdir


env = Env()
config = C3navConfigParser(env=env)
if 'C3NAV_CONFIG' in env:
    # if a config file is explicitly defined, make sure we can read it.
    env.path('C3NAV_CONFIG').open('r')
config.read(['/etc/c3nav/c3nav.cfg', os.path.expanduser('~/.c3nav.cfg'), env.str('C3NAV_CONFIG', 'c3nav.cfg')],
            encoding='utf-8')

INSTANCE_NAME = config.get('c3nav', 'name', fallback='', env='C3NAV_INSTANCE_NAME')

SENTRY_DSN = config.get('sentry', 'dsn', fallback=None, env='SENTRY_DSN')

with suppress(ImportError):
    if SENTRY_DSN:
        import sentry_sdk
        from sentry_sdk.integrations.celery import CeleryIntegration
        from sentry_sdk.integrations.django import DjangoIntegration
        from sentry_sdk.scrubber import EventScrubber, DEFAULT_DENYLIST

        sensitive_env_vars = ['C3NAV_DJANGO_SECRET', 'C3NAV_TILE_SECRET', 'C3NAV_DATABASE', 'C3NAV_DATABASE_PASSWORD',
                              'C3NAV_MEMCACHED', 'C3NAV_REDIS', 'C3NAV_CELERY_BROKER', 'C3NAV_CELERY_BACKEND',
                              'C3NAV_EMAIL', 'C3NAV_EMAIL_PASSWORD']
        sensitive_vars = ['SECRET_KEY', 'TILE_SECRET_KEY', 'DATABASES', 'CACHES', 'BROKER_URL', 'CELERY_RESULT_BACKEND']

        denylist = DEFAULT_DENYLIST + sensitive_env_vars + sensitive_vars
        sentry_sdk.init(
            dsn=SENTRY_DSN,
            integrations=[CeleryIntegration(), DjangoIntegration()],
            event_scrubber=EventScrubber(denylist=denylist),
        )

# Build paths inside the project like this: BASE_DIR / 'something'
PROJECT_DIR = Path(__file__).resolve().parent
BASE_DIR = PROJECT_DIR.parent
DATA_DIR = get_data_dir('DATA_DIR', BASE_DIR / 'data', parents=True, config_option='datadir')
LOG_DIR = get_data_dir('LOG_DIR', DATA_DIR / 'logs', config_option='logdir')
MEDIA_ROOT = get_data_dir('MEDIA_ROOT', DATA_DIR / 'media', config_section='django')
STATIC_ROOT = get_data_dir('STATIC_ROOT', PROJECT_DIR / 'static.dist', config_section='django')
SOURCES_ROOT = get_data_dir('SOURCES_ROOT', DATA_DIR / 'sources')
MAP_ROOT = get_data_dir('MAP_ROOT', DATA_DIR / 'map')
RENDER_ROOT = get_data_dir('RENDER_ROOT', DATA_DIR / 'render')
TILES_ROOT = get_data_dir('TILES_ROOT', DATA_DIR / 'tiles')
CACHE_ROOT = get_data_dir('CACHE_ROOT', DATA_DIR / 'cache')
STATS_ROOT = get_data_dir('STATS_ROOT', DATA_DIR / 'stats')

# override the matplotlib default config directory if it's not configured
os.environ.setdefault('MPLCONFIGDIR', str(get_data_dir('MPLCONFIGDIR', CACHE_ROOT / 'matplotlib')))

PUBLIC_EDITOR = config.getboolean('c3nav', 'editor', fallback=True)
PUBLIC_BASE_MAPDATA = config.getboolean('c3nav', 'public_base_mapdata', fallback=False)
AUTO_PROCESS_UPDATES = config.getboolean('c3nav', 'auto_process_updates', fallback=True)

RANDOM_LOCATION_GROUPS = config.get('c3nav', 'random_location_groups', fallback=None)
if RANDOM_LOCATION_GROUPS:
    RANDOM_LOCATION_GROUPS = tuple(int(i) for i in RANDOM_LOCATION_GROUPS.split(','))

SECRET_KEY = config.get('django', 'secret', fallback=None)
if not SECRET_KEY:
    SECRET_FILE = config.get('django', 'secret_file', fallback=None)
    if SECRET_FILE:
        SECRET_FILE = Path(SECRET_FILE)
    else:
        SECRET_FILE = DATA_DIR / '.secret'
    if SECRET_FILE.exists():
        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)

SECRET_TILE_KEY = config.get('c3nav', 'tile_secret', fallback=None)
if not SECRET_TILE_KEY:
    SECRET_TILE_FILE = config.get('c3nav', 'tile_secret_file', fallback=None)
    if SECRET_TILE_FILE:
        SECRET_TILE_FILE = Path(SECRET_TILE_FILE)
    else:
        SECRET_TILE_FILE = DATA_DIR / '.tile_secret'
    if SECRET_TILE_FILE.exists():
        with open(SECRET_TILE_FILE, 'r') as f:
            SECRET_TILE_KEY = f.read().strip()
    else:
        SECRET_TILE_KEY = get_random_string(50, string.printable)
        with open(SECRET_TILE_FILE, 'w') as f:
            os.chmod(SECRET_TILE_FILE, 0o600)
            os.chown(SECRET_TILE_FILE, os.getuid(), os.getgid())
            f.write(SECRET_TILE_KEY)

# Adjustable settings

debug_fallback = "runserver" in sys.argv
DEBUG = config.getboolean('django', 'debug', fallback=debug_fallback, env='C3NAV_DEBUG')

RENDER_SCALE = config.getfloat('c3nav', 'render_scale', fallback=20.0)
IMAGE_RENDERER = config.get('c3nav', 'image_renderer', fallback='svg')
SVG_RENDERER = config.get('c3nav', 'svg_renderer', fallback='rsvg-convert')

CACHE_TILES = config.getboolean('c3nav', 'cache_tiles', fallback=not DEBUG)
CACHE_RESOLUTION = config.getint('c3nav', 'cache_resolution', fallback=4)

IMPRINT_ADDRESS = config.get('c3nav', 'imprint_address', fallback=None)
IMPRINT_PATRONS = config.get('c3nav', 'imprint_patrons', fallback=None)
IMPRINT_TEAM = config.get('c3nav', 'imprint_team', fallback=None)
IMPRINT_HOSTING = config.get('c3nav', 'imprint_hosting', fallback=None)

INITIAL_LEVEL = config.get('c3nav', 'initial_level', fallback=None)
INITIAL_BOUNDS = config.get('c3nav', 'initial_bounds', fallback='').split(' ')

GRID_ROWS = config.get('c3nav', 'grid_rows', fallback=None)
GRID_COLS = config.get('c3nav', 'grid_cols', fallback=None)

if len(INITIAL_BOUNDS) == 4:
    try:
        INITIAL_BOUNDS = tuple(float(i) for i in INITIAL_BOUNDS)
    except ValueError:
        INITIAL_BOUNDS = None
else:
    INITIAL_BOUNDS = None

_db_backend = config.get('database', 'backend', fallback='sqlite3')
DATABASES: dict[str, dict[str, str | int | Path]] = {
    'default': env.db_url('C3NAV_DATABASE') if 'C3NAV_DATABASE' in env else {
        'ENGINE': _db_backend if '.' in _db_backend else 'django.db.backends.' + _db_backend,
    }
}
for key in ('NAME', 'USER', 'PASSWORD', 'HOST', 'PORT'):
    if 'C3NAV_DATABASE' in env:
        # if the C3NAV_DATABASE is present all database options in the config files are ignored
        value = env.str('C3NAV_DATABASE_' + key, default=None)
    else:
        value = config.get('database', key.lower(), fallback=None)
    if value:
        DATABASES['default'][key] = value
    elif key == 'NAME':
        DATABASES['default'].setdefault(key, DATA_DIR / 'db.sqlite3' if _db_backend.endswith('sqlite3')
                                        else (f'c3nav_{INSTANCE_NAME}' if INSTANCE_NAME else 'c3nav'))

DATABASES['default'].setdefault('CONN_MAX_AGE', (0 if _db_backend.endswith('sqlite3') else 120))

DEFAULT_AUTO_FIELD = 'django.db.models.AutoField'

STATIC_URL = config.get('django', 'static_url', fallback='/static/', env='C3NAV_STATIC_URL')
MEDIA_URL = config.get('django', 'media_url', fallback='/media/', env='C3NAV_MEDIA_URL')

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

LANGUAGE_CODE = config.get('locale', 'default', fallback='en', env='C3NAV_DEFAULT_LOCALE')
TIME_ZONE = config.get('locale', 'timezone', fallback='UTC', env='C3NAV_TIMEZONE')

MAIL_FROM = SERVER_EMAIL = DEFAULT_FROM_EMAIL = config.get('email', 'from', fallback='c3nav@localhost')
EMAIL_HOST = config.get('email', 'host', fallback='' if DEBUG else 'localhost')
EMAIL_PORT = config.getint('email', 'port', fallback=25)
EMAIL_HOST_USER = config.get('email', 'user', fallback='')
EMAIL_HOST_PASSWORD = config.get('email', 'password', fallback='')
EMAIL_USE_TLS = config.getboolean('email', 'tls', fallback=False)
EMAIL_USE_SSL = config.getboolean('email', 'ssl', fallback=False)
EMAIL_BACKEND = config.get(
    'email', 'ssl',
    fallback='django.core.mail.backends.' + ('smtp' if EMAIL_HOST else 'console') + '.EmailBackend',
)
if 'C3NAV_EMAIL' in env:
    vars().update(env.email_url('C3NAV_EMAIL'))
EMAIL_SUBJECT_PREFIX = ('[c3nav-%s] ' % INSTANCE_NAME) if INSTANCE_NAME else '[c3nav]'
if config.has_section('mail'):
    raise ImproperlyConfigured('mail config section got renamed to email. Please fix your config file.')

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',
    }
}
HAS_REAL_CACHE = False

SESSION_ENGINE = "django.contrib.sessions.backends.db"

HAS_MEMCACHED = bool(config.get('memcached', 'location', fallback=None, env='C3NAV_MEMCACHED'))
if HAS_MEMCACHED:
    HAS_REAL_CACHE = True
    CACHES['default'] = {
        'BACKEND': 'django.core.cache.backends.memcached.PyLibMCCache',
        'LOCATION': config.get('memcached', 'location', env='C3NAV_MEMCACHED'),
    }
    SESSION_ENGINE = "django.contrib.sessions.backends.cached_db"

HAS_REDIS = bool(config.get('redis', 'location', fallback=None, env='C3NAV_REDIS'))
if HAS_REDIS:
    HAS_REAL_CACHE = True
    CACHES['redis'] = {
        "BACKEND": "django.core.cache.backends.redis.RedisCache",
        "LOCATION": config.get('redis', 'location', env='C3NAV_REDIS'),
    }
    if not HAS_MEMCACHED:
        CACHES['default'] = CACHES['redis']
        SESSION_ENGINE = "django.contrib.sessions.backends.cached_db"
    else:
        SESSION_CACHE_ALIAS = "redis"

HAS_CELERY = config.get('celery', 'broker', fallback=None)
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'

TILE_CACHE_SERVER = config.get('c3nav', 'tile_cache_server', fallback=None)

# Internal settings

SESSION_COOKIE_NAME = 'c3nav_session'
SESSION_COOKIE_DOMAIN = config.get('c3nav', 'session_cookie_domain', fallback=None)
SESSION_COOKIE_HTTPONLY = True
SESSION_COOKIE_SECURE = not DEBUG

LANGUAGE_COOKIE_NAME = 'c3nav_language'

CSRF_COOKIE_NAME = 'c3nav_csrftoken'
CSRF_COOKIE_SECURE = not DEBUG

TILE_ACCESS_COOKIE_NAME = 'c3nav_tile_access'
TILE_ACCESS_COOKIE_DOMAIN = config.get('c3nav', 'tile_access_cookie_domain', fallback=None)
TILE_ACCESS_COOKIE_HTTPONLY = True
TILE_ACCESS_COOKIE_SECURE = not DEBUG


# Application definition

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

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'c3nav.mapdata.middleware.NoLanguageMiddleware',
    'django.middleware.locale.LocaleMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'c3nav.mapdata.middleware.UserDataMiddleware',
    'c3nav.site.middleware.MobileclientMiddleware',
    'c3nav.control.middleware.UserPermissionsMiddleware',
    'c3nav.api.middleware.JsonRequestBodyMiddleware',
]

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',
    ]

with suppress(ImportError):
    import django_extensions  # noqa
    INSTALLED_APPS.append('django_extensions')

# Security settings
X_FRAME_OPTIONS = 'DENY'

# URL settings
ROOT_URLCONF = 'c3nav.urls'

WSGI_APPLICATION = 'c3nav.wsgi.application'
ASGI_APPLICATION = 'c3nav.asgi.application'

if HAS_REDIS:
    CHANNEL_LAYERS = {
        'default': {
            'BACKEND': 'channels_redis.core.RedisChannelLayer',
            'CONFIG': {
                "hosts": config.get('redis', 'location', env='C3NAV_REDIS').split(','),
            },
        },
    }
else:
    CHANNEL_LAYERS = {
        "default": {
            "BACKEND": "channels.layers.InMemoryChannelLayer"
        }
    }

USE_I18N = True
USE_L10N = True
USE_TZ = True

REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': (
        'rest_framework.authentication.SessionAuthentication',
        'c3nav.api.auth.APISecretAuthentication',
    ),
    'DEFAULT_PERMISSION_CLASSES': (
        'rest_framework.permissions.AllowAny',
    )
}

NINJA_PAGINATION_CLASS = "ninja.pagination.LimitOffsetPagination"

LOCALE_PATHS = (
    PROJECT_DIR / 'locale',
)

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

template_loaders = (
    'django.template.loaders.filesystem.Loader',
    'django.template.loaders.app_directories.Loader',
)
if not DEBUG:
    template_loaders = (
        ('django.template.loaders.cached.Loader', template_loaders),
    )
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.contrib.messages.context_processors.messages',
                'c3nav.site.context_processors.logos',
                'c3nav.site.context_processors.colors',
                'c3nav.site.context_processors.user_data_json',
            ],
            'loaders': template_loaders
        },
    },
]


STATICFILES_FINDERS = (
    'django.contrib.staticfiles.finders.FileSystemFinder',
    'django.contrib.staticfiles.finders.AppDirectoriesFinder',
    'compressor.finders.CompressorFinder',
    'c3nav.site.finders.LogoFinder',
)

BOOTSTRAP3 = {
    'success_css_class': '',
}

STATICFILES_DIRS = [
    BASE_DIR / 'c3nav' / 'static',
]

COMPRESS_PRECOMPILERS = (
    ('text/x-scss', 'django_libsass.SassCompiler'),
)

COMPRESS_ENABLED = COMPRESS_OFFLINE = not debug_fallback

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

HEADER_LOGO = config.get('c3nav', 'header_logo', fallback=None)
FAVICON = config.get('c3nav', 'favicon', fallback=None)
FAVICON_PACKAGE = config.get('c3nav', 'favicon_package', fallback=None)

PRIMARY_COLOR = config.get('c3nav', 'primary_color', fallback='')
HEADER_BACKGROUND_COLOR = config.get('c3nav', 'header_background_color', fallback='')
HEADER_TEXT_COLOR = config.get('c3nav', 'header_text_color', fallback='')
HEADER_TEXT_HOVER_COLOR = config.get('c3nav', 'header_text_hover_color', fallback='')
SAFARI_MASK_ICON_COLOR = config.get('c3nav', 'safari_mask_icon_color', fallback=PRIMARY_COLOR)
MSAPPLICATION_TILE_COLOR = config.get('c3nav', 'msapplication_tile_color', fallback='')

WIFI_SSIDS = [n for n in config.get('c3nav', 'wifi_ssids', fallback='').split(',') if n]

USER_REGISTRATION = config.getboolean('c3nav', 'user_registration', fallback=True)


def return_sass_color(color):
    if not color:
        return lambda: color

    if not color.startswith('#') or len(color) != 7 or any((i not in '0123456789abcdef') for i in color[1:]):
        raise ValueError('custom color is not a hex color!')

    return lambda: sass.SassColor(int(color[1:3], 16), int(color[3:5], 16), int(color[5:7], 16), 1)


LIBSASS_CUSTOM_FUNCTIONS = {
    'primary_color': return_sass_color(PRIMARY_COLOR),
    'header_background_color': return_sass_color(HEADER_BACKGROUND_COLOR),
    'header_text_color': return_sass_color(HEADER_TEXT_COLOR),
    'header_text_hover_color': return_sass_color(HEADER_TEXT_HOVER_COLOR),
}

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'

SILENCED_SYSTEM_CHECKS = ['debug_toolbar.W006']

loglevel = env.str('C3NAV_LOGLEVEL', default='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': 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,
        },
        'shapely.geos': {
            'handlers': ['file', 'console'],
            'level': 'INFO',
            'propagate': True,
        },
        'daphne.ws_protocol': {
            'handlers': ['file', 'console'],
            'level': 'INFO',  # Do not output all communication
            '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',
    },
]