"""
Django settings for config project.
"""
from pathlib import Path
import os


BASE_DIR = Path(__file__).resolve().parent.parent



def env_list(key, default=''):
    value = os.environ.get(key, default)
    return [v.strip() for v in value.split(',')] if value else []

SECRET_KEY = os.environ.get('SECRET_KEY')
DEBUG = os.environ.get('DEBUG', 'False') == 'True'
ALLOWED_HOSTS = env_list('ALLOWED_HOSTS')

# Application definition
INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'core',
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'whitenoise.middleware.WhiteNoiseMiddleware',
    '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',
]

ROOT_URLCONF = 'config.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [BASE_DIR / 'templates'],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
            'libraries': {
                'survey_tags': 'core.templatetags.survey_tags',
            },
        },
    },
]

WSGI_APPLICATION = 'config.wsgi.application'

# Database
DATABASES = {
    'default': {
        'ENGINE': os.environ.get('DB_ENGINE', 'django.db.backends.sqlite3'),
        'NAME': os.environ.get('DB_NAME', str(BASE_DIR / 'db.sqlite3')),
        'USER': os.environ.get('DB_USER', ''),
        'PASSWORD': os.environ.get('DB_PASSWORD', ''),
        'HOST': os.environ.get('DB_HOST', ''),
        'PORT': os.environ.get('DB_PORT', ''),
    }
}


AUTHENTICATION_BACKENDS = [
    'core.backends.EmailOrUsernameBackend',
    'django.contrib.auth.backends.ModelBackend',
]

LOGIN_URL = '/login/'
LOGIN_REDIRECT_URL = '/'
LOGOUT_REDIRECT_URL = '/login/'

# Superadmin credentials are parked in env for future bootstrap; not consumed yet.
SUPERADMIN_USERNAME = os.environ.get('SUPERADMIN_USERNAME', '')
SUPERADMIN_EMAIL = os.environ.get('SUPERADMIN_EMAIL', '')
SUPERADMIN_PASSWORD = os.environ.get('SUPERADMIN_PASSWORD', '')


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'},
]

# Internationalization
LANGUAGE_CODE = os.environ.get('LANGUAGE_CODE', 'en-us')
TIME_ZONE = os.environ.get('TIME_ZONE', 'UTC')
USE_I18N = True
USE_TZ = True

# Static files
STATIC_URL = os.environ.get('STATIC_URL', '/static/')
STATICFILES_DIRS = [BASE_DIR / 'static']
STATIC_ROOT = BASE_DIR / os.environ.get('STATIC_ROOT', 'staticfiles')

# Media files
MEDIA_URL = os.environ.get('MEDIA_URL', '/media/')
MEDIA_ROOT = BASE_DIR / os.environ.get('MEDIA_ROOT', 'media')

STORAGES = {
    'default': {
        'BACKEND': 'django.core.files.storage.FileSystemStorage',
    },
    'staticfiles': {
        'BACKEND': 'whitenoise.storage.CompressedManifestStaticFilesStorage'
        if not DEBUG
        else 'django.contrib.staticfiles.storage.StaticFilesStorage',
    },
}

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

# Production security settings
if not DEBUG:
    SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')
    SECURE_SSL_REDIRECT = os.environ.get('SECURE_SSL_REDIRECT', 'True') == 'True'
    SESSION_COOKIE_SECURE = True
    CSRF_COOKIE_SECURE = True
    SECURE_HSTS_SECONDS = int(os.environ.get('SECURE_HSTS_SECONDS', '31536000'))
    SECURE_HSTS_INCLUDE_SUBDOMAINS = True
    SECURE_HSTS_PRELOAD = True
    SECURE_CONTENT_TYPE_NOSNIFF = True
    X_FRAME_OPTIONS = 'DENY'