"""
Django settings for holy_backend project.

Generated by 'django-admin startproject' using Django 6.0.2.

For more information on this file, see
https://docs.djangoproject.com/en/6.0/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/6.0/ref/settings/
"""
from pathlib import Path
import os


# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/6.0/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = os.environ.get('SECRET_KEY', 'django-insecure-zos99ue2a89!4jrv4g@_b4nn4z!5o*@8k!5cr9!u$j%_@xb=l8')

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = os.environ.get('DEBUG', 'false').lower() == 'true'

# Simplification: Use a single DOMAIN variable to derive multiple settings
DOMAIN = os.environ.get('DOMAIN', 'holy.narl.io')

# Helper to build lists from env or defaults
def get_env_list(var_name, default_list):
    val = os.environ.get(var_name)
    if val:
        return [item.strip() for item in val.split(',')]
    return default_list

ALLOWED_HOSTS = get_env_list('ALLOWED_HOSTS', ['localhost', '127.0.0.1', 'backend', 'worker', DOMAIN])


# Application definition

INSTALLED_APPS = [
    'whitenoise.runserver_nostatic',
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    # Third party
    'rest_framework',
    'rest_framework.authtoken',
    'corsheaders',
    'django_filters',
    'drf_spectacular',
    'django_ratelimit',
    # Local
    'api',
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'whitenoise.middleware.WhiteNoiseMiddleware',
    'compression_middleware.middleware.CompressionMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'corsheaders.middleware.CorsMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'holy_backend.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'holy_backend.wsgi.application'


# Database
# https://docs.djangoproject.com/en/6.0/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': BASE_DIR / 'db.sqlite3',
    }
}

# Cache configuration for Ratelimiting
CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.db.DatabaseCache',
        'LOCATION': 'django_ratelimit_cache',
    }
}

# Silence ratelimit warnings for non-Redis/Memcached backends
SILENCED_SYSTEM_CHECKS = ['django_ratelimit.W001', 'django_ratelimit.E003']


# Password validation
# https://docs.djangoproject.com/en/6.0/ref/settings/#auth-password-validators

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
# https://docs.djangoproject.com/en/6.0/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/6.0/howto/static-files/

STATIC_URL = 'static/'
STATIC_ROOT = BASE_DIR / 'staticfiles'
STATICFILES_STORAGE = 'whitenoise.storage.CompressedStaticFilesStorage'
WHITENOISE_INDEX_PAGE = True

MEDIA_URL = 'media/'
MEDIA_ROOT = BASE_DIR / 'media'

# --- Reverse Proxy Configuration ---
# These settings are crucial for running behind a proxy like Traefik
USE_X_FORWARDED_HOST = True
USE_X_FORWARDED_PORT = True
SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')

# Production Security
if not DEBUG:
    SECURE_SSL_REDIRECT = True
    SESSION_COOKIE_SECURE = True
    CSRF_COOKIE_SECURE = True
    SECURE_BROWSER_XSS_FILTER = True
    SECURE_CONTENT_TYPE_NOSNIFF = True
    SECURE_HSTS_SECONDS = 31536000  # 1 year
    SECURE_HSTS_INCLUDE_SUBDOMAINS = True
    SECURE_HSTS_PRELOAD = True

# Read CSRF trusted origins from environment variable
CSRF_TRUSTED_ORIGINS = get_env_list('CSRF_TRUSTED_ORIGINS', [f'https://{DOMAIN}', 'http://localhost:5173'])

# Custom User Model
AUTH_USER_MODEL = 'api.User'

# REST Framework
REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': [
        'rest_framework.authentication.TokenAuthentication',
        'rest_framework.authentication.SessionAuthentication',
    ],
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework.permissions.IsAuthenticatedOrReadOnly',
    ],
    'DEFAULT_FILTER_BACKENDS': ['django_filters.rest_framework.DjangoFilterBackend'],
    'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination',
    'PAGE_SIZE': 50,
    'DEFAULT_SCHEMA_CLASS': 'drf_spectacular.openapi.AutoSchema',
}

# CORS
CORS_ALLOWED_ORIGINS = get_env_list('CORS_ALLOWED_ORIGINS', [f'https://{DOMAIN}', 'http://localhost:5173', 'http://127.0.0.1:5173'])

FRONTEND_URL = os.environ.get('FRONTEND_URL', f'https://{DOMAIN}').rstrip('/')

import os
# ... (near top of file)

# Email (SMTP)
# For production, set these via environment variables.
# For development, it will default to printing emails to the console.
EMAIL_HOST = os.environ.get('EMAIL_HOST')
EMAIL_PORT = int(os.environ.get('EMAIL_PORT', 587))
# Default to False unless explicitly set to 'true' in the .env file
EMAIL_USE_TLS = os.environ.get('EMAIL_USE_TLS', 'false').lower() == 'true'
EMAIL_USE_SSL = os.environ.get('EMAIL_USE_SSL', 'false').lower() == 'true'
EMAIL_HOST_USER = os.environ.get('EMAIL_HOST_USER')
EMAIL_HOST_PASSWORD = os.environ.get('EMAIL_HOST_PASSWORD')
EMAIL_SKIP_CERT_VERIFICATION = os.environ.get('EMAIL_SKIP_CERT_VERIFICATION', 'false').lower() == 'true'
DEFAULT_FROM_EMAIL = os.environ.get('DEFAULT_FROM_EMAIL', EMAIL_HOST_USER)
SERVER_EMAIL = DEFAULT_FROM_EMAIL

if EMAIL_HOST:
    EMAIL_BACKEND = 'api.email_backend.InsecureEmailBackend'
else:
    EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'

# Swagger
SPECTACULAR_SETTINGS = {
    'TITLE': 'Holy Flavors API',
    'DESCRIPTION': 'API for rating flavors',
    'VERSION': '1.0.0',
    'SERVE_INCLUDE_SCHEMA': False,
}