settings.py

"""
Django settings for balancer_backend project.

Generated by 'django-admin startproject' using Django 4.2.3.

For more information on this file, see
https://docs.djangoproject.com/en/4.2/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/4.2/ref/settings/
"""

from pathlib import Path
import os
from datetime import timedelta

# 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/4.2/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = os.environ.get("SECRET_KEY")

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = bool(os.environ.get("DEBUG", default=0))

# Fetching the value from the environment and splitting to list if necessary.
# Fallback to '*' if the environment variable is not set.
ALLOWED_HOSTS = os.environ.get("ALLOWED_HOSTS", "*").split()

# If the environment variable contains '*', the split method would create a list with an empty string.
# So you need to check for this case and adjust accordingly.
if ALLOWED_HOSTS == ["*"] or ALLOWED_HOSTS == [""]:
    ALLOWED_HOSTS = ["*"]


# Application definition

INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
    "balancer_backend",
    "api",
    "corsheaders",
    "rest_framework",
    "djoser",
    'drf_spectacular',
]

MIDDLEWARE = [
    "django.middleware.security.SecurityMiddleware",
    "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",
    "corsheaders.middleware.CorsMiddleware",
]

ROOT_URLCONF = "balancer_backend.urls"

CORS_ALLOWED_ORIGINS = os.environ.get("CORS_ALLOWED_ORIGINS", "http://localhost:3000").split(",")

TEMPLATES = [
    {
        "BACKEND": "django.template.backends.django.DjangoTemplates",
        "DIRS": [os.path.join(BASE_DIR, "build")],
        "APP_DIRS": True,
        "OPTIONS": {
            "context_processors": [
                "django.template.context_processors.debug",
                "django.template.context_processors.request",
                "django.contrib.auth.context_processors.auth",
                "django.contrib.messages.context_processors.messages",
            ],
        },
    },
]

# Set the login redirect URL after successful email verification
# Change this to your desired URL
LOGIN_REDIRECT_URL = os.environ.get("LOGIN_REDIRECT_URL")

WSGI_APPLICATION = "balancer_backend.wsgi.application"


# Database
# https://docs.djangoproject.com/en/4.2/ref/settings/#databases

# Detect connection type based on SQL_HOST
# CloudNativePG: Kubernetes service names (e.g., "balancer-postgres-rw" or contains ".svc.cluster.local")
# AWS RDS: External hostnames (e.g., "balancer-db.xxxxx.us-east-1.rds.amazonaws.com")
SQL_HOST = os.environ.get("SQL_HOST", "localhost")
is_cloudnativepg = (
    ".svc.cluster.local" in SQL_HOST
    or not ("." in SQL_HOST and len(SQL_HOST.split(".")) > 2)
    or SQL_HOST.count(".") <= 1
)

# Build database configuration
db_config = {
        "ENGINE": os.environ.get("SQL_ENGINE", "django.db.backends.sqlite3"),
        "NAME": os.environ.get("SQL_DATABASE", BASE_DIR / "db.sqlite3"),
        "USER": os.environ.get("SQL_USER", "user"),
        "PASSWORD": os.environ.get("SQL_PASSWORD", "password"),
    "HOST": SQL_HOST,
        "PORT": os.environ.get("SQL_PORT", "5432"),
    }

# Configure SSL/TLS based on connection type
# CloudNativePG within cluster typically doesn't require SSL
# AWS RDS typically requires SSL
if db_config["ENGINE"] == "django.db.backends.postgresql":
    # Check if SSL is explicitly configured
    ssl_mode = os.environ.get("SQL_SSL_MODE", None)
    
    if ssl_mode:
        # Use explicit SSL configuration
        db_config["OPTIONS"] = {
            "sslmode": ssl_mode,
        }
    elif not is_cloudnativepg:
        # For external databases (AWS RDS), default to require SSL
        # This can be overridden by setting SQL_SSL_MODE
        db_config["OPTIONS"] = {
            "sslmode": "require",
        }
    # For CloudNativePG (within cluster), no SSL by default

DATABASES = {
    "default": db_config,
}

EMAIL_BACKEND = "django.core.mail.backends.smtp.EmailBackend"
EMAIL_HOST = "smtp.gmail.com"
EMAIL_PORT = 587
EMAIL_HOST_USER = os.environ.get("EMAIL_HOST_USER", "")
EMAIL_HOST_PASSWORD = os.environ.get("EMAIL_HOST_PASSWORD", "")
EMAIL_USE_TLS = True


# Password validation
# https://docs.djangoproject.com/en/4.2/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/4.2/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/4.2/howto/static-files/

STATIC_URL = "/static/"
STATICFILES_DIRS = [
    os.path.join(BASE_DIR, "build/static"),
]
STATIC_ROOT = os.path.join(BASE_DIR, "static")

AUTHENTICATION_BACKENDS = [
    "django.contrib.auth.backends.ModelBackend",
]


REST_FRAMEWORK = {
    "DEFAULT_PERMISSION_CLASSES": ["rest_framework.permissions.IsAuthenticated"],
    "DEFAULT_AUTHENTICATION_CLASSES": (
        "rest_framework_simplejwt.authentication.JWTAuthentication",
    ),
    'DEFAULT_SCHEMA_CLASS': 'drf_spectacular.openapi.AutoSchema',
}

SPECTACULAR_SETTINGS = {
    'TITLE': 'Balancer API',
    'DESCRIPTION': 'API for the Balancer medication decision support tool',
    'VERSION': '1.0.0',
    'SERVE_INCLUDE_SCHEMA': False,
    'SECURITY': [{'jwtAuth': []}],
    'SWAGGER_UI_SETTINGS': {
        'persistAuthorization': True,
    },
}

SIMPLE_JWT = {
    "AUTH_HEADER_TYPES": ("JWT",),
    "ACCESS_TOKEN_LIFETIME": timedelta(minutes=60),
    "REFRESH_TOKEN_LIFETIME": timedelta(days=1),
    "TOKEN_OBTAIN_SERIALIZER": "api.models.TokenObtainPairSerializer.MyTokenObtainPairSerializer",
    "AUTH_TOKEN_CLASSES": ("rest_framework_simplejwt.tokens.AccessToken",),
}

DJOSER = {
    "LOGIN_FIELD": "email",
    "USER_CREATE_PASSWORD_RETYPE": True,
    "USERNAME_CHANGED_EMAIL_CONFIRMATION": True,
    "PASSWORD_CHANGED_EMAIL_CONFIRMATION": True,
    "SEND_CONFIRMATION_EMAIL": True,
    "SET_USERNAME_RETYPE": True,
    "SET_PASSWORD_RETYPE": True,
    "PASSWORD_RESET_CONFIRM_URL": "password/reset/confirm/{uid}/{token}",
    "USERNAME_RESET_CONFIRM_URL": "email/reset/confirm/{uid}/{token}",
    "ACTIVATION_URL": "activate/{uid}/{token}",
    "SEND_ACTIVATION_EMAIL": True,
    "SOCIAL_AUTH_TOKEN_STRATEGY": "djoser.social.token.jwt.TokenStrategy",
    "SOCIAL_AUTH_ALLOWED_REDIRECT_URIS": [
        "http://localhost:8000/google",
        "http://localhost:8000/facebook",
    ],
    "SERIALIZERS": {
        "user_create": "api.models.serializers.UserCreateSerializer",
        "user": "api.models.serializers.UserCreateSerializer",
        "current_user": "api.models.serializers.UserCreateSerializer",
        "user_delete": "djoser.serializers.UserDeleteSerializer",
    },
}


# Default primary key field type
# https://docs.djangoproject.com/en/4.2/ref/settings/#default-auto-field

DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"


AUTH_USER_MODEL = "api.UserAccount"

# Logging configuration

# LOGGING = {
#     "version": 1,
#     "disable_existing_loggers": False,
#     "formatters": {
#         "verbose": {
#             "format": "{levelname} {asctime} {module} {process:d} {thread:d} {message}",
#             "style": "{",
#         },
#         "simple": {
#             "format": "{levelname} {message}",
#             "style": "{",
#         },
#     },
#     "handlers": {
#         "console": {
#             "class": "logging.StreamHandler",
#             "formatter": "verbose",
#         },
#     },
#     "root": {
#         "handlers": ["console"],
#         "level": "INFO",
#     },
# }