"""
Django settings for core project.

Generated by 'django-admin startproject' using Django 6.1.1.

For more information on this file, see
https://docs.djangoproject.com/en/6.1/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/6.1/ref/settings/
"""

from pathlib import Path
from datetime import timedelta
import os

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

DATA_DIR = BASE_DIR / 'data'


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/6.1/howto/deployment/checklist/

def _read_secret_key() -> str:
    """Prefer DJANGO_SECRET_KEY, else a key persisted in the (gitignored) data dir."""
    env_key = os.getenv('DJANGO_SECRET_KEY', '').strip()
    if env_key:
        return env_key

    key_file = DATA_DIR / 'secret_key.txt'
    if key_file.exists():
        stored = key_file.read_text().strip()
        if stored:
            return stored

    from django.core.management.utils import get_random_secret_key

    generated = get_random_secret_key()
    key_file.parent.mkdir(parents=True, exist_ok=True)
    key_file.write_text(generated)
    key_file.chmod(0o600)
    return generated


# SECURITY WARNING: keep the secret key used in production secret!
# This also signs every JWT, so leaking it means anyone can forge a token.
SECRET_KEY = _read_secret_key()

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = False

# Lifetimes for the hand-rolled JWTs issued in core/api.py.
JWT_ACCESS_TOKEN_LIFETIME = timedelta(days=int(os.getenv('JWT_ACCESS_DAYS', '14')))
JWT_REFRESH_TOKEN_LIFETIME = timedelta(days=int(os.getenv('JWT_REFRESH_DAYS', '30')))

ALLOWED_HOSTS = os.getenv(
    "ALLOWED_HOSTS", 
    "jastapi.mydomain.com,jast.mydomain.com,backend,localhost,127.0.0.1"
).split(",")

csrf_origins_env = os.getenv("CSRF_TRUSTED_ORIGINS", "")
if csrf_origins_env:
    CSRF_TRUSTED_ORIGINS = [origin.strip() for origin in csrf_origins_env.split(",") if origin.strip()]

else:
    CSRF_TRUSTED_ORIGINS = [
        "https://jast.mydomain.com",
        "https://jastapi.mydomain.com",
    ]

SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'core',
    'ninja',
    'corsheaders',
]

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

cors_env = os.getenv("CORS_ALLOWED_ORIGINS", "")
if cors_env:
    CORS_ALLOWED_ORIGINS = [origin.strip() for origin in cors_env.split(",") if origin.strip()]
else:
    CORS_ALLOWED_ORIGINS = [
        "https://jast.mydomain.com",
    ]

# Allow credentials (cookies/headers)
CORS_ALLOW_CREDENTIALS = True

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [BASE_DIR / 'core' / 'templates'],
        '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 = 'core.wsgi.application'


# Database
# https://docs.djangoproject.com/en/6.1/ref/settings/#databases

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


# Password validation
# https://docs.djangoproject.com/en/6.1/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/6.1/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/6.1/howto/static-files/

STATIC_URL = 'static/'


# Email
# https://docs.djangoproject.com/en/6.1/topics/email/#topic-email-configuration

MAILERS = {
    'default': {
        'BACKEND': 'django.core.mail.backends.console.EmailBackend',
    },
}
STATIC_ROOT = BASE_DIR / "staticfiles"
LOGIN_REDIRECT_URL = 'home'
LOGIN_URL = 'login'
STATIC_URL = 'static/'
STATICFILES_DIRS = [
    BASE_DIR / 'static',
]
SESSION_ENGINE = "django.contrib.sessions.backends.db"
SESSION_COOKIE_AGE = 1209600  # Persist session for 2 weeks (in seconds)
SESSION_SAVE_EVERY_REQUEST = True
SESSION_COOKIE_HTTPONLY = True