# backend/aureon_backend/settings.py

import os
from pathlib import Path
import dj_database_url
from dotenv import load_dotenv

load_dotenv()

BASE_DIR = Path(__file__).resolve().parent.parent
SECRET_KEY = os.getenv('SECRET_KEY', 'django-insecure-default-key')
DEBUG = os.getenv('DEBUG', 'True') == 'True'
ALLOWED_HOSTS = ['*']

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'rest_framework',
    'corsheaders',
    'users',
    'finance',
    'ai_assistant',
    'importer',
]

MIDDLEWARE = [
    'corsheaders.middleware.CorsMiddleware',
    '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',
]

ROOT_URLCONF = 'aureon_backend.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        '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',
            ],
        },
    },
]

WSGI_APPLICATION = 'aureon_backend.wsgi.application'

DATABASES = {
    'default': dj_database_url.config(
        default=os.getenv('DATABASE_URL'),
        conn_max_age=600,
        conn_health_checks=True,
        ssl_require=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'},
]

LANGUAGE_CODE = 'en-us'
TIME_ZONE = 'UTC'
USE_I18N = True
USE_TZ = True
STATIC_URL = 'static/'
DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

AUTH_USER_MODEL = 'users.User'

REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': [
        'users.authentication.SupabaseAuthentication',
    ],
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework.permissions.IsAuthenticated',
    ],
    'EXCEPTION_HANDLER': 'rest_framework.views.exception_handler',
}

# Supabase Configuration
SUPABASE_URL = os.getenv('SUPABASE_URL')
SUPABASE_KEY = os.getenv('SUPABASE_KEY')
SUPABASE_JWT_SECRET = os.getenv('SUPABASE_JWT_SECRET')  # Optional - only needed for HS256

# CORS Configuration
CORS_ALLOW_ALL_ORIGINS = True
CORS_ALLOW_CREDENTIALS = True
CORS_ALLOW_HEADERS = [
    'accept',
    'accept-encoding',
    'authorization',
    'content-type',
    'dnt',
    'origin',
    'user-agent',
    'x-csrftoken',
    'x-requested-with',
]
CORS_ALLOW_METHODS = [
    'DELETE',
    'GET',
    'OPTIONS',
    'PATCH',
    'POST',
    'PUT',
]

# CSRF Settings
CSRF_TRUSTED_ORIGINS = [
    origin.strip() for origin in os.getenv(
        'CSRF_TRUSTED_ORIGINS', 
        'http://localhost:5173,http://127.0.0.1:5173'
    ).split(',')
    if origin.strip()
]
CSRF_COOKIE_SECURE = not DEBUG
CSRF_COOKIE_HTTPONLY = True

# Cache Configuration (required for JWKS key caching)
CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
        'LOCATION': 'unique-snowflake',
        'TIMEOUT': 3600,  # 1 hour
        'OPTIONS': {
            'MAX_ENTRIES': 1000
        }
    }
}

# Email Settings (SendGrid)
EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_HOST = 'smtp.sendgrid.net'
EMAIL_PORT = 587
EMAIL_USE_TLS = True
EMAIL_HOST_USER = 'apikey'
EMAIL_HOST_PASSWORD = os.getenv('SENDGRID_API_KEY', '')
DEFAULT_FROM_EMAIL = os.getenv('DEFAULT_FROM_EMAIL', 'noreply@aureon.com')

# Logging Configuration
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'handlers': {
        'console': {
            'class': 'logging.StreamHandler',
        },
    },
    'root': {
        'handlers': ['console'],
        'level': 'INFO',
    },
    'loggers': {
        'django': {
            'handlers': ['console'],
            'level': 'INFO',
            'propagate': False,
        },
    },
}