"""
Django settings for aibimagics project.
E-commerce Platform with AI Integration, Multi-Role System, and Production Deployment
"""

import os
from pathlib import Path
# from dotenv import load_dotenv  # Not installed yet
# import dj_database_url  # Not installed yet

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

# Load environment variables
# load_dotenv()  # Not needed for development

# SECURITY WARNING: keep the secret key used in production secret!
#SECRET_KEY = os.getenv('SECRET_KEY', 'django-insecure-change-this-in-production')
SECRET_KEY = 'django-insecure-h2g!8$7=h)i@7)r$%!@^1&y%2!$29@pxyntb52j4n0p*+-)f9i'

# SECURITY WARNING: don't run with debug turned on in production!
import os as _osdbg
#DEBUG = os.getenv('DEBUG', 'False') == 'True'
DEBUG = True

ALLOWED_HOSTS = ['aibimagics.com', 'www.aibimagics.com', '66.116.196.21']

CSRF_TRUSTED_ORIGINS = [
    'https://aibimagics.com',
    'https://www.aibimagics.com',
]


# Application definition
INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'django.contrib.sites',
    'django.contrib.sitemaps',
    #'sslserver',
    
    # Third-party apps
    'rest_framework',
    # 'rest_framework.authtoken',
    #'rest_framework_simplejwt',
    'corsheaders',
    # 'crispy_forms',
    # 'crispy_bootstrap5',
    # 'django_filters',
    # 'import_export',
    # 'imagekit',
    'drf_yasg',
    
    # Django Allauth for Social Authentication
    'allauth',
    'allauth.account',
    'allauth.socialaccount',
    # 'allauth.socialaccount.providers.google',
    # 'allauth.socialaccount.providers.facebook',
    
    # Custom apps
    'frontend',  # Site configuration & frontend
    'accounts',
    'products',
    'cart',
    'orders',
    'payments',
    'inventory',
    'ai_features',
    'notifications',
    'analytics',
    'vendors',  # Multi-vendor marketplace
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'whitenoise.middleware.WhiteNoiseMiddleware',  # Static files serving
    'corsheaders.middleware.CorsMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'frontend.maintenance_middleware.MaintenanceModeMiddleware',
    'frontend.admin_access_middleware.AdminAccessMiddleware',
    'frontend.nocache_middleware.NoCacheAuthenticatedMiddleware',
    'frontend.nocache_middleware.SecurityHeadersMiddleware',
    'frontend.nocache_middleware.RateLimitMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'allauth.account.middleware.AccountMiddleware',  # Required for allauth
    'core.middleware.NoCacheMiddleware',  # <--- ADD THIS LINE
]

ROOT_URLCONF = 'aibimagics.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [BASE_DIR / 'templates'],
        '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',
                'frontend.context_processors.site_settings',  # Dynamic site settings
                'aibimagics.context_processors.currency_symbol',  # Currency symbol
                'frontend.context_processors.staff_permissions',  # Role-based permission flags
                # 'cart.context_processors.cart_total_amount',  # Comment for now
            ],
        },
    },
]

WSGI_APPLICATION = 'aibimagics.wsgi.application'


# Database
# https://docs.djangoproject.com/en/5.0/ref/settings/#databases
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': BASE_DIR / 'db.sqlite3',
    }
}


# Custom User Model
AUTH_USER_MODEL = 'accounts.User'

# Password validation
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 = 'en-us'
TIME_ZONE = 'Asia/Kolkata'
USE_I18N = True
USE_TZ = True


# Static files (CSS, JavaScript, Images)
STATIC_URL = '/static/'
STATIC_ROOT = BASE_DIR / 'staticfiles'
# STATICFILES_DIRS = [BASE_DIR / 'static']  # Comment out - folder doesn't exist yet
# STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage'

# Media files
MEDIA_URL = '/media/'
MEDIA_ROOT = BASE_DIR / 'media'

# Default primary key field type
DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

# Site ID for django.contrib.sites
SITE_ID = 1

# CORS Settings
CORS_ALLOWED_ORIGINS = [
    "http://localhost:3000",
    "http://127.0.0.1:3000",
]
CORS_ALLOW_CREDENTIALS = True

# REST Framework
REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': [
        # 'rest_framework_simplejwt.authentication.JWTAuthentication',  # Optional - install if needed
        'rest_framework.authentication.SessionAuthentication',
    ],
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework.permissions.IsAuthenticatedOrReadOnly',
    ],
    'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination',
    'PAGE_SIZE': 20,
    'DEFAULT_FILTER_BACKENDS': [
        # 'django_filters.rest_framework.DjangoFilterBackend',  # Optional - install django-filter if needed
        'rest_framework.filters.SearchFilter',
        'rest_framework.filters.OrderingFilter',
    ],
}

# JWT Settings
from datetime import timedelta
SIMPLE_JWT = {
    'ACCESS_TOKEN_LIFETIME': timedelta(days=1),
    'REFRESH_TOKEN_LIFETIME': timedelta(days=7),
    'ROTATE_REFRESH_TOKENS': True,
    'BLACKLIST_AFTER_ROTATION': True,
}

# Crispy Forms
CRISPY_ALLOWED_TEMPLATE_PACKS = "bootstrap5"
CRISPY_TEMPLATE_PACK = "bootstrap5"



# Email Configuration
EMAIL_BACKEND = os.getenv('EMAIL_BACKEND', 'django.core.mail.backends.console.EmailBackend')
EMAIL_HOST = os.getenv('EMAIL_HOST', 'smtp.gmail.com')
EMAIL_PORT = int(os.getenv('EMAIL_PORT', 587))
EMAIL_USE_TLS = os.getenv('EMAIL_USE_TLS', 'True') == 'True'
EMAIL_HOST_USER = os.getenv('EMAIL_HOST_USER', '')
EMAIL_HOST_PASSWORD = os.getenv('EMAIL_HOST_PASSWORD', '')
DEFAULT_FROM_EMAIL = os.getenv('DEFAULT_FROM_EMAIL', 'noreply@aibimagics.com')

# Celery Configuration
CELERY_BROKER_URL = os.getenv('REDIS_URL', 'redis://localhost:6379/0')
CELERY_RESULT_BACKEND = os.getenv('REDIS_URL', 'redis://localhost:6379/0')
CELERY_ACCEPT_CONTENT = ['json']
CELERY_TASK_SERIALIZER = 'json'
CELERY_RESULT_SERIALIZER = 'json'
CELERY_TIMEZONE = TIME_ZONE

# Redis Cache - Using database cache for development
CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.db.DatabaseCache',
        'LOCATION': 'cache_table',
    }
}

# Session Configuration
SESSION_ENGINE = 'django.contrib.sessions.backends.db'  # Use database sessions

# Payment Gateway Settings
STRIPE_PUBLIC_KEY = os.getenv('STRIPE_PUBLIC_KEY', '')
STRIPE_SECRET_KEY = os.getenv('STRIPE_SECRET_KEY', '')
RAZORPAY_KEY_ID = os.getenv('RAZORPAY_KEY_ID', '')
RAZORPAY_KEY_SECRET = os.getenv('RAZORPAY_KEY_SECRET', '')

# AI API Keys
OPENAI_API_KEY = os.getenv('OPENAI_API_KEY', '')
ANTHROPIC_API_KEY = os.getenv('ANTHROPIC_API_KEY', '')

# Twilio SMS Settings
TWILIO_ACCOUNT_SID = os.getenv('TWILIO_ACCOUNT_SID', '')
TWILIO_AUTH_TOKEN = os.getenv('TWILIO_AUTH_TOKEN', '')
TWILIO_PHONE_NUMBER = os.getenv('TWILIO_PHONE_NUMBER', '')
BANK_API_BASE_URL = os.getenv('BANK_API_BASE_URL', '')
BANK_API_TOKEN = os.getenv('BANK_API_TOKEN', '')

# Security Settings (Production)
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
    X_FRAME_OPTIONS = 'DENY'
    SECURE_HSTS_SECONDS = 31536000
    SECURE_HSTS_INCLUDE_SUBDOMAINS = True
    SECURE_HSTS_PRELOAD = True
SESSION_COOKIE_HTTPONLY = True
CSRF_COOKIE_HTTPONLY = True
SECURE_REFERRER_POLICY = 'strict-origin-when-cross-origin'
SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')

# Logging
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'verbose': {
            'format': '{levelname} {asctime} {module} {message}',
            'style': '{',
        },
    },
    'handlers': {
        'file': {
            'level': 'INFO',
            'class': 'logging.FileHandler',
            'filename': BASE_DIR / 'logs' / 'django.log',
            'formatter': 'verbose',
        },
        'console': {
            'level': 'DEBUG',
            'class': 'logging.StreamHandler',
            'formatter': 'verbose',
        },
    },
    'loggers': {
        'django': {
            'handlers': ['file', 'console'],
            'level': 'INFO',
            'propagate': True,
        },
    },
}

# Sentry Error Monitoring (Production)
if not DEBUG and os.getenv('SENTRY_DSN'):
    import sentry_sdk
    from sentry_sdk.integrations.django import DjangoIntegration
    
    sentry_sdk.init(
        dsn=os.getenv('SENTRY_DSN'),
        integrations=[DjangoIntegration()],
        traces_sample_rate=1.0,
        send_default_pii=True
    )

# ==============================================================================
# ENHANCED SECURITY SETTINGS
# ==============================================================================

# Session Security
SESSION_COOKIE_HTTPONLY = True
SESSION_COOKIE_SECURE = not DEBUG  # True in production
SESSION_COOKIE_SAMESITE = 'Lax'
SESSION_COOKIE_AGE = 86400  # 24 hours

# CSRF Protection
CSRF_COOKIE_HTTPONLY = False  # Allow JavaScript to read CSRF token for AJAX requests
CSRF_COOKIE_SECURE = not DEBUG
CSRF_COOKIE_SAMESITE = 'Lax'
CSRF_USE_SESSIONS = False
CSRF_COOKIE_AGE = 31449600  # 1 year
CSRF_TRUSTED_ORIGINS = ['http://127.0.0.1:8000', 'http://localhost:8000']

# Security Headers
SECURE_BROWSER_XSS_FILTER = True
SECURE_CONTENT_TYPE_NOSNIFF = True
X_FRAME_OPTIONS = 'DENY'

if not DEBUG:
    # SSL/HTTPS
    SECURE_SSL_REDIRECT = True
    SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')
    
    # HSTS Settings
    SECURE_HSTS_SECONDS = 31536000  # 1 year
    SECURE_HSTS_INCLUDE_SUBDOMAINS = True
    SECURE_HSTS_PRELOAD = True

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
        'OPTIONS': {
            'min_length': 8,
        }
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]

# Login/Logout URLs
# Use customer login for general views; staff views have separate URLs
LOGIN_URL = '/login/'
LOGIN_REDIRECT_URL = '/staff/dashboard/'
LOGOUT_REDIRECT_URL = '/login/'

# Authentication Backends
AUTHENTICATION_BACKENDS = [
    'django.contrib.auth.backends.ModelBackend',  # Default Django auth
    'allauth.account.auth_backends.AuthenticationBackend',  # Allauth social auth
]

# Rate Limiting (if using django-ratelimit)
RATELIMIT_ENABLE = True
RATELIMIT_USE_CACHE = 'default'

# File Upload Security
FILE_UPLOAD_MAX_MEMORY_SIZE = 5242880  # 5MB
DATA_UPLOAD_MAX_MEMORY_SIZE = 5242880  # 5MB
FILE_UPLOAD_PERMISSIONS = 0o644

# Allowed file extensions for uploads
ALLOWED_IMAGE_EXTENSIONS = ['.jpg', '.jpeg', '.png', '.gif', '.webp']
ALLOWED_DOCUMENT_EXTENSIONS = ['.pdf', '.doc', '.docx', '.xls', '.xlsx']

# Security Middleware Settings
SECURE_REFERRER_POLICY = 'same-origin'
SECURE_CROSS_ORIGIN_OPENER_POLICY = 'same-origin'

# ==============================================================================
# STAFF PANEL SECURITY
# ==============================================================================

# Staff session expires after 8 hours of inactivity
STAFF_SESSION_TIMEOUT = 28800

# Require staff to re-authenticate for sensitive operations
STAFF_REAUTH_REQUIRED = True

# Log all staff actions
STAFF_AUDIT_LOG = True

# ==============================================================================
# DJANGO-ALLAUTH SOCIAL AUTHENTICATION SETTINGS
# ==============================================================================

# Allauth Configuration (Updated for django-allauth 65+)
ACCOUNT_LOGIN_METHODS = {'email'}
ACCOUNT_AUTHENTICATION_METHOD = 'email'
ACCOUNT_EMAIL_REQUIRED = True
ACCOUNT_EMAIL_VERIFICATION = 'optional'
ACCOUNT_LOGIN_ON_EMAIL_CONFIRMATION = True
ACCOUNT_UNIQUE_EMAIL = True
ACCOUNT_USER_MODEL_USERNAME_FIELD = None
ACCOUNT_SESSION_REMEMBER = True
ACCOUNT_USERNAME_REQUIRED = False

ACCOUNT_SIGNUP_FIELDS = ['email*', 'password1*', 'password2*']

# Social Account Settings
SOCIALACCOUNT_AUTO_SIGNUP = True  # Automatically create account on first social login
SOCIALACCOUNT_EMAIL_VERIFICATION = 'optional'
SOCIALACCOUNT_EMAIL_REQUIRED = True
SOCIALACCOUNT_QUERY_EMAIL = True
SOCIALACCOUNT_STORE_TOKENS = True  # Store OAuth tokens

# Google OAuth Settings
SOCIALACCOUNT_PROVIDERS = {
    'google': {
        'SCOPE': [
            'profile',
            'email',
        ],
        'AUTH_PARAMS': {
            'access_type': 'online',
        },
        'APP': {
            'client_id': os.getenv('GOOGLE_CLIENT_ID', ''),
            'secret': os.getenv('GOOGLE_CLIENT_SECRET', ''),
            'key': ''
        }
    },
    'facebook': {
        'METHOD': 'oauth2',
        'SCOPE': ['email', 'public_profile'],
        'AUTH_PARAMS': {'auth_type': 'reauthenticate'},
        'FIELDS': [
            'id',
            'email',
            'name',
            'first_name',
            'last_name',
            'verified',
            'locale',
            'timezone',
            'link',
            'gender',
            'updated_time',
        ],
        'EXCHANGE_TOKEN': True,
        'VERIFIED_EMAIL': False,
        'VERSION': 'v18.0',
        'APP': {
            'client_id': os.getenv('FACEBOOK_APP_ID', ''),
            'secret': os.getenv('FACEBOOK_APP_SECRET', ''),
            'key': ''
        }
    },
}

# Redirect URLs after social login
SOCIALACCOUNT_LOGIN_ON_GET = True
# LOGIN_REDIRECT_URL is set above in the staff panel section (line 351)
ACCOUNT_LOGOUT_REDIRECT_URL = '/'

# ==============================================================================
# CURRENCY SETTINGS
# ==============================================================================

# Default currency
DEFAULT_CURRENCY = 'INR'
CURRENCY_SYMBOL = '₹'
CURRENCY_CODE = 'INR'