"""
Django settings for core project.

Generated by 'django-admin startproject' using Django 5.2.6.

For more information on this file, see
https://docs.djangoproject.com/en/5.2/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/5.2/ref/settings/
"""

from pathlib import Path
import os
import logging.config

# 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/5.2/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'django-insecure-et2fv=%$5h(^!iyo+&v+hm!#52w6)%d!hx%!kvwvx9y_%*kjdj'

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

ALLOWED_HOSTS = []


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'rest_framework',
    'rest_framework.authtoken',
    'django_filters',
    'corsheaders',
    'security',
    'incident_intelligence',
    'automation_orchestration',
    'sla_oncall',
    'collaboration_war_rooms',
    'compliance_governance',
    'analytics_predictive_insights',
    'knowledge_learning',
    'monitoring',
]

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',
    'security.middleware.zero_trust.ZeroTrustMiddleware',
    'security.middleware.zero_trust.DeviceRegistrationMiddleware',
    'security.middleware.zero_trust.RiskBasedRateLimitMiddleware',
    'incident_intelligence.security.IncidentSecurityMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'core.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 = 'core.wsgi.application'


# Database
# https://docs.djangoproject.com/en/5.2/ref/settings/#databases

# Production Database Configuration
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': os.getenv('DB_NAME', 'etb_incident_management'),
        'USER': os.getenv('DB_USER', 'etb_user'),
        'PASSWORD': os.getenv('DB_PASSWORD', 'secure_password'),
        'HOST': os.getenv('DB_HOST', 'localhost'),
        'PORT': os.getenv('DB_PORT', '5432'),
        'OPTIONS': {
            'sslmode': 'require',
            'connect_timeout': 10,
        },
        'CONN_MAX_AGE': 600,
        'CONN_HEALTH_CHECKS': True,
        'ATOMIC_REQUESTS': True,
    }
}

# Development fallback to SQLite
if DEBUG and not os.getenv('DB_HOST'):
    DATABASES = {
        'default': {
            'ENGINE': 'django.db.backends.sqlite3',
            'NAME': BASE_DIR / 'db.sqlite3',
        }
    }


# Password validation
# https://docs.djangoproject.com/en/5.2/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/5.2/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/5.2/howto/static-files/

STATIC_URL = 'static/'

# Default primary key field type
# https://docs.djangoproject.com/en/5.2/ref/settings/#default-auto-field

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

# Django REST Framework Configuration
REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': [
        'rest_framework.authentication.SessionAuthentication',
        'rest_framework.authentication.TokenAuthentication',
        'security.authentication.SSOAuthentication',
    ],
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework.permissions.IsAuthenticated',
    ],
    'DEFAULT_RENDERER_CLASSES': [
        'rest_framework.renderers.JSONRenderer',
    ],
    'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination',
    'PAGE_SIZE': 20,
}

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

# Session Security
SESSION_COOKIE_SECURE = True
SESSION_COOKIE_HTTPONLY = True
SESSION_COOKIE_AGE = 3600  # 1 hour
SESSION_EXPIRE_AT_BROWSER_CLOSE = True

# CSRF Protection
CSRF_COOKIE_SECURE = True
CSRF_COOKIE_HTTPONLY = True

# MFA Settings
MFA_ISSUER_NAME = "ETB Incident Management"
MFA_QR_CODE_SIZE = 200

# SSO Settings
SSO_PROVIDERS = {
    'saml': {
        'enabled': True,
        'entity_id': 'https://etb-incident-management.com/saml',
        'sso_url': None,  # To be configured per environment
        'x509_cert': None,  # To be configured per environment
    },
    'oauth2': {
        'enabled': True,
        'providers': {
            'google': {
                'client_id': None,  # To be configured per environment
                'client_secret': None,  # To be configured per environment
            },
            'microsoft': {
                'client_id': None,  # To be configured per environment
                'client_secret': None,  # To be configured per environment
            },
        }
    },
    'ldap': {
        'enabled': True,
        'server_uri': None,  # To be configured per environment
        'bind_dn': None,  # To be configured per environment
        'bind_password': None,  # To be configured per environment
        'user_search_base': None,  # To be configured per environment
    }
}

# Data Classification Levels
DATA_CLASSIFICATION_LEVELS = [
    'PUBLIC',
    'INTERNAL',
    'CONFIDENTIAL',
    'RESTRICTED',
    'TOP_SECRET',
]

# Audit Trail Settings
AUDIT_LOG_RETENTION_DAYS = 2555  # 7 years
AUDIT_LOG_IMMUTABLE = True

# Custom User Model
AUTH_USER_MODEL = 'security.User'

# Zero Trust Architecture Settings
ZERO_TRUST_ENABLED = True
ZERO_TRUST_STRICT_MODE = False  # Set to True for maximum security

# Geolocation API Settings
GEO_API_KEY = None  # Set your geolocation API key here
GEO_API_PROVIDER = 'ipapi'  # Options: 'ipapi', 'ipinfo', 'maxmind'

# Device Posture Assessment
DEVICE_POSTURE_ENABLED = True
DEVICE_POSTURE_STRICT_MODE = False
DEVICE_POSTURE_UPDATE_INTERVAL = 3600  # Update device posture every hour

# Risk Assessment Settings
RISK_ASSESSMENT_ENABLED = True
RISK_ASSESSMENT_CACHE_TTL = 300  # Cache risk assessments for 5 minutes
RISK_ASSESSMENT_ML_ENABLED = False  # Enable ML-based risk assessment

# Behavioral Analysis Settings
BEHAVIORAL_ANALYSIS_ENABLED = True
BEHAVIORAL_LEARNING_PERIOD = 30  # Days to learn user behavior
BEHAVIORAL_ANOMALY_THRESHOLD = 0.7  # Threshold for behavioral anomalies

# Adaptive Authentication Settings
ADAPTIVE_AUTH_ENABLED = True
ADAPTIVE_AUTH_FALLBACK_METHODS = ['PASSWORD', 'MFA_TOTP']
ADAPTIVE_AUTH_MAX_ATTEMPTS = 3
ADAPTIVE_AUTH_LOCKOUT_DURATION = 15  # minutes

# Rate Limiting Settings
RATE_LIMIT_ENABLED = True
RATE_LIMIT_BACKEND = 'memory'  # Options: 'memory', 'redis', 'database'

# Zero Trust Logging
ZERO_TRUST_LOG_LEVEL = 'INFO'  # DEBUG, INFO, WARNING, ERROR
ZERO_TRUST_LOG_AUDIT_EVENTS = True
ZERO_TRUST_LOG_RISK_ASSESSMENTS = True

# Monitoring Settings
MONITORING_ENABLED = True
MONITORING_HEALTH_CHECK_INTERVAL = 60  # seconds
MONITORING_METRICS_COLLECTION_INTERVAL = 300  # seconds (5 minutes)
MONITORING_ALERT_EVALUATION_INTERVAL = 60  # seconds
MONITORING_DATA_RETENTION_DAYS = 90
MONITORING_CLEANUP_INTERVAL = 86400  # seconds (24 hours)

# Health Check Settings
HEALTH_CHECK_TIMEOUT = 30  # seconds
HEALTH_CHECK_RETRY_COUNT = 3
HEALTH_CHECK_ENABLED_TARGETS = [
    'APPLICATION', 'DATABASE', 'CACHE', 'QUEUE', 'MODULE'
]

# Metrics Collection Settings
METRICS_COLLECTION_ENABLED = True
METRICS_AGGREGATION_METHODS = ['AVERAGE', 'SUM', 'COUNT', 'MIN', 'MAX', 'PERCENTILE_95', 'PERCENTILE_99']
METRICS_DEFAULT_RETENTION_DAYS = 90

# Alerting Settings
ALERTING_ENABLED = True
ALERTING_DEFAULT_CHANNELS = ['EMAIL']
ALERTING_EMAIL_FROM = 'monitoring@etb-api.com'
ALERTING_SLACK_WEBHOOK_URL = None  # Set in environment
ALERTING_WEBHOOK_URL = None  # Set in environment

# Dashboard Settings
DASHBOARD_AUTO_REFRESH_ENABLED = True
DASHBOARD_DEFAULT_REFRESH_INTERVAL = 30  # seconds
DASHBOARD_MAX_WIDGETS_PER_DASHBOARD = 20

# System Status Settings
SYSTEM_STATUS_ENABLED = True
SYSTEM_STATUS_UPDATE_INTERVAL = 300  # seconds (5 minutes)
SYSTEM_STATUS_NOTIFICATION_CHANNELS = ['EMAIL', 'SLACK']

# Performance Monitoring
PERFORMANCE_MONITORING_ENABLED = True
PERFORMANCE_SLOW_QUERY_THRESHOLD = 1000  # milliseconds
PERFORMANCE_API_RESPONSE_THRESHOLD = 2000  # milliseconds
PERFORMANCE_MEMORY_THRESHOLD = 80  # percentage
PERFORMANCE_CPU_THRESHOLD = 80  # percentage
PERFORMANCE_DISK_THRESHOLD = 80  # percentage

# Redis Caching Configuration
CACHES = {
    'default': {
        'BACKEND': 'django_redis.cache.RedisCache',
        'LOCATION': os.getenv('REDIS_URL', 'redis://localhost:6379/1'),
        'OPTIONS': {
            'CLIENT_CLASS': 'django_redis.client.DefaultClient',
            'CONNECTION_POOL_KWARGS': {
                'max_connections': 50,
                'retry_on_timeout': True,
                'socket_keepalive': True,
                'socket_keepalive_options': {},
            },
            'COMPRESSOR': 'django_redis.compressors.zlib.ZlibCompressor',
            'IGNORE_EXCEPTIONS': True,
        }
    },
    'sessions': {
        'BACKEND': 'django_redis.cache.RedisCache',
        'LOCATION': os.getenv('REDIS_URL', 'redis://localhost:6379/2'),
        'OPTIONS': {
            'CLIENT_CLASS': 'django_redis.client.DefaultClient',
        }
    }
}

# Session Configuration
SESSION_ENGINE = 'django.contrib.sessions.backends.cache'
SESSION_CACHE_ALIAS = 'sessions'
SESSION_COOKIE_AGE = 3600  # 1 hour
SESSION_SAVE_EVERY_REQUEST = True
SESSION_EXPIRE_AT_BROWSER_CLOSE = True

# Celery Configuration
CELERY_BROKER_URL = os.getenv('CELERY_BROKER_URL', 'redis://localhost:6379/0')
CELERY_RESULT_BACKEND = os.getenv('CELERY_RESULT_BACKEND', 'redis://localhost:6379/0')
CELERY_ACCEPT_CONTENT = ['json']
CELERY_TASK_SERIALIZER = 'json'
CELERY_RESULT_SERIALIZER = 'json'
CELERY_TIMEZONE = 'UTC'
CELERY_ENABLE_UTC = True
CELERY_BEAT_SCHEDULER = 'django_celery_beat.schedulers:DatabaseScheduler'
CELERY_WORKER_PREFETCH_MULTIPLIER = 1
CELERY_TASK_ACKS_LATE = True
CELERY_WORKER_MAX_TASKS_PER_CHILD = 1000

# Email Configuration
EMAIL_BACKEND = 'django.core.mail.backends.smtp.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').lower() == '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@etb-api.com')

# Enhanced Security Settings
SECURE_SSL_REDIRECT = not DEBUG
SECURE_HSTS_SECONDS = 31536000 if not DEBUG else 0  # 1 year
SECURE_HSTS_INCLUDE_SUBDOMAINS = True
SECURE_HSTS_PRELOAD = True
SECURE_CONTENT_TYPE_NOSNIFF = True
SECURE_BROWSER_XSS_FILTER = True
X_FRAME_OPTIONS = 'DENY'
SECURE_REFERRER_POLICY = 'strict-origin-when-cross-origin'

# API Rate Limiting
REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': [
        'rest_framework.authentication.SessionAuthentication',
        'rest_framework.authentication.TokenAuthentication',
        'security.authentication.SSOAuthentication',
    ],
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework.permissions.IsAuthenticated',
    ],
    'DEFAULT_RENDERER_CLASSES': [
        'rest_framework.renderers.JSONRenderer',
    ],
    'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination',
    'PAGE_SIZE': 20,
    'DEFAULT_THROTTLE_CLASSES': [
        'rest_framework.throttling.AnonRateThrottle',
        'rest_framework.throttling.UserRateThrottle',
        'rest_framework.throttling.ScopedRateThrottle',
    ],
    'DEFAULT_THROTTLE_RATES': {
        'anon': '100/hour',
        'user': '1000/hour',
        'login': '5/min',
        'register': '3/min',
        'password_reset': '3/min',
    },
    'DEFAULT_FILTER_BACKENDS': [
        'django_filters.rest_framework.DjangoFilterBackend',
        'rest_framework.filters.SearchFilter',
        'rest_framework.filters.OrderingFilter',
    ],
    # 'DEFAULT_VERSIONING_CLASS': 'rest_framework.versioning.URLPathVersioning',
    # 'ALLOWED_VERSIONS': ['v1', 'v2'],
    # 'DEFAULT_VERSION': 'v1',
}

# Comprehensive 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': '{',
        },
        'json': {
            'format': '{"level": "%(levelname)s", "time": "%(asctime)s", "module": "%(module)s", "process": %(process)d, "thread": %(thread)d, "message": "%(message)s"}',
        },
        'security': {
            'format': 'SECURITY: {levelname} {asctime} {module} {message}',
            'style': '{',
        },
    },
    'filters': {
        'require_debug_false': {
            '()': 'django.utils.log.RequireDebugFalse',
        },
        'require_debug_true': {
            '()': 'django.utils.log.RequireDebugTrue',
        },
    },
    'handlers': {
        'console': {
            'level': 'INFO',
            'filters': ['require_debug_true'],
            'class': 'logging.StreamHandler',
            'formatter': 'simple'
        },
        'file': {
            'level': 'INFO',
            'filters': ['require_debug_false'],
            'class': 'logging.handlers.RotatingFileHandler',
            'filename': '/var/log/etb-api/application.log',
            'maxBytes': 1024*1024*15,  # 15MB
            'backupCount': 10,
            'formatter': 'verbose',
        },
        'json_file': {
            'level': 'INFO',
            'filters': ['require_debug_false'],
            'class': 'logging.handlers.RotatingFileHandler',
            'filename': '/var/log/etb-api/application.json',
            'maxBytes': 1024*1024*15,
            'backupCount': 10,
            'formatter': 'json',
        },
        'security_file': {
            'level': 'WARNING',
            'class': 'logging.handlers.RotatingFileHandler',
            'filename': '/var/log/etb-api/security.log',
            'maxBytes': 1024*1024*15,
            'backupCount': 10,
            'formatter': 'security',
        },
        'error_file': {
            'level': 'ERROR',
            'class': 'logging.handlers.RotatingFileHandler',
            'filename': '/var/log/etb-api/error.log',
            'maxBytes': 1024*1024*15,
            'backupCount': 10,
            'formatter': 'verbose',
        },
        'mail_admins': {
            'level': 'ERROR',
            'filters': ['require_debug_false'],
            'class': 'django.utils.log.AdminEmailHandler',
            'formatter': 'verbose',
        },
    },
    'loggers': {
        'django': {
            'handlers': ['console', 'file', 'json_file'],
            'level': 'INFO',
            'propagate': True,
        },
        'django.request': {
            'handlers': ['error_file', 'mail_admins'],
            'level': 'ERROR',
            'propagate': True,
        },
        'django.security': {
            'handlers': ['security_file', 'mail_admins'],
            'level': 'WARNING',
            'propagate': True,
        },
        'etb_api': {
            'handlers': ['console', 'file', 'json_file'],
            'level': 'INFO',
            'propagate': True,
        },
        'security': {
            'handlers': ['security_file', 'mail_admins'],
            'level': 'WARNING',
            'propagate': True,
        },
        'monitoring': {
            'handlers': ['console', 'file', 'json_file'],
            'level': 'INFO',
            'propagate': True,
        },
    },
}

# Health Check Configuration
HEALTH_CHECK_ENABLED = True
HEALTH_CHECK_TIMEOUT = 30
HEALTH_CHECK_RETRY_COUNT = 3
HEALTH_CHECK_ENABLED_TARGETS = [
    'APPLICATION', 'DATABASE', 'CACHE', 'QUEUE', 'MODULE'
]

# Backup Configuration
BACKUP_ENABLED = True
BACKUP_RETENTION_DAYS = 30
BACKUP_SCHEDULE = '0 2 * * *'  # Daily at 2 AM
BACKUP_LOCATION = '/backups/etb-api/'

# API Documentation
SPECTACULAR_SETTINGS = {
    'TITLE': 'ETB Incident Management API',
    'DESCRIPTION': 'Enterprise-grade incident management and response platform',
    'VERSION': '1.0.0',
    'SERVE_INCLUDE_SCHEMA': False,
    'COMPONENT_SPLIT_REQUEST': True,
    'SCHEMA_PATH_PREFIX': '/api/v1/',
}

# CORS Configuration
CORS_ALLOWED_ORIGINS = [
    "http://localhost:3000",
    "http://127.0.0.1:3000",
]

CORS_ALLOW_CREDENTIALS = True

CORS_ALLOW_ALL_ORIGINS = True  # Only for development

CORS_ALLOW_HEADERS = [
    'accept',
    'accept-encoding',
    'authorization',
    'content-type',
    'dnt',
    'origin',
    'user-agent',
    'x-csrftoken',
    'x-requested-with',
]