from pathlib import Path
import os

BASE_DIR = Path(__file__).resolve().parent.parent

SECRET_KEY = os.getenv('DJANGO_SECRET_KEY', 'dev-insecure-change-me')
DEBUG = os.getenv('DJANGO_DEBUG', '1') == '1'
ALLOWED_HOSTS = [h.strip() for h in os.getenv('DJANGO_ALLOWED_HOSTS', '127.0.0.1,localhost,10.0.2.2,.hf.space').split(',') if h.strip()]

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'apps.chat.apps.ChatConfig',
    'apps.service_intents.apps.ServiceIntentsConfig',
    'apps.model_ops.apps.ModelOpsConfig',
]

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',
]

ROOT_URLCONF = 'chatbot.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',
            ],
        },
    },
]

WSGI_APPLICATION = 'chatbot.wsgi.application'

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

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/'
STATIC_ROOT = BASE_DIR / 'staticfiles'

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

# Deployed orchestration service. Individual service definitions append their own path.
N8N_BASE_URL = os.getenv('N8N_BASE_URL', 'https://mortadhabbb-n8n-service-orchestration.hf.space')
N8N_TIMEOUT = int(os.getenv('N8N_TIMEOUT', '10'))

# API key for /api/chat
CHATBOT_API_KEY = os.getenv('CHATBOT_API_KEY', '')

# Dataset
QA_CSV = os.getenv('QA_CSV', 'apps/chat/training_models/data/chatbot.csv')
SERVICE_INTENTS_CSV = os.getenv('SERVICE_INTENTS_CSV', 'apps/chat/training_models/data/service_intents.csv')
SERVICE_INTENT_MODEL_TRAINING_CSV = os.getenv(
    'SERVICE_INTENT_MODEL_TRAINING_CSV',
    'apps/chat/training_models/data/service_intents_model_training.csv',
)
SERVICE_INTENT_BASE_MODEL_ID = os.getenv('SERVICE_INTENT_BASE_MODEL_ID', 'google/flan-t5-base')
SERVICE_INTENT_MODEL_DIR = os.getenv(
    'SERVICE_INTENT_MODEL_DIR',
    str(BASE_DIR / 'artifacts' / 'service_intent_model'),
)
SERVICE_INTENT_BASE_MODEL_DIR = os.getenv(
    'SERVICE_INTENT_BASE_MODEL_DIR',
    str(BASE_DIR / 'artifacts' / 'hf_base_models' / SERVICE_INTENT_BASE_MODEL_ID.replace('/', '__')),
)
SERVICE_INTENT_QUANTIZED_MODEL_DIR = os.getenv(
    'SERVICE_INTENT_QUANTIZED_MODEL_DIR',
    str(BASE_DIR / 'artifacts' / 'service_intent_model_quantized'),
)
SERVICE_INTENT_EXTRACTOR_ENABLED = os.getenv('SERVICE_INTENT_EXTRACTOR_ENABLED', 'True') == 'True'
SERVICE_INTENT_EXTRACTOR_MAX_NEW_TOKENS = int(os.getenv('SERVICE_INTENT_EXTRACTOR_MAX_NEW_TOKENS', '256'))
SERVICE_INTENT_TRAINING_SPACE_URL = os.getenv(
    'SERVICE_INTENT_TRAINING_SPACE_URL',
    'https://mortadhabbb-train-model-chatbot.hf.space',
)
SERVICE_INTENT_TRAINING_SPACE_API_KEY = os.getenv('SERVICE_INTENT_TRAINING_SPACE_API_KEY', '')
SERVICE_INTENT_TRAINING_OUTPUT_REPO_ID = os.getenv('SERVICE_INTENT_TRAINING_OUTPUT_REPO_ID', '')
SERVICE_INTENT_TRAINING_POLL_SECONDS = int(os.getenv('SERVICE_INTENT_TRAINING_POLL_SECONDS', '20'))

# Hugging Face
HF_TOKEN = os.getenv('HF_TOKEN', '')
HF_SPACE_ID = os.getenv('HF_SPACE_ID', 'mortadhabbb/chatbot-sports_academies-system')
SPRING_CHATBOT_FILES_DIR = os.getenv(
    'SPRING_CHATBOT_FILES_DIR',
    str(BASE_DIR.parent.parent / 'sports_management_project' / 'src' / 'main' / 'resources' / 'Files' / 'chatbotFiles')
)
CHATBOT_TRANSLATION_ENABLED = os.getenv('CHATBOT_TRANSLATION_ENABLED', 'True') == 'True'

# Tuning
MIN_SIM = float(os.getenv('MIN_SIM', '0.18'))
FUZZY_MIN = int(os.getenv('FUZZY_MIN', '90'))

# ============================================================================
# LOGGING CONFIGURATION (Production-Ready)
# ============================================================================
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'verbose': {
            'format': '[{levelname}] {asctime} {module} {funcName}:{lineno} - {message}',
            'style': '{',
            'datefmt': '%Y-%m-%d %H:%M:%S',
        },
        'simple': {
            'format': '[{levelname}] {message}',
            'style': '{',
        },
    },
    'filters': {
        'require_debug_false': {
            '()': 'django.utils.log.RequireDebugFalse',
        },
        'require_debug_true': {
            '()': 'django.utils.log.RequireDebugTrue',
        },
    },
    'handlers': {
        'console': {
            'level': 'DEBUG' if DEBUG else 'INFO',
            'class': 'logging.StreamHandler',
            'formatter': 'verbose',
        },
        'file': {
            'level': 'INFO',
            'class': 'logging.handlers.RotatingFileHandler',
            'filename': BASE_DIR / 'logs' / 'chatbot.log',
            'maxBytes': 10485760,  # 10MB
            'backupCount': 5,
            'formatter': 'verbose',
        },
        'error_file': {
            'level': 'ERROR',
            'class': 'logging.handlers.RotatingFileHandler',
            'filename': BASE_DIR / 'logs' / 'errors.log',
            'maxBytes': 10485760,  # 10MB
            'backupCount': 5,
            'formatter': 'verbose',
        },
    },
    'loggers': {
        'django': {
            'handlers': ['console', 'file'],
            'level': 'INFO',
            'propagate': False,
        },
        'chatbot': {
            'handlers': ['console', 'file', 'error_file'],
            'level': 'DEBUG' if DEBUG else 'INFO',
            'propagate': False,
        },
        'ml_index': {
            'handlers': ['console', 'file'],
            'level': 'INFO',
            'propagate': False,
        },
    },
}

# Create logs directory if it doesn't exist
LOGS_DIR = BASE_DIR / 'logs'
LOGS_DIR.mkdir(exist_ok=True)

# ============================================================================
# CACHING CONFIGURATION (Development/Production)
# ============================================================================
if os.getenv('DJANGO_CACHE_BACKEND', '').strip().lower() == 'locmem' or DEBUG:
    # Development: in-memory cache
    CACHES = {
        'default': {
            'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
            'LOCATION': 'chatbot-cache',
            'TIMEOUT': 3600,
            'OPTIONS': {'MAX_ENTRIES': 1000}
        }
    }
else:
    # Production: can be replaced with Redis/Memcached
    CACHES = {
        'default': {
            'BACKEND': 'django.core.cache.backends.db.DatabaseCache',
            'LOCATION': 'cache_table',
            'OPTIONS': {'MAX_ENTRIES': 5000}
        }
    }

# ============================================================================
# SECURITY CONFIGURATION
# ============================================================================
if not DEBUG:
    SECURE_SSL_REDIRECT = os.getenv('SECURE_SSL_REDIRECT', 'False') == 'True'
    SESSION_COOKIE_SECURE = os.getenv('SESSION_COOKIE_SECURE', 'False') == 'True'
    CSRF_COOKIE_SECURE = os.getenv('CSRF_COOKIE_SECURE', 'False') == 'True'
    SECURE_HSTS_SECONDS = int(os.getenv('SECURE_HSTS_SECONDS', '31536000'))
    SECURE_HSTS_INCLUDE_SUBDOMAINS = True
    SECURE_HSTS_PRELOAD = True

SECURE_CONTENT_SECURITY_POLICY = {
    'default-src': ("'self'",),
    'script-src': ("'self'", "'unsafe-inline'"),
    'style-src': ("'self'", "'unsafe-inline'"),
}

# ============================================================================
# RATE LIMITING & THROTTLING
# ============================================================================
RATE_LIMIT_ENABLED = os.getenv('RATE_LIMIT_ENABLED', 'True') == 'True'
RATE_LIMIT_REQUESTS = int(os.getenv('RATE_LIMIT_REQUESTS', '100'))  # per minute
RATE_LIMIT_PERIOD = int(os.getenv('RATE_LIMIT_PERIOD', '60'))  # seconds

# ============================================================================
# CHATBOT MONITORING
# ============================================================================
CHATBOT_MAX_MESSAGE_LENGTH = 1000
CHATBOT_REQUEST_TIMEOUT = 30  # seconds
CHATBOT_ENABLE_METRICS = True

# Chatbot microservice-owned datasets
CHATBOT_DATA_CSV = os.getenv("CHATBOT_DATA_CSV", str(BASE_DIR / "apps" / "chat" / "training_models" / "data" / "data.csv"))
CHATBOT_MARKERS_CSV = os.getenv("CHATBOT_MARKERS_CSV", str(BASE_DIR / "apps" / "chat" / "training_models" / "data" / "markers_finetune_real_examples.csv"))
CHATBOT_SERVICE_INTENTS_CSV = os.getenv("CHATBOT_SERVICE_INTENTS_CSV", str(BASE_DIR / "apps" / "chat" / "training_models" / "data" / "service_intents.csv"))
# Extraction manifest: services for which the slot extractor model is allowed to run.
SERVICE_EXTRACTION_MANIFEST = os.getenv('SERVICE_EXTRACTION_MANIFEST', 'apps/chat/training_models/data/service_extraction_manifest.json')