"""
Configuration Module
Author: RSK World (https://rskworld.in)
Founder: Molla Samser
Designer & Tester: Rima Khatun
Contact: help@rskworld.in, +91 93305 39277
Year: 2026
Description: Configuration settings for multi-language chatbot
"""

import os
from dotenv import load_dotenv

# Load environment variables
load_dotenv()

class Config:
    """Base configuration"""
    
    # Basic Flask Configuration
    SECRET_KEY = os.getenv('SECRET_KEY', 'multi-language-chatbot-rsk-world-2026')
    DEBUG = os.getenv('FLASK_DEBUG', 'False').lower() == 'true'
    
    # Server Configuration
    HOST = os.getenv('HOST', '0.0.0.0')
    PORT = int(os.getenv('PORT', 5000))
    
    # API Keys
    OPENAI_API_KEY = os.getenv('OPENAI_API_KEY')
    GOOGLE_TRANSLATE_API_KEY = os.getenv('GOOGLE_TRANSLATE_API_KEY')
    
    # Chatbot Configuration
    MAX_CONVERSATION_LENGTH = int(os.getenv('MAX_CONVERSATION_LENGTH', 20))
    DEFAULT_LANGUAGE = os.getenv('DEFAULT_LANGUAGE', 'en')
    SUPPORTED_LANGUAGES = os.getenv('SUPPORTED_LANGUAGES', 'en,hi,bn,es,fr,de,zh,ja,ar,pt,ru,it').split(',')
    
    # Cultural Adaptation
    CULTURAL_ADAPTATION_ENABLED = os.getenv('CULTURAL_ADAPTATION_ENABLED', 'True').lower() == 'true'
    TIMEZONE_AWARENESS = os.getenv('TIMEZONE_AWARENESS', 'True').lower() == 'true'
    
    # Security
    CORS_ORIGINS = os.getenv('CORS_ORIGINS', '*').split(',')
    ENABLE_HTTPS = os.getenv('ENABLE_HTTPS', 'False').lower() == 'true'
    
    # Rate Limiting
    RATE_LIMIT_PER_MINUTE = int(os.getenv('RATE_LIMIT_PER_MINUTE', 60))
    
    # Logging
    LOG_LEVEL = os.getenv('LOG_LEVEL', 'INFO')
    LOG_FILE = os.getenv('LOG_FILE', 'logs/chatbot.log')
    
    # Database (Optional)
    DATABASE_URL = os.getenv('DATABASE_URL', 'sqlite:///chatbot.db')
    
    # Redis (Optional for caching)
    REDIS_URL = os.getenv('REDIS_URL', 'redis://localhost:6379/0')
    
    # Analytics
    ENABLE_ANALYTICS = os.getenv('ENABLE_ANALYTICS', 'False').lower() == 'true'
    ANALYTICS_API_KEY = os.getenv('ANALYTICS_API_KEY')
    
    # Language Detection Settings
    LANGUAGE_DETECTION_CONFIDENCE_THRESHOLD = float(os.getenv('LANGUAGE_DETECTION_CONFIDENCE_THRESHOLD', 0.7))
    
    # Translation Settings
    TRANSLATION_CACHE_SIZE = int(os.getenv('TRANSLATION_CACHE_SIZE', 1000))
    TRANSLATION_TIMEOUT = int(os.getenv('TRANSLATION_TIMEOUT', 10))
    
    # OpenAI Settings
    OPENAI_MODEL = os.getenv('OPENAI_MODEL', 'gpt-3.5-turbo')
    OPENAI_MAX_TOKENS = int(os.getenv('OPENAI_MAX_TOKENS', 500))
    OPENAI_TEMPERATURE = float(os.getenv('OPENAI_TEMPERATURE', 0.7))
    
    @staticmethod
    def init_app(app):
        """Initialize application with configuration"""
        pass

class DevelopmentConfig(Config):
    """Development configuration"""
    DEBUG = True
    LOG_LEVEL = 'DEBUG'

class ProductionConfig(Config):
    """Production configuration"""
    DEBUG = False
    ENABLE_HTTPS = True
    
    @classmethod
    def init_app(cls, app):
        Config.init_app(app)
        
        # Production-specific initialization
        import logging
        from logging.handlers import RotatingFileHandler
        
        if not app.debug:
            file_handler = RotatingFileHandler(
                cls.LOG_FILE, 
                maxBytes=10240000, 
                backupCount=10
            )
            file_handler.setFormatter(logging.Formatter(
                '%(asctime)s %(levelname)s: %(message)s [in %(pathname)s:%(lineno)d]'
            ))
            file_handler.setLevel(logging.INFO)
            app.logger.addHandler(file_handler)
            app.logger.setLevel(logging.INFO)
            app.logger.info('Multi-language Chatbot startup')

class TestingConfig(Config):
    """Testing configuration"""
    TESTING = True
    OPENAI_API_KEY = 'test-key'
    DEBUG = True

# Configuration dictionary
config = {
    'development': DevelopmentConfig,
    'production': ProductionConfig,
    'testing': TestingConfig,
    'default': DevelopmentConfig
}

def get_config():
    """Get current configuration based on environment"""
    env = os.getenv('FLASK_ENV', 'development')
    return config.get(env, config['default'])