"""Configuration management for the chat agent application."""

import os
from dotenv import load_dotenv

# Load environment variables from .env file
load_dotenv()


class Config:
    """Base configuration class."""
    
    # Flask Configuration
    SECRET_KEY = os.getenv('SECRET_KEY', 'dev-secret-key-change-in-production')
    FLASK_ENV = os.getenv('FLASK_ENV', 'development')
    DEBUG = os.getenv('FLASK_DEBUG', 'True').lower() == 'true'
    
    # Groq API Configuration
    GROQ_API_KEY = os.getenv('GROQ_API_KEY')
    GROQ_MODEL = os.getenv('GROQ_MODEL', 'mixtral-8x7b-32768')
    
    # Database Configuration
    DATABASE_URL = os.getenv('DATABASE_URL', 'postgresql://localhost:5432/chat_agent_db')
    SQLALCHEMY_DATABASE_URI = DATABASE_URL
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    
    # Redis Configuration
    REDIS_URL = os.getenv('REDIS_URL', 'redis://localhost:6379/0')
    REDIS_HOST = os.getenv('REDIS_HOST', 'localhost')
    REDIS_PORT = int(os.getenv('REDIS_PORT', 6379))
    REDIS_DB = int(os.getenv('REDIS_DB', 0))
    REDIS_PASSWORD = os.getenv('REDIS_PASSWORD', None)
    
    # Session Configuration
    SESSION_TYPE = 'redis'
    SESSION_PERMANENT = False
    SESSION_USE_SIGNER = True
    SESSION_KEY_PREFIX = os.getenv('SESSION_KEY_PREFIX', 'chat_agent:')
    
    # Chat Agent Configuration
    DEFAULT_LANGUAGE = os.getenv('DEFAULT_LANGUAGE', 'python')
    MAX_CHAT_HISTORY = int(os.getenv('MAX_CHAT_HISTORY', 20))
    CONTEXT_WINDOW_SIZE = int(os.getenv('CONTEXT_WINDOW_SIZE', 10))
    SESSION_TIMEOUT = int(os.getenv('SESSION_TIMEOUT', 3600))
    
    # API Configuration
    MAX_TOKENS = int(os.getenv('MAX_TOKENS', 2048))
    TEMPERATURE = float(os.getenv('TEMPERATURE', 0.7))
    STREAM_RESPONSES = os.getenv('STREAM_RESPONSES', 'True').lower() == 'true'
    
    # Logging Configuration
    LOG_LEVEL = os.getenv('LOG_LEVEL', 'INFO')
    LOG_FILE = os.getenv('LOG_FILE', 'chat_agent.log')
    
    # Performance Configuration
    ENABLE_COMPRESSION = os.getenv('ENABLE_COMPRESSION', 'True').lower() == 'true'
    ENABLE_CACHING = os.getenv('ENABLE_CACHING', 'True').lower() == 'true'
    
    # Database Connection Pool Configuration
    DB_POOL_SIZE = int(os.getenv('DB_POOL_SIZE', '10'))
    DB_MAX_OVERFLOW = int(os.getenv('DB_MAX_OVERFLOW', '20'))
    DB_POOL_RECYCLE = int(os.getenv('DB_POOL_RECYCLE', '3600'))
    DB_POOL_TIMEOUT = int(os.getenv('DB_POOL_TIMEOUT', '30'))
    
    # Redis Connection Pool Configuration
    REDIS_MAX_CONNECTIONS = int(os.getenv('REDIS_MAX_CONNECTIONS', '20'))
    REDIS_SOCKET_TIMEOUT = int(os.getenv('REDIS_SOCKET_TIMEOUT', '5'))
    REDIS_CONNECT_TIMEOUT = int(os.getenv('REDIS_CONNECT_TIMEOUT', '5'))
    REDIS_HEALTH_CHECK_INTERVAL = int(os.getenv('REDIS_HEALTH_CHECK_INTERVAL', '30'))
    
    # Cache Configuration
    CACHE_DEFAULT_TTL = int(os.getenv('CACHE_DEFAULT_TTL', '3600'))
    CACHE_RESPONSE_TTL = int(os.getenv('CACHE_RESPONSE_TTL', '1800'))
    CACHE_LANGUAGE_CONTEXT_TTL = int(os.getenv('CACHE_LANGUAGE_CONTEXT_TTL', '86400'))
    
    # Performance Monitoring
    ENABLE_PERFORMANCE_MONITORING = os.getenv('ENABLE_PERFORMANCE_MONITORING', 'True').lower() == 'true'


class DevelopmentConfig(Config):
    """Development configuration."""
    DEBUG = True
    TESTING = False


class ProductionConfig(Config):
    """Production configuration."""
    DEBUG = False
    TESTING = False


class TestingConfig(Config):
    """Testing configuration."""
    TESTING = True
    DEBUG = True
    # Use in-memory SQLite for testing
    SQLALCHEMY_DATABASE_URI = 'sqlite:///:memory:'
    # Use separate Redis DB for testing
    REDIS_DB = 1
    # For testing without Redis server, use None to disable Redis features
    REDIS_URL = os.getenv('REDIS_URL', None)  # Set to None to disable Redis in tests


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