from pydantic_settings import BaseSettings
from typing import Optional, Dict, Any, List
import os
from functools import lru_cache

class Settings(BaseSettings):
    """
    Application settings loaded from environment variables or .env file
    """
    # API keys
    GROQ_API_KEY: str
    
    # LLM settings
    MODEL_NAME: str = "qwen-2.5-32b"
    MAX_TOKENS: int = 2048
    TEMPERATURE: float = 0.5
    FALLBACK_TEMPERATURE: float = 0.7
    GRAMMAR_CORRECTION_TEMPERATURE: float = 0.3
    
    # SQLite settings
    SQLITE_DB_PATH: str = os.environ.get("SQLITE_DB_PATH", "profiles.db")
    
    # Service settings
    API_HOST: str = os.environ.get("API_HOST", "0.0.0.0")  # Changed from localhost to 0.0.0.0
    API_PORT: int = int(os.environ.get("API_PORT", "8000"))
    
    # External-facing URL for API (this should be set in production)
    EXTERNAL_API_URL: str = os.environ.get("EXTERNAL_API_URL", "")
    
    # API URL - will use external URL if provided, otherwise build from host/port
    API_URL: str = os.environ.get("API_URL", EXTERNAL_API_URL or f"http://{API_HOST}:{API_PORT}")
    
    # Allowed origins for CORS
    ALLOWED_ORIGINS: List[str] = ["*"]
    
    # Streamlit settings
    STREAMLIT_PORT: int = int(os.environ.get("STREAMLIT_SERVER_PORT", "8501"))
    
    # Application settings
    CACHE_SIZE: int = 100
    CHUNK_SIZE: int = 1000
    DEBUG: bool = os.environ.get("DEBUG", "").lower() == "true"
    
    # File settings
    TEMP_FILE_DIR: str = os.environ.get("TEMP_FILE_DIR", "./")
    
    class Config:
        env_file = ".env"
        case_sensitive = True

@lru_cache()
def get_settings() -> Settings:
    """
    Get cached settings instance
    """
    return Settings()