"""
LLM Provider Factory for Flare
"""
import os
from typing import Optional, Dict, Any
from dotenv import load_dotenv

from llm_interface import LLMInterface, SparkLLM, GPT4oLLM
from config_provider import ConfigProvider
from utils import log

class LLMFactory:
    """Factory class to create appropriate LLM provider based on llm_provider config"""
    
    @staticmethod
    def create_provider() -> LLMInterface:
        """Create and return appropriate LLM provider based on config"""
        cfg = ConfigProvider.get()
        llm_provider = cfg.global_config.llm_provider
        
        if not llm_provider or not llm_provider.name:
            raise ValueError("No LLM provider configured")
        
        provider_name = llm_provider.name
        log(f"🏭 Creating LLM provider: {provider_name}")
        
        # Get provider config
        provider_config = cfg.global_config.get_provider_config("llm", provider_name)
        if not provider_config:
            raise ValueError(f"Unknown LLM provider: {provider_name}")
        
        # Get API key
        api_key = LLMFactory._get_api_key(provider_name)
        if not api_key and provider_config.requires_api_key:
            raise ValueError(f"API key required for {provider_name} but not configured")
        
        # Get settings
        settings = llm_provider.settings or {}
        
        # Create appropriate provider
        if provider_name == "spark":
            return LLMFactory._create_spark_provider(api_key, llm_provider.endpoint, settings)
        elif provider_name in ("gpt4o", "gpt4o-mini"):
            return LLMFactory._create_gpt_provider(provider_name, api_key, settings)
        else:
            raise ValueError(f"Unsupported LLM provider: {provider_name}")
    
    @staticmethod
    def _create_spark_provider(api_key: str, endpoint: Optional[str], settings: Dict[str, Any]) -> SparkLLM:
        """Create Spark LLM provider"""
        if not endpoint:
            raise ValueError("Spark requires endpoint to be configured")
        
        log(f"🚀 Creating SparkLLM provider")
        log(f"📍 Endpoint: {endpoint}")
        
        # Determine provider variant for backward compatibility
        provider_variant = "spark-cloud"
        if not ConfigProvider.get().global_config.is_cloud_mode():
            provider_variant = "spark-onpremise"
        
        return SparkLLM(
            spark_endpoint=str(endpoint),
            spark_token=api_key,
            provider_variant=provider_variant,
            settings=settings
        )
    
    @staticmethod
    def _create_gpt_provider(model_type: str, api_key: str, settings: Dict[str, Any]) -> GPT4oLLM:
        """Create GPT-4o LLM provider"""
        # Determine model
        model = "gpt-4o-mini" if model_type == "gpt4o-mini" else "gpt-4o"
        
        log(f"🤖 Creating GPT4oLLM provider with model: {model}")
        
        return GPT4oLLM(
            api_key=api_key,
            model=model,
            settings=settings
        )
    
    @staticmethod
    def _get_api_key(provider_name: str) -> Optional[str]:
        """Get API key from config or environment"""
        cfg = ConfigProvider.get()
        
        # First check encrypted config
        api_key = cfg.global_config.get_plain_api_key("llm")
        if api_key:
            log("🔑 Using decrypted API key from config")
            return api_key
        
        # Then check environment based on provider
        env_var_map = {
            "spark": "SPARK_TOKEN",
            "gpt4o": "OPENAI_API_KEY",
            "gpt4o-mini": "OPENAI_API_KEY",
        }
        
        env_var = env_var_map.get(provider_name)
        if env_var:
            # Check if running in HuggingFace Space
            if os.environ.get("SPACE_ID"):
                api_key = os.environ.get(env_var)
                if api_key:
                    log(f"🔑 Using {env_var} from HuggingFace secrets")
                    return api_key
            else:
                # Local development
                load_dotenv()
                api_key = os.getenv(env_var)
                if api_key:
                    log(f"🔑 Using {env_var} from .env file")
                    return api_key
        
        return None