from langchain_huggingface import ChatHuggingFace, HuggingFaceEndpoint
from langchain_openai import ChatOpenAI

from typing import Optional

from args import LLMInterface, Args


class AgentPreset:
    def __init__(self, interface: LLMInterface, model_name: str, temperature: Optional[float] = None, 
                 max_tokens: Optional[int] = None, repeat_penalty: Optional[float] = None):
        """
        Initialize an AgentPreset with LLM configuration parameters.
        
        Args:
            interface: The model interface to use (e.g., OPENAI, HUGGINGFACE)
            model_name: Name of the model to use
            temperature: Controls randomness in responses (0.0-1.0)
            max_tokens: Maximum number of tokens to generate in response
            repeat_penalty: Penalty for token repetition
        """
        self.interface = interface
        self.model_name = model_name
        self.temperature = temperature
        self.max_tokens = max_tokens
        self.repeat_penalty = repeat_penalty
    
    def get_interface(self) -> LLMInterface:
        """
        Get the model interface.
        
        Returns:
            LLMInterface: The interface used for this agent.
        """
        return self.interface
    
    def get_model_name(self) -> str:
        """
        Get the model name.
        
        Returns:
            str: The name of the model.
        """
        return self.model_name
    
    def get_temperature(self) -> float:
        """
        Get the temperature setting.
        
        Returns:
            float: The temperature value controlling randomness.
        """
        return self.temperature
    
    def get_max_tokens(self) -> int:
        """
        Get the maximum tokens setting.
        
        Returns:
            int: The maximum number of tokens for generation.
        """
        return self.max_tokens
    
    def get_repeat_penalty(self) -> float:
        """
        Get the repeat penalty setting.
        
        Returns:
            float: The penalty value for token repetition.
        """
        return self.repeat_penalty


class LLMFactory():

    @classmethod
    def create(cls, agent_preset: AgentPreset):
        interface = agent_preset.get_interface()

        if interface == LLMInterface.OPENAI:
            model = cls._create_openai_model(agent_preset)
        elif interface == LLMInterface.HUGGINGFACE:
            model = cls._create_huggingface_model(agent_preset)
        else:
            raise ValueError(f"Interface '{interface}' is not supported !")
        
        return model

    @staticmethod
    def _create_openai_model(agent_preset: AgentPreset):
        model_name = agent_preset.get_model_name()
        temperature = agent_preset.get_temperature()
        max_tokens = agent_preset.get_max_tokens()
        repeat_penalty = agent_preset.get_repeat_penalty()

        kwargs = {
            "model": model_name,
            "base_url": Args.api_base,
            "api_key": Args.api_key,
            "temperature": temperature,
            "max_completion_tokens": max_tokens,
            # "presence_penalty": repeat_penalty,
            "frequency_penalty": repeat_penalty
        }

        model = ChatOpenAI(**kwargs)

        return model

    @staticmethod
    def _create_huggingface_model(agent_preset: AgentPreset):
        model_name = agent_preset.get_model_name()
        temperature = agent_preset.get_temperature()
        max_tokens = agent_preset.get_max_tokens()
        repeat_penalty = agent_preset.get_repeat_penalty()

        kwargs = {
            "model": model_name,
            "temperature": temperature,
            "max_new_tokens": max_tokens,
            "repetition_penalty": repeat_penalty
        }

        llm = HuggingFaceEndpoint(**kwargs)
        model = ChatHuggingFace(llm=llm)

        return model