import os
from typing import Optional

from embedchain.config import BaseLlmConfig
from embedchain.helpers.json_serializable import register_deserializable
from embedchain.llm.base import BaseLlm


@register_deserializable
class MistralAILlm(BaseLlm):
    def __init__(self, config: Optional[BaseLlmConfig] = None):
        super().__init__(config)
        if not self.config.api_key and "MISTRAL_API_KEY" not in os.environ:
            raise ValueError("Please set the MISTRAL_API_KEY environment variable or pass it in the config.")

    def get_llm_model_answer(self, prompt):
        return MistralAILlm._get_answer(prompt=prompt, config=self.config)

    @staticmethod
    def _get_answer(prompt: str, config: BaseLlmConfig):
        try:
            from langchain_core.messages import HumanMessage, SystemMessage
            from langchain_mistralai.chat_models import ChatMistralAI
        except ModuleNotFoundError:
            raise ModuleNotFoundError(
                "The required dependencies for MistralAI are not installed."
                'Please install with `pip install --upgrade "embedchain[mistralai]"`'
            ) from None

        api_key = config.api_key or os.getenv("MISTRAL_API_KEY")
        client = ChatMistralAI(mistral_api_key=api_key)
        messages = []
        if config.system_prompt:
            messages.append(SystemMessage(content=config.system_prompt))
        messages.append(HumanMessage(content=prompt))
        kwargs = {
            "model": config.model or "mistral-tiny",
            "temperature": config.temperature,
            "max_tokens": config.max_tokens,
            "top_p": config.top_p,
        }

        # TODO: Add support for streaming
        if config.stream:
            answer = ""
            for chunk in client.stream(**kwargs, input=messages):
                answer += chunk.content
            return answer
        else:
            response = client.invoke(**kwargs, input=messages)
            answer = response.content
            return answer