"""LLM 模型枚举与实例获取

Usage:
    from app.ai.models import LLM

    llm = LLM.DOUBAO_PRO_256K.create(temperature=0)
    llm = LLM.DEEPSEEK_V3.create()
"""

from enum import Enum

from langchain_openai import ChatOpenAI

from app.config import settings

# 供应商连接配置
_VOLCENGINE = (lambda: settings.volcengine_api_key, lambda: settings.volcengine_base_url)
_CARDIAC = (lambda: settings.cardiacBrder_api_key, lambda: settings.cardiacBrder_base_url)


class LLM(Enum):
    """所有可用模型，每个枚举值 = (模型名, api_key函数, base_url函数)"""

    # 火山引擎
    DOUBAO_PRO_256K = ("doubao-pro-256k", *_VOLCENGINE)
    DOUBAO_PRO_32K = ("doubao-pro-32k", *_VOLCENGINE)
    DOUBAO_LITE_128K = ("doubao-lite-128k", *_VOLCENGINE)
    DEEPSEEK_V3 = ("deepseek-v3-250324", *_VOLCENGINE)
    DEEPSEEK_R1 = ("deepseek-r1-250528", *_VOLCENGINE)
    DOUBAO_SEED_LIST = ("doubao-seed-2-0-lite-260215", *_VOLCENGINE)
    DOUBAO_SEED_PRO = ("doubao-seed-2-0-pro-260215", *_VOLCENGINE)

    # 心缘
    GPT_4O = ("gpt-4o", *_CARDIAC)
    GPT_4O_MINI = ("gpt-4o-mini", *_CARDIAC)
    CLAUDE_SONNET_4 = ("claude-sonnet-4-20250514", *_CARDIAC)

    def __init__(self, model_name: str, api_key_fn, base_url_fn):
        self.model_name = model_name
        self._api_key_fn = api_key_fn
        self._base_url_fn = base_url_fn

    def create(self, **kwargs) -> ChatOpenAI:
        """创建 LLM 实例，kwargs 透传给 ChatOpenAI（temperature, max_tokens 等）"""
        return ChatOpenAI(
            model=self.model_name,
            api_key=self._api_key_fn(),
            base_url=self._base_url_fn(),
            **kwargs,
        )