"""
DeepSeek AI 服务
"""
import httpx
import json
from typing import AsyncGenerator
from utils.config import settings
from utils.logger import logger


class DeepSeekService:
    def __init__(self):
        self.api_key = settings.deepseek.api_key
        self.api_url = settings.deepseek.api_url
        self.base_url = f"{self.api_url}/v1"
    
    async def chat(self, messages: list, model: str = "deepseek-chat") -> str:
        """同步聊天"""
        headers = {
            "Authorization": f"Bearer {self.api_key}",
            "Content-Type": "application/json"
        }
        
        data = {
            "model": model,
            "messages": messages,
            "temperature": 0.7
        }
        
        try:
            async with httpx.AsyncClient(timeout=60.0) as client:
                response = await client.post(
                    f"{self.base_url}/chat/completions",
                    headers=headers,
                    json=data
                )
                response.raise_for_status()
                result = response.json()
                return result['choices'][0]['message']['content']
        except Exception as e:
            logger.error(f"DeepSeek API 调用失败: {e}")
            raise
    
    async def stream_chat(self, messages: list, model: str = "deepseek-chat") -> AsyncGenerator[str, None]:
        """流式聊天"""
        headers = {
            "Authorization": f"Bearer {self.api_key}",
            "Content-Type": "application/json"
        }
        
        data = {
            "model": model,
            "messages": messages,
            "temperature": 0.7,
            "stream": True
        }
        
        try:
            async with httpx.AsyncClient(timeout=120.0) as client:
                async with client.stream(
                    "POST",
                    f"{self.base_url}/chat/completions",
                    headers=headers,
                    json=data
                ) as response:
                    response.raise_for_status()
                    async for line in response.aiter_lines():
                        if line.startswith("data: "):
                            data_str = line[6:]
                            if data_str == "[DONE]":
                                break
                            try:
                                data_json = json.loads(data_str)
                                if 'choices' in data_json and len(data_json['choices']) > 0:
                                    delta = data_json['choices'][0].get('delta', {})
                                    content = delta.get('content', '')
                                    if content:
                                        yield content
                            except json.JSONDecodeError:
                                continue
        except Exception as e:
            logger.error(f"DeepSeek 流式 API 调用失败: {e}")
            raise


# 全局实例
deepseek_service = DeepSeekService()