import asyncio
import logging
from contextlib import asynccontextmanager
from logging.handlers import RotatingFileHandler

import uvicorn
from fastapi import FastAPI, UploadFile, File, Request
from sse_starlette.sse import EventSourceResponse
from elasticsearch import Elasticsearch
from openai import OpenAI

from Dao.KbDao import KbDao
from Util.MySQLUtil import init_mysql_pool
from Config import Config
from fastapi.staticfiles import StaticFiles

# 初始化日志
logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)
handler = RotatingFileHandler('Logs/start.log', maxBytes=1024*1024, backupCount=5)
handler.setFormatter(logging.Formatter('%(asctime)s - %(levelname)s - %(message)s'))
logger.addHandler(handler)

@asynccontextmanager
async def lifespan(app: FastAPI):
    # 初始化数据库连接池
    app.state.kb_dao = KbDao(await init_mysql_pool())
    
    # 初始化ES连接
    import urllib3
    urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
    
    # 初始化ES连接时添加verify_certs=False
    app.state.es = Elasticsearch(
        hosts=Config.ES_CONFIG['hosts'],
        basic_auth=Config.ES_CONFIG['basic_auth'],
        verify_certs=False  # 禁用证书验证
    )
    
    # 初始化DeepSeek客户端
    app.state.deepseek_client = OpenAI(
        api_key=Config.DEEPSEEK_API_KEY,
        base_url=Config.DEEPSEEK_URL
    )
    yield
    # 关闭数据库连接池
    await app.state.kb_dao.mysql_pool.close()

app = FastAPI(lifespan=lifespan)

# 知识库CRUD接口
@app.get("/kb")
async def list_kbs():
    """获取所有知识库列表"""
    return await app.state.kb_dao.list_kbs()

@app.post("/kb")
async def create_kb(kb: dict):
    """创建知识库"""
    return await app.state.kb_dao.create_kb(kb)

@app.get("/kb/{kb_id}")
async def read_kb(kb_id: int):
    """获取知识库详情"""
    return await app.state.kb_dao.get_kb(kb_id)

@app.post("/kb/update/{kb_id}")
async def update_kb(kb_id: int, kb: dict):
    """更新知识库信息"""
    return await app.state.kb_dao.update_kb(kb_id, kb)

@app.delete("/kb/{kb_id}")
async def delete_kb(kb_id: int):
    """删除知识库"""
    return await app.state.kb_dao.delete_kb(kb_id)

# 知识库文件CRUD接口
@app.post("/kb_file")
async def create_kb_file(file: dict):
    """创建知识库文件记录"""
    return await app.state.kb_dao.create_kb_file(file)

@app.get("/kb_files/{file_id}")
async def read_kb_file(file_id: int):
    """获取文件详情"""
    return await app.state.kb_dao.get_kb_file(file_id)

@app.post("/kb_files/update/{file_id}")
async def update_kb_file(file_id: int, file: dict):
    """更新文件信息"""
    return await app.state.kb_dao.update_kb_file(file_id, file)

@app.delete("/kb_files/{file_id}")
async def delete_kb_file(file_id: int):
    """删除文件记录"""
    return await app.state.kb_dao.delete_kb_file(file_id)

# 文件上传接口
@app.post("/upload")
async def upload_file(kb_id: int, file: UploadFile = File(...)):
    """文件上传接口"""
    return await app.state.kb_dao.handle_upload(kb_id, file)

def search_related_data(es, query):
    """搜索与查询相关的数据"""
    # 向量搜索
    vector_results = es.search(
        index=Config.ES_CONFIG['default_index'],
        body={
            "query": {
                "match": {
                    "content": {
                        "query": query,
                        "analyzer": "ik_smart"
                    }
                }
            },
            "size": 5
        }
    )
    
    # 文本精确搜索
    text_results = es.search(
        index="raw_texts",
        body={
            "query": {
                "match": {
                    "text.keyword": query
                }
            },
            "size": 5
        }
    )
    
    # 合并结果
    context = ""
    for hit in vector_results['hits']['hits']:
        context += f"向量相似度结果(score={hit['_score']}):\n{hit['_source']['text']}\n\n"
    
    for hit in text_results['hits']['hits']:
        context += f"文本精确匹配结果(score={hit['_score']}):\n{hit['_source']['text']}\n\n"
    
    return context

async def generate_stream(client, es, query):
    """生成SSE流"""
    context = search_related_data(es, query)
    
    prompt = f"""根据以下关于'{query}'的相关信息，整理一份结构化的报告：
要求：
1. 分章节组织内容
2. 包含关键数据和事实
3. 语言简洁专业

相关信息：
{context}"""
    
    try:
        response = client.chat.completions.create(
            model="deepseek-chat",
            messages=[
                {"role": "system", "content": "你是一个专业的文档整理助手"},
                {"role": "user", "content": prompt}
            ],
            temperature=0.3,
            stream=True
        )
        
        for chunk in response:
            if chunk.choices[0].delta.content:
                yield {"data": chunk.choices[0].delta.content}
            await asyncio.sleep(0.01)
    except Exception as e:
        yield {"data": f"生成报告时出错: {str(e)}"}

@app.get("/api/rag")
async def rag_stream(query: str, request: Request):
    """RAG+DeepSeek流式接口"""
    return EventSourceResponse(
        generate_stream(request.app.state.deepseek_client, request.app.state.es, query)
    )

app.mount("/static", StaticFiles(directory="Static"), name="static")

if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=8000)