import requests
import uvicorn
from fastapi import FastAPI, WebSocket
import base64
import datetime
import hashlib
import hmac
import json
from urllib.parse import urlparse
from datetime import datetime
from time import mktime
from urllib.parse import urlencode
from wsgiref.handlers import format_date_time

import websockets

app = FastAPI()
Spark_url = {
    "v1.1": "wss://spark-api.xf-yun.com/v1.1/chat",
    "v2.1": "wss://spark-api.xf-yun.com/v2.1/chat",
    "v3.1": "wss://spark-api.xf-yun.com/v3.1/chat"
}
text = []


class Ws_Param(object):
    # 初始化
    def __init__(self, APPID, APIKey, APISecret, Spark_url):
        self.APPID = APPID
        self.APIKey = APIKey
        self.APISecret = APISecret
        self.host = urlparse(Spark_url).netloc
        self.path = urlparse(Spark_url).path
        self.Spark_url = Spark_url

    # 生成url
    def create_url(self):
        # 生成RFC1123格式的时间戳
        now = datetime.now()
        date = format_date_time(mktime(now.timetuple()))

        # 拼接字符串
        signature_origin = "host: " + self.host + "\n"
        signature_origin += "date: " + date + "\n"
        signature_origin += "GET " + self.path + " HTTP/1.1"

        # 进行hmac-sha256进行加密
        signature_sha = hmac.new(self.APISecret.encode('utf-8'), signature_origin.encode('utf-8'),
                                 digestmod=hashlib.sha256).digest()

        signature_sha_base64 = base64.b64encode(signature_sha).decode(encoding='utf-8')

        authorization_origin = f'api_key="{self.APIKey}", algorithm="hmac-sha256", headers="host date request-line", signature="{signature_sha_base64}"'

        authorization = base64.b64encode(authorization_origin.encode('utf-8')).decode(encoding='utf-8')

        # 将请求的鉴权参数组合为字典
        v = {
            "authorization": authorization,
            "date": date,
            "host": self.host
        }
        # 拼接鉴权参数，生成url
        url = self.Spark_url + '?' + urlencode(v)
        # 此处打印出建立连接时候的url,参考本demo的时候可取消上方打印的注释，比对相同参数时生成的url与自己代码生成的url是否一致
        return url


def getText(role, content):
    jsoncon = {}
    jsoncon["role"] = role
    jsoncon["content"] = content
    text.append(jsoncon)
    return text


def getlength(text):
    length = 0
    for content in text:
        temp = content["content"]
        leng = len(temp)
        length += leng
    return length


def checklen(text):
    while (getlength(text) >= 8192):
        del text[0]
    return text


def v1wsUrl(version, appid, api_secret, api_key):
    wsParam = Ws_Param(appid, api_key, api_secret, Spark_url[version])
    wsUrl = wsParam.create_url()
    return wsUrl


def get_query(data, knowledge_base_name, score_threshold, top_k):
    content = data["payload"]["message"]["text"][-1]  # 数组最后一个
    query = content["content"]
    q = {
        "knowledge_base_name": knowledge_base_name,
        "query": query,
        "score_threshold": score_threshold,
        "top_k": top_k
    }
    docs = requests.post("http://127.0.0.1:7861/knowledge_base/search_docs", json=q).json()
    if len(docs) <= 0:
        return query
    contexts = [doc['page_content'] for doc in docs]
    wiki_content = "\n".join(contexts)
    prompt = "请将以下内容作为已知信息：\n" + wiki_content + (
        "\n请根据以上内容回答用户的问题。\n问题:\n") + query + "\n回答: "
    return prompt


@app.websocket("/{version}/chat")
async def wsk(ws: WebSocket, version: str):
    try:
        await ws.accept()
        appid = ws.query_params.get("appid")
        api_secret = ws.query_params.get("api_secret")
        api_key = ws.query_params.get("api_key")
        knowledge_base_name = ws.query_params.get("knowledge_base_name") or "threshold"
        score_threshold = ws.query_params.get("score_threshold") or 0.5
        top_k = ws.query_params.get("top_k") or 2
        wsUrl = v1wsUrl(version, appid, api_secret, api_key)
        r = await ws.receive_json()
        r["payload"]["message"]["text"][-1]["content"] = get_query(r, knowledge_base_name, score_threshold, top_k)
        r["payload"]["message"]["text"] = checklen(r["payload"]["message"]["text"])
        try:
            async with websockets.connect(wsUrl) as websocket:
                await websocket.send(json.dumps(r))
                async for message in websocket:
                    data = json.loads(message)
                    await ws.send_text(json.dumps(data, ensure_ascii=False))
                    status = data["payload"]["choices"]["status"]
                    if status == 2:
                        await ws.close()
        except Exception as e:
            await ws.send_text(str(e))
    except Exception as e:
        print(e)
        await ws.close()


if __name__ == '__main__':
    uvicorn.run(app, host="0.0.0.0", port=8005)