import io
from functions import *
from PyPDF2 import PdfReader
from fastapi import FastAPI, File, UploadFile
from fastapi.middleware.cors import CORSMiddleware
from langchain_community.document_loaders import UnstructuredURLLoader


app = FastAPI(title = "ConversAI", root_path = "/api/v1")
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

@app.post("/signup")
async def signup(username: str, password: str):
    response = createUser(username = username, password = password)
    return response


@app.post("/login")
async def login(username: str, password: str):
    response = matchPassword(username = username, password = password)
    return response


@app.post("/newChatbot")
async def newChatbot(chatbotName: str, username: str):
    chatbotName = f"convai-{username}-{chatbotName}"
    return createTable(tablename = chatbotName)


@app.post("/addPDF")
async def addPDFData(vectorstore: str, pdf: UploadFile = File(...)):
    pdf = await pdf.read()
    reader = PdfReader(io.BytesIO(pdf))
    text = ""
    for page in reader.pages:
        text += page.extract_text()
    return addDocuments(text = text, vectorstore = vectorstore)


@app.post("/addText")
async def addText(vectorstore: str, text: str):
    return addDocuments(text = text, vectorstore = vectorstore)


@app.post("/addWebsite")
async def addWebsite(vectorstore: str, websiteUrl: str):
    urls = getLinks(websiteUrl)
    loader = UnstructuredURLLoader(urls=urls)
    docs = loader.load()
    text = "\n\n\n\n".join([f"Metadata:\n{docs[doc].metadata} \nPage Content:\n {docs[doc].page_content}" for doc in range(len(docs))])
    return addDocuments(text = text, vectorstore = vectorstore)


@app.post("/answerQuery")
async def answerQuestion(query: str, vectorstore: str, llmModel: str = "llama3-70b-8192"):
    return answerQuery(query=query, vectorstore=vectorstore, llmModel=llmModel)


@app.post("/deleteChatbot")
async def delete(chatbotName: str):
    return deleteTable(tableName=chatbotName)

@app.post("/listChatbots")
async def delete(username: str):
    return listTables(username=username)