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import os
import shutil
import tempfile
from tempfile import NamedTemporaryFile
from pathlib import Path

from fastapi import FastAPI, UploadFile
from fastapi.middleware import Middleware
from fastapi.middleware.cors import CORSMiddleware
from .rag import ChatPDF

middleware = [
    Middleware(
        CORSMiddleware,
        allow_origins=["*"],
        allow_methods=['*'],
        allow_headers=['*']
    )
]

app = FastAPI(middleware=middleware)

files_dir = os.path.expanduser("~/wtp_be_files/")
session_assistant = ChatPDF()
# session_messages = []

@app.get("/query")
def process_input(text: str):
    if text and len(text.strip()) > 0:
        text = text.strip()
        print("PRINTING STREAM")
        agent_text_stream = session_assistant.ask(text)
        print(agent_text_stream)
        for text in agent_text_stream:
            print(text)
        # session_messages.append((text, True))
        # session_messages.append((agent_text, False))
        return "Query resolved!"


@app.post("/upload")
def upload(files: list[UploadFile]):
    session_assistant.clear()
    # session_messages = []
    
    try:
        os.makedirs(files_dir)
        for file in files:
            try:
                path = f"{files_dir}/{file.filename}"
                file.file.seek(0)
                with open(path, 'wb') as destination:
                    shutil.copyfileobj(file.file, destination)
            finally:
                file.file.close()
    finally:
        session_assistant.ingest(files_dir)
        shutil.rmtree(files_dir)

    return "Files inserted!"


@app.get("/")
def ping():
    return "Pong!"