main.py

from fastapi import FastAPI, Depends , Request,WebSocket
import requests
import base64
import logging
import time
import asyncio
import PyPDF2
from docx import Document
from PIL import Image
import pytesseract
import io
from bs4 import BeautifulSoup
import re
from get_gmail_data import GmailDataExtractor
from dotenv import load_dotenv
import os

app = FastAPI()
load_dotenv()


GOOGLE_CLIENT_ID = os.getenv('GOOGLE_CLIENT_ID')
GOOGLE_CLIENT_SECRET =os.getenv('GOOGLE_CLIENT_SECRET')
GOOGLE_REDIRECT_URI = os.getenv('GOOGLE_REDIRECT_URI')
GOOGLE_REDIRECT_URI_2= "https://omkar008-receipt-radar-test.hf.space/test"
# Configure the logger
logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger(__name__)

@app.post("/getReceiptData")
async def get_gmail_data(request:Request):
    body = await request.json()
    access_token = body.get("data")
    user_input = None 
    data = GmailDataExtractor(access_token,user_input).extract_messages()
    
    # print(data.error)
    # print(data.json())
    return data


@app.get("/")
async def login_google():
    # oauth_url = f"https://accounts.google.com/o/oauth2/auth?response_type=code&client_id={GOOGLE_CLIENT_ID}&redirect_uri={GOOGLE_REDIRECT_URI}&scope=openid%20profile%20email&access_type=offline"
    
    #Below is the URL to prompt the user to login to his specified gmail account and also give a readonly access to his gmail
    oauth_url_hr = f"https://accounts.google.com/o/oauth2/auth?response_type=code&client_id={GOOGLE_CLIENT_ID}&redirect_uri={GOOGLE_REDIRECT_URI_2}&scope=openid%20profile%20email%20https://www.googleapis.com/auth/gmail.readonly&access_type=offline"
    return {
        "url_hr": oauth_url_hr
    }


@app.get("/test")
async def test_google(code:str):

    # token_url = "https://accounts.google.com/o/oauth2/token"
    print("Printing authorisation token")
    print(code)
    token_url="https://oauth2.googleapis.com/token"
    data = {
        "code": code,
        "client_id": GOOGLE_CLIENT_ID,
        "client_secret": GOOGLE_CLIENT_SECRET,
        "redirect_uri": GOOGLE_REDIRECT_URI,
        "grant_type": "authorization_code",
        "access_type": "offline"
    }
    response = requests.post(token_url, data=data)
    
    access_token = response.json().get("access_token")
    print("printing access token , yo yo test")
    print(access_token)
    return {"access_token":response.json()}
    # # if not access_token:
    # #     raise HTTPException(status_code=400, detail="Authorization code not provided")
    # print("Entered this function, for testing purposes")
    # brand_name = "louis vuitton"

    # user_info = requests.get("https://www.googleapis.com/oauth2/v1/userinfo", headers={"Authorization": f"Bearer {access_token}"})
    # page_token = None
    # messages = []
    # # user_query = f"subject:((receipt {brand_name}) OR (receipts {brand_name})  OR (reçu {brand_name}) OR (reçus {brand_name}) OR (Quittung {brand_name}) OR (Quittungen {brand_name}) OR (aankoopbon {brand_name}) OR (aankoopbonnen {brand_name}) OR (recibo {brand_name}) OR (recibos {brand_name}) OR (ricevuta {brand_name}) OR (ricevute {brand_name}) OR (ontvangstbewijs {brand_name}) OR (ontvangstbewijzen {brand_name})) has:attachment"
    # # user_query = f"{brand_name} label:^smartlabel_receipt"
    # user_query = f"(label:^smartlabel_receipt OR (subject:your AND subject:order) OR subject:receipts OR subject:receipt OR subject:invoice OR subject:invoice)) AND subject:amazon"
    # # user_query = """("invoice" OR (("tracking" OR "track") AND ("delivery" OR "package"))) OR (subject:order OR subject:receipt OR subject:receipts OR subject:invoice OR subject:invoice)"""
    # while True:
    #     # Construct Gmail API request with pageToken
        
    #     gmail_url = f"https://www.googleapis.com/gmail/v1/users/me/messages?q={user_query}"
    #     if page_token:
    #         gmail_url += f"&pageToken={page_token}"

    #     gmail_response = requests.get(gmail_url, headers={"Authorization": f"Bearer {access_token}"})
    #     gmail_data = gmail_response.json()
        
    #     # Check if there are messages in the response
    #     if "messages" in gmail_data:
    #         messages.extend(gmail_data["messages"])

    #     # Check if there are more pages
    #     if "nextPageToken" in gmail_data:
    #         page_token = gmail_data["nextPageToken"]
    #     else:
    #         break  # No more pages, exit the loop

    # unique_thread_ids = set()

    # filtered_data_list = []

    # for entry in messages:
    #     thread_id = entry['threadId']
    #     if thread_id not in unique_thread_ids:
    #         unique_thread_ids.add(thread_id)
    #         filtered_data_list.append(entry)

    # attachments = []
    # attachment_no = 0
    # data_new = {}
    # for i,message in enumerate(messages) :
    #     # print(i)
    #     # print(message)

    #     if message:
    #         message_id = message.get("id")
    #         print(message_id)
    #         if message_id:
    #             message_url = f"https://www.googleapis.com/gmail/v1/users/me/messages/{message_id}"
    #             message_response = requests.get(message_url, headers={"Authorization": f"Bearer {access_token}"})
    #             message_data = message_response.json()
    #             print("printing message_data response json")
    #             print(message_data)
    #             print("Finished printing message_data response json")

    #             subject = ''
    #             body = ''
    #             print("printing body")
    #             print(message_data['snippet'])
    #             if 'payload' in message_data and 'headers' in message_data['payload']:
    #                 headers = message_data['payload']['headers']
    #                 for header in headers:
    #                     if header['name'] == 'Subject':
    #                         subject = header['value']
                    
    #                 if 'parts' in message_data['payload']:
    #                     parts = message_data['payload']['parts']
    #                     print("printing parts")
    #                     print(parts)

    #                     for part in parts:
    #                         if part['mimeType'] == 'text/plain' or part['mimeType'] == 'text/html':
    #                             body_data = part['body']['data']
    #                             print("printing body data")
    #                             print(body_data)
    #                             body = base64.urlsafe_b64decode(body_data)
    #             print("Subject:", subject)
    #             if body:
    #                 text,links=extract_text_and_links(body)
    #                 if text:
    #                     print("Printing extracted Text: ")
    #                     print(text)
    #                 else:
    #                     print("No text found or there was some error parsing.")

    #             if links:
    #                 print("\nLinks:")
    #                 for link_text, link_url in links:
    #                     print(f"{link_text}: {link_url}")
    #             else:
    #                 print("No links found or there was some error in parsing or maybe don't use for loop.")
                    
                
    #             # Check for parts in the message payload
    #             if "payload" in message_data and "parts" in message_data["payload"]:
    #                 for part in message_data["payload"]["parts"]:
    #                     if "body" in part and "attachmentId" in part["body"]:
    #                         attachment_id = part["body"]["attachmentId"]
    #                         attachment_url = f"https://www.googleapis.com/gmail/v1/users/me/messages/{message_id}/attachments/{attachment_id}"
    #                         attachment_response = requests.get(attachment_url, headers={"Authorization": f"Bearer {access_token}"})
    #                         attachment_data = attachment_response.json()
    #                         data = attachment_data.get("data")
    #                         filename = part.get("filename", "untitled.txt")

    #                         if data:
    #                             data_new[filename]=data[:10]
    #                             # attachment_content = base64.urlsafe_b64decode(data)
    #                             # extracted_text = await extract_text_from_attachment(filename, attachment_content)

    #                             attachment_no+=1

    # return {"attachment_count":attachment_no,"attachment_content":data_new}


def extract_text_and_links(html_content):
    soup = BeautifulSoup(html_content, 'html.parser')
    
    # Extract text
    text = soup.get_text()
    text = re.sub(r'\s+', ' ', text).strip()
    # Extract links
    links = []
    for link in soup.find_all('a', href=True):
        links.append((link.text, link['href']))
    
    return text, links


@app.post("/auth/google")
async def auth_google(request: Request):

    data = await request.json()
    code = data.get("access_token")
    brand_name = data.get("brand_name")
    print("Printing the access token")
    print(code)
    if not code:
        raise HTTPException(status_code=400, detail="Authorization code not provided")
    access_token_new = code

    user_info = requests.get("https://www.googleapis.com/oauth2/v1/userinfo", headers={"Authorization": f"Bearer {access_token_new}"})
    page_token = None
    messages = []
    user_query = f"subject:((receipt {brand_name}) OR (receipts {brand_name})  OR (reçu {brand_name}) OR (reçus {brand_name}) OR (Quittung {brand_name}) OR (Quittungen {brand_name}) OR (aankoopbon {brand_name}) OR (aankoopbonnen {brand_name}) OR (recibo {brand_name}) OR (recibos {brand_name}) OR (ricevuta {brand_name}) OR (ricevute {brand_name}) OR (ontvangstbewijs {brand_name}) OR (ontvangstbewijzen {brand_name})) has:attachment"
    # user_query = f"{brand_name} label:^smartlabel_receipt"

    while True:
        # Construct Gmail API request with pageToken
        gmail_url = f"https://www.googleapis.com/gmail/v1/users/me/messages?q={user_query}"
        if page_token:
            gmail_url += f"&pageToken={page_token}"

        gmail_response = requests.get(gmail_url, headers={"Authorization": f"Bearer {access_token_new}"})
        gmail_data = gmail_response.json()
        
        # Check if there are messages in the response
        if "messages" in gmail_data:
            messages.extend(gmail_data["messages"])

        # Check if there are more pages
        if "nextPageToken" in gmail_data:
            page_token = gmail_data["nextPageToken"]
        else:
            break  # No more pages, exit the loop

    attachments = []
    attachment_no = 0
    data_new = {}
    for i,message in enumerate(messages) :
        # print(i)
        # print(message)

        if message:
            message_id = message.get("id")
            print(message_id)
            if message_id:
                message_url = f"https://www.googleapis.com/gmail/v1/users/me/messages/{message_id}"
                message_response = requests.get(message_url, headers={"Authorization": f"Bearer {access_token_new}"})
                message_data = message_response.json()


                if "payload" in message_data:
                    payload = message_data["payload"]
                    if "body" in payload and "data" in payload["body"]:
                        body_data = payload["body"]["data"]
                        body_content = base64.urlsafe_b64decode(body_data.encode("UTF-8")).decode("UTF-8")
                        print("Body Content:")
                        print(body_content)

                # Check for parts in the message payload
                if "payload" in message_data and "parts" in message_data["payload"]:
                    for part in message_data["payload"]["parts"]:
                        if "body" in part and "attachmentId" in part["body"]:
                            attachment_id = part["body"]["attachmentId"]
                            attachment_url = f"https://www.googleapis.com/gmail/v1/users/me/messages/{message_id}/attachments/{attachment_id}"
                            attachment_response = requests.get(attachment_url, headers={"Authorization": f"Bearer {access_token_new}"})
                            attachment_data = attachment_response.json()
                            data = attachment_data.get("data")
                            filename = part.get("filename", "untitled.txt")

                            if data:
                                data_new[filename]=data
                                attachment_content = base64.urlsafe_b64decode(data)
                                extracted_text = await extract_text_from_attachment(filename, attachment_content)

                                attachment_no+=1

    return {"attachment_count":attachment_no,"attachment_content":data_new}


async def send_chunked_data(websocket: WebSocket, filename: str, data: str):
    chunk_size = 1024  # Set an appropriate chunk size
    for i in range(0, len(data), chunk_size):
        await websocket.send_json({"filename": filename, "data_chunk": data[i:i + chunk_size]})
        await asyncio.sleep(0.4)
    await websocket.send_text("FinishedThisAttachment")


async def extract_text_from_pdf(pdf_data):
    with io.BytesIO(pdf_data) as pdf_file:
        pdf_reader = PyPDF2.PdfReader(pdf_file)
        text = ""
        for page_num in range(len(pdf_reader.pages)):
            page = pdf_reader.pages[page_num]
            text += page.extract_text()
        return text

async def extract_text_from_docx(docx_data):
    doc = Document(io.BytesIO(docx_data))
    text = ""
    for para in doc.paragraphs:
        text += para.text + "\n"
    return text

async def extract_text_from_attachment(filename, data):
    if filename.endswith('.pdf'):
        return await extract_text_from_pdf(data)
    elif filename.endswith('.docx'):
        return await extract_text_from_docx(data)
    else:
        # Add handling for other document types if needed
        return "Unsupported document type"



@app.websocket("/ws")
async def test_websocket(websocket: WebSocket):
    await websocket.accept()
    logger.info("Hi hi succefull in connecting !!")

    data = await websocket.receive_text()
    logger.info("Received JSON data: %s", data)


    
    def get_messages(code:str):
  
        logging.info("entered into the get_messages")
        access_token = code
        print("printing access_token")
        print(access_token)
        page_token = None
        messages = []
        jobs_query = "subject:receipt OR subject:receipts has:attachment"

        while True:
            # Construct Gmail API request with pageToken
            print("into the gmail")
            gmail_url = f"https://www.googleapis.com/gmail/v1/users/me/messages?q={jobs_query}"

            if page_token:
                gmail_url += f"&pageToken={page_token}"

            gmail_response = requests.get(gmail_url, headers={"Authorization": f"Bearer {access_token}"})
            logging.info(f"{gmail_response}")
            print(gmail_response)
            gmail_data = gmail_response.json()
            
            # Check if there are messages in the response
            if "messages" in gmail_data:
                messages.extend(gmail_data["messages"])

            # Check if there are more pages
            if "nextPageToken" in gmail_data:
                page_token = gmail_data["nextPageToken"]
            else:
                break  # No more pages, exit the loop
        print("returning the messages")

        unique_thread_ids = set()

        filtered_data_list = []

        for entry in messages:
            thread_id = entry['threadId']
            if thread_id not in unique_thread_ids:
                unique_thread_ids.add(thread_id)
                filtered_data_list.append(entry)
        

        return filtered_data_list
    
    async def event_generator(code:str):
        
        logging.info("entered into the event_generator")

        access_token = code
        messages=get_messages(access_token)
        print(len(messages))
        await websocket.send_json({"total_messages":len(messages)})
        await websocket.send_text("CompletedSendingTotalMessagesLength")
        attachments = []
        prev_data=""
        data_new={}
        attachment_no=0
        batch_size = 5
        prev_filename = None

        for i,message in enumerate(messages) :
            print(i)
            logging.info(f"{i}")
            logging.info(f"{message}")

            print(message)

            if message:
                message_id = message.get("id")
                thread_id = message.get("threadId")
                print(message_id)
                if message_id:
                    message_url = f"https://www.googleapis.com/gmail/v1/users/me/messages/{message_id}"
                    message_response = requests.get(message_url, headers={"Authorization": f"Bearer {access_token}"})
                    message_data = message_response.json()

                    
                    # Check for parts in the message payload
                    if "payload" in message_data and "parts" in message_data["payload"]:
                        for part in message_data["payload"]["parts"]:
                            if "body" in part and "attachmentId" in part["body"]:
                                attachment_id = part["body"]["attachmentId"]
                                print(attachment_id)
                                attachment_url = f"https://www.googleapis.com/gmail/v1/users/me/messages/{message_id}/attachments/{attachment_id}"
                                attachment_response = requests.get(attachment_url, headers={"Authorization": f"Bearer {access_token}"})
                                attachment_data = attachment_response.json()
                                data = attachment_data.get("data",{})
                                filename = part.get("filename", "untitled.txt")
                                if data:
                                    data_new[filename]=str(data[:10])
                                    attachment_content = base64.urlsafe_b64decode(data)
                                    logging.info(filename)
                                    extracted_text = await extract_text_from_attachment(filename, attachment_content)
                                    logging.info(extracted_text)
                                    await send_chunked_data(websocket, filename, data)

                                    attachment_no+=1

        await websocket.send_text("CompletedFetchingMessages")

    await event_generator(data)
    logging.info("Closing connection")
    await websocket.close()