categories/__init__.py

from enum import Enum
from typing import Union

# from . import vendor
from langchain.chains import LLMChain
from langchain.chat_models import ChatOpenAI
from langchain.output_parsers import PydanticOutputParser
from langchain.output_parsers.enum import EnumOutputParser
from langchain.prompts import (ChatPromptTemplate, HumanMessagePromptTemplate,
                               SystemMessagePromptTemplate)
from pydantic import BaseModel

from . import accomodation, random_, travel_cab, travel_flight


class Category(Enum):
    ACCOMODATION = "ACCOMODATION"
    TRAVEL_FLIGHT = "TRAVEL_FLIGHT"
    TRAVEL_CAB = "TRAVEL_CAB"
    # VENDOR = "VENDOR"
    RANDOM = "RANDOM"


category_modules = {
    Category.ACCOMODATION: accomodation,
    Category.TRAVEL_FLIGHT: travel_flight,
    Category.TRAVEL_CAB: travel_cab,
    # Category.VENDOR: vendor,
    Category.RANDOM: random_,
}

model = ChatOpenAI(
    temperature=0,
    n=1,
    # max_tokens=300,
    model_kwargs={
        "stop": None,
        "top_p": 1,
        "frequency_penalty": 0,
        "presence_penalty": 0,
    },
)

# Build categorizing chain
system_message_prompt = SystemMessagePromptTemplate.from_template(
    "You are a classifier that, given a bill's text, states what type of bill "
    "category it belongs to: accomodation (bills regarding stays), travel (bills "
    "concerning cab or other land rides), travel (bills concerning flights), random "
    "(bills concerning deliveries from e-commerce websites like amazon etc) bills.\n"
    "You may want to see if there are Room Details, Check-in/Check-out Date for "
    "Accomodation stay; Flight Details, Train Details, Bus Details Cab details for "
    "Travel; Conference Details for Conference organizers; anything else comes under "
    "random category. Your answers must be only the appropriate choice e.g. 'option' and "
    "not 'The given bill belongs to the option category.'\n"
    "{format_instructions}"
)
human_message_prompt = HumanMessagePromptTemplate.from_template("{text}")
chat_prompt = ChatPromptTemplate.from_messages(
    [system_message_prompt, human_message_prompt]
)
category_parser = EnumOutputParser(enum=Category)
categorize_chain = LLMChain(
    llm=model, prompt=chat_prompt, output_parser=category_parser
)


def categorize_text(text: str) -> Category:
    """Categories the text into one of the categories defined in Category by querying
    ChatGPT.

    Args:
        text(str): The text to categorize.

    Returns: The category of the text.
    """
    return categorize_chain.run(
        text=text, format_instructions=category_parser.get_format_instructions()
    )


def run_category_chain(category: Category, text: str) -> Union[BaseModel, None]:
    """Runs the chain for the given category on the given text.

    Args:
        category(Category): The category for which the chain is to be run.
        text(str): The text on which the chain is to be run.

    Returns: The output of the chain.
    """
    output_parser = category_modules[category].output_parser
    try:
        return category_modules[category].chain.run(
            text=text, format_instructions=output_parser.get_format_instructions()
        )
    except Exception as e:
        print("Error in running chain for category", category, ":", e)


if __name__ == "__main__":
    text = """amazonin
we)

Sold By :

Spigen India Pvt. Ltd.

* Rect/Killa Nos. 38//8/2 min, 192//22/1,196//2/1/1,     
37//15/1, 15/2,, Adjacent to Starex School, Village      
- Binola, National Highway -8, Tehsil - Manesar
Gurgaon, Haryana, 122413

IN

PAN No: ABACS5056L
GST Registration No: O6ABACS5056L12Z5

Order Number: 407-5335982-7837125
Order Date: 30.05.2023

Tax Invoice/Bill of Supply/Cash Memo
(Original for Recipient)

Billing Address :

Praveen Bohra

E-303, ParkView City 2, Sector 49, Sohna Road
GURGAON, HARYANA, 122018

IN

State/UT Code: 06

Shipping Address :

Praveen Bohra

Praveen Bohra

E-303, ParkView City 2, Sector 49, Sohna Road
GURGAON, HARYANA, 122018

IN

State/UT Code: 06

Place of supply: HARYANA

Place of delivery: HARYANA

Invoice Number : DEL5-21033
Invoice Details : HR-DEL5-918080915-2324
Invoice Date : 30.05.2023

Description at Tax |Tax /|Tax Total
p y Rate |Type |Amount|Amount

Black) | BO8BHLZHBH ( ACS01744INP )
HSN:39269099

1 |Spigen Liquid Air Back Cover Case for iPhone 12 Mini (TPU | Matte
1846.62] 1 |%846.62| 9% |CGST! %76.19 |%999.00
9% |SGST| %76.19

TOTAL:

Amount in Words:
Nine Hundred Ninety-nine only

Whether tax is payable under reverse charge - No

For Spigen India Pvt. Ltd.:
sSoigenrn

Authorized Signatory

Payment Transaction ID: Date & Time: 30/05/2023, 10:48:43 Invoice Value: Mode of Payment: Credit
2rs9ZEF8BwU9VmWiCc2Us hrs 999.00 Card

*ASSPL-Amazon Seller Services Pvt. Ltd., ARIPL-Amazon Retail India Pvt. Ltd. (only where Amazon Retail India Pvt. Ltd. fulfillment center is co-located)

Customers desirous of availing input GST credit are requested to create a Business account and purchase on Amazon.in/business from Business eligible offers

Please note that this invoice is not a demand for payment

Page 1 of 1"""
    category = categorize_text(text)
    print("Category:", category)

    print("\n\n")
    result = run_category_chain(category, text)
    print(result)