App/Messages/MessagesRoute.py

# App/Messages/Routes.py
from fastapi import APIRouter, HTTPException
from .Model import Message
from .Schema import MessageCreate, MessageResponse
from typing import Optional
import re
from datetime import datetime
from decimal import Decimal
from App.Payments.PaymentsRoutes import create_payment
from App.Payments.Schema import CreatePaymentRequest
from App.Users.Model import User
from App.Payments.Schema import PaymentMethod
from App.Payments.Model import Payment
from App.Plans.Model import Plan
from tortoise.contrib.pydantic import pydantic_model_creator
import traceback
import logging

message_router = APIRouter(tags=["Messages"], prefix="/messages")
logging.basicConfig(level=logging.WARNING)


@message_router.post("/sms_received", response_model=MessageResponse)
async def receive_message(message_data: MessageCreate):
    Message_Pydantic = pydantic_model_creator(Message)
    try:
        # Extract data from the message content using regex
        text = message_data.payload.message
        parsed_data = parse_message_content(text)

        # Validate parsed_data
        if not parsed_data:
            raise HTTPException(
                status_code=400, detail="Failed to parse message content."
            )

        required_keys = ["phone_number", "amount_received", "transaction_id"]
        missing_keys = [key for key in required_keys if key not in parsed_data]
        if missing_keys:
            raise HTTPException(
                status_code=400, detail=f"Missing keys in parsed data: {missing_keys}"
            )

        # Prevent double entry from the SMS gateway app
        message = await Message.get_or_none(message_id=message_data.id)
        if not message:
            # Process Mpesa Payments
            user: User = await User.get_or_none(
                phoneNumber="+" + parsed_data["phone_number"]
            )
            data_plan: Plan = await Plan.get_or_none(
                amount=Decimal(parsed_data["amount_received"])
            )
            payment_details = CreatePaymentRequest(
                user_id=user.id if user else None,
                plan_id=str(data_plan.id) if data_plan else None,
                amount=Decimal(parsed_data["amount_received"]),
                payment_method=PaymentMethod.MPESA,
                transaction_id=parsed_data["transaction_id"],
            )

            # Ensure 'create_payment' is an async function
            payment: Payment = await create_payment(payment_details, internal=True)
            await payment.create_subscription_or_balance()

            # Create a new message record with parsed_data
            message = await Message.create(
                device_id=message_data.deviceId,
                event=message_data.event,
                message_id=message_data.id,
                webhook_id=message_data.webhookId,
                message_content=message_data.payload.message,
                phone_number=message_data.payload.phoneNumber,
                received_at=message_data.payload.receivedAt,
                sim_number=message_data.payload.simNumber,
                parsed_data=parsed_data,
            )

        # Serialize the message
        data = await Message_Pydantic.from_tortoise_orm(message)
        return data

    except Exception as e:
        # Log the full traceback
        traceback_str = "".join(traceback.format_exception(None, e, e.__traceback__))
        logging.error(f"An error occurred: {traceback_str}")

        # Provide a default error message if 'e' is empty
        error_message = str(e) if str(e) else "An unexpected error occurred."
        raise HTTPException(status_code=500, detail=error_message)


def parse_message_content(text: str) -> Optional[dict]:
    # Regular expression to capture the data from the message
    pattern = r"(\w+)\sConfirmed\.You have received Tsh([\d,]+\.\d{2}) from (\d{12}) - ([A-Z ]+) on (\d{1,2}/\d{1,2}/\d{2}) at ([\d:]+ [APM]+).*?balance\sis\sTsh([\d,]+\.\d{2})"

    # Replace non-breaking spaces and other whitespace characters with regular spaces
    text = re.sub(r"\s+", " ", text)

    matches = re.search(pattern, text)
    if matches:
        data = {
            "transaction_id": matches.group(1),
            "amount_received": parse_decimal(matches.group(2)),
            "phone_number": matches.group(3),
            "name": matches.group(4).strip(),
            "date": parse_date(matches.group(5), matches.group(6)),
            "new_balance": parse_decimal(matches.group(7)),
        }
        return data
    else:
        # Return None if the message doesn't match the expected format
        return None


def parse_decimal(amount_str: str) -> float:
    # Remove commas and convert to float
    amount_str = amount_str.replace(",", "")
    return float(Decimal(amount_str))


def parse_date(date_str: str, time_str: str) -> str:
    # Combine date and time strings and parse into ISO format
    datetime_str = f"{date_str} {time_str}"
    try:
        dt = datetime.strptime(datetime_str, "%d/%m/%y %I:%M %p")
        return dt.isoformat()
    except ValueError:
        # Log the error
        logging.error(f"Failed to parse date: {datetime_str}")
        # Return current time as fallback
        return datetime.now().isoformat()