from flask import request, jsonify
from marshmallow import ValidationError
from app.api.integrations.kafka import KafkaIntegration
from app.api.services.base_service import BaseService
from app.api.enums import TransactionType   
from app.utils.logger import logger
from app.api.schemas.provide_loan import ProvideLoanSchema
from threading import Thread
from app.models.loan import Loan
from app.api.enums import LoanStatus

class ProvideLoanService(BaseService):
    TRANSACTION_TYPE = TransactionType.PROVIDE_LOAN 


    @staticmethod
    def process_request(data):
        """
        Process the ProvideLoan request.

        Args:
            data (dict): The request data.

        Returns:
            dict: A standardized response.
        """
        try:
            validated_data = ProvideLoanService.validate_data(data, ProvideLoanSchema())
            account_id = validated_data.get('accountId')
            customer_id =  validated_data.get('customerId')
            request_id =  validated_data.get('requestId')
            transaction_id = validated_data.get('transactionId')

            if (ProvideLoanService.validate_account_ownership(account_id = account_id, customer_id = customer_id)):

                # Save the loan details  
                loan = Loan.create_loan(
                    customer_id=customer_id,
                    account_id=account_id,
                    offer_id=validated_data.get('offerId'),
                    principal_amount=validated_data.get('requestedAmount'),
                    status=LoanStatus.ACTIVE
                )

                if not loan:
                    logger.error(f"Failed to save loan details")
                    return jsonify({
                        "message": "Failed to save loan details."
                    }), 400
                
                # Log Transaction
                transaction = ProvideLoanService.log_transaction(validated_data = validated_data)

                if not transaction:
                    logger.error(f"Failed to log transaction")
                    return jsonify({
                        "message": "Failed to log transaction."
                    }), 400

            
                
            else: 
                return jsonify({
                        "message": "Invalid Customer or Account"
                    }), 400
           
           
            response_data = {
                "requestId": request_id,
                "transactionId": transaction_id,
                "customerId": customer_id,
                "accountId": account_id,
                "msisdn": "3451342",
                "resultCode": "00",
                "resultDescription": "Successful"
                }


            # KafkaIntegration.send_loan_request(loan_data = response_data, request_id = request_id)
            # Call Kafka in a background thread
            thread = Thread(target=ProvideLoanService.async_send_to_kafka, args=(response_data, request_id, "PROCESS_PAYMENT"))
            thread.start()

            return response_data

        except ValidationError as err:

            logger.error(f"Validation Error: {getattr(err, 'messages', str(err))}")

            return jsonify({
                "message": "Validation exception"
                }) , 422
        
        except  ValueError as err:
            logger.error(f"{getattr(err, 'messages', str(err))}")

            return jsonify({
                "message": str(err)
                }) , 400

        except Exception as e:
            logger.error(f"An error occurred: {str(e)}", exc_info=True)
            return jsonify({
                "message": "Internal Server Error"
                }) , 500