from flask import request, jsonify
from marshmallow import ValidationError
from app.api.enums.loan_status import LoanStatus
from app.models import Repayment
from app.models.loan import Loan
from app.utils.logger import logger
from app.api.schemas.repayment import RepaymentSchema
from app.api.services.base_service import BaseService
from app.api.enums import TransactionType 
from threading import Thread     

class RepaymentService(BaseService):
    TRANSACTION_TYPE = TransactionType.REPAYMENT 

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

        Args:
            data (dict): The request data.

        Returns:
            dict: A standardized response.
        """
        try:
            validated_data = RepaymentService.validate_data(data, RepaymentSchema())
            customer_id =  validated_data.get('customerId')
            customer = RepaymentService.get_or_create_customer(validated_data)
            account = customer.accounts[0]
            validated_data['accountId'] = account.id
            request_id =  validated_data.get('requestId')
            loan_id = validated_data.get('debtId')


            if (RepaymentService.validate_account_ownership(account_id = account.id, customer_id = customer_id)):

                # Save the repayment details  
                repayment = Repayment.create_repayment(
                    customer_id = customer_id,
                    loan_id = loan_id,
                    product_id = validated_data.get('productId')

                )

                if not repayment:
                    logger.error(f"Failed to save repayment details")
                    return jsonify({
                        "message": "Failed to save repayment details."
                    }), 400
                
                #Update Loan status
                Loan.update_status(loan_id = loan_id, status = LoanStatus.REPAID)
                
                transaction = RepaymentService.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

            # Simulated processing logic
            response_data = {
                "customerId": "CN621868",
                "productId": "101",
                "debtId": "273194670",
                "resultCode": "00",
                "resultDescription": "Successful"
            }

            # return ResponseHelper.success(
            #     data=response_data,
            #     message="Repayment processed successfully"
            # )

            # Call Kafka in a background thread
            thread = Thread(target=RepaymentService.async_send_to_kafka, args=(response_data, request_id, "LOAN_REPAYMENT"))
            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