from flask import request, jsonify
from marshmallow import ValidationError
from app.api.enums.loan_status import LoanStatus
from app.models import Customer
from app.utils.logger import logger
from app.api.schemas.loan_status import LoanStatusSchema 
from app.api.services.base_service import BaseService
from app.api.enums import TransactionType   
from app.extensions import db
from app.api.helpers.response_helper import ResponseHelper


class LoanStatusService(BaseService):
    TRANSACTION_TYPE = TransactionType.LOAN_STATUS 

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

        Args:
            data (dict): The request data.

        Returns:
            dict: A standardized response.
        """
        try:
            with db.session.begin():
                # Validate data
                validated_data = LoanStatusService.validate_data(data, LoanStatusSchema())

                customer_id =  validated_data.get('customerId')

                logger.info(f"Looking for customer *** {customer_id}")
                customer = Customer.get_customer_with_loan_list(customer_id)
                
                transactionId = validated_data.get('transactionId')
                account_id = validated_data.get('accountId')

                if(LoanStatusService.validate_account_ownership(account_id = account_id, customer_id = customer_id)):
                    # Get loans
                    loans = [loan.to_dict() for loan in customer.loans if loan.status == LoanStatus.ACTIVE]
                    transaction = LoanStatusService.log_transaction(validated_data = validated_data)
                    if not transaction:
                        logger.error(f"Failed to log transaction")
                        return ResponseHelper.error(result_description="Failed to log transaction.")
                else:  
                    return ResponseHelper.error(result_description="Invalid Customer or Account")

                total_debt_amount = sum(
                    loan.get("currentLoanAmount") or 0
                    for loan in loans
                    )

                # Simulated processing logic
                response_data = {
                    "customerId": customer_id,
                    "accountId": account_id,
                    "transactionId": transactionId,
                    "loans": loans,
                    "totalDebtAmount": total_debt_amount,
                }

                db.session.commit()
                return ResponseHelper.success(data=response_data)

        except ValidationError as err:

            logger.error(f"Validation Error: {getattr(err, 'messages', str(err))}")
            db.session.rollback()
            return ResponseHelper.unprocessable_entity(result_description="Validation exception")
        
        except  ValueError as err:
            logger.error(f"{getattr(err, 'messages', str(err))}")
            db.session.rollback()
            return ResponseHelper.error(result_description=str(err))

        except Exception as e:
            logger.error(f"An error occurred: {str(e)}", exc_info=True)
            db.session.rollback()
            return ResponseHelper.internal_server_error()