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_schema import LoanStatusSchema
from app.api.services.base_service import BaseService
from app.api.enums import TransactionType   
from app.extensions import db  


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')
                customer = Customer.get_customer(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 jsonify({
                            "message": "Failed to log transaction."
                        }), 400
                else: 
                    return jsonify({
                            "message": "Invalid Customer or Account"
                        }), 400
        

                # loans = [
                #     {
                #         "debtId": "123456789",
                #         "loanDate": "2019-10-18 14:26:21.063",
                #         "dueDate": "2019-11-20 14:26:21.063",
                #         "currentLoanAmount": 8500,
                #         "initialLoanAmount": 10000,
                #         "defaultPenaltyFee": 0,
                #         "continuousFee": 0,
                #         "productId": "101"
                #     }
                # ]

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

                # Simulated processing logic
                response_data = {
                    "customerId": customer_id,
                    "transactionId": transactionId,
                    "loans": loans,
                    "totalDebtAmount": total_debt_amount,
                    "resultCode": "00",
                    "resultDescription": "Successful"
                }

                db.session.commit()
                return response_data

        except ValidationError as err:

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

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

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

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