from flask import request, jsonify
from marshmallow import ValidationError
from app.utils.logger import logger
from app.api.schemas.select_offer import SelectOfferSchema, SelectOfferResponseSchema

class SelectOfferService:
    @staticmethod
    def process_request(data):
        """
        Process the SelectOffer request.

        Args:
            data (dict): The request data.

        Returns:
            dict: A standardized response.
        """
        try:
            logger.info("Processing SelectOffer request")

            # Validate input data using SelectOfferSchema
            schema = SelectOfferSchema()
            validated_data = schema.load(data)  # Raises ValidationError if invalid

            # Simulated processing logic
            # In a real implementation, this would interact with your business logic
            # to determine eligible loan offers based on the requested amount and product
            response_data = {
                "requestId": validated_data.get('requestId'),
                "transactionId": validated_data.get('transactionId'),
                "customerId": validated_data.get('customerId'),
                "accountId": validated_data.get('accountId'),
                "outstandingDebtAmount": 0,
                "loan": [
                    {
                        "offerId": "14451",
                        "productId": "2030",
                        "amount": validated_data.get('requestedAmount'),
                        "upfrontPayment": validated_data.get('requestedAmount') * 0.1,  # 10% upfront
                        "interestRate": 3.0,
                        "Interest": validated_data.get('requestedAmount') * 0.03,  # 3% interest
                        "ManagementRate": 1.0,
                        "ManagementFee": validated_data.get('requestedAmount') * 0.01,  # 1% management fee
                        "InsuranceRate": 1.0,
                        "InsuranceFee": validated_data.get('requestedAmount') * 0.01,  # 1% insurance
                        "VATRate": 7.5,
                        "VATamount": (validated_data.get('requestedAmount') * 0.01) * 0.075,  # 7.5% VAT on management fee
                        "recommendedRepaymentDates": ["2023-12-30"],  # Example date
                        "installmentAmount": validated_data.get('requestedAmount') * 1.1,  # Principal + 10% fees
                        "totalRepaymentAmount": validated_data.get('requestedAmount') * 1.1  # Principal + 10% fees
                    }
                ],
                "resultCode": "00",
                "resultDescription": "Successful"
            }

            # Validate the response using the response schema
            response_schema = SelectOfferResponseSchema()
            validated_response = response_schema.dump(response_data)

            return jsonify(validated_response)

        except ValidationError as err:
            logger.error(f"Validation Error: {err.messages}")
            return jsonify({
                "resultCode": "01",
                "resultDescription": f"Validation error: {err.messages}"
            }), 422

        except Exception as e:
            logger.error(f"An error occurred: {str(e)}", exc_info=True)
            return jsonify({
                "resultCode": "08",
                "resultDescription": f"Error occurred: {str(e)}"
            }), 500