from flask import request, jsonify
from marshmallow import ValidationError
from app.api.services.base_service import BaseService
from app.api.enums import TransactionType
from app.utils.logger import logger
from app.api.schemas.select_offer import SelectOfferSchema
from app.extensions import db


class SelectOfferService(BaseService):
    TRANSACTION_TYPE = TransactionType.SELECT_OFFER

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

        Args:
            data (dict): The request data.

        Returns:
            dict: A standardized response.
        """
        try:
            with db.session.begin():
                validated_data = SelectOfferService.validate_data(
                    data, SelectOfferSchema()
                )
                account_id = validated_data.get("accountId")
                customer_id = validated_data.get("customerId")

                if SelectOfferService.validate_account_ownership(
                    account_id=account_id, customer_id=customer_id
                ):
                    transaction = SelectOfferService.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

                offers = [
                    {
                        "offerId": "14451",
                        "productId": "2030",
                        "amount": 10000.0,
                        "upfrontPayment": 1000.0,
                        "interestRate": 3.0,
                        "managementRate": 1.0,
                        "managementFee": 1.0,
                        "insuranceRate": 1.0,
                        "insuranceFee": 100.0,
                        "VATRate": 7.5,
                        "VATAmount": 100.0,
                        "recommendedRepaymentDates": ["2022-11-30"],
                        "installmentAmount": 11000.0,
                        "totalRepaymentAmount": 11000.0,
                    }
                ]

                # Business logic - selecting an offer
                response_data = {
                    "outstandingDebtAmount": 0,
                    "requestId": "202111170001371256908",
                    "transactionId": transaction.id,
                    "customerId": customer_id,
                    "accountId": account_id,
                    "loan": offers,
                    "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