from flask import jsonify
from app.utils.logger import logger
from app.api.services.base_service import BaseService
from app.models.loan import Loan
from datetime import datetime


class LoanService(BaseService):
    @staticmethod
    def process_request(filters=None):
        """
        Process the get loans request.

        Args:
            filters (dict, optional): Filters for the loans query.

        Returns:
            dict: A standardized response with loans data.
        """
        try:
            if filters is None:
                filters = {}

            # Extract filters
            customer_id = filters.get('customer_id')
            account_id = filters.get('account_id')
            status = filters.get('status')
            offer_id = filters.get('offer_id')
            product_id = filters.get('product_id')
            start_date = filters.get('start_date')
            end_date = filters.get('end_date')
            due_before = filters.get('due_before')
            due_after = filters.get('due_after')

            # Convert string dates to datetime objects if provided
            if start_date and isinstance(start_date, str):
                start_date = datetime.fromisoformat(start_date.replace('Z', '+00:00'))
            if end_date and isinstance(end_date, str):
                end_date = datetime.fromisoformat(end_date.replace('Z', '+00:00'))
            if due_before and isinstance(due_before, str):
                due_before = datetime.fromisoformat(due_before.replace('Z', '+00:00'))
            if due_after and isinstance(due_after, str):
                due_after = datetime.fromisoformat(due_after.replace('Z', '+00:00'))

            # Get loans with optional filters
            loans = Loan.get_all_loans(
                customer_id=customer_id,
                account_id=account_id,
                status=status,
                offer_id=offer_id,
                product_id=product_id,
                start_date=start_date,
                end_date=end_date,
                due_before=due_before,
                due_after=due_after
            )

            # Convert loans to dictionary format
            loans_data = []
            for loan in loans:
                loans_data.append({
                    'id': loan.id,
                    'customer_id': loan.customer_id,
                    'account_id': loan.account_id,
                    'offer_id': loan.offer_id,
                    'initial_loan_amount': loan.initial_loan_amount,
                    'current_loan_amount': loan.current_loan_amount,
                    'status': loan.status,
                    'product_id': loan.product_id,
                    'default_penalty_fee': loan.default_penalty_fee,
                    'continuous_fee': loan.continuous_fee,
                    'due_date': loan.due_date.isoformat() if loan.due_date else None,
                    'created_at': loan.created_at.isoformat() if loan.created_at else None,
                    'updated_at': loan.updated_at.isoformat() if loan.updated_at else None
                })

            response_data = {
                'loans': loans_data,
                'count': len(loans_data)
            }

            return response_data

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